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147-554: Elisha Gray (August 2, 1835 – January 21, 1901) was an American electrical engineer who co-founded the Western Electric Manufacturing Company . Gray is best known for his development of a telephone prototype in 1876 in Highland Park, Illinois . Some recent authors have argued that Gray should be considered the true inventor of the telephone because Alexander Graham Bell allegedly stole

294-571: A light pen . The Synclavier from New England Digital was a similar system. Jon Appleton (with Jones and Alonso) invented the Dartmouth Digital Synthesizer, later to become the New England Digital Corp's Synclavier. The Kurzweil K250 , first produced in 1983, was also a successful polyphonic digital music synthesizer, noted for its ability to reproduce several instruments synchronously and having

441-470: A mass-production basis, they opened the door for more compact devices. The first integrated circuits were the hybrid integrated circuit invented by Jack Kilby at Texas Instruments in 1958 and the monolithic integrated circuit chip invented by Robert Noyce at Fairchild Semiconductor in 1959. The MOSFET (metal–oxide–semiconductor field-effect transistor, or MOS transistor) was invented by Mohamed Atalla and Dawon Kahng at BTL in 1959. It

588-470: A paper tape sequencer punched with holes to control pitch sources and filters, similar to a mechanical player piano but capable of generating a wide variety of sounds. The vacuum tube system had to be patched to create timbres. In the 1960s synthesizers were still usually confined to studios due to their size. They were usually modular in design, their stand-alone signal sources and processors connected with patch cords or by other means and controlled by

735-890: A pipe organ for church music, musicians soon discovered that the Hammond was an excellent instrument for blues and jazz ; indeed, an entire genre of music developed built around this instrument, known as the organ trio (typically Hammond organ, drums, and a third instrument, either saxophone or guitar). The first commercially manufactured synthesizer was the Novachord , built by the Hammond Organ Company from 1938 to 1942, which offered 72-note polyphony using 12 oscillators driving monostable -based divide-down circuits, basic envelope control and resonant low-pass filters . The instrument featured 163 vacuum tubes and weighed 500 pounds. The instrument's use of envelope control

882-807: A professional body or an international standards organization. These include the International Electrotechnical Commission (IEC), the National Society of Professional Engineers (NSPE), the Institute of Electrical and Electronics Engineers (IEEE) and the Institution of Engineering and Technology (IET, formerly the IEE). Electrical engineers work in a very wide range of industries and the skills required are likewise variable. These range from circuit theory to

1029-476: A user interface for controlling its sound, often by adjusting the pitch , frequency , or duration of each note . A common user interface is the musical keyboard , which functions similarly to the keyboard on an acoustic piano where the keys are each linked mechanically to swinging string hammers - whereas with an electronic keyboard, the keyboard interface is linked to a synth module , computer or other electronic or digital sound generator, which then creates

1176-660: A variety of topics in electrical engineering . Initially such topics cover most, if not all, of the subdisciplines of electrical engineering. At some schools, the students can then choose to emphasize one or more subdisciplines towards the end of their courses of study. At many schools, electronic engineering is included as part of an electrical award, sometimes explicitly, such as a Bachelor of Engineering (Electrical and Electronic), but in others, electrical and electronic engineering are both considered to be sufficiently broad and complex that separate degrees are offered. Electric instrument An electronic instrument might include

1323-412: A clear distinction between magnetism and static electricity . He is credited with establishing the term "electricity". He also designed the versorium : a device that detects the presence of statically charged objects. In 1762 Swedish professor Johan Wilcke invented a device later named electrophorus that produced a static electric charge. By 1800 Alessandro Volta had developed the voltaic pile ,

1470-573: A common controlling device. Harald Bode , Don Buchla , Hugh Le Caine , Raymond Scott and Paul Ketoff were among the first to build such instruments, in the late 1950s and early 1960s. Buchla later produced a commercial modular synthesizer, the Buchla Music Easel . Robert Moog , who had been a student of Peter Mauzey and one of the RCA Mark II engineers, created a synthesizer that could reasonably be used by musicians, designing

1617-647: A controlling interest in the company shortly after its inception. Gray was born in Barnesville, Ohio , the son of Christiana (Edgerton) and David Gray. His family were Quakers . He was brought up on a farm. He spent several years at Oberlin College where he experimented with electrical devices. Although Gray did not graduate, he taught electricity and science there and built laboratory equipment for its science departments. In 1862, while at Oberlin, Gray met and married Delia Minerva Shepard. In 1865, Gray invented

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1764-526: A degree is usually four or five years and the completed degree may be designated as a Bachelor of Science in Electrical/Electronics Engineering Technology, Bachelor of Engineering , Bachelor of Science, Bachelor of Technology , or Bachelor of Applied Science , depending on the university. The bachelor's degree generally includes units covering physics , mathematics, computer science , project management , and

1911-404: A distance and by the military for sending written commands during gun tests when the deafening noise from the guns made spoken orders on the telephone impractical. The machines were also used at train stations for schedule changes. Gray displayed his telautograph invention in 1893 at the 1893 Columbian Exposition and sold his share in the telautograph shortly after that. Gray was also chairman of

2058-415: A forerunner of the electric battery. In the 19th century, research into the subject started to intensify. Notable developments in this century include the work of Hans Christian Ørsted , who discovered in 1820 that an electric current produces a magnetic field that will deflect a compass needle; of William Sturgeon , who in 1825 invented the electromagnet ; of Joseph Henry and Edward Davy , who invented

2205-643: A general electronic component. The most common microelectronic components are semiconductor transistors , although all main electronic components ( resistors , capacitors etc.) can be created at a microscopic level. Nanoelectronics is the further scaling of devices down to nanometer levels. Modern devices are already in the nanometer regime, with below 100 nm processing having been standard since around 2002. Microelectronic components are created by chemically fabricating wafers of semiconductors such as silicon (at higher frequencies, compound semiconductors like gallium arsenide and indium phosphide) to obtain

2352-565: A group in his own classification system, which is closer to Mahillon than Sachs-Hornbostel. For example, in Galpin's 1937 book A Textbook of European Musical Instruments , he lists electrophones with three second-level divisions for sound generation ("by oscillation", "electro-magnetic", and "electro-static"), as well as third-level and fourth-level categories based on the control method. Present-day ethnomusicologists , such as Margaret Kartomi and Terry Ellingson, suggest that, in keeping with

2499-536: A group of musicians and music merchants met to standardize an interface by which new instruments could communicate control instructions with other instruments and the prevalent microcomputer. This standard was dubbed MIDI ( Musical Instrument Digital Interface ). A paper was authored by Dave Smith of Sequential Circuits and proposed to the Audio Engineering Society in 1981. Then, in August 1983,

2646-459: A huge number of specializations including hardware engineering, power electronics , electromagnetics and waves, microwave engineering , nanotechnology , electrochemistry , renewable energies, mechatronics/control, and electrical materials science. Electrical engineers typically hold a degree in electrical engineering, electronic or electrical and electronic engineering. Practicing engineers may have professional certification and be members of

