发明名称 |
NOISE GATE, SOUND COLLECTION DEVICE, AND NOISE REMOVAL METHOD |
摘要 |
<p>A purpose of the invention is to provide a noise gate that can output an audio signal in which only a stationary noise is removed, without degrading an utterance voice of a speaking person. A sound collection device 1 includes an FFT processing unit 11, the noise gate 12, and an IFFT processing unit 13. The sound collection device 1 transforms a collected audio signal NE'T into a frequency spectrum NE'N by using the FFT processing unit 11. The noise gate 12 estimates a noise spectrum N'N of a stationary noise based on the frequency spectrum NE'N of the audio signal. The noise gate 12 decreases a signal level (a gain) of the audio signal in a case where a signal level ratio of the frequency spectrum NE'N of the audio signal to the noise spectrum N'N is less than a threshold value, and outputs the audio signal. The sound collection device 1 outputs an audio signal CO'T which is generated in such a manner that the IFFT processing unit 13 inversely transforms a frequency spectrum CO'N after removing the stationary noise N'N.</p> |
申请公布号 |
EP2352148(A1) |
申请公布日期 |
2011.08.03 |
申请号 |
EP20090827585 |
申请日期 |
2009.11.18 |
申请人 |
YAMAHA CORPORATION |
发明人 |
TANAKA, RYO;KURIYAMA, NAOTO |
分类号 |
G10L21/0208;G10L21/0232;H03G3/34 |
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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