Multitrack system for PCM recording and playback of audio signal

Details Multitrack system for PCM recording and playback of audio signal Multitrack system for PCM recording and playback of audio signal

1990-06-21

1992-10-20

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

Converting an analog signal to digital form for recording;...

G11B 509

Patent

active

051575574

ABSTRACT:
A multitrack audio system having rotary heads by which audio signals are recorded onto a plurality of tracks and played back from the tracks on a magnetic tape comprises a track grouping circuit for dividing the tracks into track groups having the predetermined number of tracks; a type switching circuit for selecting the track groups; a first to fourth clock oscillators for generating sampling frequencies; a first circuit group which comprises a S/H circuit 15, and A/D conversion circuit, a 10-8 conversion circuit 19, and error detection/correction code additional circuit 21, and a time axis compression circuit 23 for converting the audio signals to digital signals; a modulator; a recording and playback circuit; a demodulator; a switching circuit for selecting the track group as an object of playback; and a second circuit group, which comprises a time axis re-expansion circuit, a error detection/correction circuit, a 8-10 conversion circuit, an interpolation circuit, and D/A conversion circuits for converting the digital signals demodulated by the demodulator into audio signals selected by the switching circuit.

REFERENCES:
patent: 4646171 (1987-02-01), OLdaka et al.
patent: 4719521 (1988-01-01), Juso
patent: 4816926 (1989-03-01), Moriwaki et al.

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