FM Stereo demodulation circuit with voltage dividing and multipl

Details FM Stereo demodulation circuit with voltage dividing and multipl FM Stereo demodulation circuit with voltage dividing and multipl

1981-11-20

1983-09-13

Hickey, R. J.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

179 1GD, 328 14, 329124, H04H 500, H03B 1900

Patent

active

044044305

ABSTRACT:
An FM stereo demodulation circuit comprises a resistor voltage dividing network having a plurality of outputs; a first switch circuit having a plurality of analog switches which respectively couple the outputs of the voltage dividing network to a first output terminal; a second switch circuit having a plurality of analog switches which respectively couple the outputs of the voltage dividing network to a second output terminal; and a switch control circuit which sequentially enables the analog switches of the first and second switch circuits over one cycle period of a subscarrier signal in response to a pilot signal in an FM stereo composite signal. The circuits produce a staircase-wave multiplying signal having a waveshape which depends on the setting of the resistance values of resistors of the voltage dividing network. The FM stereo composite signal having the pilot signal therein or the pilot signal removed therefrom prior to demodulation is applied to the voltage dividing network so that the FM stereo composite signal is multiplied by the multiplying signal to accomplish the FM stereo demodulation.

REFERENCES:
patent: 1691986 (1928-11-01), Nyquist
patent: 3649922 (1972-03-01), Ralph
patent: 3949206 (1976-04-01), Edwards et al.
patent: 4225914 (1980-09-01), Hirata et al.
patent: 4264784 (1981-04-01), Lorea
patent: 4366470 (1982-12-01), Takanashi et al.

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