公开(公告)号：EP0721178A3

公开(公告)日：1998-12-09

申请号：EP96300078

申请日：1996-01-04

申请人： DIGISONIX INC

发明人： ERIKSSON LARRY J ,  BREMIGAN CARY D

IPC分类号： G10K11/178

CPC分类号： G10K11/178 ,  G10K2210/108 ,  G10K2210/128 ,  G10K2210/3012 ,  G10K2210/3019 ,  G10K2210/3027 ,  G10K2210/3042 ,  G10K2210/505

摘要： A multi-channel communication system is provided. In an active acoustic attenuation implementation, noise, including cross-coupled noise between channels and locations, designated audio signals, and echoes, are canceled, but not speech from another location. A particularly desirable vehicle application is provided.

公开(公告)号：EP0627825A2

公开(公告)日：1994-12-07

申请号：EP94108319.8

申请日：1994-05-30

申请人： NEC CORPORATION

发明人： Hirano, Akihiro, c/o NEC CORPORATION

IPC分类号： H04B3/23 ,  H04M3/56 ,  H04M9/08

CPC分类号： G10K11/178 ,  G10K2210/108 ,  G10K2210/3012 ,  G10K2210/505 ,  H04M9/082

摘要： The present invention relates to a multi-channel echo cancelling art enabling proper operation even if using a microphone not generating propagation delay difference between channels.
The present invention comprises: a step of calculating a power of reception signal in each reception channel and selecting a reception channel of a reception signal having the biggest power; a step of generating an echo replica corresponding to an echo in each mixed signal generated by propagation of reception signals of the reception channels based on a reception signal of the reception channel selected in the previous step; and a step of cancelling the echoes from mixed signals in which the echoes are mixed by subtracting the echo replicas from the mixed signals.

摘要翻译： 本发明涉及即使使用不产生通道之间的传播延迟差的麦克风也能够适当操作的多通道回波消除技术。 本发明包括：计算每个接收信道中的接收信号的功率并选择具有最大功率的接收信号的接收信道的步骤; 基于在前一步骤中选择的接收信道的接收信号，生成通过接收信道的接收信号的传播产生的每个混合信号中与回波相对应的回波复制品的步骤; 以及通过从混合信号中减去回波复制品来消除来自混合回波的混合信号的回波的步骤。

公开(公告)号：EP0091926A1

公开(公告)日：1983-10-26

申请号：EP82903154.0

申请日：1982-10-21

申请人： SOUND ATTENUATORS LIMITED

发明人： CHAPLIN, George Brian Barrie ,  SMITH, Roderick Alan

IPC分类号： F16F15 ,  G10K11

CPC分类号： F16F15/02 ,  G10K11/178 ,  G10K2210/112 ,  G10K2210/3019 ,  G10K2210/30232 ,  G10K2210/3025 ,  G10K2210/3045 ,  G10K2210/3046 ,  G10K2210/505

摘要： PCT No. PCT/GB82/00299 Sec. 371 Date Jun. 17, 1983 Sec. 102(e) Date Jun. 17, 1983 PCT Filed Oct. 21, 1982 PCT Pub. No. WO83/01525 PCT Pub. Date Apr. 28, 1983.Methods and apparatus for cancelling both random and repetitive vibrations in gases, liquids or solids. The invention relies on generating cancelling vibrations (S) for a primary vibration to be nulled (P) by operating at discrete locations in the frequency domain of time samples of the waveform of the primary vibration. The cancelling vibrations required are generated by transforming (at 15) the sensed residual vibrations into a plurality of pairs of components which together define the residual vibrations at a plurality of different locations in the frequency domain, separately modifying (at 17) the independent components and then transforming (at 20) the modified components back into a drive signal for the source (12) of the cancelling vibrations.

公开(公告)号：EP2733957B1

公开(公告)日：2018-03-28

申请号：EP13193065.3

申请日：2013-11-15

申请人： BITwave Pte Ltd.

发明人： Hui, Siew Kok ,  Tan, Eng Sui

IPC分类号： H04R5/033 ,  G08G1/0965 ,  H04R1/40 ,  G10L21/00

CPC分类号： H04R5/0335 ,  G08B3/00 ,  G08G1/0965 ,  G10K11/178 ,  G10K2210/1081 ,  G10K2210/3014 ,  G10K2210/3046 ,  G10K2210/505 ,  G10L21/00 ,  H04R1/406 ,  H04R5/033

摘要： Boomless-microphones are described for a wireless helmet communicator with siren signal detection and classification capabilities. An acoustic component receives an audio signal and comprises a left acoustic sensor and a right acoustic sensor. The left acoustic sensor is mountable or attachable to the surface of a left wall of a helmet and the right acoustic sensor is mountable or attachable to the surface of a right wall. A speaker component can generate an echoless audio signal via signal inversion of the audio signal, outputs to a left speaker mountable or attachable to a left ear area of the helmet and a right speaker mountable or attachable to a right ear area of the helmet. A signal enhancement component can increase an intensity of the first audio signal associated with an emergency siren based on a determined proximity of an emitting emergency vehicle or emergency object to the device.

