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Encyclopedia > PCM adaptor

High-quality PCM audio requires a significantly larger bandwidth than a regular FM audio signal. For example, a 16-bit PCM signal requires an analogue bandwidth of about 1-1.5 MHz, and, clearly, a standard analogue audio recorder could not meet that requirement. The obvious answer, at that time, was to use a video tape recorder, which is capable of recording signals with this high bandwidth, to store the audio information. Such an audio recording system therefore includes two machines, namely the Pulse-code modulation (PCM) is a modulation technique. It is a digital representation of an analog signal where the magnitude of the signal is sampled regularly at uniform intervals. Every sample is quantized to a series of symbols in a digital code, which is usually a binary code. PCM is... PCM adaptor and the video tape recorder. A 'PCM adaptor has the analogue audio (stereo) signal as its input, and translates it into a series of binary digits, which, in turn, is modulated into a pseudo-video signal.


The pseudo-video signal can be stored on any ordinary analogue video tape recorder, since these were the only widely available devices with sufficient bandwidth. This helps to explain the choice of sampling frequency for the CD, because the number of video lines, frame rate and bits per line end up dictating the sampling frequency one can achieve. As we all know CD re-directs here; see Cd for other meanings of CD. Image of a compact disc (pencil included for scale) A compact disc (or CD) is an optical disc used to store digital data, originally developed for storing digital audio. A standard compact disc, often known as an audio CD... CD's sampling frequency, 44.1 kHz, was also adopted in the Compact Disc, as at that time, there was no other practical way of storing digital sound than by a PCM Converter & video recorder combination. The sampling frequencies of 44.1 and 44.056 kHz were thus the result of a need for compatibility with the NTSC is the analog television system in use in the United States and many other countries, including most of the Americas and some parts of East Asia. It is named for the National Television System(s) Committee, the industry-wide standardization body that created it. History The National Television Systems... NTSC and For other meanings of PAL see PAL (disambiguation). PAL, short for Phase Alternating Line, Phase Alternation by Line or for Phase Alternation Line, is a colour encoding used in broadcast television systems, used throughout the world except in most of the Americas, some East Asian countries (which use NTSC), parts... PAL color video formats used for audio storage at the time. The Sony 1600 was the first commercial video-based 16-bit recorder, and continues in its 1610 and 1630 incarnations. Key parameters: sixteen bits quantisation and the sampling frequency is 44.1 (or 44.056 for NTSC) kHz. The PCM adaptors could only store a single stereo signal, and could not be used for studio multi-track recording. Much later we have witnessed the advent of dedicated professional digital multi-track recorders such as The Mitsubishi companies, or the Mitsubishi Group of Companies or the Mitsubishi Group is a large group (keiretsu) of independently operated Japanese companies which share the Mitsubishi brand name. While the companies are autonomous, they share the brand name and trademark, as well as a common legacy (in general these... Mitsubishi’s ProDigi format and Sony Corporation (Japanese katakana: ソニー) (NYSE: SNE) is a consumer electronics corporation based in Tokyo, Japan. It was founded by Masaru Ibuka and Akio Morita on May 7, 1946 as the Tokyo Telecommunications Engineering with about 20 employees. Their first consumer product, in the late 1940s, was a... Sony’s DASH format. These recording machines accommodated the obligatory 44.1 kHz, but also 48 and 32 kHz as sampling rate.


  Results from FactBites:
 
PCM adaptor - Wikipedia, the free encyclopedia (379 words)
A 'PCM adaptor has the analogue audio (stereo) signal as its input, and translates it into a series of binary digits, which, in turn, is modulated into a pseudo-video signal.
The sampling frequencies of 44.1 and 44.056 kHz were thus the result of a need for compatibility with the NTSC and PAL color video formats used for audio storage at the time.
The PCM adaptors could only store a single stereo signal, and could not be used for studio multi-track recording.
Compact disc - Wikipedia, the free encyclopedia (3555 words)
A device that turns an analog audio signal into PCM audio, which in turn is changed into an analog video signal is called a PCM adaptor.
The Sony PCM-1610 and PCM-1630 are well known examples of PCM adaptors used in conjunction with the Sony U-Matic VCR.
Although experimental recordings exist from the 1960s, digital recording of classical and jazz music began to be made commercially in the early 1970s, pioneered by Japanese companies such as Denon; the first 16-bit PCM recording in the United States was made by Thomas Stockham at the Santa Fe Opera in 1976 on a Soundstream recorder.
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