Surround processor for audio signal

Details Surround processor for audio signal Surround processor for audio signal

1991-09-04

1992-10-13

Dwyer, James L.

Electrical audio signal processing systems and devices

Binaural and stereophonic

Pseudo stereophonic

381 11, 381 22, H04H 500, H04R 500

Patent

active

051557703

ABSTRACT:
A surround processor adapted to apply a stereo surround processing and a monaural surround processing to audio input signals of two channels to provide surround processed outputs, wherein a stereo/monaural discrimination output based on inputted audio signals of two channels is caused to have a predetermined time constant to provide a mixture ratio control signal to change a mixture ratio between a stereo surround processing output signal and a monaural surround processing output signal, to thereby discriminate whether an input signal is a stereo signal or a monaural signal and to automatically carry out switching between the surround processing output. The time constant prevents switching between the stereo surround processing state and the monaural surround processing state from being suddenly conducted.

REFERENCES:
patent: 3772479 (1973-11-01), Hilbert
patent: 3787629 (1974-01-01), Limberg
patent: 3934086 (1976-01-01), Takahashi
patent: 4091241 (1978-05-01), Sakaida
patent: 4815133 (1989-03-01), Hibino
patent: 4833715 (1989-05-01), Sakai
patent: 4907082 (1990-03-01), Richards

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