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1. 发明授权

US08483398B2 Methods and systems for reducing acoustic echoes in multichannel communication systems by reducing the dimensionality of the space of impulse responses 有权
标题翻译：通过降低脉冲响应空间的维度来减少多通道通信系统中的声学回波的方法和系统
公开(公告)号：US08483398B2
公开(公告)日：2013-07-09
申请号：US12387351
申请日：2009-04-30
申请人： Majid Fozunbal , Ronald W. Schafer
发明人： Majid Fozunbal , Ronald W. Schafer
IPC分类号： H04B3/20 , H04B15/00 , H04M9/08
CPC分类号： H04M9/082
摘要： Various embodiments of the present invention are directed to adaptive methods for reducing acoustic echoes in multichannel audio communication systems. Acoustic echo cancellation methods determine approximate impulse responses characterizing each echo path between loudspeakers and microphones within a room and improve performance based on previously determined impulse responses. In particular, the methods adapt to changes in the room by inferring approximate impulse responses that lie within a model of an impulse response space. Over time the method improves performance by evolving the model into a more accurate space from which to select subsequent approximate impulse responses.
摘要翻译：本发明的各种实施例涉及用于减少多声道音频通信系统中的声学回波的自适应方法。声回波消除方法确定表征房间内扬声器和麦克风之间的每个回波路径的近似脉冲响应，并且基于先前确定的脉冲响应提高性能。特别地，该方法通过推断位于脉冲响应空间的模型内的近似脉冲响应来适应房间的变化。随着时间的推移，该方法通过将模型演变为更准确的空间来提高性能，从中选择随后的近似脉冲响应。

2. 发明授权

US08218780B2 Methods and systems for blind dereverberation 有权
标题翻译：盲目混响的方法和系统
公开(公告)号：US08218780B2
公开(公告)日：2012-07-10
申请号：US12484686
申请日：2009-06-15
申请人： Thomas Anthony Baran , Bowon Lee , Ronald W. Schafer , Majid Fozunbal
发明人： Thomas Anthony Baran , Bowon Lee , Ronald W. Schafer , Majid Fozunbal
IPC分类号： H04B3/20 , H03G3/00
CPC分类号： H04M9/082
摘要： Various embodiments of the present invention are directed to methods for dereverberation of audio generated in a room. In one aspect, a method for dereverberating reverberant digital signals comprises transforming a reverberant digital signal from the time domain into Fourier domain signals using a computing device, each Fourier domain signal corresponding to a subband. For each subband of the Fourier domain signal, the method computes autoregressive model coefficients of the reverberation with the current and previous magnitudes of the Fourier digital signal, and inverse filters the magnitude of the Fourier domain signal using the computing device, based on the autoregressive model coefficients and previous magnitudes of the Fourier digital signal. The method includes inverse transforming the Fourier domain signals with filtered magnitudes into an approximate dereverberated digital signal.
摘要翻译：本发明的各种实施例涉及用于在室内产生的音频的混响的方法。一方面，一种用于去混响混响数字信号的方法包括使用计算装置将混响数字信号从时域变换成傅立叶域信号，每个傅立叶域信号对应于子带。对于傅立叶域信号的每个子带，该方法利用傅里叶数字信号的当前和先前幅度来计算混响的自回归模型系数，并且使用计算装置基于自回归模型对傅立叶域信号的幅度进行滤波傅里叶数字信号的系数和先前幅度。该方法包括将具有滤波幅度的傅立叶域信号逆变换为近似的非反相数字信号。

