Speech coding system using variable threshold values for noise reduction
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United States of America Patent
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Apr 17, 1990
Grant Date -
N/A
app pub date -
May 21, 1987
filing date -
May 23, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A speech coding system includes apparatus for generating a variable threshold dependent upon the power of an input speech signal, and a comparator for comparing the power of the input speech signal with the variable threshold value to generate a discriminating signal for discriminating between a period when a speech continues and a period when the speech pauses, to change the coding operation for the input speech signal in accordance with the level of the discriminating signal, thereby forming voiced and unvoiced frames independently of each other.
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