Automatic tuning device for FM receiver

Details Automatic tuning device for FM receiver Automatic tuning device for FM receiver

1982-09-30

1984-05-22

Ng, Jin F.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

455212, 455194, H03J 718

Patent

active

044505868

ABSTRACT:
This invention relates to a FM receiver and more particularly to a FM receiver having an auto-scanning circuit. In a conventional FM receiver using an auto-scanning circuit, a window comparator is provided at the latter position of a demodulation circuit. When an electromagnetic wave is received, scanning is stopped by using the both of DC component of demodulation voltage generated within a specific range of frequencies around the tuning frequency and a squelch signal. In the present invention, in order to utilize stabilized parts of DC component of the demodulation voltage, as much as possible, except for the rising parts of the DC component, a timing circuit is provided which is switched on by the demodulated signal outputted from the window comparator continuing for a given time, thereby a perfect tuning is assured.

REFERENCES:
patent: 3560858 (1971-02-01), Sakai et al.
patent: 3947774 (1976-03-01), Glennon et al.
patent: 4245348 (1981-01-01), Imazeki
patent: 4387469 (1983-06-01), Miyazaki et al.

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