公开(公告)号：US08767974B1

公开(公告)日：2014-07-01

申请号：US11153673

申请日：2005-06-15

申请人： Youhong Lu ,  Ronald Fowler ,  Robert McGurrin ,  Jenny Q. Jin

发明人： Youhong Lu ,  Ronald Fowler ,  Robert McGurrin ,  Jenny Q. Jin

IPC分类号： H04R3/02 ,  H04B15/00 ,  H03G3/20

CPC分类号： G10L19/012

摘要： Comfort noise, such as can be used in voice communications can be generated using methods in the frequency domain and/or in the time domain. In various embodiments, a comfort noise spectrum can be generated in the frequency domain as the product of a background noise sample and a random noise sample. In other embodiments, the comfort noise can be generated directly in the time domain as the convolution of a background noise sample and a random noise sample.

摘要翻译： 可以使用频域和/或时域中的方法来产生诸如可用于语音通信中的舒适噪声。 在各种实施例中，可以在频域中产生舒适噪声频谱，作为背景噪声样本和随机噪声样本的乘积。 在其他实施例中，可以在时域中直接生成舒适噪声，作为背景噪声样本和随机噪声样本的卷积。

公开(公告)号：US06873701B1

公开(公告)日：2005-03-29

申请号：US09821409

申请日：2001-03-29

申请人： Wenshun Tian ,  Youhong Lu

发明人： Wenshun Tian ,  Youhong Lu

IPC分类号： H04M1/50 ,  H04Q1/457

CPC分类号： H04Q1/4575

摘要： A system and method for determining DTMF coefficients stores a plurality of reference templates, at least some of said reference templates representative of likelihood ratios. A plurality of LPC coefficients is received. The LPC coefficients are representative of an input signal. The system and method determines a plurality of current likelihood ratios based, at least in part, upon the LPC coefficients. The system and method also determines an initial tone based, at least in part, on the minimum of the current likelihood ratios and the minimum of the reference likelihood ratios. A plurality of LSF coefficients is received. The LSF coefficients are determined, at least in part, upon the input signal. The system and method verifies the validity of the initial tone based, at least in part, upon the LSF coefficients.

摘要翻译： 用于确定DTMF系数的系统和方法存储多个参考模板，表示似然比的至少一些所述参考模板。 接收多个LPC系数。 LPC系数代表输入信号。 该系统和方法至少部分地基于LPC系数确定多个当前似然比。 系统和方法还基于至少部分地基于当前似然比的最小值和参考似然比的最小值来确定初始音调。 接收多个LSF系数。 LSF系数至少部分地基于输入信号来确定。 该系统和方法至少部分地基于LSF系数验证初始音调的有效性。

公开(公告)号：US20120250871A1

公开(公告)日：2012-10-04

申请号：US13431662

申请日：2012-03-27

申请人： Youhong Lu ,  Trausti Thormundsson

发明人： Youhong Lu ,  Trausti Thormundsson

IPC分类号： H04B3/20

CPC分类号： H04M9/082 ,  G10K11/16 ,  G10K2210/505 ,  H04B3/23

摘要： Presented is a method and associated system for suppression of linear and nonlinear echo. The method includes dividing an input signal into several frequency bands in each of a several of time frames. The input signal may include an echo signal. The method further includes multiplying the input signal in each of the several frequency bands by a corresponding echo suppression signal. Calculating the corresponding echo suppression signal may include estimating a power of the echo signal in a particular frequency band as a sum of several component echo powers, each of the several component echo powers due to an excitation from a far-end signal in a corresponding one of the several frequency bands. Calculating the corresponding echo suppression signal may further include subtracting the power of the echo signal in the particular frequency band from a power of the input signal in the particular frequency band.

摘要翻译： 提出了一种用于抑制线性和非线性回波的方法和相关系统。 该方法包括在几个时间帧的每一个中将输入信号划分成多个频带。 输入信号可以包括回波信号。 该方法还包括将相应的回波抑制信号乘以多个频带中的每一个中的输入信号。 计算相应的回波抑制信号可以包括：将特定频带内的回波信号的功率估计为若干分量回波功率之和，由于对应的一个远端信号的激励导致的几个分量回波功率中的每一个 的几个频带。 计算相应的回波抑制信号还可以包括从特定频带中的输入信号的功率中减去特定频带中的回波信号的功率。

公开(公告)号：US07570608B2

公开(公告)日：2009-08-04

申请号：US11337777

申请日：2006-01-23

申请人： Youhong Lu

发明人： Youhong Lu

IPC分类号： H04B3/20 ,  H04L12/56

CPC分类号： H04B3/23

摘要： A method and system receives a far-end signal and determines whether the far-end signal is representative of a modulated signal. The method and system also receives a near-end signal and determines whether the near-end signal is representative of a modulated signal. Predetermined characteristics of the near and far-end signals are determined as is whether the echo canceller will converge for the far-end signal. The operation of the echo canceller is controlled in response to the determination of the predetermined conditions and in response the determination of whether the far-end and near-end signals are modulated signals.