公开(公告)号：EP2905778A4

公开(公告)日：2015-11-25

申请号：EP13845843

申请日：2013-06-04

申请人： HUAWEI TECH CO LTD

发明人： ZHAN WUZHOU

IPC分类号： H04M9/08

CPC分类号： G10K11/175 ,  G10K2210/505 ,  H04M9/082

摘要： An echo cancelation method is disclosed. The method includes: dividing a to-be-processed audio signal into a to-be-processed high-band audio signal and a to-be-processed low-band audio signal; performing, by using an AEC module, adaptive filtering echo cancelation processing on the to-be-processed low-band audio signal, and skipping performing adaptive filtering echo cancelation processing on the to-be-processed high-band audio signal, to generate a preliminary echo cancelation signal; performing, by using an RES module, envelope prediction echo suppression on a high-band signal in a preliminary echo cancelation frequency domain signal, and calculating and outputting a residual echo suppression coefficient; performing, by using the RES module, echo suppression on a low-band signal in a preliminary echo cancelation frequency domain signal, and outputting a processing result; and multiplying the output result and the residual echo suppression coefficient, and outputting a signal of which echoes are canceled. In addition, an echo cancelation device is provided. In the embodiments of the present invention, high-band processing and low-band processing are separately performed on a to-be-processed signal, thereby not only effectively reducing a calculation amount of echo cancelation, but also solving a problem of echo leakage existing on sub-band edges in the prior art.

摘要翻译： 公开了一种回波消除方法。 该方法包括：将要处理的音频信号划分成要处理的高频带音频信号和待处理的低频带音频信号; 通过使用AEC模块对待处理的低频带音频信号执行自适应滤波回声消除处理，并且跳过对待处理的高频带音频信号执行自适应滤波回声消除处理，以产生 初步回波消除信号; 通过使用RES模块对初步回波消除频域信号中的高频带信号进行包络预测回波抑制，并计算并输出残差回波抑制系数; 通过使用RES模块，在初步回波消除频域信号中对低频带信号进行回波抑制，并输出处理结果; 并将输出结果与残差回波抑制系数进行相乘，输出回波消除的信号。 另外，提供了一种回波消除装置。 在本发明的实施例中，对被处理信号分别执行高频带处理和低频带处理，不仅有效地减少了回波消除的计算量，还解决了存在的回波泄漏的问题 在现有技术的子带边缘上。

公开(公告)号：EP2905778A1

公开(公告)日：2015-08-12

申请号：EP13845843.5

申请日：2013-06-04

申请人： Huawei Technologies Co., Ltd.

发明人： ZHAN, Wuzhou

IPC分类号： G10L21/02

CPC分类号： G10K11/175 ,  G10K2210/505 ,  H04M9/082

摘要： An echo cancelation method is disclosed. The method includes: dividing a to-be-processed audio signal into a to-be-processed high-band audio signal and a to-be-processed low-band audio signal; performing, by using an AEC module, adaptive filtering echo cancelation processing on the to-be-processed low-band audio signal, and skipping performing adaptive filtering echo cancelation processing on the to-be-processed high-band audio signal, to generate a preliminary echo cancelation signal; performing, by using an RES module, envelope prediction echo suppression on a high-band signal in a preliminary echo cancelation frequency domain signal, and calculating and outputting a residual echo suppression coefficient; performing, by using the RES module, echo suppression on a low-band signal in a preliminary echo cancelation frequency domain signal, and outputting a processing result; and multiplying the output result and the residual echo suppression coefficient, and outputting a signal of which echoes are canceled. In addition, an echo cancelation device is provided. In the embodiments of the present invention, high-band processing and low-band processing are separately performed on a to-be-processed signal, thereby not only effectively reducing a calculation amount of echo cancelation, but also solving a problem of echo leakage existing on sub-band edges in the prior art.

摘要翻译： 公开了一种回声消除方法。 该方法包括：将待处理音频信号划分为待处理高频音频信号和待处理低频音频信号; 通过AEC模块对待处理的低频音频信号进行自适应滤波回声消除处理，并跳过对待处理的高频音频信号进行自适应滤波回声消除处理，生成 初步回声消除信号; 通过RES模块对初步回声消除频域信号中的高频带信号进行包络预测回声抑制，并计算并输出残留回声抑制系数; 通过RES模块对初步回声消除频域信号中的低频信号进行回声抑制，并输出处理结果; 并且将输出结果与残留回声抑制系数相乘，并输出消除了回声的信号。 另外，提供回声消除设备。 在本发明实施例中，对待处理信号分别进行高带处理和低带处理，不仅有效降低了回声消除的计算量，而且还解决了存在回声泄露的问题 在现有技术的子带边缘上。

公开(公告)号：EP2847760A2

公开(公告)日：2015-03-18

申请号：EP13721165.2

申请日：2013-04-18

申请人： Cirrus Logic, Inc.