2793-459: A keyboard instrument of over 700 strings, electrified temporarily to enhance sonic qualities. The clavecin électrique was a keyboard instrument with plectra (picks) activated electrically. However, neither instrument used electricity as a sound source. The first electric synthesizer was invented in 1876 by Elisha Gray . The "Musical Telegraph" was a chance by-product of his telephone technology when Gray discovered that he could control sound from

2940-407: A large number—often millions—of tiny electrical components, mainly transistors , into a small chip around the size of a coin . This allowed for the powerful computers and other electronic devices we see today. Microelectronics engineering deals with the design and microfabrication of very small electronic circuit components for use in an integrated circuit or sometimes for use on their own as

3087-657: A liquid transmitter and asked Bell for proof that the liquid transmitter idea (described in Bell's patent application as using mercury as the liquid) was invented by Bell. Bell pointed to an application of Bell's filed a year earlier where mercury was used in a circuit breaker. The examiner accepted this argument, although mercury would not have worked in a telephone transmitter. On February 29, Bell's lawyer submitted an amendment to Bell's claims that distinguished them from Gray's caveat and Gray's earlier application. On March 3, Wilber approved Bell's application and on March 7, 1876, 174,465

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3234-510: A microprocessor as a controller, was the Sequential Circuits Prophet-5 introduced in late 1977. For the first time, musicians had a practical polyphonic synthesizer that could save all knob settings in computer memory and recall them at the touch of a button. The Prophet-5's design paradigm became a new standard, slowly pushing out more complex and recondite modular designs. In 1935, another significant development

3381-466: A mouthpiece. The sound processing is done on a separate computer. The AlphaSphere is a spherical instrument that consists of 48 tactile pads that respond to pressure as well as touch. Custom software allows the pads to be indefinitely programmed individually or by groups in terms of function, note, and pressure parameter among many other settings. The primary concept of the AlphaSphere is to increase

3528-590: A non-standard scale, Bertrand's Dynaphone could produce octaves and perfect fifths, while the Emicon was an American, keyboard-controlled instrument constructed in 1930 and the German Hellertion combined four instruments to produce chords. Three Russian instruments also appeared, Oubouhof's Croix Sonore (1934), Ivor Darreg 's microtonal 'Electronic Keyboard Oboe' (1937) and the ANS synthesizer , constructed by

3675-524: A novel experience in playing relative to operating a mechanically linked piano keyboard. All electronic musical instruments can be viewed as a subset of audio signal processing applications. Simple electronic musical instruments are sometimes called sound effects ; the border between sound effects and actual musical instruments is often unclear. In the 21st century, electronic musical instruments are now widely used in most styles of music. In popular music styles such as electronic dance music , almost all of

3822-465: A paragraph. Bell testified that he added those seven sentences in the margin of an earlier draft of his application "almost at the last moment before sending it off to Washington" to his lawyers. Bell or his lawyer could not have added the seven sentences to the application after it was filed in the Patent Office, because then the application would not have been suspended. In 1887, Gray invented

3969-411: A primitive fax machine, which he called the "autograph telegraph." The patent drawing includes liquid transmitters. After March 1876, Bell and Watson focused on improving the electromagnetic telephone and never used Gray's liquid transmitter in public demonstrations or commercial use. Although Gray had abandoned his caveat, Gray applied for a patent for the same invention in late 1877. This put him in

4116-505: A profession in the later 19th century. Practitioners had created a global electric telegraph network, and the first professional electrical engineering institutions were founded in the UK and the US to support the new discipline. Francis Ronalds created an electric telegraph system in 1816 and documented his vision of how the world could be transformed by electricity. Over 50 years later, he joined

4263-403: A repeating loop of adjustable length, set to any tempo, and new loops of sound can be layered on top of existing ones. This lends itself to electronic dance-music but is more limited for controlled sequences of notes, as the pad on a regular Kaossilator is featureless. The Eigenharp is a large instrument resembling a bassoon , which can be interacted with through big buttons, a drum sequencer and

4410-458: A second interference with Bell's patents. The Patent Office determined, "while Gray was undoubtedly the first to conceive of and disclose the [variable resistance] invention, as in his caveat of February 14, 1876, his failure to take any action amounting to completion until others had demonstrated the utility of the invention deprives him of the right to have it considered." Gray challenged Bell's patent anyway, and after two years of litigation, Bell

4557-463: A self-adjusting telegraph relay that automatically adapted to varying insulation of the telegraph line. In 1867 Gray received a patent for the invention, the first of more than seventy. In 1869, Elisha Gray and his partner Enos M. Barton founded Gray & Barton Co. in Cleveland, Ohio to supply telegraph equipment to the giant Western Union Telegraph Company . The electrical distribution business

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4704-423: A self-vibrating electromagnetic circuit and so invented a basic oscillator . The Musical Telegraph used steel reeds oscillated by electromagnets and transmitted over a telephone line. Gray also built a simple loudspeaker device into later models, which consisted of a diaphragm vibrating in a magnetic field. A significant invention, which later had a profound effect on electronic music, was the audion in 1906. This

4851-543: A separate triggering signal. This standardization allowed synthesizers from different manufacturers to operate simultaneously. Pitch control was usually performed either with an organ-style keyboard or a music sequencer producing a timed series of control voltages. During the late 1960s hundreds of popular recordings used Moog synthesizers. Other early commercial synthesizer manufacturers included ARP , who also started with modular synthesizers before producing all-in-one instruments, and British firm EMS . In 1970, Moog designed

4998-443: A set of parameters. Xenakis used graph paper and a ruler to aid in calculating the velocity trajectories of glissando for his orchestral composition Metastasis (1953–54), but later turned to the use of computers to compose pieces like ST/4 for string quartet and ST/48 for orchestra (both 1962). The impact of computers continued in 1956. Lejaren Hiller and Leonard Issacson composed Illiac Suite for string quartet ,

5145-620: A showcase for artists who perform or create music with new electronic music instruments, controllers, and synthesizers. In musicology, electronic musical instruments are known as electrophones. Electrophones are the fifth category of musical instrument under the Hornbostel-Sachs system. Musicologists typically only classify music as electrophones if the sound is initially produced by electricity, excluding electronically controlled acoustic instruments such as pipe organs and amplified instruments such as electric guitars . The category

5292-412: A sound. However, it is increasingly common to separate user interface and sound-generating functions into a music controller ( input device ) and a music synthesizer , respectively, with the two devices communicating through a musical performance description language such as MIDI or Open Sound Control . The solid state nature of electronic keyboards also offers differing "feel" and "response", offering

5439-549: A time. Popular monophonic synthesizers include the Moog Minimoog . A few, such as the Moog Sonic Six, ARP Odyssey and EML 101, could produce two different pitches at a time when two keys were pressed. Polyphony (multiple simultaneous tones, which enables chords ) was only obtainable with electronic organ designs at first. Popular electronic keyboards combining organ circuits with synthesizer processing included