3. 发明申请

US20100316228A1 METHODS AND SYSTEMS FOR BLIND DEREVERBERATION 有权
标题翻译： BLIND DEREVERBERATION的方法和系统
公开(公告)号：US20100316228A1
公开(公告)日：2010-12-16
申请号：US12484686
申请日：2009-06-15
申请人： Thomas Anthony Baran , Bowon Lee , Ronald W. Schafer , Majid Fozunbal
发明人： Thomas Anthony Baran , Bowon Lee , Ronald W. Schafer , Majid Fozunbal
IPC分类号： H04B3/20
CPC分类号： H04M9/082
摘要： Various embodiments of the present invention are directed to methods for dereverberation of audio generated in a room. In one aspect, a method for dereverberating reverberant digital signals comprises transforming a reverberant digital signal from the time domain into Fourier domain signals using a computing device, each Fourier domain signal corresponding to a subband. For each subband of the Fourier domain signal, the method computes autoregressive model coefficients of the reverberation with the current and previous magnitudes of the Fourier digital signal, and inverse filters the magnitude of the Fourier domain signal using the computing device, based on the autoregressive model coefficients and previous magnitudes of the Fourier digital signal. The method includes inverse transforming the Fourier domain signals with filtered magnitudes into an approximate dereverberated digital signal.
摘要翻译：本发明的各种实施例涉及用于在室内产生的音频的混响的方法。一方面，一种用于去混响混响数字信号的方法包括使用计算装置将混响数字信号从时域变换成傅立叶域信号，每个傅立叶域信号对应于子带。对于傅立叶域信号的每个子带，该方法利用傅里叶数字信号的当前和先前幅度来计算混响的自回归模型系数，并且使用计算装置基于自回归模型对傅立叶域信号的幅度进行滤波傅里叶数字信号的系数和先前幅度。该方法包括将具有滤波幅度的傅立叶域信号逆变换为近似的非反相数字信号。

4. 发明申请

US20100278351A1 Methods and systems for reducing acoustic echoes in multichannel communication systems by reducing the dimensionality of the space of impulse resopnses 有权
标题翻译：通过降低脉冲振荡空间的维度来减少多通道通信系统中的声学回波的方法和系统
公开(公告)号：US20100278351A1
公开(公告)日：2010-11-04
申请号：US12387351
申请日：2009-04-30
申请人： Majid Fozunbal , Ronald W. Schafer
发明人： Majid Fozunbal , Ronald W. Schafer
IPC分类号： H04B3/20
CPC分类号： H04M9/082
摘要： Various embodiments of the present invention are directed to adaptive methods for reducing acoustic echoes in multichannel audio communication systems. Acoustic echo cancellation methods determine approximate impulse responses characterizing each echo path between loudspeakers and microphones within a room and improve performance based on previously determined impulse responses. In particular, the methods adapt to changes in the room by inferring approximate impulse responses that lie within a model of an impulse response space. Over time the method improves performance by evolving the model into a more accurate space from which to select subsequent approximate impulse responses.
摘要翻译：本发明的各种实施例涉及用于减少多声道音频通信系统中的声学回波的自适应方法。声回波消除方法确定表征房间内扬声器和麦克风之间的每个回波路径的近似脉冲响应，并且基于先前确定的脉冲响应提高性能。特别地，该方法通过推断位于脉冲响应空间的模型内的近似脉冲响应来适应房间的变化。随着时间的推移，该方法通过将模型演变为更准确的空间来提高性能，从中选择随后的近似脉冲响应。

5. 发明申请

US20080091415A1 System and method for canceling acoustic echoes in audio-conference communication systems 审中-公开
标题翻译：用于消除音频会议通信系统中的声学回声的系统和方法
公开(公告)号：US20080091415A1
公开(公告)日：2008-04-17
申请号：US11546680
申请日：2006-10-12
申请人： Ronald W. Schafer
发明人： Ronald W. Schafer
IPC分类号： G10L19/00
CPC分类号： G10L19/0208 , G10L2021/02082
摘要： Various embodiments of the present invention are directed to a frequency-domain coder/decoder for an audio-conference communication system that includes acoustic-echo-cancellation functionality. In one embodiment of the present invention, an acoustic echo canceller is integrated into the frequency-domain coder/decoder and ameliorates or removes acoustic echoes from audio signals that have been transformed to the frequency domain and divided into subbands by the frequency-domain coder/decoder.
摘要翻译：本发明的各种实施例涉及用于音频会议通信系统的频域编码器/解码器，其包括声学回波消除功能。在本发明的一个实施例中，声学回波消除器被集成到频域编码器/解码器中，并且通过频域编码器/解码器改变或去除已经被变换到频域并且被分频成子带的音频信号的声学回波，解码器。

