AM Stereophonic signal receiver with electric field strength det

Details AM Stereophonic signal receiver with electric field strength det AM Stereophonic signal receiver with electric field strength det

1981-01-21

1983-01-11

Pellinen, A. D.

179 1GM, H04H 500

Patent

active

043683550

ABSTRACT:
An AM stereophonic receiver in which degradation of the quality of reproduced sound due to a decreased electric field strength is prevented. A main signal detector produces a sum signal representing the sum of first and second channel signals while a sub signal detector produces a difference signal representing the difference therebetween. The sum signal is coupled directly to a matrix circuit while the difference signal is coupled through a variable control type low-pass filter and a monophonic/stereophonic switch to the matrix circuit. The low-pass filter is controlled by a detection signal representative of the electric field strength of the received signal to reduce high frequency components when the electric field strength decreases below a predetermined value. The low-pass filter is bypassed when the electric field strength is sufficiently high.

REFERENCES:
patent: 4157455 (1979-06-01), Okatani et al.
patent: 4206317 (1980-06-01), Kahn
patent: 4208547 (1980-06-01), Simeau

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