5586-431: A two-octave piano keyboard. The "Musical Telegraph" used steel reeds whose oscillations were created by electromagnets and transmitted over a telegraph wire. Gray also built a simple loudspeaker in later models consisting of a vibrating diaphragm in a magnetic field to make the oscillator tones audible and louder at the receiving end. In 1900 Gray worked on an underwater signaling device. After his death in 1901 officials gave

5733-574: A variety of automated electronic-music controllers during the late 1940s and 1950s. In 1959 Daphne Oram produced a novel method of synthesis, her " Oramics " technique, driven by drawings on a 35 mm film strip; it was used for a number of years at the BBC Radiophonic Workshop . This workshop was also responsible for the theme to the TV series Doctor Who a piece, largely created by Delia Derbyshire , that more than any other ensured

5880-426: A variety of industries. Electronic engineering involves the design and testing of electronic circuits that use the properties of components such as resistors , capacitors , inductors , diodes , and transistors to achieve a particular functionality. The tuned circuit , which allows the user of a radio to filter out all but a single station, is just one example of such a circuit. Another example to research

6027-405: A velocity-sensitive keyboard. An important new development was the advent of computers for the purpose of composing music, as opposed to manipulating or creating sounds. Iannis Xenakis began what is called musique stochastique, or stochastic music , which is a method of composing that employs mathematical probability systems. Different probability algorithms were used to create a piece under

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6174-470: Is a pneumatic signal conditioner. Prior to the Second World War, the subject was commonly known as radio engineering and basically was restricted to aspects of communications and radar , commercial radio , and early television . Later, in post-war years, as consumer devices began to be developed, the field grew to include modern television, audio systems, computers, and microprocessors . In

6321-406: Is an electromechanical instrument, as it used both mechanical elements and electronic parts. A Hammond organ used spinning metal tonewheels to produce different sounds. A magnetic pickup similar in design to the pickups in an electric guitar is used to transmit the pitches in the tonewheels to an amplifier and speaker enclosure. While the Hammond organ was designed to be a lower-cost alternative to

6468-444: Is an engineering discipline that deals with the convergence of electrical and mechanical systems. Such combined systems are known as electromechanical systems and have widespread adoption. Examples include automated manufacturing systems , heating, ventilation and air-conditioning systems , and various subsystems of aircraft and automobiles . Electronic systems design is the subject within electrical engineering that deals with

6615-579: Is hotly disputed, although Gray believed that his caveat arrived a few hours before Bell's application. Bell's lawyers in Washington, DC, had been waiting with Bell's patent application for months, under instructions not to file it in the USA until it had been filed in Britain first. (At the time, Britain would only issue patents on discoveries not previously patented elsewhere.) According to Evenson, during

6762-467: Is significant, since this is perhaps the most significant distinction between the modern synthesizer and other electronic instruments. The most commonly used electronic instruments are synthesizers , so-called because they artificially generate sound using a variety of techniques. All early circuit-based synthesis involved the use of analogue circuitry, particularly voltage controlled amplifiers, oscillators and filters. An important technological development

6909-798: Is still important in the design of many control systems . DSP processor ICs are found in many types of modern electronic devices, such as digital television sets , radios, hi-fi audio equipment, mobile phones, multimedia players , camcorders and digital cameras, automobile control systems, noise cancelling headphones, digital spectrum analyzers , missile guidance systems, radar systems, and telematics systems. In such products, DSP may be responsible for noise reduction , speech recognition or synthesis , encoding or decoding digital media, wirelessly transmitting or receiving data, triangulating positions using GPS , and other kinds of image processing , video processing , audio processing , and speech processing . Instrumentation engineering deals with

7056-461: Is their power consumption as this is closely related to their signal strength . Typically, if the power of the transmitted signal is insufficient once the signal arrives at the receiver's antenna(s), the information contained in the signal will be corrupted by noise , specifically static. Control engineering focuses on the modeling of a diverse range of dynamic systems and the design of controllers that will cause these systems to behave in

7203-567: Is very useful for energy transmission as well as for information transmission. These were also the first areas in which electrical engineering was developed. Today, electrical engineering has many subdisciplines, the most common of which are listed below. Although there are electrical engineers who focus exclusively on one of these subdisciplines, many deal with a combination of them. Sometimes, certain fields, such as electronic engineering and computer engineering , are considered disciplines in their own right. Power & Energy engineering deals with

7350-619: The GS-1 and GS-2 , which were costly and heavy. There followed a pair of smaller, preset versions, the CE20 and CE25 Combo Ensembles, targeted primarily at the home organ market and featuring four-octave keyboards. Yamaha's third generation of digital synthesizers was a commercial success; it consisted of the DX7 and DX9 (1983). Both models were compact, reasonably priced, and dependent on custom digital integrated circuits to produce FM tonalities. The DX7

7497-480: The Gray code , which is actually named after 20th century physicist and electrical researcher Frank Gray . Gray wrote several books including: Electrical engineering Electrical engineering is an engineering discipline concerned with the study, design, and application of equipment, devices, and systems that use electricity , electronics , and electromagnetism . It emerged as an identifiable occupation in

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7644-541: The International Congress of Electricians at the World's Columbian Exposition of 1893. Gray conceived of a primitive closed-circuit television system that he called the "telephone". Pictures would be focused on an array of selenium cells and signals from the selenium cells would be transmitted to a distant station on separate wires. At the receiving end, each wire would open or close a shutter to recreate

7791-901: The Minimoog , a non-modular synthesizer with a built-in keyboard. The analogue circuits were interconnected with switches in a simplified arrangement called "normalization." Though less flexible than a modular design, normalization made the instrument more portable and easier to use. The Minimoog sold 12,000 units. Further standardized the design of subsequent synthesizers with its integrated keyboard, pitch and modulation wheels and VCO->VCF->VCA signal flow. It has become celebrated for its "fat" sound—and its tuning problems. Miniaturized solid-state components allowed synthesizers to become self-contained, portable instruments that soon appeared in live performance and quickly became widely used in popular music and electronic art music. Many early analog synthesizers were monophonic, producing only one tone at

7938-536: The Radiohead guitarist Jonny Greenwood . The Trautonium was invented in 1928. It was based on the subharmonic scale, and the resulting sounds were often used to emulate bell or gong sounds, as in the 1950s Bayreuth productions of Parsifal . In 1942, Richard Strauss used it for the bell- and gong-part in the Dresden première of his Japanese Festival Music . This new class of instruments, microtonal by nature,

8085-792: The Z3 , the world's first fully functional and programmable computer using electromechanical parts. In 1943, Tommy Flowers designed and built the Colossus , the world's first fully functional, electronic, digital and programmable computer. In 1946, the ENIAC (Electronic Numerical Integrator and Computer) of John Presper Eckert and John Mauchly followed, beginning the computing era. The arithmetic performance of these machines allowed engineers to develop completely new technologies and achieve new objectives. In 1948, Claude Shannon published "A Mathematical Theory of Communication" which mathematically describes

