Electrical audio signal processing systems and devices – Binaural and stereophonic – Broadcast or multiplex stereo
Patent
1984-02-07
1985-04-09
Rubinson, Gene Z.
Electrical audio signal processing systems and devices
Binaural and stereophonic
Broadcast or multiplex stereo
H04H 500
Patent
active
045106142
ABSTRACT:
A method for generating a compatible AM quadrature stereo wave by delivering a modulated carrier with in-phase sidebands generated by a first combination of two signals, and quadrature sidebands generated by a second combination of the signals, the in-phase and quadrature sidebands having substantially the same maximum amplitude. The carrier and both sets of sidebands are delivered to an envelope detector, which delivers only the first combination of signals, undistorted by the presence of the quadrature sidebands. The carrier and both sets of sidebands are also delivered to a synchronous detector, which delivers only the first combination of signals with predistortion. The output of the synchronous detector is subtracted from the output of the envelope detector to obtain as a result the predistortion of the first signal combination due to the presence of the quadrature sidebands. The distortion is then passed through a filter with the pass-band of the signal frequency band, and an equalizer, which adjusts delay so that negative feedback occurs across a wide frequency band, in accordance with well-known theory. The output of the equalizer is delivered to the modulator for the first combination of signals, so that the transmitter delivers carrier, in-band predistorted sidebands, and quadrature sidebands, which are demodulated by the envelope detector of a receiver as the first combination of signals, free from distortion.
REFERENCES:
patent: 4332978 (1982-06-01), Streeter
patent: 4401853 (1983-08-01), Fisher et al.
D. Mennie, "AM Stereo, Five Competing Options", IEEE Spectrum, Jun. 1978, pp. 24-31.
Reference Data for Radio Engineers, 5th edition, ITT pp. 15-1 to 15-4.
Fisher Charles B.
Fisher Sidney T.
Brady W. J.
Rubinson Gene Z.
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