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    • 3. 发明申请
    • NOISE SPECTRUM TRACKING IN NOISY ACOUSTICAL SIGNALS
    • US20100067710A1
    • 2010-03-18
    • US12550926
    • 2009-08-31
    • Richard C. HENDRIKSJesper JensenUlrik KjemsRichard Heusdens
    • Richard C. HENDRIKSJesper JensenUlrik KjemsRichard Heusdens
    • H04R29/00
    • G10L21/0208G10L21/0216G10L2021/0575
    • 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.
    • 4. 发明授权
    • Noise spectrum tracking in noisy acoustical signals
    • 噪声频谱跟踪噪声信号
    • US08712074B2
    • 2014-04-29
    • US12550926
    • 2009-08-31
    • Richard C. HendriksJesper JensenUlrik KjemsRichard Heusdens
    • Richard C. HendriksJesper JensenUlrik KjemsRichard Heusdens
    • H04B15/00
    • G10L21/0208G10L21/0216G10L2021/0575
    • 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.
    • 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。
    • 8. 发明授权
    • System for reducing acoustic feedback in hearing aids using inter-aural signal transmission, method and use
    • 使用听觉信号传输,方法和用途减少助听器中的声反馈的系统
    • US08542855B2
    • 2013-09-24
    • US12506635
    • 2009-07-21
    • Thomas Bo ElmedybJesper JensenMeng Guo
    • Thomas Bo ElmedybJesper JensenMeng Guo
    • H04R25/00
    • H04R25/552H04R5/033H04R25/453
    • The invention relates to a hearing aid system comprising first and second spatially separated hearing instruments, the system being adapted for processing input sounds to output sounds according to a user's needs. The invention further relates to a method and use. The object of the present invention is to provide an alternative scheme for reducing the effect of acoustic feedback in a hearing aid system. The problem is solved in that the hearing instruments comprises, respectively, first and second input transducers for converting a first input sound to first and second electric input signal, and first and second output transducers for converting first and second processed electric output signal to first and second output sounds, wherein the system is adapted to provide that a first Tx-signal originating from the first electric input signal of the first hearing instrument is transmitted to the second hearing instrument and used in the formation of the second processed electric output signal, and that a second Tx-signal originating from the second electric input signal of the second hearing instrument is transmitted to the first hearing instrument and used in the formation of the first processed electric output signal. This has the advantage of providing a scheme for reducing or effectively eliminating acoustic feedback in a pair of hearing instruments. The invention may e.g. be used in listening devices, e.g. hearing aids, head sets, or active ear plugs.
    • 本发明涉及一种包括第一和第二空间分离的听力仪器的助听器系统,该系统适于根据用户的需要处理输入声音以输出声音。 本发明还涉及一种方法和用途。 本发明的目的是提供一种用于减少助听器系统中声反馈的影响的替代方案。 解决的问题在于,听力仪器分别包括用于将第一输入声音转换为第一和第二电输入信号的第一和第二输入换能器,以及用于将第一和第二处理电输出信号转换为第一和第二输入信号的第一和第二输出换能器 第二输出声音,其中所述系统适于提供源自所述第一听力仪器的第一电输入信号的第一Tx信号被发送到所述第二听力仪器并用于形成所述第二处理电输出信号,以及 来自第二听力仪器的第二电输入信号的第二Tx信号被发送到第一听力仪器,并用于形成第一处理电输出信号。 这具有提供用于减少或有效地消除一对听力仪器中的声反馈的方案的优点。 本发明可以例如 用于听音装置,例如 助听器,头戴式耳塞或有源耳塞。
    • 9. 发明授权
    • Adaptive long-term prediction filter for adaptive whitening
    • 用于自适应白化的自适应长期预测滤波器
    • US08422708B2
    • 2013-04-16
    • US12506983
    • 2009-07-21
    • Thomas Bo ElmedybJesper Jensen
    • Thomas Bo ElmedybJesper Jensen
    • H04R25/00H04B15/00
    • H04R25/453H04R5/033
    • A method of estimating acoustic feedback in a hearing instrument in order to reduce the impact of tonal components of acoustic feedback. The hearing instrument comprises an input transducer, an output transducer, a forward path being defined between the input transducer and the output transducer, a signal processing unit defining an input side and an output side of the forward path, and a feedback loop from the output side to the input side. The feedback loop comprises a feedback path estimation unit receiving first and second estimation input signals from the input and output side of the forward path, respectively, wherein the first and second estimation input signal paths comprise first and second long term prediction filters P(z), the feedback cancellation system being adapted to provide that the variable parameters of at least one of the long term prediction filters are estimated based on the filter input signal.
    • 一种在听力仪器中估计声反馈以减少声反馈的音调分量的影响的方法。 听力仪器包括输入换能器,输出换能器,在输入换能器和输出换能器之间定义的前进路径,定义前进路径的输入侧和输出侧的信号处理单元,以及来自输出的反馈回路 侧到输入端。 反馈回路包括反馈路径估计单元,分别从前向通路的输入和输出侧接收第一和第二估计输入信号,其中第一和第二估计输入信号路径包括第一和第二长期预测滤波器P(z) 反馈消除系统适于提供基于滤波器输入信号来估计长期预测滤波器中的至少一个的可变参数。
    • 10. 发明授权
    • Spectral content modification for robust feedback channel estimation
    • 用于鲁棒反馈信道估计的频谱内容修改
    • US08422707B2
    • 2013-04-16
    • US12506424
    • 2009-07-21
    • Thomas Bo ElmedybJesper Jensen
    • Thomas Bo ElmedybJesper Jensen
    • H04R25/00H04B15/00
    • H04R25/353H04R25/453
    • A listening device includes an input and output transducers and a forward path defined between the transducers. The forward path may include a signal processing unit processing an SPU-input signal originating from the electric input signal in a time-frequency representation having successive time frames each having a frequency spectrum of the signal in the time frame in question. The signal processing unit includes a spectral content modification unit to modify values of the signal of one or more regions of the frequency spectrum of a given time frame so that the modified values are less correlated to the corresponding time-frequency regions of the input signal. A feedback path estimation unit is uses he improved processed output signal in the feedback estimation. The spectral content modification unit may base the modification on a model of the human auditory system so that the modifications are not perceptible by the user.
    • 聆听装置包括输入和输出换能器以及在换能器之间限定的前进路径。 前向路径可以包括信号处理单元,其处理来自电输入信号的SPU输入信号,时间频率表示具有连续的时间帧,每个时间帧在所讨论的时间帧中具有该信号的频谱。 信号处理单元包括频谱内容修改单元,用于修改给定时间帧的频谱的一个或多个区域的信号的值,使得修改值与输入信号的对应的时间 - 频率区域相关性较小。 反馈路径估计单元在反馈估计中使用他改进的经处理的输出信号。 光谱内容修改单元可以将修改基于人类听觉系统的模型,使得修改不被用户感知。