Apparatus for noise removal during the silence periods in the di

Details Apparatus for noise removal during the silence periods in the di Apparatus for noise removal during the silence periods in the di

1993-10-12

1996-09-03

MacDonald, Allen R.

395 271, 395 224, 395 228, G10L 900

Patent

active

055531920

ABSTRACT:
The disclosure is to eliminate discomforting background noise regenerated at a receive side (viz., a base station) in a mobile radio communications system wherein discontinuous transmission (DTX) is utilized. When speech pause is detected at the receive side, synthesis filter coefficients are produced using a background noise code which has been transmitted from a mobile unit. Subsequently, a Q value of the synthesis filter is measured using the above-mentioned synthesis filter coefficients. If the Q value is larger than a threshold level, each of the filter coefficients is lowered by a predetermined value. Thus, the regenerated discomforting background noise can effectively be reduced.

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ETSI-GSM 06.11, "Substitution and Mutingof Lost Frames for Full-Rate Speech Traffic Channels," ver. 3.0.0., 1991.
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Lenk, McGraw Hill Circuit Encyclopedia and Troubleshooting Guide, vol. 1, McGraw-Hill, New York, New York, 1993, pp. 85-86.
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"Discontinuous Transmission (DTx) for Full-Rate Speech Traffic Channels", ETS/TC GSM, GSM 06.31, Version 3.1.0, Mar. 1990, pp. 1-13.

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