Composite limiting sum and difference circuitry for extending th

Details Composite limiting sum and difference circuitry for extending th Composite limiting sum and difference circuitry for extending th

1979-11-15

1981-11-17

Olms, Douglas W.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

179 1GD, 455117, H04H 500

Patent

active

043013317

ABSTRACT:
A frequency modulated stereo transmitter in the preferred embodiment has a stereo generator which receives audio sterero signals directly. The stereo generator includes gain control circuitry which acts directly on the sum and difference signals generated in the stereo generator.
The stereo generator then directly modulates a modulation protion of an RF transmitter unit thereby maintaining a very high index of modulation. Audio gain control and audio limiting are thus eliminated. In alternative embodiments the stereo generator unit gain control circuitry is adapted to existing FM stereo transmitters.

REFERENCES:
patent: 2903518 (1959-09-01), Kahn
patent: 3233044 (1966-02-01), Hopper
patent: 3422356 (1969-01-01), Fritts
patent: 3529244 (1970-09-01), Torick et al.
patent: 3706852 (1972-12-01), Angus
patent: 3754099 (1973-08-01), Takaoka
patent: 3991370 (1976-11-01), Pate

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