摘要翻译： 方法和系统接收远端信号并确定远端信号是否表示调制信号。 该方法和系统还接收近端信号，并确定近端信号是否代表调制信号。 确定近端和远端信号的预定特性是否回波消除器将会收敛到远端信号。 响应于预定条件的确定并响应于远端和近端信号是否是调制信号的确定来控制回声消除器的操作。

公开(公告)号：US06711259B1

公开(公告)日：2004-03-23

申请号：US09444638

申请日：1999-11-22

申请人： Raziel Haimi-Cohen ,  Youhong Lu

发明人： Raziel Haimi-Cohen ,  Youhong Lu

IPC分类号： H04M100

CPC分类号： H04M1/585 ,  H04M1/6008 ,  H04M1/72519 ,  H04M9/08

摘要： An audio processing module, in accordance with the invention, includes an input for receiving input signals. A side tone generator is included for receiving the input signals and for generating a side tone to be output. A noise suppressor is coupled to the input for suppressing noise of the input signal prior to a coding process, the noise suppressor providing feedback to the side tone generator to adjust a gain of the input signal to the output. A method for adjusting the gain of the side tone generator is also included.

摘要翻译： 根据本发明的音频处理模块包括用于接收输入信号的输入。 包括侧音发生器用于接收输入信号并产生要输出的侧音。 噪声抑制器耦合到输入端，用于在编码处理之前抑制输入信号的噪声，噪声抑制器向侧音发生器提供反馈以调整输入信号对输出的增益。 还包括用于调节侧音发生器的增益的方法。

公开(公告)号：US20160006880A1

公开(公告)日：2016-01-07

申请号：US14321811

申请日：2014-07-02

申请人： Youhong Lu ,  Syavosh Zad Issa

发明人： Youhong Lu ,  Syavosh Zad Issa

IPC分类号： H04M9/08

CPC分类号： H04M9/082 ,  G10L21/0208 ,  H03H2021/0078 ,  H04B3/23 ,  H04B3/234 ,  H04M3/002 ,  H04M9/085

摘要： Examples of the disclosure provide variable step size (VSS) adaptive echo cancellation in the presence of near-end noise such as dense double talk without using an explicit double talk detector and/or without using a dual-filter. During a conversation, the present value for an error signal is monitored. Based on the monitored present value for the error signal, a first function is determined. A second function is determined based on long-term statistics describing a reference signal, a near-end noise signal, and the error signal. An adaptation coefficient is calculated for the VSS adaptive filter based on the determined first function and the determined second function. The calculated adaptation coefficient is used in the VSS adaptive filter for echo cancellation against interference due to the near-end noise signal during the conversation.

摘要翻译： 本公开的示例在不使用显式双通话检测器和/或不使用双滤波器的情况下，在诸如密集双重通话的近端噪声的存在下提供可变步长（VSS）自适应回波消除。 在对话期间，监视错误信号的当前值。 基于所监视的误差信号的当前值，确定第一功能。 基于描述参考信号，近端噪声信号和误差信号的长期统计来确定第二功能。 基于确定的第一功能和确定的第二功能，为VSS自适应滤波器计算适应系数。 计算出的自适应系数用于VSS自适应滤波器，用于在对话期间由于近端噪声信号而导致的干扰回波消除。

公开(公告)号：US20110170683A1

公开(公告)日：2011-07-14

申请号：US12684829

申请日：2010-01-08

申请人： Youhong Lu ,  Trausti Thormundsson ,  Yair Kerner ,  Ragnar H. Jonsson

发明人： Youhong Lu ,  Trausti Thormundsson ,  Yair Kerner ,  Ragnar H. Jonsson

IPC分类号： H04M9/08

CPC分类号： H04M3/002 ,  H04M9/082

摘要： Traditionally, echo cancellation has employed linear adaptive filters to cancel echoes in a two way communication system. The rate of adaptation is often dynamic and varies over time. Disclosed are novel rates of adaptation that perform well in the presence of background noise, during double talk and with echo path changes. Additionally, the echo or residual echo can further be suppressed with non-linear processing performed using joint frequency-time domain processing.

