H - Electricity – 03 – D
Patent
H - Electricity
03
D
329/2
H03D 1/22 (2006.01) H04H 5/00 (2006.01)
Patent
CA 1081804
ABSTRACT OF THE DISCLOSURE 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 Rs respectively. A switching circuit of the balanced-modulator type is supplied with 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) sig- nal, 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.
264435
Gowling Lafleur Henderson Llp
Sony Corporation
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