History of sound recording

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Experiments in capturing sound on a recording medium for preservation and reproduction began in earnest during the Industrial Revolution of the 1800s. Many pioneering attempts to record and reproduce sound were made during the latter half of the 19th century – notably de Martinville's Phonautograph of 1857 – and these efforts culminated in the invention of the phonograph, patented by Thomas Edison in 1877.

The history of sound recording - which has progressed in waves, driven by the invention and commercial introduction of new technologies - can be roughly divided into four main periods:

  • the "Acoustic" era, 1877 to 1925
  • the "Electrical" era, 1925 to 1945 (including sound on film)
  • the "Magnetic" era, 1945 to 1975
  • the "Digital" Era, 1975 to the present day.

Overview[edit]

The acoustic era (1877 to 1925)[edit]

The earliest practical recording technologies were entirely mechanical devices. These recorders typically used a large conical horn to collect and focus the physical air pressure of the sound waves produced by the human voice or musical instruments. A sensitive membrane or diaphragm, located at the apex of the cone, was connected to an articulated scriber or stylus, and as the changing air pressure moved the diaphragm back and forth, the stylus scratched or incised an analogue of the sound waves onto a moving recording medium, such as a roll of coated paper, or a cylinder or disc coated with a soft material such as wax or a soft metal. These early recordings were necessarily of low fidelity and volume, and captured only a narrow segment of the audible sound spectrum - typically only from around 250 Hz up to about 2,500 Hz - so musicians and engineers were forced to adapt to these sonic limitations. Bands of the period often favored louder instruments such as trumpet, cornet and trombone, lower-register brass instruments (such the tuba and the euphonium) replaced the string bass, and blocks of wood stood in for bass drums; performers also had to arrange themselves strategically around the horn to balance the sound, and to play as loudly as possible. The reproduction of domestic phonographs was similarly limited in both frequency-range and volume - this period gave rise to the expression "put a sock in it", which commemorates the common practice of placing a sock in the horn of the phonograph to muffle the sound for quieter listening. By the end of the acoustic era, the disc had become the standard medium for sound recording, and its dominance in the domestic audio market lasted until the end of the 20th century.

The electrical era (1925 to 1945) (including sound on film)[edit]

The 'second wave' of sound recording history was ushered in by the introduction of Western Electric's integrated system of electrical microphones, electronic signal amplifiers and electrical disc-cutting machines, which was adopted by major US record labels in 1925. Sound recording now became a hybrid process - sound could now be captured, amplified, filtered and balanced electronically, and the disc-cutting head was now electrically-driven, but the actual recording process remained essentially mechanical – the signal was still physically inscribed into a metal or wax 'master' disc, and consumer discs were mass-produced mechanically by stamping an impression of the master disc onto a suitable medium, originally shellac and later polyvinyl plastic. The Westrex system greatly improved the fidelity of sound recording, increasing the reproducible frequency rage to a much wider band (between 600 Hz and 6000 Hz) and allowing a new class of professional – the audio engineer – to capture a fuller, richer and more detailed and balanced sound on record, using multiple microphones, connected to multi-channel electronic amplifiers, compressors, filters and sound mixers. Electrical microphones led to a dramatic change in the performance style of singers, ushering in the age of the "Crooner", while electrical amplification had a wide-ranging impact in many areas, enabling the development of broadcast radio, public address systems, and electrically-amplified home gramophones. In addition, the development of electronic amplifiers for musical instruments now enabled quieter instruments such as the guitar and the string bass to complete on equal terms with the naturally louder wind and horn instruments, and musicians and composers also began to experiment with entirely new electronic musical instruments such the Theremin, the Ondes Martinot, the electric organ, and the Hammond Novachord, the world's first analogue polyphonic synthesiser.

Contemporary with these developments, the movie industry was engaged in a frantic race to develop practical methods of recording synchronised sound for films. Early attempts - such as the landmark 1928 film The Jazz Singer – used pre-recorded discs which were played in synchronisation with the action on the screen. By the early 1930s the movie industry had almost universally adopted the 'sound-on-film technology (again developed by Western Electric) and others, in which the audio signals picked up by the microphones were photoelectrically modulated to generate a narrow band of light, of variable width or height, which was then captured on a dedicated 'audio' strip on the film negative, as the images were being filmed. The development of sound of film also enabled movie-industry audio engineers to make rapid advances in the process we now know as "multi-tracking", by which multiple separately-recorded audio sources (such as voices, sound effects and background music) could be replayed simultaneously, mixed together, and synchronised with the action on film to create new 'blended' audio tracks of great sophistication and complexity.

