Apparatus for mitigating signal distortion and noise signal cont

Details Apparatus for mitigating signal distortion and noise signal cont Apparatus for mitigating signal distortion and noise signal cont

1976-08-17

1977-11-22

Claffy, Kathleen H.

H04J 602

Patent

active

040597300

ABSTRACT:
In a communications system such as a time assignment speech interpolation (TASI) system for concentrating signals from N trunks onto C channels (C < N), and for expanding same, it is common for a speech signal to pass through a plurality of transmitter/receiver terminals, perhaps connected for tandem operation. Unfortunately, transmitter speech detector clipping of the speech signal leads to a distortion accumulation problem. Also, while a calling trunk is inactive, an inserted noise signal is commonly furnished by a receiver to the called trunk to avoid an aural "too quiet" condition. Unfortunately, actual calling trunk noise and the called trunk inserted noise may differ, leading to a noise signal contrast problem. To mitigate the signal contrast problem, communications apparatus including an improved noise signal inserting arrangement, responsive to a measure of calling trunk noise, supplies an adaptively adjusted, deterministic, pseudorandom noise signal to the called trunk. Thereafter, the presence or absence of the deterministic signal may be detected at a tandem transmitter and, responsive to its absence, the speech detector, at the tandem transmitter is overridden to mitigate the distortion accumulation of speech signal clipping.

REFERENCES:
patent: 2541932 (1951-02-01), Melhose
patent: 3878337 (1975-04-01), Fariello
patent: 3944945 (1976-03-01), Corte
patent: 4001505 (1977-01-01), Araseki
patent: 4002841 (1977-01-01), Ching
"Noise Limiters at Work", John D. Lenk, Radio-Electronics, Feb. 1968, pp. 44-45.
"Analysis and Digital Realization of a Pseudorandom Gaussian and Impulsive Noise Source", Y. Neuvo and W. Ku, IEEE Trans. Comm., Com-23, No. 9, Sept. 1975, pp. 849-858.

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