Electrical audio signal processing systems and devices – Binaural and stereophonic – Broadcast or multiplex stereo
Patent
1985-02-20
1987-01-20
Isen, Forester W.
Electrical audio signal processing systems and devices
Binaural and stereophonic
Broadcast or multiplex stereo
332 17, 332 18, 332 21, 332 23A, 332 37D, 332 40, H04H 500
Patent
active
046385037
ABSTRACT:
A stereophonic transmitting system is disclosed for transmitting in quadrature a single carrier signal carrying first and second signals. The transmitting system comprises a phase shifter or modulator for phase shifting a carrier signal of a frequency fc in accordance with a feedback signal to provide a phase shifted carrier signal. A first detector operates to detect a component of the phase modulated carrier signal in phase with the carrier signal to provide an in-phase signal and a second detector to detect a component of the phase modulated carrier signal out-of-phase with the carrier signal to provide a quadrature signal. A first multiplier multiplies the in-phase signal by the first signal to provide a first multiplied signal and a second multiplier multiplies the quadrature signal by the second signal to provide a second multiplied signal. A difference circuit is provided for obtaining the difference between the first and second multiplied signals to provide the feedback signal to the phase shifter. A matrix provides a third signal indicative of the difference of the first and second signals and a fourth signal indicative of the sum of the first and second signals. A transmitter amplitude modulates the phase modulated carrier signal derived from the phase shifter in accordance with the third signal.
REFERENCES:
patent: 4323731 (1982-04-01), Hershberger
patent: 4338491 (1982-07-01), Parker et al.
patent: 4373115 (1983-02-01), Kahn
patent: 4520498 (1985-05-01), Hershberger
Delta Electronics
Gable R. Lewis
Isen Forester W.
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