8232-548: The compression , error detection and error correction of digitally sampled signals. Signal processing is a very mathematically oriented and intensive area forming the core of digital signal processing and it is rapidly expanding with new applications in every field of electrical engineering such as communications, control, radar, audio engineering , broadcast engineering , power electronics, and biomedical engineering as many already existing analog systems are replaced with their digital counterparts. Analog signal processing

8379-658: The doubling of transistors on an IC chip every two years, predicted by Gordon Moore in 1965. Silicon-gate MOS technology was developed by Federico Faggin at Fairchild in 1968. Since then, the MOSFET has been the basic building block of modern electronics. The mass-production of silicon MOSFETs and MOS integrated circuit chips, along with continuous MOSFET scaling miniaturization at an exponential pace (as predicted by Moore's law ), has since led to revolutionary changes in technology, economy, culture and thinking. The Apollo program which culminated in landing astronauts on

8526-569: The electric guitar remain in the chordophones category, and so on. In the 18th-century, musicians and composers adapted a number of acoustic instruments to exploit the novelty of electricity. Thus, in the broadest sense, the first electrified musical instrument was the Denis d'or keyboard, dating from 1753, followed shortly by the clavecin électrique by the Frenchman Jean-Baptiste de Laborde in 1761. The Denis d'or consisted of

8673-520: The electrical relay in 1835; of Georg Ohm , who in 1827 quantified the relationship between the electric current and potential difference in a conductor ; of Michael Faraday , the discoverer of electromagnetic induction in 1831; and of James Clerk Maxwell , who in 1873 published a unified theory of electricity and magnetism in his treatise Electricity and Magnetism . In 1782, Georges-Louis Le Sage developed and presented in Berlin probably

8820-452: The generation , transmission , and distribution of electricity as well as the design of a range of related devices. These include transformers , electric generators , electric motors , high voltage engineering, and power electronics . In many regions of the world, governments maintain an electrical network called a power grid that connects a variety of generators together with users of their energy. Users purchase electrical energy from

8967-539: The telautograph , a device that could remotely transmit handwriting through telegraph systems. Gray was granted several patents for these pioneer fax machines, and the Gray National Telautograph Company was chartered in 1888 and continued in business as The Telautograph Corporation for many years; after a series of mergers it was finally absorbed by Xerox in the 1990s. Gray's telautograph machines were used by banks for signing documents at

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9114-448: The transmission of information across a communication channel such as a coax cable , optical fiber or free space . Transmissions across free space require information to be encoded in a carrier signal to shift the information to a carrier frequency suitable for transmission; this is known as modulation . Popular analog modulation techniques include amplitude modulation and frequency modulation . The choice of modulation affects

9261-429: The 1850s had shown the relationship of different forms of electromagnetic radiation including the possibility of invisible airborne waves (later called "radio waves"). In his classic physics experiments of 1888, Heinrich Hertz proved Maxwell's theory by transmitting radio waves with a spark-gap transmitter , and detected them by using simple electrical devices. Other physicists experimented with these new waves and in

9408-406: The 1950s in the context of computer music , including computer- played music (software sequencer), computer- composed music ( music synthesis ), and computer sound generation ( sound synthesis ). The first digital synthesizers were academic experiments in sound synthesis using digital computers. FM synthesis was developed for this purpose; as a way of generating complex sounds digitally with

9555-592: The 1950s. The Mark II Music Synthesizer , housed at the Columbia-Princeton Electronic Music Center in New York City . Designed by Herbert Belar and Harry Olson at RCA, with contributions from Vladimir Ussachevsky and Peter Mauzey , it was installed at Columbia University in 1957. Consisting of a room-sized array of interconnected sound synthesis components, it was only capable of producing music by programming, using

9702-682: The ARP Omni and Moog's Polymoog and Opus 3. By 1976 affordable polyphonic synthesizers began to appear, such as the Yamaha CS-50, CS-60 and CS-80 , the Sequential Circuits Prophet-5 and the Oberheim Four-Voice. These remained complex, heavy and relatively costly. The recording of settings in digital memory allowed storage and recall of sounds. The first practical polyphonic synth, and the first to use

9849-502: The Library of Congress in 1976. Although Bell has been accused of stealing the telephone from Gray because his liquid transmitter design resembled Gray's, documents in the Library of Congress indicate that Bell had been using liquid transmitters extensively for three years in his multiple telegraph and other experiments. In April, 1875, ten months before the alleged theft of Gray's design, the U.S. Patent Office granted 161,739 to Bell for

9996-715: The MIDI Specification 1.0 was finalized. The advent of MIDI technology allows a single keystroke, control wheel motion, pedal movement, or command from a microcomputer to activate every device in the studio remotely and in synchrony, with each device responding according to conditions predetermined by the composer. MIDI instruments and software made powerful control of sophisticated instruments easily affordable by many studios and individuals. Acoustic sounds became reintegrated into studios via sampling and sampled-ROM-based instruments. The increasing power and decreasing cost of sound-generating electronics (and especially of

10143-661: The Moon with Apollo 11 in 1969 was enabled by NASA 's adoption of advances in semiconductor electronic technology , including MOSFETs in the Interplanetary Monitoring Platform (IMP) and silicon integrated circuit chips in the Apollo Guidance Computer (AGC). The development of MOS integrated circuit technology in the 1960s led to the invention of the microprocessor in the early 1970s. The first single-chip microprocessor

10290-580: The Royal Academy of Natural Sciences and Arts of Barcelona. Salva's electrolyte telegraph system was very innovative though it was greatly influenced by and based upon two discoveries made in Europe in 1800—Alessandro Volta's electric battery for generating an electric current and William Nicholson and Anthony Carlyle's electrolysis of water. Electrical telegraphy may be considered the first example of electrical engineering. Electrical engineering became

10437-579: The Russian scientist Evgeny Murzin from 1937 to 1958. Only two models of this latter were built and the only surviving example is currently stored at the Lomonosov University in Moscow . It has been used in many Russian movies—like Solaris —to produce unusual, "cosmic" sounds. Hugh Le Caine , John Hanert, Raymond Scott , composer Percy Grainger (with Burnett Cross), and others built

10584-533: The US Patent Office. A caveat was like a provisional patent application with drawings and description but without a request for examination. On Monday morning February 14, 1876, Gray signed and had notarized the caveat that described a telephone that used a liquid transmitter. Baldwin then submitted the caveat to the US Patent Office. That same morning a lawyer for Alexander Graham Bell submitted Bell's patent application. Which application arrived first

10731-505: The amplifier tube, called the triode . In 1920, Albert Hull developed the magnetron which would eventually lead to the development of the microwave oven in 1946 by Percy Spencer . In 1934, the British military began to make strides toward radar (which also uses the magnetron) under the direction of Dr Wimperis, culminating in the operation of the first radar station at Bawdsey in August 1936. In 1941, Konrad Zuse presented