6. 发明授权

US06898756B1 System and method for enabling efficient error correction and encryption using wavelet transforms over finite fields 失效
标题翻译：用于通过有限域的小波变换实现有效的纠错和加密的系统和方法
公开(公告)号：US06898756B1
公开(公告)日：2005-05-24
申请号：US09268555
申请日：1999-03-15
申请人： Faramarz Fekri , Steven W. McLaughlin , Russell M. Mersereau , Ronald W. Schafer
发明人： Faramarz Fekri , Steven W. McLaughlin , Russell M. Mersereau , Ronald W. Schafer
IPC分类号： H03M13/00 , H03M13/03
CPC分类号： H03M13/134 , H03M13/00
摘要： A system and method for enabling efficient error correction and encryption using wavelet transforms over finite fields. The system and method utilizes the combination of a channel encoder and channel decoder to correct errors to source data after transmission over a physical channel or storage in a storage medium. The channel encoder mathematically generates a set of wavelet coefficients by performing a combination of filtering and/or processing of a received message vector. The wavelet coefficients are then utilized by the channel encoder to cause its filters to transform message data into transmission data. The channel decoder receives the transmitted source data in the form of a code word/channel error combination and performs filtering to render a syndrome, representative of the channel error. Analysis of the syndrome is performed to determine the actual error, which is utilized to derive the actual source data.
摘要翻译：一种使用有限域小波变换实现有效的纠错和加密的系统和方法。该系统和方法利用信道编码器和信道解码器的组合来在通过存储介质中的物理信道或存储器传输之后校正源数据的错误。信道编码器通过执行接收到的消息向量的过滤和/或处理的组合来数学地生成一组小波系数。然后，信道编码器利用小波系数使其滤波器将消息数据转换成传输数据。信道解码器以码字/信道错误组合的形式接收发送的源数据，并且执行滤波以表示信道错误。执行综合征的分析以确定用于导出实际源数据的实际误差。

7. 发明授权

US4284860A Time doman measurement of moving coil loudspeaker driver parameters 失效
标题翻译：动态线圈扬声器驱动器参数的时间测量
公开(公告)号：US4284860A
公开(公告)日：1981-08-18
申请号：US135085
申请日：1980-03-28
申请人： W. Marshall Leach, Jr. , Ronald W. Schafer
发明人： W. Marshall Leach, Jr. , Ronald W. Schafer
IPC分类号： H04R29/00
CPC分类号： H04R29/003
摘要： A novel method for the measurement of the Thiele-Small small-signal parameters of a moving-coil electromagnetic transducer driver is disclosed. The technique is based on a time domain analysis of the transient response of a loudspeaker voice coil circuit to a current step of excitation. By sampling the damped sinusoidal transient generated by such an excitation, the loud-speaker parameters can be calculated from a linear predictive analysis of the recorded data.
摘要翻译：公开了一种用于测量动圈式电磁换能器驱动器的Thiele-Small小信号参数的新颖方法。该技术基于对扬声器音圈电路到当前激励步骤的瞬态响应的时域分析。通过对由这种激励产生的阻尼正弦瞬态进行采样，可以从记录数据的线性预测分析中计算扬声器参数。

