Exponential echo and noise reduction in silence intervals

Details Exponential echo and noise reduction in silence intervals Exponential echo and noise reduction in silence intervals

2006-02-14

2006-02-14

Chawan, Vijay B. (Department: 2654)

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

C704S214000, C704S209000, C375S326000, C381S104000

Reexamination Certificate

active

06999920

ABSTRACT:
Method for the reduction of echo and/or noise signals in TK systems for the transmission of useful acoustic signals, in which, when a silence interval is present, the distorted useful signal is modified by a time-dependent control signal ao(t) or by a control signal ao(k) cycled in the rhythm of a scan rate fT=1/T. The control signal ao(k) is varied in such manner that, during the presence of speech signals in the useful signals, the amplitude of the control signal ao(k) is set to a predetermined constant value coand, when a silence interval begins, the amplitude of the control signal ao(k) is reduced continuously from one sample value to the next in accordance with the recurrence formula ao(k+1)=ao(k).β with β<1. After the end of the silence interval, ao(k) is again set equal to co.

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