10878-815: The applications of computer engineering. Photonics and optics deals with the generation, transmission, amplification, modulation, detection, and analysis of electromagnetic radiation . The application of optics deals with design of optical instruments such as lenses , microscopes , telescopes , and other equipment that uses the properties of electromagnetic radiation. Other prominent applications of optics include electro-optical sensors and measurement systems, lasers , fiber-optic communication systems, and optical disc systems (e.g. CD and DVD). Photonics builds heavily on optical technology, supplemented with modern developments such as optoelectronics (mostly involving semiconductors ), laser systems, optical amplifiers and novel materials (e.g. metamaterials ). Mechatronics

11025-417: The circuits while he was at Columbia-Princeton. The Moog synthesizer was first displayed at the Audio Engineering Society convention in 1964. It required experience to set up sounds but was smaller and more intuitive than what had come before, less like a machine and more like a musical instrument. Moog established standards for control interfacing, using a logarithmic 1-volt-per-octave for pitch control and

11172-413: The cost and performance of a system and these two factors must be balanced carefully by the engineer. Once the transmission characteristics of a system are determined, telecommunication engineers design the transmitters and receivers needed for such systems. These two are sometimes combined to form a two-way communication device known as a transceiver . A key consideration in the design of transmitters

11319-528: The cubes, a variety of music and sound software can be operated. AudioCubes have applications in sound design, music production, DJing and live performance. The Kaossilator and Kaossilator Pro are compact instruments where the position of a finger on the touch pad controls two note-characteristics; usually the pitch is changed with a left-right motion and the tonal property, filter or other parameter changes with an up-down motion. The touch pad can be set to different musical scales and keys. The instrument can record

11466-519: The curvature of the Earth. Marconi later transmitted the wireless signals across the Atlantic between Poldhu, Cornwall , and St. John's, Newfoundland , a distance of 2,100 miles (3,400 km). Millimetre wave communication was first investigated by Jagadish Chandra Bose during 1894–1896, when he reached an extremely high frequency of up to 60   GHz in his experiments. He also introduced

11613-500: The design of devices to measure physical quantities such as pressure , flow , and temperature. The design of such instruments requires a good understanding of physics that often extends beyond electromagnetic theory . For example, flight instruments measure variables such as wind speed and altitude to enable pilots the control of aircraft analytically. Similarly, thermocouples use the Peltier-Seebeck effect to measure

11760-561: The design of new hardware . Computer engineers may also work on a system's software. However, the design of complex software systems is often the domain of software engineering, which is usually considered a separate discipline. Desktop computers represent a tiny fraction of the devices a computer engineer might work on, as computer-like architectures are now found in a range of embedded devices including video game consoles and DVD players . Computer engineers are involved in many hardware and software aspects of computing. Robots are one of

11907-577: The desired manner. To implement such controllers, electronics control engineers may use electronic circuits , digital signal processors , microcontrollers , and programmable logic controllers (PLCs). Control engineering has a wide range of applications from the flight and propulsion systems of commercial airliners to the cruise control present in many modern automobiles . It also plays an important role in industrial automation . Control engineers often use feedback when designing control systems . For example, in an automobile with cruise control

12054-420: The desired transport of electronic charge and control of current. The field of microelectronics involves a significant amount of chemistry and material science and requires the electronic engineer working in the field to have a very good working knowledge of the effects of quantum mechanics . Signal processing deals with the analysis and manipulation of signals . Signals can be either analog , in which case

12201-468: The draft as a finished patent application, Bell's lawyer hand-delivered the finished application to the patent office just before noon Monday, a few hours after Gray's caveat was delivered by Gray's lawyer. Bell's lawyer requested that Bell's application be immediately recorded and hand-delivered to the examiner on Monday so that later Bell could claim it had arrived first. Bell was in Boston at this time and

12348-445: The early 1960s. During the 1940s–1960s, Raymond Scott , an American composer of electronic music, invented various kind of music sequencers for his electric compositions. Step sequencers played rigid patterns of notes using a grid of (usually) 16 buttons, or steps, each step being 1/16 of a measure . These patterns of notes were then chained together to form longer compositions. Software sequencers were continuously utilized since

12495-414: The expressiveness of the cello . The French composer Olivier Messiaen used the ondes Martenot in pieces such as his 1949 symphony Turangalîla-Symphonie , and his sister-in-law Jeanne Loriod was a celebrated player. It appears in numerous film and television soundtracks, particularly science fiction and horror films . Contemporary users of the ondes Martenot include Tom Waits , Daft Punk and

12642-570: The first Department of Electrical Engineering in the United States. In the same year, University College London founded the first chair of electrical engineering in Great Britain. Professor Mendell P. Weinbach at University of Missouri established the electrical engineering department in 1886. Afterwards, universities and institutes of technology gradually started to offer electrical engineering programs to their students all over

12789-781: The first complete work of computer-assisted composition using algorithmic composition. In 1957, Max Mathews at Bell Lab wrote MUSIC-N series, a first computer program family for generating digital audio waveforms through direct synthesis. Then Barry Vercoe wrote MUSIC 11 based on MUSIC IV-BF , a next-generation music synthesis program (later evolving into csound , which is still widely used). In mid 80s, Miller Puckette at IRCAM developed graphic signal-processing software for 4X called Max (after Max Mathews), and later ported it to Macintosh (with Dave Zicarelli extending it for Opcode ) for real-time MIDI control, bringing algorithmic composition availability to most composers with modest computer programming background. In 1980,

12936-492: The first compositions for electronic instruments, as opposed to noisemakers and re-purposed machines. The Theremin was notable for being the first musical instrument played without touching it. In 1929, Joseph Schillinger composed First Airphonic Suite for Theremin and Orchestra , premièred with the Cleveland Orchestra with Leon Theremin as soloist. The next year Henry Cowell commissioned Theremin to create

13083-584: The first electronic rhythm machine, called the Rhythmicon . Cowell wrote some compositions for it, which he and Schillinger premiered in 1932. The ondes Martenot is played with a keyboard or by moving a ring along a wire, creating "wavering" sounds similar to a theremin . It was invented in 1928 by the French cellist Maurice Martenot , who was inspired by the accidental overlaps of tones between military radio oscillators, and wanted to create an instrument with

13230-528: The first polyphonic digital sampler , was the harbinger of sample-based synthesizers. Designed in 1978 by Peter Vogel and Kim Ryrie and based on a dual microprocessor computer designed by Tony Furse in Sydney, Australia, the Fairlight CMI gave musicians the ability to modify volume, attack, decay, and use special effects like vibrato. Sample waveforms could be displayed on-screen and modified using

13377-479: The first weighing seven tons, the last in excess of 200 tons. Portability was managed only by rail and with the use of thirty boxcars. By 1912, public interest had waned, and Cahill's enterprise was bankrupt. Another development, which aroused the interest of many composers, occurred in 1919–1920. In Leningrad, Leon Theremin built and demonstrated his Etherophone, which was later renamed the Theremin . This led to

