Patent
1980-12-02
1983-08-16
Pellinen, A. D.
179 1GE, H04H 500
Patent
active
043993257
ABSTRACT:
A demodulating circuit is capable of controlling stereo separation as a function of an electric field strength. An intermediate frequency signal not limited obtained from an intermediate frequency circuit is utilized as a signal representative of the level associated with the electric field strength. Stereo separation is discontinuously controlled as a function of the signal representative of the electric field strength. The separation is maintained in the possible maximum value in the region exceeding a predetermined value of the electric field strength but is abruptly decreased to a given value between a stereo state and a monaural state from the above described maximum value (stereo state) when the electric field strength becomes smaller than the above described predetermined value and the separation is changed as a function of the electric field strength in the region smaller than the above described value of the electric field strength.
REFERENCES:
patent: 3573382 (1971-04-01), Feit et al.
patent: 3617641 (1971-11-01), Feit et al.
patent: 3673342 (1972-06-01), Muller
patent: 3707603 (1972-12-01), Limberg
patent: 3790714 (1974-02-01), Ohsawa
patent: 4049918 (1977-09-01), Ohsawa
patent: 4251690 (1981-02-01), Takahashi et al.
Tanaka Kanji
Usui Noboru
Pellinen A. D.
Sanyo Electric Co,. Ltd.
Tokyo Sanyo Electric Co. Ltd.
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