Among the vast and often rapid changes that have taken place over the last century of audio recording, it is notable that there is one crucial audio device invented at the start of the "Electrical Era" has survived virtually unchanged since its introduction in 1925 – the electro-acoustic transducer, or loudspeaker. The most common form of electro-acoustic speaker the dynamic loudspeaker – which is effectively a dynamic microphone in reverse. This device typically consists of a flattened conical acoustic diaphragm (usually made of a stiff paper compound) suspended in a metal ring, at the apex of which a moving-coil magnet is attached. When an audio signal from a recording, a microphone, or an electrified instrument is fed through an amplifier to a loudspeaker, the electrical impulses drive the speaker magnet backward and forward, causing the speaker cone to vibrate, and this movement generates the audio-frequency pressure waves that travel through the air to our ears, which hear them as sound. Although there have been numerous refinements to the technology, and other related technologies have been introduced (e.g. the electrostatic loudspeaker), the basic design and function of the dynamic loudspeaker has not changed substantially in 90 years, and it remains overwhelmingly the most common, sonically accurate and reliable means of converting electronic audio signals back into audible sound.

The magnetic era (1945 to 1975)[edit]

The third wave of development in audio recording began in 1945, when the Allied nations gained access to a new German invention - magnetic tape recording. The technology was invented in the 1930s, but remained restricted to Germany (where it was widely used in broadcasting) until the end of World War II. Magnetic tape provided another dramatic leap in audio fidelity - indeed, Allied observers first became aware of the existence of the new technology because they noticed that the audio quality of obviously pre-recorded programs was practically indistinguishable from live broadcasts. From 1950 onwards, magnetic tape quickly became the standard medium of audio master recording in the radio and music industries, and led led to the development of the first hi-fi stereo recordings for the domestic market, the development of multi-track tape recording for music, and the demise of the disc as the primary mastering medium for sound. Magnetic tape also brought about a radical reshaping of the recording process - it made possible recordings of far longer duration and much higher fidelity than ever before, and it offered recording engineers the same exceptional plasticity that film gave to cinema editors - sounds captured on tape could now easily be manipulated sonically, edited, and combined in ways that were simply impossible with disc recordings. These experiments reached an early peak in the 1950s with the recordings of Les Paul and Mary Ford, who pioneered the use of tape editing and "multi-tracking" to create large 'virtual' ensembles of voices and instruments, constructed entirely from multiple taped recordings of their own voices and instruments. Magnetic tape fueled a rapid and radical expansion in the sophistication of popular music and other genres, allowing composers, producers, engineers and performers to realize previously unattainable levels of complexity. Other concurrent advances in audio technology led to the introduction of a range of new consumer audio formats and devices, on both disc and tape, including the development full-frequency-range disc reproduction, the change from shellac to polyvinyl plastic for disc manufacture, the invention of the 33rpm, 12-inch long-playing (LP) disc and the 45rpm 7-inch "single", the introduction of domestic and professional portable tape recorders (which enabled high-fidelity recordings of live performances), the popular 4-track cartridge and compact cassette formats, and even the world's first "sampling keyboards" - the pioneering tape-based keyboard instrument the Chamberlin, and its more famous successor, the Mellotron.

The "digital" era (1975 to present day)[edit]

The fourth and current “phase,” the “digital” era, has seen the most rapid, dramatic and far-reaching series of changes in the history of audio recording. In a period of less than 20 years, all previous recording technologies were rapidly superseded by digital sound encoding, which was perfected by the Japanese electronics corporation Sony in the 1970s. The first all-digitally-recorded popular music album, Ry Cooder's Bop 'Til You Drop, was released in 1979, and from that point, digital sound recording and reproduction quickly became the new standard at every level, from the professional recording studio to the home hi-fi. Concurrently, Sony assured the preeminence of its new digital recording system by introducing the most advanced consumer audio format to date - the digital compact disc (CD). The Compact disc rapidly replaced both the 12" album and the 7" single as the new standard consumer format, and ushered in a new era of high-fidelity consumer audio - CDs were small, portable and durable, and they could reproduce the entire audible sound spectrum, with perfect clarity and no distortion. Because CDs were encoded and read optically, using a laser beam, there was no physical contact between the disc and the playback mechanism, so a well-cared-for CD could be played over and over, with absolutely no degradation or loss of fidelity. CDs also represented a considerable advance in both the physical size of the medium, and its storage capacity - LPs could only practically hold about 50 minutes of audio, because they were physically limited by the size of the disc itself and the density of the grooves that could be cut into it - the longer the recording, the closer together the grooves and thus. the lower the overall fidelity; CDs, on the other hand they were less than half the overall size of the old 12" LP format, but offered about double the duration of the average LP, with up to 80 minutes of audio.

