Electrical audio signal processing systems and devices – Binaural and stereophonic – Broadcast or multiplex stereo
Patent
1985-01-04
1986-07-22
Isen, Forester W.
Electrical audio signal processing systems and devices
Binaural and stereophonic
Broadcast or multiplex stereo
329124, 329130, 329132, 332 23A, H04H 500
Patent
active
046023801
ABSTRACT:
A stereophonic broadcasting system incorporating companding of the difference signal in which both the usual difference signal and a compressed version of the difference signal are transmitted to one or more remote receivers. At the receiver the usual difference signal and the compressed difference signal are combined and the resulting signal then expanded to obtain a noise-reduced difference signal for matrixing with the sum signal to obtain the original left and right signals. Utilizing both difference signals increases the effective level of the received difference signal by 6 dB, whereas the noise is increased only 3 dB, for a net improvement of 3 dB in signal-to-noise ratio. Utilization of both difference signals at the receiver also permits compression of the difference signal according to any desired compression law.
REFERENCES:
patent: 3067292 (1962-12-01), Minter, II
patent: 4016366 (1977-04-01), Kurata
patent: 4338491 (1982-07-01), Parker et al.
patent: 4376916 (1983-03-01), Glaberson
patent: 4485483 (1984-11-01), Torick et al.
patent: 4534054 (1985-08-01), Maisel
CBS Inc.
Isen Forester W.
Olson Spencer E.
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