AM Stereophonic transmitter

Details AM Stereophonic transmitter AM Stereophonic transmitter

1982-06-22

1984-09-18

Pellinen, A. D.

Electrical audio signal processing systems and devices

Binaural and stereophonic

Broadcast or multiplex stereo

332 37D, 381 15, H04H 500

Patent

active

044728310

ABSTRACT:
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.degree.; a second phase shifting circuit which phase shifts the difference signal by +45.degree.; 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.sub.+ (1+m.sub.t X.sub.-), where X.sub.- represents the phase-shifted sum signal, m.sub.t 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 .sqroot.(1+X.sub.-).sup.2 -Y.sub.+.sup.2 (1+m.sub.t X.sub.-).sup.2, where Y.sub.+ 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..sub.c t carrier signal by the first modulated output signal; a second multiplier for modulating a cos .omega..sub.c t 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.

REFERENCES:
patent: 4185171 (1980-01-01), Parker
patent: 4373115 (1983-02-01), Kahn

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