FM Radio receiver

Details FM Radio receiver FM Radio receiver

1979-04-05

1980-09-23

Olms, Douglas W.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

455280, H04H 500

Patent

active

042244714

ABSTRACT:
An FM radio receiver in which the output of an FM detector is direct-coupled with the input of a stereo multiplex demodulator. The stereo multiplex demodulator circuit includes an operational amplifier having first and second inputs, a switch circuit having first and second outputs at which separate left and right audio signal components appear, and negative feedback paths having feedback resistors and led from the first and second outputs of the switch circuit to the first input of the operational amplifier. The second input of the operational amplifier is kept at a given DC potential so that the first input of the operational amplifier is biased to the given DC potential. A reference potential point of the FM detector is supplied with the given DC potential so that a DC potential at the output of the FM detector is made equal to the given DC potential, permitting direct-coupling of the output of the FM detector to the input of the stereo multiplex demodulator.

REFERENCES:
patent: 3087993 (1963-04-01), Van Hurck et al.
patent: 3974453 (1976-08-01), Ohsawa
patent: 4035585 (1977-07-01), Ogita
patent: 4063042 (1977-12-01), Mallon

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