The Compact Disc almost totally dominated the consumer audio market by the end of the 20th century , but within another decade, rapid developments in computing technology saw it rendered virtually redundant in just a few years by the most radical invention in the history of audio recording - the digital audio file (.wav, .mp3 and other formats). Digital audio files effectively ended the need to use a discrete physical recording medium (a disc, or a reel of tape, etc.) as the primary means of capturing, manufacturing and distributing commercial sound recordings. Concurrent with the development of these digital file formats, dramatic advances in home computing and the rapid expansion of the Internet mean that digital sound recordings could now be captured, processed, reproduced, distributed and stored entirely electronically, on a wide range of magnetic and optical recording media, and these could be distributed almost anywhere in the world, with no loss of fidelity, and crucially, without the need to first transfer these files to some form of permanent recording medium for shipment and sale.

Acoustical recording[edit]

The earliest method of sound recording and reproduction involved the live recording of a performance directly to a recording medium. This was an entirely mechanical process, often called "acoustical recording". The sound of the performer(s) was captured by a diaphragm with the cutting needle connected to it. The needle cut a spiral groove in the recording medium. To make this process as efficient as possible, the diaphragm was located at the apex of a cone and the performers would crowd around the other end. If a performer was too loud then they would need to move back from the mouth of the cone to avoid drowning out the other performers. In some early jazz recordings a block of wood was used in place of the bass drum.

Phonautograph[edit]

Main article: Phonautograph

In 1857, Édouard-Léon Scott de Martinville invented the phonautograph, the first device that could record sound waves as they passed through the air. It was intended only for visual study of the recording and could not play back the sound. The recording medium was a sheet of soot-coated paper wrapped around a rotating cylinder carried on a threaded rod. A stylus, attached to a diaphragm through a series of levers, traced a line through the soot, creating a graphic record of the motions of the diaphragm as it was minutely propelled back and forth by the audio-frequency variations in air pressure.

In the spring of 1877 another inventor, Charles Cros, suggested that the process could be reversed by using photoengraving to convert the traced line into a groove that would guide the stylus, causing the original stylus vibrations to be recreated, passed on to the linked diaphragm, and sent back into the air as sound. An inventor from America soon eclipsed this idea, and it was not until 1887 that yet another inventor, Emile Berliner, actually photoengraved a phonautograph recording into metal and played it back.

Scott's early recordings languished in French archives until 2008, when scholars keen to resurrect the sounds captured in these and other types of early experimental recordings tracked them down. Rather than using rough 19th century technology to create playable versions, they were scanned into a computer and software was used to convert their sound-modulated traces into digital audio files. Brief excerpts from two French songs and a recitation in Italian, all recorded in 1860, are the most substantial results.[1]

Phonograph/Gramophone[edit]

Edison's cylinder-based Phonograph

The phonograph expanded on the principles of the phonautograph. Invented by Thomas Edison in 1877,[2] the phonograph was a device with a cylinder covered with an impressionable material such as tin foil, lead, or wax on which a stylus etched grooves. The depth of the grooves made by the stylus corresponded to changes in air pressure created by the original sound. The recording could be played back by tracing a needle through the groove and amplifying, through mechanical means, the resulting vibrations. A disadvantage of the early phonographs was the difficulty of reproducing the phonograph cylinders in mass production.

The disk-based gramophone

This changed with the advent of the gramophone (phonograph in American English), which was patented by Emile Berliner in 1887. The gramophone imprinted grooves on the flat side of a shellac disc rather than the outside of a cylinder. Instead of recording by varying the depth of the groove (vertically), as with the phonograph, the vibration of the recording stylus was across the width of the track (horizontally). The depth of the groove remained constant. Berliner called this audio disc a "gramophone record", although it was often called a "phonograph record" in U.S. English.

Early disc recordings and phonograph cylinders had about the same audio fidelity (despite the cylinder's theoretical advantages of constant linear groove speed and greater dynamic range of the hill-and-dale groove geometry). However, disc records were easier and cheaper to mass-produce. From the beginning, the flat disks were easily mass-produced by a direct molding process, pressing a master image on a plate of shellac.