13524-583: The future it is hoped the devices will help build tiny implantable medical devices and improve optical communication . In aerospace engineering and robotics , an example is the most recent electric propulsion and ion propulsion. Electrical engineers typically possess an academic degree with a major in electrical engineering, electronics engineering , electrical engineering technology , or electrical and electronic engineering. The same fundamental principles are taught in all programs, though emphasis may vary according to title. The length of study for such

13671-533: The grid, avoiding the costly exercise of having to generate their own. Power engineers may work on the design and maintenance of the power grid as well as the power systems that connect to it. Such systems are called on-grid power systems and may supply the grid with additional power, draw power from the grid, or do both. Power engineers may also work on systems that do not connect to the grid, called off-grid power systems, which in some cases are preferable to on-grid systems. Telecommunications engineering focuses on

13818-710: The guitar-like SynthAxe , the BodySynth, the Buchla Thunder , the Continuum Fingerboard , the Roland Octapad , various isomorphic keyboards including the Thummer, and Kaossilator Pro , and kits like I-CubeX . The Reactable is a round translucent table with a backlit interactive display. By placing and manipulating blocks called tangibles on the table surface, while interacting with

13965-408: The idea of the liquid transmitter from him. Although Gray had been using liquid transmitters in his telephone experiments for more than two years previously , Bell's telephone patent was upheld in numerous court decisions. Gray is also considered to be the father of the modern music synthesizer , and was granted over 70 patents for his inventions. He was one of the founders of Graybar , purchasing

14112-462: The image. In 1899, Gray moved to Boston where he continued inventing. One of his projects was to develop an underwater signaling device to transmit messages to ships. One such signaling device was tested on December 31, 1900. Three weeks later, on January 21, 1901, Gray died from a heart attack in Newtonville, Massachusetts . Some modern authors incorrectly credit Elisha Gray as the namesake of

14259-523: The instrument sounds used in recordings are electronic instruments (e.g., bass synth , synthesizer , drum machine ). Development of new electronic musical instruments, controllers, and synthesizers continues to be a highly active and interdisciplinary field of research. Specialized conferences, such as the International Conference on New Interfaces for Musical Expression , have organized to report cutting-edge work, as well as to provide

14406-534: The intensity of the electric current without breaking the circuit, which seemed to the examiner to be an "undulatory current" that Bell was claiming. Such an interference would delay Bell's application until Bell submitted proof, under the first to invent rules, that Bell had invented that feature before Gray. Bell's lawyer telegraphed Bell, who was still in Boston, to come to Washington, DC. When Bell arrived on February 26, Bell visited his lawyers and then visited examiner Wilber who told Bell that Gray's caveat showed

14553-458: The international standardization of the units volt , ampere , coulomb , ohm , farad , and henry . This was achieved at an international conference in Chicago in 1893. The publication of these standards formed the basis of future advances in standardization in various industries, and in many countries, the definitions were immediately recognized in relevant legislation. During these years,

14700-443: The invention to Oberlin College. A few years later he was recognized as the inventor of the underwater signaling device. On July 27, 1875, Gray was granted U.S. patent 166,095 for "Electric Telegraph for Transmitting Musical Tones" ( acoustic telegraphy ). His experiments with transmitting musical tones went further, and on February 15, 1876 Elisha Gray was granted US Patent for electro-harmonic telegraph with piano keyboard. He

14847-585: The late 1970s and early 1980s, do-it-yourself designs were published in hobby electronics magazines (such the Formant modular synth, a DIY clone of the Moog system, published by Elektor ) and kits were supplied by companies such as Paia in the US, and Maplin Electronics in the UK. In 1966, Reed Ghazala discovered and began to teach math " circuit bending "—the application of the creative short circuit,

14994-556: The latter half of the 19th century after the commercialization of the electric telegraph , the telephone, and electrical power generation, distribution, and use. Electrical engineering is divided into a wide range of different fields, including computer engineering , systems engineering , power engineering , telecommunications , radio-frequency engineering , signal processing , instrumentation , photovoltaic cells , electronics , and optics and photonics . Many of these disciplines overlap with other engineering branches, spanning

15141-487: The level of expression available to electronic musicians, by allowing for the playing style of a musical instrument. Chiptune , chipmusic, or chip music is music written in sound formats where many of the sound textures are synthesized or sequenced in real time by a computer or video game console sound chip , sometimes including sample-based synthesis and low bit sample playback. Many chip music devices featured synthesizers in tandem with low rate sample playback. During

15288-399: The management skills of a project manager . The tools and equipment that an individual engineer may need are similarly variable, ranging from a simple voltmeter to sophisticated design and manufacturing software. Electricity has been a subject of scientific interest since at least the early 17th century. William Gilbert was a prominent early electrical scientist, and was the first to draw

15435-446: The mid-to-late 1950s, the term radio engineering gradually gave way to the name electronic engineering . Before the invention of the integrated circuit in 1959, electronic circuits were constructed from discrete components that could be manipulated by humans. These discrete circuits consumed much space and power and were limited in speed, although they are still common in some applications. By contrast, integrated circuits packed

15582-511: The multi-disciplinary design issues of complex electrical and mechanical systems. The term mechatronics is typically used to refer to macroscopic systems but futurists have predicted the emergence of very small electromechanical devices. Already, such small devices, known as microelectromechanical systems (MEMS), are used in automobiles to tell airbags when to deploy, in digital projectors to create sharper images, and in inkjet printers to create nozzles for high definition printing. In

15729-556: The name to Western Electric Manufacturing Company of Chicago . Gray continued to invent for Western Electric. In 1874, Gray retired to do independent research and development. Gray applied for a patent on a harmonic telegraph which consisted of multi-tone transmitters, that controlled each tone with a separate telegraph key. Gray gave several private demonstrations of this invention in New York and Washington, D.C. in May and June 1874. Gray

15876-519: The new Society of Telegraph Engineers (soon to be renamed the Institution of Electrical Engineers ) where he was regarded by other members as the first of their cohort. By the end of the 19th century, the world had been forever changed by the rapid communication made possible by the engineering development of land-lines, submarine cables , and, from about 1890, wireless telegraphy . Practical applications and advances in such fields created an increasing need for standardized units of measure . They led to

16023-525: The passage of information with uncertainty ( electrical noise ). The first working transistor was a point-contact transistor invented by John Bardeen and Walter Houser Brattain while working under William Shockley at the Bell Telephone Laboratories (BTL) in 1947. They then invented the bipolar junction transistor in 1948. While early junction transistors were relatively bulky devices that were difficult to manufacture on

