Discrete 4-channel stereo recording and/or reproducing system co

Details Discrete 4-channel stereo recording and/or reproducing system co Discrete 4-channel stereo recording and/or reproducing system co

1976-08-13

1978-09-19

Konick, Bernard

1791001TD, 179 1GQ, H04R 500

Patent

active

041156668

ABSTRACT:
A discrete 4-channel stereo recording and reproducing system which is based on a regular matrix type 4-channel stereo system and compatible with both of a regular matrix system and a CD-4 type 4-channel stereo system. In the audio frequency band, the same encoding as that in the regular matrix system is performed and, in the carrier frequency band, encoding for satisfying the compatibility with existing systems is achieved. The decoding is intended to improve the sound image location and separation in the reproduced sound field from CD-4 type stereo signals and automatic switching of a decoding circuit for the regular matrix type signals is achieved.

REFERENCES:
patent: 3686471 (1972-08-01), Takahashi
patent: 3745252 (1973-07-01), Bauer
patent: 3761628 (1973-09-01), Bauer
patent: 3787622 (1974-01-01), Itoh
patent: 3932706 (1976-01-01), Takahashi
patent: 3979564 (1976-09-01), Cho
"Why the Four Channel War Need Not Take Place", by L. Feldman, Audio Magazine, Jul., 1972, pp. 30-31.

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