Originally, cylinders could only be copied by means of a pantograph mechanism, which was limited to making about twenty-five copies (all of significantly lower quality than the original) while simultaneously destroying the original. During a recording session, ten or more machines could be ranged around the talent to record multiple originals. Still, a single performance could produce only a few hundred saleable copies, so performers were booked for marathon sessions in which they had to repeat their performances over and over again. By 1902, successful molding processes for cylinder recordings were developed.

The speed at which the disks were rotated was eventually standardized at 78 rpm. Later innovations allowed lower rotations: 45, 33⅓  and as slow as 16 rpm for broadcast transcriptions and some rare consumer recordings. The material used for the disc was eventually changed to vinyl.

Electrical recording[edit]

Both phonograph cylinders and gramophone discs were played on mechanical devices most commonly hand wound with a clockwork motor. The sound was amplified by a cone that was attached to the diaphragm. The disc record became more popular with the public, and cylinders were not produced after 1929. The advent of electrical recording in 1925 drastically improved the quality of the recording process of disc records. There was a period of nearly five years, from 1925 to 1930, when the premier technology for home sound reproduction consisted of a combination of electrically recorded records with the specially-developed Victor Orthophonic phonograph, a spring-wound acoustic phonograph which used waveguide engineering and a folded horn to provide a reasonably flat frequency response. Electrically-powered phonographs were introduced c. 1930, but the magnetic cartridge and electronic reproduction did not become common until the late 1930s.

The advent of electrical recording made it possible to use microphones to capture the sound of the performance. The leading record labels switched to the electric microphone process in 1925, and most other record companies followed their lead by the end of the decade. Electrical recording increased the flexibility of the process and the sound quality of the recordings. However, the performance was still cut directly to the recording medium, so if a mistake was made the recording was useless.

Electrical recording made it more feasible to record one part to disc and then play that back while playing another part, recording both parts to a second disc. This and conceptually related techniques, known as overdubbing, enable studios to create recorded "performances" that feature one or more artists each singing multiple parts or playing multiple instrument parts and that therefore could not be duplicated by the same artist or artists performing live. The first commercially issued records using over-dubbing were released by the Victor Talking Machine Company in the late 1920s. However overdubbing was of limited use until the advent of analogue recording on audio tape. Use of tape overdubbing was pioneered by Les Paul in the 1940s.

Magnetic recording[edit]

Main article: Magnetic recording

Magnetic recording was demonstrated in principle as early as 1898 by Valdemar Poulsen in his telegraphone. Magnetic wire recording, and its successor, magnetic tape recording, involve the use of a magnetized medium which moves with a constant speed past a recording head. An electrical signal, which is analogous to the sound that is to be recorded, is fed to the recording head, inducing a pattern of magnetization similar to the signal. A playback head can then pick up the changes in magnetic field from the tape and convert it into an electrical signal.

With the addition of electronic amplification developed by Curt Stille in the 1920s, the telegraphone evolved into wire recorders which were popular for voice recording and dictation during the 1940s and into the 1950s. The reproduction quality of wire recorders was significantly lower than that achievable with phonograph disk recording technology. There were also practical difficulties, such as the tendency of the wire to become tangled or snarled. Splicing could be performed by knotting together the cut wire ends, but the results were not very satisfactory.

On Christmas Day, 1932 the British Broadcasting Corporation first used a steel tape recorder for their broadcasts. The device used was a Marconi-Stille recorder,[3] a huge and dangerous machine which used steel razor tape 3 mm (0.1") wide and 0.08 mm (0.003") thick running at 90 metres per minute (approximately 300 feet per minute) past the recording and reproducing heads. This meant that the length of tape required for a half-hour programme was nearly 3 kilometres (1.9 mi) and a full reel weighed 25 kg (55 pounds).

Magnetic tape[edit]

7" reel of ¼" recording tape, typical of audiophile, consumer and educational use in the 1950s–60s

Engineers at AEG, working with the chemical giant IG Farben, created the world's first practical magnetic tape recorder, the 'K1', which was first demonstrated in 1935. During World War II, an engineer at the Reichs-Rundfunk-Gesellschaft discovered the AC biasing technique. With this technique, an inaudible high-frequency signal, typically in the range of 50 to 150 kHz, is added to the audio signal before being applied to the recording head. Biasing radically improved the sound quality of magnetic tape recordings. By 1943 AEG had developed stereo tape recorders.

