Triphonic sound system

Details Triphonic sound system Triphonic sound system

1984-12-24

1986-09-30

Isen, Forester W.

Electrical audio signal processing systems and devices

Binaural and stereophonic

Center channel

H04R 500

Patent

active

046150439

ABSTRACT:
In a conventional stereo system, provided the listener remains equidistant from the left and right speakers, the common portions of the left and right signals produce in the mind of the listener the virtual source of sound thought to be located between the left and right speakers. In the present invention, the common components are used to power a third speaker located between the left and right speakers thereby providing a real source of sound, whereby the listener is not required to remain equidistant from the left and right speakers, but instead has considerably more latitude with respect to his position. The present invention takes the left and right signals produced by a stereo decoder, equalizes them, and develops a commonality index on which the allocation of the signals to the three speakers is based. Linear combinations of the equalized left and right signals are applied to the speakers with the coefficients each being a function only of the commonality index.

REFERENCES:
patent: 3497604 (1970-02-01), Welsh et al.
patent: 3944735 (1976-03-01), Willcocks
patent: 4024344 (1977-05-01), Dolby et al.
patent: 4063032 (1977-12-01), Willcocks
patent: 4293821 (1981-10-01), Boudouris et al.
patent: 4532647 (1985-07-01), Willcocks

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