Apparatus and method for processing stereo signals for applicati

Details Apparatus and method for processing stereo signals for applicati Apparatus and method for processing stereo signals for applicati

1984-08-22

1987-07-07

Isen, Forester W.

Electrical audio signal processing systems and devices

Binaural and stereophonic

Broadcast or multiplex stereo

H04H 500

Patent

active

046792392

ABSTRACT:
In a system for processing stereo signals prior to application to an AM stereo channel information, the signals prior to broadcasting left channel and right channel automatic gain controllers are specially (L+R) gain controlled to maintain monaural loudness and are then followed by a low and high frequency equalizer and filter network. The system next transforms the audio into (L+R) and (L-R) signals and uses a multiband (L+R) and (L-R) peak limiting and clipping system with a variable gain (L-R) "stereo enhancement" amplifier located in the (L-R) path. The (L+R) and (L-R) audio is then applied to final peak clipping bandwidth filters. Finally, the (L+R) and (L-R) audio is transformed back into left and right audio which undergo left and right negative AGC'ing and peak clipping for decoding compatibility.

REFERENCES:
patent: 3732375 (1973-05-01), Kuribayashi
patent: 4359601 (1982-11-01), England
patent: 4486898 (1984-12-01), Yokoya
patent: 4535471 (1985-08-01), Kuroda

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