Electronic tuning type radio receivers

Details Electronic tuning type radio receivers Electronic tuning type radio receivers

1983-08-25

1985-01-22

Bookbinder, Marc E.

Telecommunications

Receiver or analog modulated signal frequency converter

Convertible to different type

455168, 455190, H04B 126

Patent

active

044956509

ABSTRACT:
An electronic tuning AM/FM radio receiver utilizes a common circuit for both FM reception and AM reception to stop automatically the scanning operation on the local oscillation frequency at its optimum point thus attaining simplicity of circuit structure, whereas the prior art needed a pair of complicated circuits for FM reception and AM reception. There is a local oscillator for AM reception and a second local oscillator for FM reception provided independently or commonly to each other, a control circuit provided for controlling selectively the scanning operation of the local oscillators and holding the local oscillation frequency of the selected one of the local oscillators at a scanning frequency when a tuning signal is applied, and a converter provided for converting an FM intermediate frequency into an AM intermediate frequency.

REFERENCES:
patent: 2487772 (1949-11-01), Nicholson, Jr. et al.
patent: 2666853 (1954-01-01), O'Brien
patent: 3334187 (1967-08-01), Pampel
patent: 3382442 (1968-05-01), Mayle
patent: 3575662 (1971-04-01), Davisson
patent: 3584307 (1971-06-01), Hewie
patent: 3800226 (1974-03-01), Close
patent: 3940697 (1976-02-01), Morgan
patent: 4214212 (1980-07-01), Dipietromaria

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