Patent
1973-05-25
1976-01-13
Olms, Douglas W.
1791001TD, 1791004ST, H04R 500
Patent
active
039327060
ABSTRACT:
The invention discloses a system for synthesizing first and second recording or transmission signals adaptable for both of a discrete four-channel stereo sound reproducing system and a matrix four-channel stereo sound reproducing system. The first recording or transmission signal includes a first audio main signal and a first carrier signal frequency modulated by a first audio sub-signal, whereas the second recording or transmission signal includes a second audio main signal and a second carrier signal frequency modulated by a second audio sub-signal. Each of the first and second audio main signals is formed by combining four sound signals with a predetermined amplitude ratio and a predetermined phase relationship, whereas each of the first and second sub-signals is formed by combining three of the four sound signals with a predetermined amplitude ratio and a predetermined phase relationship. The first and second main signals are used to effect the matrix four-channel sound reproduction, while a combination of the first and second main signals and the first and second sub-signals is used to effect the discrete four-channel sound reproduction.
REFERENCES:
patent: 3761628 (1973-09-01), Bauer
Why The Four Channel War Need Not Take Place by Feldman, Audio Magazine, July 1972.
Ito Ryosuke
Takahashi Susumu
Olms Douglas W.
Sansui Electric Co. Ltd.
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