Stereo/monaural detection apparatus

Details Stereo/monaural detection apparatus Stereo/monaural detection apparatus

1991-10-31

1993-05-11

Ng, Jin F.

Electrical audio signal processing systems and devices

Binaural and stereophonic

Broadcast or multiplex stereo

381 22, H04H 500

Patent

active

052107965

ABSTRACT:
A stereo/monaural detection apparatus for detecting whether two-channel input audio signals are stereo or monaural, wherein the level difference between the input audio signals is calculated, and after the signal representing the level difference is discriminated with a predetermined hysteresis maintained, a stereo/monaural detection is performed in accordance with the result of such discrimination, thereby preventing an erroneous detection that may otherwise be caused by any level difference variation during a short time as in a case where the sound field is positioned at the center in the stereo signals. And the discrimination with the hysteresis is partially inhibited in response to the signal obtained by discriminating the level sum of the input audio signals at a predetermined reference level, hence preventing instability of the operation when the audio input level is extremely feeble.

REFERENCES:
patent: 4236041 (1980-11-01), Thomas
patent: 4455673 (1984-06-01), Topping et al.
patent: 5046098 (1991-09-01), Mandell et al.
Elektronics, vol. 13, No. 147, Jul. 1987, pp. 36-37.

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