Circuit for demodulating a stereo signal

Details Circuit for demodulating a stereo signal Circuit for demodulating a stereo signal

1976-10-28

1978-02-14

Olms, Douglas W.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329167, H04H 500

Patent

active

040740757

ABSTRACT:
A circuit for demodulating a composite stereo signal of the type including a main-channel (L+R) signal and a sub-channel (L-R) signal to derive therefrom individual channel information signals L and R, respectively. A switching circuit of the balanced-modulator type is supplied with the composite stereo signal at one set of input terminals and with a switching signal whose frequency is equal to the sub-carrier onto which the sub-channel (L-R) signal is modulated, at another set of input terminals. The switching circuit produces oppositely-phased sub-channel signals which are applied to first and second current generators, respectively. An amplifier is supplied with the composite stereo signal to amplify the main-channel (L+R) signal, the amplifier including a channel separation control to adjustably vary the currents flowing through the amplifier so as to correspondingly vary the main-channel (L+R) currents. The main-channel currents produced by the amplifier and the oppositely-phased sub-channel currents produced by the current generators are supplied to respective output terminals whereat they are combined to produce the separate channel information signals L and R with minimum crosstalk.

REFERENCES:
patent: 3707603 (1972-12-01), Limberg
patent: 3798376 (1974-03-01), Limberg
patent: 3947645 (1976-03-01), Mizukami et al.
patent: 3985964 (1976-10-01), Ohkubo et al.

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