发明名称 |
DIGITAL FILTER DESIGN METHOD AND APPARATUS FOR NOISE SUPPRESSION BY SPECTRAL SUBSTRACTION |
摘要 |
A digital filter design apparatus for noise suppression by spectral subtraction includes a first spectrum estimator for determining a high frequency resolution noisy speech power spectral density estimate from a noisy speech signal block. A second spectrum estimator determines a high frequency resolution background noise power spectral density estimate from a background noise signal block. Averaging units form a piece-wise constant noisy speech power spectral density estimate and a piece-wise constant background noise power spectral density estimate. These averaging units are controlled by devices for adapting the length of individual segments to the shape of the high frequency-resolution noisy speech power spectral density estimate and for using the same segmentation in both piecewise constant estimates. A piece-wise constant digital filter transfer function is determined using spectral subtraction-based on the piece-wise constant noisy speech power spectral density estimate and the piece-wise constant background noise power spectral density estimate. |
申请公布号 |
EP1221197(A1) |
申请公布日期 |
2002.07.10 |
申请号 |
EP20000957195 |
申请日期 |
2000.08.23 |
申请人 |
TELEFONAKTIEBOLAGET L M ERICSSON (PUBL) |
发明人 |
ERIKSSON, ANDERS |
分类号 |
G10L21/0208;H03H17/02;(IPC1-7):H03H17/02;H04B15/02;G10L21/02 |
主分类号 |
G10L21/0208 |
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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