16170-541: The patent in general terms, although in a letter to Gray, Bell admitted that he learned some of the technical details. Wilber's affidavit contradicted his earlier testimony, and historians have pointed out that his last affidavit was drafted for him by the attorneys for the Pan-Electric Company which was attempting to steal the Bell patents and was later discovered to have bribed the U.S. Attorney General Augustus Garland and several Congressmen. Bell's patent

16317-453: The personal computer), combined with the standardization of the MIDI and Open Sound Control musical performance description languages, has facilitated the separation of musical instruments into music controllers and music synthesizers. By far the most common musical controller is the musical keyboard . Other controllers include the radiodrum , Akai's EWI and Yamaha's WX wind controllers,

16464-683: The popularity of electronic music in the UK. In 1897 Thaddeus Cahill patented an instrument called the Telharmonium (or Teleharmonium, also known as the Dynamaphone). Using tonewheels to generate musical sounds as electrical signals by additive synthesis , it was capable of producing any combination of notes and overtones, at any dynamic level. This technology was later used to design the Hammond organ . Between 1901 and 1910 Cahill had three progressively larger and more complex versions made,

16611-401: The process developed devices for transmitting and detecting them. In 1895, Guglielmo Marconi began work on a way to adapt the known methods of transmitting and detecting these "Hertzian waves" into a purpose-built commercial wireless telegraphic system. Early on, he sent wireless signals over a distance of one and a half miles. In December 1901, he sent wireless waves that were not affected by

16758-425: The signal varies continuously according to the information, or digital , in which case the signal varies according to a series of discrete values representing the information. For analog signals, signal processing may involve the amplification and filtering of audio signals for audio equipment or the modulation and demodulation of signals for telecommunications. For digital signals, signal processing may involve

16905-473: The smallest number of computational operations per sound sample. In 1983 Yamaha introduced the first stand-alone digital synthesizer, the DX-7 . It used frequency modulation synthesis (FM synthesis), first developed by John Chowning at Stanford University during the late sixties. Chowning exclusively licensed his FM synthesis patent to Yamaha in 1975. Yamaha subsequently released their first FM synthesizers,

17052-417: The spirit of the original Hornbostel Sachs classification scheme, if one categorizes instruments by what first produces the initial sound in the instrument, that only subcategory 53 should remain in the electrophones category. Thus, it has been more recently proposed, for example, that the pipe organ (even if it uses electric key action to control solenoid valves ) remain in the aerophones category, and that

17199-411: The study of electricity was largely considered to be a subfield of physics since early electrical technology was considered electromechanical in nature. The Technische Universität Darmstadt founded the world's first department of electrical engineering in 1882 and introduced the first-degree course in electrical engineering in 1883. The first electrical engineering degree program in the United States

17346-439: The success of FM synthesis Yamaha signed a contract with Stanford University in 1989 to develop digital waveguide synthesis , leading to the first commercial physical modeling synthesizer , Yamaha's VL-1, in 1994. The DX-7 was affordable enough for amateurs and young bands to buy, unlike the costly synthesizers of previous generations, which were mainly used by top professionals. The Fairlight CMI (Computer Musical Instrument),

17493-612: The tape recorder as an essential element: "electronically produced sounds recorded on tape and arranged by the composer to form a musical composition". It was also indispensable to Musique concrète . Tape also gave rise to the first, analogue, sample-playback keyboards, the Chamberlin and its more famous successor the Mellotron , an electro-mechanical, polyphonic keyboard originally developed and built in Birmingham, England in

17640-406: The telegraph industry. Gray's inventions and patent costs were financed by a dentist, Dr. Samuel S. White of Philadelphia, who had made a fortune producing porcelain teeth. White wanted Gray to focus on the acoustic telegraph which promised huge profits instead of what appeared to be unpromising competing inventions such as the telephone. White made the decision in 1876 to redirect Gray's interest in

17787-597: The telephone. In 1870, Gray developed a needle annunciator for hotels and another for elevators. He also developed a microphone printer which had a typewriter keyboard and printed messages on paper tape. In 1871 the Great Chicago Fire destroyed the city and its telegraph infrastructure, Gray & Barton was hired to rebuild it. In 1872, Western Union , then financed by the Vanderbilts and J. P. Morgan , bought one-third of Gray and Barton Co. and changed

17934-444: The temperature difference between two points. Often instrumentation is not used by itself, but instead as the sensors of larger electrical systems. For example, a thermocouple might be used to help ensure a furnace's temperature remains constant. For this reason, instrumentation engineering is often viewed as the counterpart of control. Computer engineering deals with the design of computers and computer systems . This may involve

18081-478: The theoretical basis of alternating current engineering. The spread in the use of AC set off in the United States what has been called the war of the currents between a George Westinghouse backed AC system and a Thomas Edison backed DC power system, with AC being adopted as the overall standard. During the development of radio , many scientists and inventors contributed to radio technology and electronics. The mathematical work of James Clerk Maxwell during

18228-424: The use of semiconductor junctions to detect radio waves, when he patented the radio crystal detector in 1901. In 1897, Karl Ferdinand Braun introduced the cathode-ray tube as part of an oscilloscope , a crucial enabling technology for electronic television . John Fleming invented the first radio tube, the diode , in 1904. Two years later, Robert von Lieben and Lee De Forest independently developed

18375-557: The use of transformers , developed rapidly in the 1880s and 1890s with transformer designs by Károly Zipernowsky , Ottó Bláthy and Miksa Déri (later called ZBD transformers), Lucien Gaulard , John Dixon Gibbs and William Stanley Jr. Practical AC motor designs including induction motors were independently invented by Galileo Ferraris and Nikola Tesla and further developed into a practical three-phase form by Mikhail Dolivo-Dobrovolsky and Charles Eugene Lancelot Brown . Charles Steinmetz and Oliver Heaviside contributed to

18522-485: The vehicle's speed is continuously monitored and fed back to the system which adjusts the motor's power output accordingly. Where there is regular feedback, control theory can be used to determine how the system responds to such feedback. Control engineers also work in robotics to design autonomous systems using control algorithms which interpret sensory feedback to control actuators that move robots such as autonomous vehicles , autonomous drones and others used in

18669-432: The visual display via finger gestures, a virtual modular synthesizer is operated, creating music or sound effects. AudioCubes are autonomous wireless cubes powered by an internal computer system and rechargeable battery. They have internal RGB lighting, and are capable of detecting each other's location, orientation and distance. The cubes can also detect distances to the user's hands and fingers. Through interaction with

18816-457: The weekend of February 12–14, 1876, before either caveat or application had been filed in the patent office, Bell's lawyer learned about the liquid transmitter idea in Gray's caveat that would be filed early Monday morning February 14. Bell's lawyer then added seven sentences describing the liquid transmitter and a variable resistance claim to Bell's draft application. After the lawyer's clerk recopied

18963-414: The world's first form of electric telegraphy , using 24 different wires, one for each letter of the alphabet. This telegraph connected two rooms. It was an electrostatic telegraph that moved gold leaf through electrical conduction. In 1795, Francisco Salva Campillo proposed an electrostatic telegraph system. Between 1803 and 1804, he worked on electrical telegraphy, and in 1804, he presented his report at

