AM/FM receiver with automatic tuning system

Details AM/FM receiver with automatic tuning system AM/FM receiver with automatic tuning system

1985-09-25

1987-08-18

Ng, Jin F.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

455134, 455144, 455141, 455188, H03J 718

Patent

active

046882642

ABSTRACT:
An AM/FM receiver provided with an automatic tuning system is disclosed. The receiver includes an AM receiving section having an AM intermediate frequency stage, an FM receiving section having an FM intermediate frequency stage, a selection circuit selecting either one of signals derived from the AM and FM intermediate frequency stages, and a counter counting the frequency of the signal selected by the selection circuit. As a result, the presence of a broadcasting station for the automatic tuning operation is detected by the count value of the counter.

REFERENCES:
patent: 3665507 (1972-05-01), Peil
patent: 3803494 (1974-04-01), Howell et al.
patent: 3976943 (1976-08-01), Cipher et al.
patent: 4222121 (1980-09-01), Matsumoto et al.
patent: 4495650 (1985-01-01), Konishi et al.
patent: 4527281 (1985-07-01), Imagawa et al.

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