Apparatus for reducing the effect of noise interference in audio

Details Apparatus for reducing the effect of noise interference in audio Apparatus for reducing the effect of noise interference in audio

1984-03-27

1987-04-28

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

381106, H04N 704

Patent

active

046618511

ABSTRACT:
A companding system for a television audio apparatus includes a compressor and an expander for stereo difference or second audio program signals. The compressor provides variable preemphasis of high frequency signal components and the expander provides complementary variable deemphasis. Due to noise, the amount of deemphasis the expander can provide is limited. To ensure complementary operation of the compressor and expander a clamp means is used in the compressor to set the maximum amount of preemphasis. Similarly, in the expander, a clamp is used to set the maximum deemphasis of the compressor.

REFERENCES:
patent: 4224581 (1980-09-01), Watanabe et al.
patent: 4498055 (1985-02-01), Dolby
"Compandor Complexity Analyses" published by Broadcast Television Systems Committee of the Electronic Industries Association, Dec. 12, 1983, pp. 23-46.

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