Reducing audible noise in stereo receiving

Details Reducing audible noise in stereo receiving Reducing audible noise in stereo receiving

1991-04-18

1993-10-12

Ng, Jin F.

Electrical audio signal processing systems and devices

Binaural and stereophonic

Broadcast or multiplex stereo

381 15, H04H 500

Patent

active

052532984

ABSTRACT:
A receiver for receiving a stereophonic signal with upper and lower sidebands carrying a modulating signal includes independent sideband circuitry for providing upper and lower sideband signals. Selector circuitry responds to the level of audible noise in each of the upper and lower sideband signals for selecting that one of the sideband signals having a lower level of audible noise relative to the other. An ISB highpass filter filters the latter sideband signal to provide a highpass filtered sideband signal. Stereo detector circuitry provides left and right stereophonic audio signals. At least one audio lowpass filter filters the left and right stereophonic signals to provide corresponding lowpass filtered left and right stereophonic audio signals. At least one signal combiner combines the highpass filtered sideband signal with each of the lowpass filtered left and right stereophonic audio signals to provide corresponding composite left and right audio signals.

REFERENCES:
patent: 3952161 (1976-04-01), Gilbert et al.
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patent: 4406922 (1983-09-01), Parker et al.
patent: 4680795 (1987-07-01), Eckland
patent: 4866779 (1989-09-01), Kennedy et al.
patent: 5008939 (1991-04-01), Bose et al.
European Search Report Ref. 90/4426/02, Application No. 92303247.8, dated Mar. 26, 1993.

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