Nonsynchronous independent side band AM stereo decoder

Details Nonsynchronous independent side band AM stereo decoder Nonsynchronous independent side band AM stereo decoder

1984-12-10

1987-09-15

Isen, Forester W.

Electrical audio signal processing systems and devices

Binaural and stereophonic

Broadcast or multiplex stereo

H04H 500

Patent

active

046945016

ABSTRACT:
An AM stereo receiver uses an AM detector (208) and an asynchronous PM detector (206) to decode AM stereo signals. The AM stereo broadcast signal has a carrier signal phase modulated with a modified phase shifted left channel minus right channel (L-R) audio signal, which is then amplitude modulated with a phase shifted left channel plus right channel (L+R) audio signal.
The AM detector (208) within the receiver decodes the phase shifted L+R signal, while the PM detector 206 within the receiver decodes the modified phase shifted L-R signal. A phase shifter (214) restores the L+R and L-R signals to their proper phase relationship. A matrix circuit (228) regenerates the left and right channel signals from the L+R and L-R signals.

REFERENCES:
patent: 3218393 (1965-11-01), Kahn
patent: 3908090 (1975-09-01), Kahn
patent: 3944749 (1976-03-01), Kahn
patent: 4018994 (1977-04-01), Kahn
patent: 4349696 (1982-09-01), Akitake et al.
patent: 4362999 (1982-12-01), Sauer
patent: 4375580 (1983-03-01), Sauer
patent: 4377725 (1983-03-01), Hershberger
"AM Stereo" by National Semiconductor Corp.
"Linear Application Update" by National Semiconductor Corp.
"Kahn/Hazeltine Independent Side Band (ISB) AM Stereo System" by Hazeltine Research, Inc.
"LM1981 AM Stereo Decoder" by National Semiconductor Corp.
"A Stereophonic System for Amplitude Modulated Broadcast Stations" by Leonard Kahn, published in IEEE Transactions on Broadcasting--1981.

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