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Consumer Electronics by S. P. Bali

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PCM AUDIO

All 8 mm decks can record high fidelity digital sound. The specifications are almost as impressive as those found on audio compact discs : 50 Hz to 15 kHz frequency response; 90 dB signal to noise ratio, 88 dB dynamic range. The analog-to-digital conversion uses 8-bit quantization (by comparison, compact audio discs use superior 16 bit quantization).

The process of digital recording is known as pulse-code modulation (PCM). In operation, a series of pulses that represents digital data is recorded on the tape. The pulses are derived by converting the original analog audio signal to digital form. For playback the pulses are processed in just the reverse to reconstitute analog audio from the digital. There are two digital audio modes: video-plus-audio ...

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