19110-560: The world. During these decades the use of electrical engineering increased dramatically. In 1882, Thomas Edison switched on the world's first large-scale electric power network that provided 110 volts— direct current (DC)—to 59 customers on Manhattan Island in New York City. In 1884, Sir Charles Parsons invented the steam turbine allowing for more efficient electric power generation. Alternating current , with its ability to transmit power more efficiently over long distances via

19257-581: Was a charter member of the Presbyterian Church in Highland Park, Illinois . At the church, on December 29, 1874, Gray gave the first public demonstration of his invention for transmitting musical tones and transmitted "familiar melodies through telegraph wire" according to a newspaper announcement. This was one of the earliest electric musical instruments using vibrating electromagnetic circuits that were single-note oscillators operated by

19404-432: Was added to the Hornbostel-Sachs musical instrument classification system by Sachs in 1940, in his 1940 book The History of Musical Instruments ; the original 1914 version of the system did not include it. Sachs divided electrophones into three subcategories: The last category included instruments such as theremins or synthesizers , which he called radioelectric instruments. Francis William Galpin provided such

19551-523: Was awarded rights to the invention, and as a result, Bell is credited as the inventor. In 1886, Wilber stated in an affidavit that he was an alcoholic and deeply in debt to Bell's lawyer Marcellus Bailey with whom Wilber had served in the Civil War. Wilber stated that, contrary to Patent Office rules, he showed Bailey the caveat Gray had filed. He also stated that he showed the caveat to Bell and Bell gave him $ 100. Bell testified that they only discussed

19698-402: Was disputed in 1888 by attorney Lysander Hill who accused Wilber of allowing Bell or his lawyer Pollok to add a handwritten margin note of seven sentences to Bell's application that describe an alternate design similar to Gray's liquid microphone design. However, the marginal note was added only to Bell's earlier draft, not to his patent application that shows the seven sentences already present in

19845-518: Was elected as a member to the American Philosophical Society in 1878. On July 31, 1888, Gray patented the telautograph , an analog precursor to the modern fax machine. Gray's patent stated that the telautograph would allow "one to transmit his own handwriting to a distant point over a two-wire circuit." It was the first facsimile machine in which the stylus was controlled by horizontal and vertical bars. The telautograph

19992-422: Was first publicly exhibited at the 1893 World's Columbian Exposition held in Chicago . Because of Samuel White's opposition to Gray working on the telephone, Gray did not tell anybody about his invention for transmitting voice sounds until February 11, 1876 (Friday). The only remaining proof is a drawing he made on that day. Gray requested that his patent lawyer William D. Baldwin prepare a "caveat" for filing at

20139-649: Was later spun off and organized into a separate company, Graybar Electric Company , Inc. Barton was employed by Western Union to examine and test new products. In 1870, financing for Gray & Barton Co. was arranged by General Anson Stager , a superintendent of the Western Union Telegraph Company. Stager became an active partner in Gray & Barton Co. and remained on the board of directors. The company moved to Chicago near Highland Park . Gray later gave up his administrative position as chief engineer to focus on inventions that could benefit

20286-517: Was made in Germany. Allgemeine Elektricitäts Gesellschaft (AEG) demonstrated the first commercially produced magnetic tape recorder , called the Magnetophon . Audio tape , which had the advantage of being fairly light as well as having good audio fidelity, ultimately replaced the bulkier wire recorders. The term " electronic music " (which first came into use during the 1930s) came to include

20433-534: Was not aware that his application had been filed. Five days later, on February 19, Zenas Fisk Wilber, the patent examiner for both Bell's application and Gray's caveat, noticed that Bell's application claimed the same variable resistance feature described in Gray's caveat. Wilber suspended Bell's application for 90 days to give Gray time to submit a competing patent application. The suspension also gave Bell time to amend his claims to avoid an interference with an earlier patent application of Gray's that mentioned changing

20580-499: Was only adopted slowly by composers at first, but by the early 1930s there was a burst of new works incorporating these and other electronic instruments. In 1929 Laurens Hammond established his company for the manufacture of electronic instruments. He went on to produce the Hammond organ , which was based on the principles of the Telharmonium , along with other developments including early reverberation units. The Hammond organ

20727-450: Was published by the U.S. Patent Office . Bell returned to Boston and resumed work on March 9, drawing a diagram in his lab notebook of a water transmitter being used face down, very similar to that shown in Gray's caveat. Bell and Watson built and tested a liquid transmitter design on March 10 and successfully transmitted clear speech saying "Mr. Watson – come here – I want to see you." Bell's notebooks became public when they were donated to

20874-489: Was started at Massachusetts Institute of Technology (MIT) in the physics department under Professor Charles Cross, though it was Cornell University to produce the world's first electrical engineering graduates in 1885. The first course in electrical engineering was taught in 1883 in Cornell's Sibley College of Mechanical Engineering and Mechanic Arts . In about 1885, Cornell President Andrew Dickson White established

21021-458: Was the Intel 4004 , released in 1971. The Intel 4004 was designed and realized by Federico Faggin at Intel with his silicon-gate MOS technology, along with Intel's Marcian Hoff and Stanley Mazor and Busicom's Masatoshi Shima. The microprocessor led to the development of microcomputers and personal computers, and the microcomputer revolution . One of the properties of electricity is that it

21168-400: Was the first mass market all-digital synthesizer. It became indispensable to many music artists of the 1980s, and demand soon exceeded supply. The DX7 sold over 200,000 units within three years. The DX series was not easy to program but offered a detailed, percussive sound that led to the demise of the electro-mechanical Rhodes piano , which was heavier and larger than a DX synth. Following

21315-490: Was the first thermionic valve, or vacuum tube and which led to the generation and amplification of electrical signals, radio broadcasting, and electronic computation, among other things. Other early synthesizers included the Telharmonium (1897), the Theremin (1919), Jörg Mager's Spharophon (1924) and Partiturophone, Taubmann's similar Electronde (1933), Maurice Martenot 's ondes Martenot ("Martenot waves", 1928), Trautwein's Trautonium (1930). The Mellertion (1933) used

21462-474: Was the first truly compact transistor that could be miniaturised and mass-produced for a wide range of uses. It revolutionized the electronics industry , becoming the most widely used electronic device in the world. The MOSFET made it possible to build high-density integrated circuit chips. The earliest experimental MOS IC chip to be fabricated was built by Fred Heiman and Steven Hofstein at RCA Laboratories in 1962. MOS technology enabled Moore's law ,

21609-598: Was the invention of the Clavivox synthesizer in 1956 by Raymond Scott with subassembly by Robert Moog . French composer and engineer Edgard Varèse created a variety of compositions using electronic horns , whistles, and tape. Most notably, he wrote Poème électronique for the Philips pavilion at the Brussels World Fair in 1958. RCA produced experimental devices to synthesize voice and music in

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