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1. 发明申请

US20100067710A1 NOISE SPECTRUM TRACKING IN NOISY ACOUSTICAL SIGNALS 有权
公开(公告)号：US20100067710A1
公开(公告)日：2010-03-18
申请号：US12550926
申请日：2009-08-31
申请人： Richard C. HENDRIKS , Jesper Jensen , Ulrik Kjems , Richard Heusdens
发明人： Richard C. HENDRIKS , Jesper Jensen , Ulrik Kjems , Richard Heusdens
IPC分类号： H04R29/00
CPC分类号： G10L21/0208 , G10L21/0216 , G10L2021/0575
摘要： The invention relates to a method of estimating noise power spectral density PSD in an input sound signal comprising a noise signal part and a target signal part. The invention further relates to a system to its use. The object of the present invention is to provide a scheme for estimating the noise PSD in an acoustic signal consisting of a target signal contaminated by acoustic noise. The problem is solved by a method comprising the steps of d) providing a digitized electrical input signal to a control path and performing; d1) storing a number of time frames of the input signal each comprising a predefined number N2 of digital time samples xn (n=1, 2, . . . , N2), corresponding to a frame length in time of L2=N2/fs; d2) performing a time to frequency transformation of the stored time frames on a frame by frame basis to provide corresponding spectra Y of frequency samples; d3) deriving a periodogram comprising the energy content |Y|2 for each frequency sample in a spectrum, the energy content being the energy of the sum of the noise and target signal; d4) applying a gain function G to each frequency sample of a spectrum, thereby estimating the noise energy level |Ŵ|2 in each frequency sample, |Ŵ|2=G·|Y|2; d5) dividing the spectra into a number Nsb2 of sub-bands, each sub-band comprising a predetermined number nsb2 of frequency samples, and assuming that the noise PSD level is constant across a sub-band; d6) providing a first estimate |{circumflex over (N)}|2 of the noise PSD level in a sub-band based on the non-zero noise energy levels of the frequency samples in the sub-band; d7) providing a second, improved estimate |Ñ|2 of the noise PSD level in a sub-band by applying a bias compensation factor B to the first estimate, |Ñ|2=B·|{circumflex over (N)}|2. The invention may e.g. be used in listening devices, e.g. hearing aids, mobile telephones, headsets, active earplugs, etc.

2. 发明授权

US08712074B2 Noise spectrum tracking in noisy acoustical signals 有权
标题翻译：噪声频谱跟踪噪声信号
公开(公告)号：US08712074B2
公开(公告)日：2014-04-29
申请号：US12550926
申请日：2009-08-31
申请人： Richard C. Hendriks , Jesper Jensen , Ulrik Kjems , Richard Heusdens
发明人： Richard C. Hendriks , Jesper Jensen , Ulrik Kjems , Richard Heusdens
IPC分类号： H04B15/00
CPC分类号： G10L21/0208 , G10L21/0216 , G10L2021/0575
摘要： A method estimates noise power spectral density (PSD) in an input sound signal to generate an output for noise reduction of the input sound signal. The method includes storing frames of a digitized version of the input signal, each frame having a predefined number N2 of samples corresponding to a frame length in time of L2=N2/sampling frequency. It further includes performing a time to frequency transformation, deriving a periodogram comprising an energy content |Y|2 from the corresponding spectrum Y, applying a gain function G(k,m)=f(σs2(km),σw2l (k,m−1), |Y(k,m)|2), to estimate a noise energy level |Ŵ|2 in each frequency sample, where σs2 is the speech PSD and σw2 the noise PSD. It further includes dividing spectra into a number of sub-bands, and providing a first estimate |{circumflex over (N)}|2 of the noise PSD level in a sub-band and a second, improved estimate |{circumflex over (N)}|2 of the noise PSD level in a subband by applying a bias compensation factor B to the first estimate.
摘要翻译：方法估计输入声音信号中的噪声功率谱密度（PSD）以产生用于输入声音信号的噪声降低的输出。该方法包括存储输入信号的数字化版本的帧，每帧具有对应于L2 = N2 /采样频率的帧长度的预定数量的样本N2。它还包括执行时间到频率变换，从相应的频谱Y导出包括能量含量| Y | 2的周期图，应用增益函数G（k，m）= f（＆sgr; s2（km），＆sgr; w2l （k，m-1），| Y（k，m）| 2），以估计每个频率样本中的噪声能级|Ŵ| 2，其中＆sgr; s2是语音PSD，＆sgr; w2是噪声PSD。它还包括将频谱划分成多个子带，并且提供子带中的噪声PSD电平的第一估计|（在（N）} | 2）和第二估计|改善估计）} | 2，通过将偏置补偿因子B应用于第一估计，子带中的噪声PSD电平。

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