公开(公告)号：US20110019831A1

公开(公告)日：2011-01-27

申请号：US12837658

申请日：2010-07-16

申请人： Encai LIU

发明人： Encai LIU

IPC分类号： H04B3/20

CPC分类号： H04M9/082

摘要： In an echo suppression apparatus, an adaptive filter estimates an echo path of a near end, and generates a pseudo echo signal of a reception signal received from a far end. A subtractor subtracts the pseudo echo signal from a near-end signal including an echo signal of the reception signal, a near-end sound and a background noise, thereby generating an echo-canceled signal. A background noise estimation unit estimates a spectrum of the background noise. A non-linear processing unit performs spectrum subtraction of the estimated spectrum of the background noise from the spectrum of the echo-canceled signal, and controls a gain of the spectrum of the echo-canceled signal in response to the result of the spectrum subtraction, thereby obtaining a spectrum of a transmission signal transmitted to the far end. A threshold calculation unit calculates a threshold value used to determine presence or absence of the residual echo in the echo-canceled signal. The non-linear processing unit compares the result of the spectrum subtraction with the threshold value, then controls the spectrum of the echo-canceled signal with a high gain in case that the result of the spectrum subtraction is higher than the threshold value, and with a low gain in case that the result of the spectrum subtraction is not higher than the threshold value.

摘要翻译： 在回波抑制装置中，自适应滤波器估计近端的回波路径，并且生成从远端接收的接收信号的伪回波信号。 减法器从包括接收信号的回波信号，近端声音和背景噪声的近端信号中减去伪回波信号，从而产生回波消除信号。 背景噪声估计单元估计背景噪声的频谱。 非线性处理单元根据回波消除信号的频谱对背景噪声的估计频谱进行频谱减法，并且响应于频谱减法的结果来控制回波消除信号的频谱的增益， 从而获得发送到远端的发送信号的频谱。 阈值计算单元计算用于确定回波消除信号中残留回波的存在或不存在的阈值。 非线性处理单元将频谱减法的结果与阈值进行比较，然后在频谱减法的结果高于阈值的情况下控制具有高增益的回波消除信号的频谱，并且与 在频谱减法的结果不高于阈值的情况下的低增益。

公开(公告)号：US08530736B2

公开(公告)日：2013-09-10

申请号：US13310099

申请日：2011-12-02

申请人： Encai Liu ,  Masatsugu Okazaki ,  Eiji Tominaga

发明人： Encai Liu ,  Masatsugu Okazaki ,  Eiji Tominaga

IPC分类号： G10H7/00

CPC分类号： G10H5/007

摘要： A musical tone signal is synthesized based on performance information to simulate a sound generated from a musical instrument having a string and a body that supports the string by a support. There is provided a closed loop circuit having a delay element that simulates delay characteristic of vibration propagated through the string and a characteristic control element that simulates a variation in amplitude or frequency. A string model calculation circuit inputs an excitation signal based on the performance information to the closed loop circuit, and calculates first information representing a force of the string acting on the support based on a cyclic signal generated in the closed loop and representing the vibration of the string circuit. A body model calculation circuit calculates second information representing a displacement of the body or a derivative of the displacement. A musical tone signal calculation circuit calculates the musical tone signal.

摘要翻译： 基于演奏信息合成乐音信号，以模拟由具有支撑弦支撑弦的乐器的乐器产生的声音。 提供了一种闭环电路，其具有模拟通过串传播的振动的延迟特性的延迟元件和模拟振幅或频率变化的特征控制元件。 串型计算电路基于性能信息将激励信号输入到闭环电路，并且基于在闭环中产生的循环信号计算表示作用在支架上的串的力的第一信息，并表示 串电路。 身体模型计算电路计算表示身体的位移或位移的导数的第二信息。 乐音信号计算电路计算乐音信号。

公开(公告)号：US08515098B2

公开(公告)日：2013-08-20

申请号：US12605291

申请日：2009-10-23

申请人： Encai Liu

发明人： Encai Liu

IPC分类号： H04B15/00 ,  G10L21/02

CPC分类号： G10L21/0208

摘要： In a noise suppression device, an audio detector detects presence or absence of audio in an input signal. A first noise spectrum estimator estimates a noise spectrum contained in the input signal based on the input signal and detection result of the audio detector. A second noise spectrum estimator estimates the noise spectrum based on the input signal regardless of the detection result of the audio detector. A noise spectrum calculator calculates a final noise spectrum estimation value according to a length of detecting time during which the audio detector continuously detects the audio and based on first and second noise spectrum estimation values that are obtained as estimation results by the first and second noise spectrum estimators. A gain calculator calculates a noise suppression gain based on the final noise spectrum estimation value. A noise suppressor suppresses noise contained in the input signal by applying the noise suppression gain to the input signal.

