Three-track sterophonic system

Details Three-track sterophonic system Three-track sterophonic system

1985-07-25

1988-05-24

Isen, Forester W.

Electrical audio signal processing systems and devices

Binaural and stereophonic

Center channel

381106, H04S 300

Patent

active

047471425

ABSTRACT:
In a stereophonic reproduction system, a true center-channel signal is derived by combining the left and right signals into a monophonic signal, and canceling and overriding this monophonic signal with a second modified monophonic signal, the latter derived by combining properly bandpassed left and right signals that have been compressed, combined, and expanded. True left-and true right-channel signals are subsequently derived by subtracting the true center-channel signal voltage from the left and right signal voltages.

REFERENCES:
patent: 3679832 (1972-07-01), Halpern
patent: 4024344 (1977-05-01), Dolby et al.
patent: 4074083 (1978-02-01), Berkovitz et al.
patent: 4293821 (1981-10-01), Bourdouris et al.
patent: 4442546 (1984-04-01), Ishigaki
patent: 4498060 (1985-02-01), Dolby

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