Methods and devices for recording, engraving and reproducing mod

Details Methods and devices for recording, engraving and reproducing mod Methods and devices for recording, engraving and reproducing mod

1973-12-19

1976-06-22

Aegerter, Richard E.

Undertaking

1791004ST, 179 1GQ, G11B 304

Patent

active

039647528

ABSTRACT:
A microgroove disk record for monophonic, stereophonic and tetraphonic reproduction of modulated information recorded on four separated tracks one of which corresponds to a left fore channel, another one to a right fore channel, another one to a left rear channel and another one to a right rear channel, comprising two adjacent parallel grooves one of which carries the tracks corresponding to the left fore and right fore channels and the other one carries the tracks corresponding to the left rear and right rear channels, the spacing between both channels being variable according to the modulation.

REFERENCES:
patent: 2977424 (1961-03-01), Redlich
patent: 3075052 (1963-01-01), Terry
patent: 3118977 (1964-01-01), Olson
patent: 3223789 (1965-12-01), Ooms

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