发明人： ALDERSON, Jeffrey ,  HENDRIX, Jon, D. ,  LU, Yang

IPC分类号： G10K11/178

CPC分类号： G10K11/16 ,  G10K11/17819 ,  G10K11/17833 ,  G10K11/17881 ,  G10K11/17885 ,  G10K2210/108 ,  G10K2210/3023 ,  G10K2210/3055 ,  G10K2210/503 ,  G10K2210/505 ,  G10K2210/506

摘要： A personal audio device, such as a wireless telephone, generates an anti-noise signal from a microphone signal and injects the anti-noise signal into the speaker or other transducer output to cause cancellation of ambient audio sounds. The microphone measures the ambient environment, but also contains a component due to the transducer acoustic output. An adaptive filter is used to estimate the electro-acoustical path from the noise-canceling circuit through the transducer to the at least one microphone so that source audio can be removed from the microphone signal. A determination of the relative amount of the ambient sounds present in the microphone signal versus the amount of the transducer output of the source audio present in the microphone signal is made to determine whether to update the adaptive response.

公开(公告)号：EP0627825A3

公开(公告)日：1998-04-01

申请号：EP94108319

申请日：1994-05-30

申请人： NEC CORP

发明人： HIRANO AKIHIRO

IPC分类号： H04B3/23 ,  G10K11/178 ,  H04M9/08 ,  H04M3/56

CPC分类号： G10K11/178 ,  G10K2210/108 ,  G10K2210/3012 ,  G10K2210/505 ,  H04M9/082

摘要： The present invention relates to a multi-channel echo cancelling art enabling proper operation even if using a microphone not generating propagation delay difference between channels.
The present invention comprises: a step of calculating a power of reception signal in each reception channel and selecting a reception channel of a reception signal having the biggest power; a step of generating an echo replica corresponding to an echo in each mixed signal generated by propagation of reception signals of the reception channels based on a reception signal of the reception channel selected in the previous step; and a step of cancelling the echoes from mixed signals in which the echoes are mixed by subtracting the echo replicas from the mixed signals.

公开(公告)号：EP0091926B1

公开(公告)日：1987-08-26

申请号：EP82903154.1

申请日：1982-10-21

申请人： SOUND ATTENUATORS LIMITED

发明人： CHAPLIN, George Brian Barrie ,  SMITH, Roderick Alan

IPC分类号： G10K11/16

CPC分类号： F16F15/02 ,  G10K11/178 ,  G10K2210/112 ,  G10K2210/3019 ,  G10K2210/30232 ,  G10K2210/3025 ,  G10K2210/3045 ,  G10K2210/3046 ,  G10K2210/505

摘要： PCT No. PCT/GB82/00299 Sec. 371 Date Jun. 17, 1983 Sec. 102(e) Date Jun. 17, 1983 PCT Filed Oct. 21, 1982 PCT Pub. No. WO83/01525 PCT Pub. Date Apr. 28, 1983.Methods and apparatus for cancelling both random and repetitive vibrations in gases, liquids or solids. The invention relies on generating cancelling vibrations (S) for a primary vibration to be nulled (P) by operating at discrete locations in the frequency domain of time samples of the waveform of the primary vibration. The cancelling vibrations required are generated by transforming (at 15) the sensed residual vibrations into a plurality of pairs of components which together define the residual vibrations at a plurality of different locations in the frequency domain, separately modifying (at 17) the independent components and then transforming (at 20) the modified components back into a drive signal for the source (12) of the cancelling vibrations.

公开(公告)号：EP0104660A3

公开(公告)日：1985-05-22

申请号：EP83109708

申请日：1983-09-28

申请人： NEC CORPORATION

发明人： Ito, Yoshinori

IPC分类号： H04B03/23

CPC分类号： G10K11/178 ,  G10K2210/30351 ,  G10K2210/3045 ,  G10K2210/505 ,  H04B3/23

摘要： In a self-adaptive echo canceller responsive to a receive-in signal and an echo signal resulting from the receive-in signal, a learning identification technique is implemented so as to exempt a send-out signal from the echo signal by successively varying an amount of modification (Δhj') represented by βeX, where represents a coefficient; e, a level of the send-out signal; and X, a level of the receive-in signal. A coefficient calculating circuit (28, 30, 35) calculates the coefficient from the factor and an incoming level (X) of the receive-in signal to determine the amount of modification. The coefficient is accompanied by a modifier given by 2X 2 /(K + X 2 ), where K represents a constant. The coefficient calculating circuit includes a unit (35) for calculating the modifier. The modifier may be multiplied by various factors of the amount of modification.