Disc record system employing signal redundancy

Details Disc record system employing signal redundancy Disc record system employing signal redundancy

1980-11-07

1983-05-03

Atkinson, Charles E.

Excavating

360 381, G06F 1110, H04N 576

Patent

active

043822991

ABSTRACT:
A high performance disc record recording system wherein a digital manifestation of the signal to be recorded modulates a first carrier frequency and a temporally displaced analog manifestation of the same signal modulates a second carrier frequency. The modulated carriers are linearly combined for recording in a single record track. The digital signal is encoded for error detection and/or correction. On playback the modulated carriers are separated and demodulated. One of the separated signals is delayed so that the two signals are returned to temporal coincidence. The digital manifestation of signal is reconverted to analog format and utilized as the primary output signal. However, upon detection of errors in the digital signal the analog manifestation of the signal is substituted for the primary signal.

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Welland et al., AES PREPRINT 1562, (G-7), "The MD (Mini-Disk) System-A Contribution to the Digital Audio Disk Standard".
Vries, L. B., AES PREPRINT 1548, (G-8), "Error Control System of Philips Compact Disc".

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