During the war, the Allies became aware of radio broadcasts that seemed to be transcriptions (much of this due to the work of Richard H. Ranger), but their audio quality was indistinguishable from that of a live broadcast and their duration was far longer than was possible with 78 rpm discs. At the end of the war, the Allies captured a number of German Magnetophon recorders from Radio Luxembourg that aroused great interest. These recorders incorporated all of the key technological features of analogue magnetic recording, particularly the use of high-frequency bias.

Development of magnetic tape recorders in the late 1940s and early 1950s is associated with the Brush Development Company and its licensee, Ampex; the equally important development of magnetic tape media itself was led by Minnesota Mining and Manufacturing corporation (now known as 3M).

American audio engineer John T. Mullin and entertainer Bing Crosby were key players in the commercial development of magnetic tape. Mullin served in the U.S. Army Signal Corps and was posted to Paris in the final months of World War II; his unit was assigned to find out everything they could about German radio and electronics, including the investigation of claims that the Germans had been experimenting with high-energy directed radio beams as a means of disabling the electrical systems of aircraft. Mullin's unit soon amassed a collection of hundreds of low-quality magnetic dictating machines, but it was a chance visit to a studio at Bad Neuheim near Frankfurt while investigating radio beam rumours that yielded the real prize.

Mullin was given two suitcase-sized AEG 'Magnetophon' high-fidelity recorders and fifty reels of recording tape. He had them shipped home and over the next two years he worked on the machines constantly, modifying them and improving their performance. His major aim was to interest Hollywood studios in using magnetic tape for movie soundtrack recording.

Mullin gave two public demonstrations of his machines, and they caused a sensation among American audio professionals—many listeners could not believe that what they were hearing was not a live performance. By luck, Mullin's second demonstration was held at MGM studios in Hollywood and in the audience that day was Bing Crosby's technical director, Murdo Mackenzie. He arranged for Mullin to meet Crosby and in June 1947 he gave Crosby a private demonstration of his magnetic tape recorders.

Crosby was stunned by the amazing sound quality and instantly saw the huge commercial potential of the new machines. Live music was the standard for American radio at the time and the major radio networks did not permit the use of disc recording in many programs because of their comparatively poor sound quality. But Crosby disliked the regimentation of live broadcasts, preferring the relaxed atmosphere of the recording studio. He had asked NBC to let him pre-record his 1944–45 series on transcription discs, but the network refused, so Crosby had withdrawn from live radio for a year, returning for the 1946–47 season only reluctantly.

Mullin's tape recorder came along at precisely the right moment. Crosby realized that the new technology would enable him to pre-record his radio show with a sound quality that equaled live broadcasts, and that these tapes could be replayed many times with no appreciable loss of quality. Mullin was asked to tape one show as a test and was immediately hired as Crosby's chief engineer to pre-record the rest of the series.

Crosby became the first major American music star to use tape to pre-record radio broadcasts, and the first to master commercial recordings on tape. The taped Crosby radio shows were painstakingly edited through tape-splicing to give them a pace and flow that was wholly unprecedented in radio. Mullin even claims to have been the first to use "canned laughter"; at the insistence of Crosby's head writer, Bill Morrow, he inserted a segment of raucous laughter from an earlier show into a joke in a later show that had not worked well.

Keen to make use of the new recorders as soon as possible, Crosby invested $50,000 of his own money into Ampex, and the tiny six-man concern soon became the world leader in the development of tape recording, revolutionizing radio and recording with its famous Ampex Model 200 tape deck, issued in 1948 and developed directly from Mullin's modified Magnetophones.

Multitrack recording[edit]

Main article: Multitrack recording

The next major development in magnetic tape was multitrack recording, in which the tape is divided into multiple tracks parallel with each other. Because they are carried on the same medium, the tracks stay in perfect synchronization. The first development in multitracking was stereo sound, which divided the recording head into two tracks. First developed by German audio engineers ca. 1943, 2-track recording was rapidly adopted for modern music in the 1950s because it enabled signals from two or more separate microphones to be recorded simultaneously, enabling stereophonic recordings to be made and edited conveniently. (The first stereo recordings, on disks, had been made in the 1930s, but were never issued commercially.) Stereo (either true, two-microphone stereo or multimixed) quickly became the norm for commercial classical recordings and radio broadcasts, although many pop music and jazz recordings continued to be issued in monophonic sound until the mid-1960s.

