Multiplex stereo demodulator

Details Multiplex stereo demodulator Multiplex stereo demodulator

1986-01-30

1987-03-17

Grimm, Siegfried H.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329103, 329112, 329122, 329126, 381 3, H03D 102, H04H 500

Patent

active

046511067

ABSTRACT:
A stereo demodulator capable of demodulating a composite signal without performing a switching operation is disclosed. A subcarrier generating circuit generates a square wave subcarrier signal V1 of 38 KHz which is in turn converted into a triangular wave subcarrier signal V4 of 38 KHz synchronized with the square wave subcarrier signal V1. The composite signal is converted into a current signal i which is then amplified by a voltage-controlled amplifier whose gain varies in accordance with the triangular wave subcarrier signal V4 applied thereto as a control voltage. Since the voltage-controlled amplifier is of such a type that the gain thereof logarithmically varies in accordance with the control voltage, the composite signal is amplified by a gain which varies substantially sinusoidally in accordance with the triangular wave subcarrier signal V4. As an output of the voltage-controlled amplifier is in the form of a pair of currents i.sub.R and i.sub.L which vary complementarily to each other, the signals represent right and left channel signals.

REFERENCES:
patent: 4035585 (1977-07-01), Ogita
patent: 4560942 (1985-12-01), Janta et al.

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