Enhancement of speech by adaptive filtering
Enhancement of speech by adaptive filtering
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DOI：
10.1109/icassp.1976.1170118
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发表时间：
1976-04
影响因子：
3.1
通讯作者：
R. Frazier;Siamak Samsam;L. Braida;A. Oppenheim
中科院分区：
文献类型：
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作者：
R. Frazier;Siamak Samsam;L. Braida;A. Oppenheim
在各种情况下，都会出现由于竞争说话者或背景噪声的存在而导致语音质量下降的增强语音问题。这种增强的一个可能的关键在于语音波形的准周期特性，它对应于频域中窄谐波间隔的能量带。语音增强的一种方法是利用时变数字梳状滤波器，滤波器通带的频率间隔随着要增强的语音信号的基频而变化。当基频变化足够慢时，使用梳状滤波器可以显着增强所需扬声器的性能，但当基频快速变化时，效果会降低。这里讨论的过程涉及自适应滤波器的使用。当基频恒定时，该自适应滤波器简化为梳状滤波器，但更一般地考虑基频的变化
In a variety of situations the problem of enhancing speech degraded by the presence of a competing speaker or background noise arises. A possible key to such enhancement lies in the quasi—periodic nature of the speech waveform which corresponds to narrow harmonically spaced bands of energy in the frequency domain. One approach to speech enhancement has been to utilize a time— variant digital comb filter for which the frequency spacing of the filter passbands varies with the fundamental frequency of the speech signal that is to be enhanced1. When the fundamental frequency varies sufficiently slowly, the use of a comb filter leads to significant enhancement of the desired speaker, but it degrades when the fundamental frequency varies rapidly. The procedure discussed here involves the use of an adaptive filter. When the fundamental frequency is constant, this adaptive filter reduces to a comb filter but more generally takes into account the variation of fundamental fre-