Electronic switching for AM-FM radio

Details Electronic switching for AM-FM radio Electronic switching for AM-FM radio

1978-10-02

1981-03-10

Bookbinder, Marc E.

Telecommunications

Receiver or analog modulated signal frequency converter

Convertible to different type

329 1, 455189, 455266, H04B 126, H03D 500

Patent

active

042558158

ABSTRACT:
An integrated circuit, when operated from a simple single-pole-double throw switch, performs all of the functions required to switch modes in an FM-AM radio. The radio frequency circuits are switched directly and, in response to the AM oscillator circuit state, electronic switching is employed to switch the FM limiter, AM mixer, and audio amplifier. In the FM mode, the audio amplifier has high fidelity wide band response. In the AM mode, the audio amplifier is switched to operate with a reduced bandwidth. Thus, the audio amplifier does not produce signal components that can be picked up by the AM antenna, where they are interpreted as noise.

REFERENCES:
patent: 2133816 (1938-10-01), Holst
patent: 2491809 (1949-12-01), Fyler
patent: 3243708 (1966-03-01), Manson
patent: 3628146 (1971-12-01), Beckman

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