摘要翻译： 传统上，回波消除采用线性自适应滤波器来消除双向通信系统中的回波。 适应率通常是动态的，随时间而变化。 公开了在双重通话期间和具有回波路径改变的情况下，在背景噪声的存在下表现良好的适应性适应性。 此外，通过使用联合频域处理执行的非线性处理，可进一步抑制回波或残留回波。

公开(公告)号：US06590972B1

公开(公告)日：2003-07-08

申请号：US09809559

申请日：2001-03-15

申请人： Youhong Lu ,  Wenshun Tian

发明人： Youhong Lu ,  Wenshun Tian

IPC分类号： H04M100

CPC分类号： H04Q1/4575

摘要： A system and method for DTMF tone detection receives an input signal. The input signal includes a DTMF tone. The DTMF tone has a first frequency and a second frequency. An initial first frequency and an initial second frequency of said DTMF tone are selected by calculating a plurality of cost functions. The initial first frequency is confirmed to be the first frequency and the initial second frequency is confirmed to be the second frequency using re-computed values of the plurality of cost functions.

摘要翻译： 用于DTMF音检测的系统和方法接收输入信号。 输入信号包括DTMF音。 DTMF音具有第一频率和第二频率。 通过计算多个成本函数来选择所述DTMF音的初始第一频率和初始第二频率。 初始第一频率被确认为第一频率，并且使用多个成本函数的重新计算的值确认初始第二频率是第二频率。

公开(公告)号：US09049281B2

公开(公告)日：2015-06-02

申请号：US13431662

申请日：2012-03-27

申请人： Youhong Lu ,  Trausti Thormundsson

发明人： Youhong Lu ,  Trausti Thormundsson

IPC分类号： H04B3/20 ,  H04M9/08 ,  H04B3/23 ,  G06F17/00

CPC分类号： H04M9/082 ,  G10K11/16 ,  G10K2210/505 ,  H04B3/23

摘要： Presented is a method and associated system for suppression of linear and nonlinear echo. The method includes dividing an input signal into several frequency bands in each of a several of time frames. The input signal may include an echo signal. The method further includes multiplying the input signal in each of the several frequency bands by a corresponding echo suppression signal. Calculating the corresponding echo suppression signal may include estimating a power of the echo signal in a particular frequency band as a sum of several component echo powers, each of the several component echo powers due to an excitation from a far-end signal in a corresponding one of the several frequency bands. Calculating the corresponding echo suppression signal may further include subtracting the power of the echo signal in the particular frequency band from a power of the input signal in the particular frequency band.

摘要翻译： 提出了一种用于抑制线性和非线性回波的方法和相关系统。 该方法包括在几个时间帧的每一个中将输入信号划分成多个频带。 输入信号可以包括回波信号。 该方法还包括将相应的回波抑制信号乘以多个频带中的每一个中的输入信号。 计算相应的回波抑制信号可以包括：将特定频带内的回波信号的功率估计为若干分量回波功率之和，由于对应的一个远端信号的激励导致的几个分量回波功率中的每一个 的几个频带。 计算相应的回波抑制信号还可以包括从特定频带中的输入信号的功率中减去特定频带中的回波信号的功率。

公开(公告)号：US08634569B2

公开(公告)日：2014-01-21

申请号：US12684829

申请日：2010-01-08

申请人： Youhong Lu ,  Trausti Thormundsson ,  Yair Kerner ,  Ragnar H. Jonsson

发明人： Youhong Lu ,  Trausti Thormundsson ,  Yair Kerner ,  Ragnar H. Jonsson

IPC分类号： H04B3/20

CPC分类号： H04M3/002 ,  H04M9/082

摘要： Traditionally, echo cancellation has employed linear adaptive filters to cancel echoes in a two way communication system. The rate of adaptation is often dynamic and varies over time. Disclosed are novel rates of adaptation that perform well in the presence of background noise, during double talk and with echo path changes. Additionally, the echo or residual echo can further be suppressed with non-linear processing performed using joint frequency-time domain processing.

摘要翻译： 传统上，回波消除采用线性自适应滤波器来消除双向通信系统中的回波。 适应率通常是动态的，随时间而变化。 公开了在双重通话期间和具有回波路径改变的情况下，在背景噪声的存在下表现良好的适应性适应性。 此外，通过使用联合频域处理执行的非线性处理，可进一步抑制回波或残留回波。