FM tuning indicator

Details FM tuning indicator FM tuning indicator

1977-08-02

1978-07-25

Griffin, Robert L.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

325318, 325398, 325455, 307260, H04B 116

Patent

active

041032403

ABSTRACT:
An FM tuner comprising means for producing an intermediate frequency signal, a frequency discriminator circuit having "S" characteristics, a differential amplifier circuit, and detector means. The bias of said differential amplifier circuit is controlled in accordance with the direct current component of the output of said frequency discriminator circuit, and part of said intermediate frequency signal is passed to said detector means through said differential amplifier circuit, whereby that frequency position of said intermediate frequency signal which corresponds to the center of said direct current component is detected. Thus, it is possible to determine whether or not the FM tuner is in an optimum tuned state.

REFERENCES:
patent: 3333180 (1967-07-01), Neu
patent: 3418528 (1968-12-01), Watanabe
patent: 3696301 (1972-10-01), Hoshi
patent: 3748582 (1973-07-01), Ohsawa
patent: 3896386 (1975-07-01), Ohsawa

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