Much of the credit for the development of multitrack recording goes to guitarist, composer and technician Les Paul, who also helped design the famous electric guitar that bears his name. His experiments with tapes and recorders in the early 1950s led him to order the first custom-built eight-track recorder from Ampex, and his pioneering recordings with his then wife, singer Mary Ford, were the first to make use of the technique of multitracking to record separate elements of a musical piece asynchronously — that is, separate elements could be recorded at different times. Paul's technique enabled him to listen to the tracks he had already taped and record new parts in time alongside them.

Multitrack recording was immediately taken up in a limited way by Ampex, who soon produced a commercial 3-track recorder. These proved extremely useful for popular music, since they enabled backing music to be recorded on two tracks (either to allow the overdubbing of separate parts, or to create a full stereo backing track) while the third track was reserved for the lead vocalist. Three-track recorders remained in widespread commercial use until the mid-1960s and many famous pop recordings — including many of Phil Spector's so-called "Wall of Sound" productions and early Motown hits — were taped on Ampex 3-track recorders. Engineer Tom Dowd was among the first to use multitrack recording for popular music production while working for Atlantic Records during the 1950s.

The next important development was 4-track recording. The advent of this improved system gave recording engineers and musicians vastly greater flexibility for recording and overdubbing, and 4-track was the studio standard for most of the later 1960s. Many of the most famous recordings by The Beatles and The Rolling Stones were recorded on 4-track, and the engineers at London's Abbey Road Studios became particularly adept at a technique called "reduction mixes" in the UK and "bouncing down" in the United States, in which several tracks were recorded onto one 4-track machine and then mixed together and transferred (bounced down) to one track of a second 4-track machine. In this way, it was possible to record literally dozens of separate tracks and combine them into finished recordings of great complexity.

All of the Beatles classic mid-1960s recordings, including the albums Revolver and Sgt. Pepper's Lonely Hearts Club Band, were recorded in this way. There were limitations, however, because of the build-up of noise during the bouncing-down process, and the Abbey Road engineers are still famed for their ability to create dense multitrack recordings while keeping background noise to a minimum.

4-track tape also enabled the development of quadraphonic sound, in which each of the four tracks was used to simulate a complete 360-degree surround sound. A number of albums were released both in stereo and quadrophonic format in the 1970s, but 'quad' failed to gain wide commercial acceptance. Although it is now considered a gimmick, it was the direct precursor of the surround sound technology that has become standard in many modern home theatre systems.

In a professional setting today, such as a studio, audio engineers may use 24 tracks or more for their recordings, using one or more tracks for each instrument played.

The combination of the ability to edit via tape splicing and the ability to record multiple tracks revolutionized studio recording. It became common studio recording practice to record on multiple tracks, and bounce down afterward. The convenience of tape editing and multitrack recording led to the rapid adoption of magnetic tape as the primary technology for commercial musical recordings. Although 33⅓ rpm and 45 rpm vinyl records were the dominant consumer format, recordings were customarily made first on tape, then transferred to disc, with Bing Crosby leading the way in the adoption of this method in the United States.

Further developments[edit]

Analog magnetic tape recording introduces noise, usually called "tape hiss", caused by the finite size of the magnetic particles in the tape. There is a direct tradeoff between noise and economics. Signal-to-noise ratio is increased at higher speeds and with wider tracks, and decreased at lower speeds and with narrower tracks.

By the late 1960s, disk reproducing equipment became so good that audiophiles soon became aware that some of the noise audible on recordings was not surface noise or deficiencies in their equipment, but reproduced tape hiss. A few specialist companies started making "direct to disc recordings", made by feeding microphone signals directly to a disk cutter (after amplification and mixing), in essence reverting to the pre-War direct method of recording. These recordings never became popular, but they dramatically demonstrated the magnitude and importance of the tape hiss problem.

audio cassette

Before 1963, when Philips introduced the Compact audio cassette, almost all tape recording had used the reel-to-reel (also called "open reel") format. Previous attempts to package the tape in a convenient cassette that required no threading met with limited success; the most successful was 8-track cartridge used primarily in automobiles for playback only. The Philips Compact audio cassette added much needed convenience to the tape recording format and a decade or so later had begun to dominate the consumer market, although it was to remain lower in quality than open reel formats.

