发明名称 |
Noise suppression system |
摘要 |
An improved noise suppression system (800) is disclosed which performs speech quality enhancement upon the speech-plus-noise signal available at the input (205) to generate a clean speech signal at the output (265) by spectral gain modification. The improvements of the present invention include the addition of a signal-to-noise ratio (SNR) threshold mechanism (830) to reduce background noise flutter by offsetting the gain rise of the gain tables until a certain SNR threshold is reached, the use of a voice metric calculator (810) to produce more accurate background noise estimates via performing the update decision based on the overall voice-like characteristics in the channels and the time interval since the last update, and the use of a channel SNR modifier (820) to provide immunity to narrowband noise bursts through modification of the SNR estimates based on the voice metric calculation and the channel energies.
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申请公布号 |
US4811404(A) |
申请公布日期 |
1989.03.07 |
申请号 |
US19870103857 |
申请日期 |
1987.10.01 |
申请人 |
MOTOROLA, INC. |
发明人 |
VILMUR, RICHARD J.;BARLO, JOSEPH J.;GERSON, IRA A.;LINDSLEY, BRETT L. |
分类号 |
H01B1/10;G10L11/02;G10L11/06;G10L21/02;H01B15/00;H04B1/10;H04B15/00;(IPC1-7):H04B15/00 |
主分类号 |
H01B1/10 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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