Method and apparatus for reducing noise in a linked compressor-e

Details Method and apparatus for reducing noise in a linked compressor-e Method and apparatus for reducing noise in a linked compressor-e

1989-02-02

1990-07-24

Orsino, Joseph A.

Telecommunications

Transmitter and receiver at separate stations

455 63, 455296, 455312, 455 50, 333 14, H04B 116

Patent

active

049440241

ABSTRACT:
A method and apparatus for reducing noise fluctuation in a linked compressor-expander (Lincompex) telecommunications system in which an artificial tone signal is injected into a demodulator of the communication system to bias the output toward self quieting. The artificial tone is developed to have a level that is effective below a threshold level of Lincompex demodulation such that during normal communication transmission, the artificial tone has no deleterious effect, while below the demodulation threshold, random noise inputs are effectively biased to a constant level to produce a quieting effect on the demodulator output.

REFERENCES:
patent: 3828280 (1974-08-01), Dolby
patent: 4642583 (1987-02-01), Fucito
D. M. Russell, Conference=International Broadcasting Convention, Brigheon, England, Sep. 20-23, 1980 (pp. 281-286).

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