8. 发明授权

US08699637B2 Time delay estimation 有权
标题翻译：延时估计
公开(公告)号：US08699637B2
公开(公告)日：2014-04-15
申请号：US13204042
申请日：2011-08-05
申请人： Bowon Lee , Ronald W Schafer , Ton Kalker
发明人： Bowon Lee , Ronald W Schafer , Ton Kalker
IPC分类号： H03D1/00
CPC分类号： H04R3/005 , H04R2430/03 , H04R2430/20
摘要： A method for time delay estimation performed by a physical computing system includes passing a first input signal obtained by a first sensor through a filter bank to form a first set of sub-band output signals, passing a second input signal obtained by a second sensor through the filter bank to form a second set of sub-band output signals, the second sensor placed a distance from the first sensor, computing cross-correlation data between the first set of sub-band output signals and the second set of sub-band output signals, and applying a time delay determination function to the cross-correlation to determine a time delay estimation.
摘要翻译：由物理计算系统执行的用于时间延迟估计的方法包括将由第一传感器获得的第一输入信号通过滤波器组以形成第一组子带输出信号，将由第二传感器获得的第二输入信号通过所述滤波器组形成第二组子带输出信号，所述第二传感器与所述第一传感器放置一距离，计算所述第一组子带输出信号与所述第二组子带输出之间的互相关数据信号，并将时间延迟确定功能应用于互相关以确定时间延迟估计。

9. 发明申请

US20130034138A1 TIME DELAY ESTIMATION 有权
标题翻译：时间延迟估计
公开(公告)号：US20130034138A1
公开(公告)日：2013-02-07
申请号：US13204042
申请日：2011-08-05
申请人： Bowon Lee , Ronald W. Schafer , Ton Kalker
发明人： Bowon Lee , Ronald W. Schafer , Ton Kalker
IPC分类号： H04B17/00
CPC分类号： H04R3/005 , H04R2430/03 , H04R2430/20
摘要： A method for time delay estimation performed by a physical computing system includes passing a first input signal obtained by a first sensor through a filter bank to form a first set of sub-band output signals, passing a second input signal obtained by a second sensor through the filter bank to form a second set of sub-band output signals, the second sensor placed a distance from the first sensor, computing cross-correlation data between the first set of sub-band output signals and the second set of sub-band output signals, and applying a time delay determination function to the cross-correlation to determine a time delay estimation.
摘要翻译：由物理计算系统执行的用于时间延迟估计的方法包括将由第一传感器获得的第一输入信号通过滤波器组以形成第一组子带输出信号，将由第二传感器获得的第二输入信号通过所述滤波器组形成第二组子带输出信号，所述第二传感器与所述第一传感器放置一距离，计算所述第一组子带输出信号与所述第二组子带输出之间的互相关数据信号，并将时间延迟确定功能应用于互相关以确定时间延迟估计。

10. 发明授权

US06975756B1 Image-based photo hulls 失效
标题翻译：基于图像的照片船体
公开(公告)号：US06975756B1
公开(公告)日：2005-12-13
申请号：US10095661
申请日：2002-03-12
申请人： Gregory G. Slabaugh , Ronald W. Schafer , Mathieu C. Hans
发明人： Gregory G. Slabaugh , Ronald W. Schafer , Mathieu C. Hans
IPC分类号： G06K9/00
CPC分类号： G06T15/205
摘要： The invention features an improved, photo hull based method of generating a three-dimensional representation of a visual scene based upon a set of multi-view reference images. In one aspect, a visual hull containing the visual scene is computed. Visibility of points on the computed visual hull with respect to each reference image is computed. Photo-consistency of points on the computed visual hull along rays back-projected from a desired view is computed based upon reference images having visibility of the points. A photo hull containing the visual scene is generated by stepping along each back-projected ray. The photo-consistent points visible in the desired view are colored using color information contained in reference images having visibility of the photo-consistent points.
摘要翻译：本发明的特征在于基于一组多视图参考图像生成视觉场景的三维表示的改进的基于照片的船体的方法。在一个方面，计算包含视觉场景的视觉外壳。计算相对于每个参考图像的计算的视觉船体上的点的可见性。基于具有点的可视性的参考图像来计算沿着期望视点反投影的光线的计算的视觉船体上的点的一致性。包含视觉场景的照片船体通过沿着每个后投射的光线进行生成。在所需视图中可见的光一致点是使用包含在具有光一致点的可视性的参考图像中的颜色信息进行着色的。

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