FM tuner

Details FM tuner FM tuner

1978-05-31

1980-03-18

Griffin, Robert L.

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency or phase modulation

455333, 455232, 455154, 307260, H04B 116

Patent

active

041941560

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: 4103240 (1978-06-01), Sakabe

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