Compatible AM stereo system employing a modified quadrature modu

Details Compatible AM stereo system employing a modified quadrature modu Compatible AM stereo system employing a modified quadrature modu

1979-03-12

1980-11-25

Olms, Douglas W.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329 50, 332 40, 455117, H04H 500

Patent

active

042360420

ABSTRACT:
A compatible AM stereo system including a modified quadrature modulation scheme. Two stereo modulators are described which each generate composite modulated signals including a carrier component and two phase-shifted components. The two phase-shifted components, corresponding to the left (L) and right (R) source signals, are phase shifted by equal phase angles .theta. on either side of the carrier, where .theta. is between 10.degree. and 20.degree.. A limiter is included which operates to limit the magnitude of the source signals supplied by the stereo modulator. The limiter allows each source signal to contribute up to 80% of the total modulation, as long as total modulation constraints are not exceeded due to the combined amplitudes of the two source signals. A receiver is described for demodulating the composite modulated signal.

REFERENCES:
patent: 1666158 (1928-04-01), Affel
patent: 2903518 (1959-09-01), Kahn
patent: 3102167 (1963-08-01), Barton
patent: 3109896 (1963-11-01), Boothroyd
patent: 3128345 (1964-04-01), Freedman et al.
patent: 3137816 (1964-06-01), Mc Lin et al.
patent: 3217105 (1965-11-01), Barton
patent: 3231672 (1966-01-01), Collins et al.
patent: 3732375 (1973-05-01), Kuribayashi
patent: 3936594 (1976-02-01), Schubin et al.
RCA Review, Sep. 1960, pp. 299-359.

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