In the 1970s, advances in solid-state electronics made the design and marketing of more sophisticated analog circuitry economically feasible. This led to a number of attempts to reduce tape hiss through the use of various forms of volume compression and expansion, the most notable and commercially successful being several systems developed by Dolby Laboratories. These systems divided the frequency spectrum into several bands and applied volume compression/expansion independently to each band (Engineers now often use the term "compansion" to refer to this process). The Dolby systems were very successful at increasing the effective dynamic range and signal-to-noise ratio of analog audio recording; to all intents and purposes, audible tape hiss could be eliminated. The original Dolby A was only used in professional recording. Successors found use in both professional and consumer formats; Dolby B became almost universal for prerecorded music on cassette. Subsequent forms, including Dolby C, (and the short-lived Dolby S) were developed for home use.

In the 1980s, digital recording methods were introduced, and analog tape recording was gradually displaced, although it has not disappeared by any means. (Many professional studios, particularly those catering to big-budget clients, use analog recorders for multitracking and/or mixdown.) Digital audio tape never became important as a consumer recording medium partially due to legal complications arising from piracy fears on the part of the record companies. They had opposed magnetic tape recording when it first became available to consumers, but the technical difficulty of juggling recording levels, overload distortion, and residual tape hiss was sufficiently high that magnetic tape piracy never became an insurmountable commercial problem. With digital methods, copies of recordings could be exact, and piracy might have become a serious commercial problem. Digital tape is still used in professional situations and the DAT variant has found a home in computer data backup applications. Many professional and home recordists now use hard-disk-based systems for recording, burning the final mixes to recordable CDs (CD-R's).

Most Police forces in the United Kingdom (and elsewhere) still use analogue compact cassette systems to record Police Interviews as it provides a medium less prone to accusations of tampering.[citation needed]

Recording on film[edit]

The first attempts to record sound to an optical medium occurred around 1900. In 1906, Eugene Augustin Lauste applied for a patent to record Sound-on-film, but was ahead of his time. In 1923, Lee de Forest applied for a patent to record to film; he also made a number of short experimental films, mostly of vaudeville performers. William Fox began releasing sound-on-film newsreels in 1926, the same year that Warner Brothers released Don Juan with music and sound effects recorded on discs, as well as a series of short films with fully-synchronized sound on discs. In 1927, the sound film The Jazz Singer was released; while not the first sound film, it made a tremendous hit and made the public and the film industry realize that sound film was more than a mere novelty.

The Jazz Singer used a process called Vitaphone that involved synchronizing the projected film to sound recorded on disk. It essentially amounted to playing a phonograph record, but one that was recorded with the best electronic technology of the time. Audiences used to acoustic phonographs and recordings would, in the theatre, have heard something resembling 1950s "high fidelity".

However, in the days of analog technology, no process involving a separate disk could hold synchronization precisely or reliably. Vitaphone was quickly supplanted by technologies which recorded an optical soundtrack directly onto the side of the strip of motion picture film. This was the dominant technology from the 1930s through the 1960s and is still in use as of 2013 although the analog soundtrack is being replaced by digital sound on film formats.

There are two types of synchronised film soundtrack, optical and magnetic. Optical sound tracks are visual renditions of sound wave forms and provide sound through a light beam and optical sensor within the projector. Magnetic sound tracks are essentially the same as used in conventional analog tape recording.

Magnetic soundtracks can be joined with the moving image but it creates an abrupt discontinuity because of the offset of the audio track relative to the picture. Whether optical or magnetic, the audio pickup must be located several inches ahead of the projection lamp, shutter and drive sprockets. There is usually a flywheel as well to smooth out the film motion to eliminate the flutter that would otherwise result from the negative pulldown mechanism. If you have films with a magnetic track, you should keep them away from strong magnetic sources, such as televisions. These can weaken or wipe the magnetic sound signal. Magnetic sound on a cellulose acetate film base is also more prone to vinegar syndrome than a film with just the image.

A variable density soundtrack (left)and a bi-lateral variable area soundtrack (right)

For optical recording on film there are two methods utilized. Variable density recording uses changes in the darkness of the soundtrack side of the film to represent the soundwave. Variable area recording uses changes in the width of a dark strip to represent the soundwave.

In both cases, light that is sent through the part of the film that corresponds to the soundtrack changes in intensity, proportional to the original sound, and that light is not projected on the screen but converted into an electrical signal by a light sensitive device.

Optical soundtracks are prone to the same sorts of degradation that affect the picture, such as scratching and copying.

Unlike the film image that creates the illusion of continuity, soundtracks are continuous. This means that if film with a combined soundtrack is cut and spliced, the image will cut cleanly but the sound track will most likely produce a cracking sound. Fingerprints on the film may also produce cracking or interference.

