TG: videocassete sonoro(por)
UP (é traduzido por): U-matic (digital audio)(eng)
TR (processo/parte de): PCM(por)
UP (é traduzido por): U-matic (digital audio)(eng)
TR (processo/parte de): PCM(por)
Definição do conceito
[POR] U-matic (audio digital) |
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[ENG] U-matic | DIGITAL AUDIO | U-matic was also used for the storage of digital audio data. Most digital audio recordings from the 1980s were recorded on U-matic tape via a Sony PCM-1600, -1610, or -1630 PCM adaptor. These devices accepted stereo analogue audio, digitised it, and generated "pseudo video" from the bits, storing 48 bits—three 16-bit samples—as bright and dark regions along each scan line. (On a monitor the "video" looked like vibrating checkerboard patterns.) This could be recorded on a U-matic recorder. This was the first system used for mastering audio compact discs in the early 1980s. The famous compact disc 44.1 kHz sampling rate was based on a best-fit calculation for NTSC and PAL´s video´s horizontal line period and rate and U-matic´s luminance bandwidth. On playback the PCM adapter converted the light and dark regions back to bits. Glass masters for audio CDs were made via laser from the PCM-1600´s digital output to a photoresist- or dye-polymer-coated disc. This method was common until the mid-1990s. | SOURCE: U-matic. in: Wikipedia. Available at : https://en.wikipedia.org/wiki/U-matic Accessed : 06 aug. 2022
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[ENG] U-matic | Early digital tape recordings on PCM/ U-matic and Betamax video tape : We are now used to living in a born-digital environment, but the transition from analogue to digital technologies did not happen overnight. In the late 1970s, early digital audio recordings were made possible by a hybrid analogue/digital system. It was composed by the humble transport and recording mechanisms of the video tape machine, and a not so humble PCM (pulse-code-modulation) digital processor. Together they created the first two-channel stereo digital recording system. | SOURCE : GREATBEAR audio & video digitising. Early digital tape recordings on PCM/ U-matic and Betamax video tape. Available at : https://thegreatbear.co.uk/audio-tape/early-digital-tape-recordings-umatic-betamax-video-tape/ Accessed : 06 aug. 2022
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[ENG] U-matic | PCM digital audio recordings on Betamax, VHS or U-matic video tape : ... Developed in the late 1970s, PCM (pulse code modulation) digital audio harnessed the larger bandwidth of video tape technology to digitally encode an audio signal to magnetic tape. PCM digital audio was widely used for studio mastering until the introduction of Digital Audio Tape (DAT) in 1987. | At Greatbear, we carefully restore and migrate to digital files all variations of PCM audio recorded on Betamax, VHS, U-matic or other video tape. | SOURCE : GREATBEAR audio & video digitising. PCM audio on video tape. Available at : https://thegreatbear.co.uk/project/pcm-audio-on-video-tape/ Accessed : 06 aug. 2022.
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[ENG] U-matic (digital audio) | U-matic digital audio (1978 – late 1990s) | Sony’s U-matic ¾-inch video cassette format, despite being an analogue video format, was also used to store digital audio and was widely used for the mastering of Compact Discs in the 1980s and 1990s. The audio signal was stored on the tape as black and white video with light and dark regions, and the higher bandwidth of video tape recording made it possible to store PCM digital audio. | PCM (Pulse Code Modulation) is a technology with a long history of use in areas such as speech transmission, but it was further developed for use in hi-fidelity audio recording in the late 1960s by NHK in Japan with the first commercial digital audio recordings being released by Denon in 1971. | Digital audio recordings using PCM were initially stored on open reel video tape but video cassettes began to used with the launch of the Sony PCM-1 in 1977, a 2-channel consumer digital audio recording system that used Sony’s Betamax video cassette format. | Storage on U-matic video cassettes came about with the launch of the Sony PCM 1600 digital processor for professional use 1978. Later models included the PCM 1610 launched in 1980 and the PCM 1630 launched in 1983, and both of these later processors were widely used for Compact Disc mastering. Any U-matic tape could be used for audio mastering, but specially labelled tapes (such as 3M / Quantegy Digital Audio Mastering Cassettes) were available. | The 16 bit / 44 Khz sampling standard for Compact Disc Digital Audio was determined by the bandwidth available on U-matic tape. | In addition to Sony, JVC and Denon also used U-matic to record audio from their PCM processors.
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