发明名称 |
METHOD AND DEVICE FOR SUPPRESSING NOISE |
摘要 |
PROBLEM TO BE SOLVED: To suppress not only stationary noise but also non-stationary noise. SOLUTION: An FFT(fast Fourier transform) part 11 converts an input signal (a1) from a time domain into a frequency domain in each frame. A siren sound suppression information setting part 12 detects the presence of a siren sound from the converted spectrum, outputs a siren sound presence flag, also extracts the fundamental frequency of the siren sound and outputs the fundamental frequency. A siren sound suppressing part 13 suppresses non-stationary noise by suppressing a fundamental frequency F1 ' and the r-th harmonic component of the frequency F1 ' from a spectrum G0 (k) when the siren sound presence flag indicates 'presence'. An IFFT(inverse fast Fourier transform) part returns the output of the suppressing part 13, the non-stationary noise of which is suppressed to a time domain and outputs the output of the suppressing part 13. |
申请公布号 |
JP2002258899(A) |
申请公布日期 |
2002.09.11 |
申请号 |
JP20010058134 |
申请日期 |
2001.03.02 |
申请人 |
YRP KOKINO IDOTAI TSUSHIN KENKYUSHO:KK |
发明人 |
SASAKI SEIJI;FUMOTO TERUO |
分类号 |
G10L21/02;G10L11/00;G10L11/04;H04B1/10;(IPC1-7):G10L21/02 |
主分类号 |
G10L21/02 |
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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