In the late 1950s, the cinema industry, desperate to provide a theatre experience that would be overwhelmingly superior to television, introduced widescreen processes such as Cinerama, Todd-AO and CinemaScope. These processes at the same time introduced technical improvements in sound, generally involving the use of multitrack magnetic sound, recorded on an oxide stripe laminated onto the film. In subsequent decades, a gradual evolution occurred with more and more theatres installing various forms of magnetic-sound equipment.

In the 1990s, digital audio systems were introduced and began to prevail. In many of them the sound recording is again recorded on a separate disk, as in Vitaphone; but digital processes can now achieve reliable and perfect synchronization.

Digital Recording[edit]

The DAT or Digital Audio Tape

The first digital audio recorders were reel-to-reel decks introduced by companies such as Denon (1972), Soundstream (1979) and Mitsubishi. They used a digital technology known as PCM recording. Within a few years, however, many studios were using devices that encoded the digital audio data into a standard video signal, which was then recorded on a U-matic or other videotape recorder, using the rotating-head technology that was standard for video. A similar technology was used for a consumer format, Digital Audio Tape (DAT) which used rotating heads on a narrow tape contained in a cassette. DAT records at sampling rates of 48 kHz or 44.1 kHz, the latter being the same rate used on compact discs. Bit depth is 16 bits, also the same as compact discs. DAT was a failure in the consumer-audio field (too expensive, too finicky, and crippled by anti-copying regulations), but it became popular in studios (particularly home studios) and radio stations. A failed digital tape recording system was the Digital Compact Cassette (DCC).

Within a few years after the introduction of digital recording, multitrack recorders (using stationary heads) were being produced for use in professional studios. In the early 1990s, relatively low-priced multitrack digital recorders were introduced for use in home studios; they returned to recording on videotape. The most notable of this type of recorder is the ADAT. Developed by Alesis and first released in 1991, the ADAT machine is capable of recording 8 tracks of digital audio onto a single S-VHS video cassette. The ADAT machine is still a very common fixture in professional and home studios around the world.

In the consumer market, tapes and gramophones were largely displaced by the compact disc (CD) and a lesser extent the minidisc. These recording media are fully digital and require complex electronics to play back.

Interference colours on a compact disc.

Digital sound files can be stored on any computer storage medium. The development of the MP3 audio file format, and legal issues involved in copying such files, has driven most of the innovation in music distribution since their introduction in the late 1990s.

As hard disk capacities and computer CPU speeds increased at the end of the 1990s, hard disk recording became more popular. As of early 2005 hard disk recording takes two forms. One is the use of standard desktop or laptop computers, with adapters for encoding audio into two or many tracks of digital audio. These adapters can either be in-the-box soundcards or external devices, either connecting to in-box interface cards or connecting to the computer via USB or Firewire cables. The other common form of hard disk recording uses a dedicated recorder which contains analog-to-digital and digital-to-analog converters as well as one or two removable hard drives for data storage. Such recorders, packing 24 tracks in a few units of rack space, are actually single-purpose computers, which can in turn be connected to standard computers for editing.

Technique[edit]

The analog tape recorder made it possible to erase or record over a previous recording so that mistakes could be fixed. Another advantage of recording on tape is the ability to cut the tape and join it back together. This allows the recording to be edited. Pieces of the recording can be removed, or rearranged. See also audio editing, audio mixing, multitrack recording.

The advent of electronic instruments (especially keyboards and synthesizers), effects and other instruments has led to the importance of MIDI in recording. For example, using MIDI timecode, it is possible to have different equipment 'trigger' without direct human intervention at the time of recording.

In more recent times, computers (digital audio workstations) have found an increasing role in the recording studio, as their use eases the tasks of cutting and looping, as well as allowing for instantaneous changes, such as duplication of parts, the addition of effects and the rearranging of parts of the recording.

See also[edit]

Notes[edit]

  1. ^ http://www.firstsounds.org Information on the recordings and their resurrection direct from the source. Careless reporting and errors abound in many of the secondary and nth-generation accounts.
  2. ^ Kernfeld, Barry. "Recording." Grove Music Online (2007). Oxford Music Online. Web.
  3. ^ "The Marconi-Stille". Retrieved 24 January 2015. 

References[edit]

  • Middleton, Richard (1990/2002). Studying Popular Music. Philadelphia: Open University Press. ISBN 0-335-15275-9.

Further reading[edit]

External links[edit]