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1. 再颁专利

USRE35574E Communication device apparatus and method utilizing pseudonoise signal for acoustical echo cancellation 失效
标题翻译：利用伪噪声信号进行回声消除的通信装置及方法
公开(公告)号：USRE35574E
公开(公告)日：1997-07-29
申请号：US447686
申请日：1995-05-23
申请人： Steve F. Russell , John F. Doherty
发明人： Steve F. Russell , John F. Doherty
IPC分类号： G10K11/178 , H04M9/08 , H04K1/02 , G10K11/16 , H04L27/30
CPC分类号： G10K11/178 , H04M9/082 , G10K2210/108 , G10K2210/3018 , G10K2210/30232 , G10K2210/3049 , G10K2210/505 , G10K2210/512
摘要： A communication device, an apparatus, and a method for acoustic echo cancellation which makes use of a pseudonoise signal. An audio mixer adds the pseudonoise signal to an input signal received from another communication device to produce a first composite signal. An audio system converts the first composite signal to sound in an at least partially enclosed space. The at least partially enclosed space produces an acoustical echo in response. The audio system then converts the acoustical echo and other sounds in the at least partially enclosed space to a second composite signal. A signal processor cross-correlates the second composite signal with the pseudonoise signal to produce an estimate of the overall impulse response of the combined system formed by the at least partially enclosed space and the audio system. The processor then convolves the first composite signal with the impulse response estimate to produce an echo estimation signal. The echo estimation signal is an estimate of the component of the second composite signal which corresponds to the acoustical echo. The processor then subtracts the echo estimation signal from the second composite signal to produce an output signal.
摘要翻译：一种使用伪噪声信号的通信设备，装置和用于声学回声消除的方法。音频混合器将伪噪声信号添加到从另一通信设备接收的输入信号以产生第一复合信号。音频系统将第一复合信号转换成至少部分封闭的空间中的声音。至少部分封闭的空间产生响应的声学回波。然后，音频系统将至少部分封闭空间中的声学回声和其他声音转换为第二复合信号。信号处理器将第二复合信号与伪噪声信号相互相关，以产生由至少部分封闭的空间和音频系统形成的组合系统的总脉冲响应的估计。然后处理器将第一复合信号与脉冲响应估计进行卷积，以产生回波估计信号。回波估计信号是对应于声学回波的第二复合信号的分量的估计。然后，处理器从第二复合信号中减去回波估计信号以产生输出信号。

2. 发明授权

US5327496A Communication device, apparatus, and method utilizing pseudonoise signal for acoustical echo cancellation 失效
标题翻译：利用伪噪声信号进行声学回波消除的通信装置，装置和方法
公开(公告)号：US5327496A
公开(公告)日：1994-07-05
申请号：US85749
申请日：1993-06-30
申请人： Steve F. Russell , John F. Doherty
发明人： Steve F. Russell , John F. Doherty
IPC分类号： G10K11/178 , H04M9/08 , H04K1/02 , G10K11/16 , H04L27/30
CPC分类号： G10K11/178 , H04M9/082 , G10K2210/108 , G10K2210/3018 , G10K2210/30232 , G10K2210/3049 , G10K2210/505 , G10K2210/512
摘要： A communication device, an apparatus, and a method for acoustic echo cancellation which makes use of a pseudonoise signal. An audio mixer adds the pseudonoise signal to an input signal received from another communication device to produce a first composite signal. An audio system converts the first composite signal to sound in an at least partially enclosed space. The at least partially enclosed space produces an acoustical echo in response. The audio system then converts the acoustical echo and other sounds in the at least partially enclosed space to a second composite signal. A signal processor cross-correlates the second composite signal with the pseudonoise signal to produce an estimate of the overall impulse response of the combined system formed by the at least partially enclosed space and the audio system. The processor then convolves the first composite signal with the impulse response estimate to produce an echo estimation signal. The echo estimation signal is an estimate of the component of the second composite signal which corresponds to the acoustical echo. The processor then subtracts the echo estimation signal from the second composite signal to produce an output signal.
摘要翻译：一种使用伪噪声信号的通信设备，装置和用于声学回声消除的方法。音频混合器将伪噪声信号添加到从另一通信设备接收的输入信号以产生第一复合信号。音频系统将第一复合信号转换成至少部分封闭的空间中的声音。至少部分封闭的空间产生响应的声学回波。然后，音频系统将至少部分封闭空间中的声学回声和其他声音转换为第二复合信号。信号处理器将第二复合信号与伪噪声信号相互相关，以产生由至少部分封闭的空间和音频系统形成的组合系统的总脉冲响应的估计。然后处理器将第一复合信号与脉冲响应估计进行卷积，以产生回波估计信号。回波估计信号是对应于声学回波的第二复合信号的分量的估计。然后，处理器从第二复合信号中减去回波估计信号以产生输出信号。

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