Compatible transmission techniques for FM stereophonic radio and television
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United States of America Patent
Stats
-
Jul 22, 1986
Grant Date -
N/A
app pub date -
Jan 4, 1985
filing date -
Jan 4, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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Cited Art Landscape
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