H - Electricity – 04 – H
Patent
H - Electricity
04
H
325/48
H04H 5/00 (2006.01)
Patent
CA 1189573
ABSTRACT OF THE DISCLOSURE An AM stereophonic signal transmitter includes a matrix circuit which generates a sum signal corresponding to the sum of left and right channel stereophonic signals and a difference signal corresponding to the difference between the left and right channel stereophonic signals; a first phase shifting circuit which phase shifts the sum signal by -45°; a second phase shifting circuit which phase shifts the difference signal by +45°; a sub-modulator which modulates the phase-shifted difference signal by the phase-shifted sum signal to produce a first modulated output signal having the form Y+(1 + mtX_), where X_ represents the phase-shifted sum signal, mt represents the modulation factor of the sub-modulator and 1 represents a carrier component; a modifying circuit for modifying the phase-shifted sum signal to produce a modified signal having the form Image Image , where Y+ represents the phase-shifted difference signal, and which provides that the AM stereophonic signal transmitted by the transmitter has a substantially distortion-free envelope component; a first multiplier for modulating a -sin .omega.ct carrier signal by the first modulated output signal; a second multiplier for modulating a cos .omega.ct carrier signal by the modified signal; and an adder for adding the outputs of the first and second multipliers to produce the AM stereophonic signal having a substantially distortion-free envelope component which is to be transmitted.
405850
Gowling Lafleur Henderson Llp
Sony Corporation
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