摘要翻译： 在噪声抑制装置中，音频检测器检测输入信号中是否存在音频。 第一噪声谱估计器基于输入信号和音频检测器的检测结果来估计包含在输入信号中的噪声谱。 无论音频检测器的检测结果如何，第二噪声谱估计器基于输入信号来估计噪声谱。 噪声频谱计算器根据音频检测器连续检测音频的检测时间的长度，并且基于通过第一和第二噪声谱作为估计结果获得的第一和第二噪声谱估计值，计算最终噪声谱估计值 估计者。 增益计算器基于最终噪声谱估计值计算噪声抑制增益。 噪声抑制器通过对输入信号施加噪声抑制增益来抑制输入信号中包含的噪声。

公开(公告)号：US20120137857A1

公开(公告)日：2012-06-07

申请号：US13310099

申请日：2011-12-02

申请人： Encai Liu ,  Masatsugu Okazaki ,  Eiji Tominaga

发明人： Encai Liu ,  Masatsugu Okazaki ,  Eiji Tominaga

IPC分类号： G10H7/00

CPC分类号： G10H5/007

摘要： A musical tone signal is synthesized based on performance information to simulate a sound generated from a musical instrument having a string and a body that supports the string by a support. There is provided a closed loop circuit having a delay element that simulates delay characteristic of vibration propagated through the string and a characteristic control element that simulates a variation in amplitude or frequency. A string model calculation circuit inputs an excitation signal based on the performance information to the closed loop circuit, and calculates first information representing a force of the string acting on the support based on a cyclic signal generated in the closed loop and representing the vibration of the string circuit. A body model calculation circuit calculates second information representing a displacement of the body or a derivative of the displacement. A musical tone signal calculation circuit calculates the musical tone signal.

摘要翻译： 基于演奏信息合成乐音信号，以模拟由具有支撑弦支撑弦的乐器的乐器产生的声音。 提供了一种闭环电路，其具有模拟通过串传播的振动的延迟特性的延迟元件和模拟振幅或频率变化的特征控制元件。 串型计算电路基于性能信息将激励信号输入到闭环电路，并且基于在闭环中产生的循环信号计算表示作用在支架上的串的力的第一信息，并表示 串电路。 身体模型计算电路计算表示身体的位移或位移的导数的第二信息。 乐音信号计算电路计算乐音信号。

公开(公告)号：US20100104113A1

公开(公告)日：2010-04-29

申请号：US12605291

申请日：2009-10-23

申请人： Encai LIU

发明人： Encai LIU

IPC分类号： H04B15/00

CPC分类号： G10L21/0208

摘要： In a noise suppression device, an audio detector detects presence or absence of audio in an input signal. A first noise spectrum estimator estimates a noise spectrum contained in the input signal based on the input signal and detection result of the audio detector. A second noise spectrum estimator estimates the noise spectrum based on the input signal regardless of the detection result of the audio detector. A noise spectrum calculator calculates a final noise spectrum estimation value according to a length of detecting time during which the audio detector continuously detects the audio and based on first and second noise spectrum estimation values that are obtained as estimation results by the first and second noise spectrum estimators. A gain calculator calculates a noise suppression gain based on the final noise spectrum estimation value. A noise suppressor suppresses noise contained in the input signal by applying the noise suppression gain to the input signal.

摘要翻译： 在噪声抑制装置中，音频检测器检测输入信号中是否存在音频。 第一噪声谱估计器基于输入信号和音频检测器的检测结果来估计包含在输入信号中的噪声谱。 无论音频检测器的检测结果如何，第二噪声谱估计器基于输入信号来估计噪声谱。 噪声频谱计算器根据音频检测器连续检测音频的检测时间的长度，并且基于通过第一和第二噪声谱作为估计结果获得的第一和第二噪声谱估计值，计算最终噪声谱估计值 估计量。 增益计算器基于最终噪声谱估计值计算噪声抑制增益。 噪声抑制器通过对输入信号施加噪声抑制增益来抑制输入信号中包含的噪声。

公开(公告)号：US08315380B2

公开(公告)日：2012-11-20

申请号：US12837658

申请日：2010-07-16

申请人： Encai Liu

发明人： Encai Liu

IPC分类号： H04M9/08

CPC分类号： H04M9/082

摘要： In an echo suppression apparatus, an adaptive filter estimates an echo path of a near end, and generates a pseudo echo signal of a reception signal received from a far end. A subtractor subtracts the pseudo echo signal from a near-end signal including an echo signal of the reception signal, a near-end sound and a background noise, thereby generating an echo-canceled signal. A background noise estimation unit estimates a spectrum of the background noise. A non-linear processing unit performs spectrum subtraction of the estimated spectrum of the background noise from the spectrum of the echo-canceled signal, and controls a gain of the spectrum of the echo-canceled signal in response to the result of the spectrum subtraction, thereby obtaining a spectrum of a transmission signal transmitted to the far end. A threshold calculation unit calculates a threshold value used to determine presence or absence of the residual echo in the echo-canceled signal. The non-linear processing unit compares the result of the spectrum subtraction with the threshold value, then controls the spectrum of the echo-canceled signal with a high gain in case that the result of the spectrum subtraction is higher than the threshold value, and with a low gain in case that the result of the spectrum subtraction is not higher than the threshold value.

摘要翻译： 在回波抑制装置中，自适应滤波器估计近端的回波路径，并且生成从远端接收的接收信号的伪回波信号。 减法器从包括接收信号的回波信号，近端声音和背景噪声的近端信号中减去伪回波信号，从而产生回波消除信号。 背景噪声估计单元估计背景噪声的频谱。 非线性处理单元根据回波消除信号的频谱对背景噪声的估计频谱进行频谱减法，并且响应于频谱减法的结果来控制回波消除信号的频谱的增益， 从而获得发送到远端的发送信号的频谱。 阈值计算单元计算用于确定回波消除信号中的残差回波的存在或不存在的阈值。 非线性处理单元将频谱减法的结果与阈值进行比较，然后在频谱减法的结果高于阈值的情况下控制具有高增益的回波消除信号的频谱，并且与 在频谱减法的结果不高于阈值的情况下的低增益。