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1. 发明申请

WO2005055204A1 AUDIO CODING 审中-公开
标题翻译：音频编码
公开(公告)号：WO2005055204A1
公开(公告)日：2005-06-16
申请号：PCT/IB2004/052539
申请日：2004-11-24
申请人： KONINKLIJKE PHILIPS ELECTRONICS N.V. , GERRITS, Andreas, J. , DEN BRINKER, Albertus, C. , RIERA PALOU, Felip
发明人： GERRITS, Andreas, J. , DEN BRINKER, Albertus, C. , RIERA PALOU, Felip
IPC分类号： G10L19/14
CPC分类号： G10L19/093 , G10L19/10 , G10L19/24
摘要： An audio coder is arranged to process a respective set of sampled signal values for each of a plurality of sequential segments of an audio signal (x). The coder comprises an analyser (TSA) arranged to analyse the sampled signal values to provide one or more sinusoidal codes (Cs) corresponding to respective sinusoidal components of the audio signal. A subtractor subtracts a signal corresponding to the sinusoidal components from the audio signal to provide a first residual signal (r 1 ). A modeller (SEG) models the frequency spectrum of the first residual signal (r 1 ) by determining first filter parameters (Ps) of a filter which has a frequency response approximating a frequency spectrum of the first residual signal. Another subtractor subtracts a signal corresponding to the first filter parameters from the first residual signal to provide a second residual signal (r 2 ). Another modeller (RPE) models a component (r 2 ,r 3 ) of the second residual signal with a pulse train coder (RPE) to provide respective pulse train parameters (L 0 ). A bit stream generator (15) generates an encoded audio stream (AS) including the sinusoidal codes (Cs), the first filter parameters (Ps) and the pulse train parameters (L 0 ).
摘要翻译：音频编码器被布置成处理音频信号（x）的多个连续片段中的每一个的相应组的采样信号值。编码器包括分析器（TSA），其被布置为分析采样的信号值以提供对应于音频信号的各个正弦分量的一个或多个正弦码（Cs）。减法器从音频信号中减去对应于正弦分量的信号，以提供第一残差信号（r1）。模拟器（SEG）通过确定具有接近于第一残差信号的频谱的频率响应的滤波器的第一滤波器参数（Ps）来对第一残差信号（r1）的频谱进行建模。另一个减法器从第一残差信号中减去对应于第一滤波器参数的信号，以提供第二残差信号（r2）。另一个建模器（RPE）用脉冲序列编码器（RPE）对第二残差信号的分量（r2，r3）建模，以提供相应的脉冲序列参数（L0）。比特流生成器（15）生成包括正弦码（Cs），第一滤波器参数（Ps）和脉冲串参数（L0）的编码音频流（AS）。

2. 发明申请

WO2007046070A1 ACOUSTIC ECHO CANCELLER 审中-公开
公开(公告)号：WO2007046070A1
公开(公告)日：2007-04-26
申请号：PCT/IB2006/053856
申请日：2006-10-19
申请人： KONINKLIJKE PHILIPS ELECTRONICS N.V. , RIERA-PALOU, Felip , ROOVERS, David Antoine Christian Marie , JANSE, Cornelis Pieter , MERKS, Ivo Leon Diane Marie
发明人： RIERA-PALOU, Felip , ROOVERS, David Antoine Christian Marie , JANSE, Cornelis Pieter , MERKS, Ivo Leon Diane Marie
IPC分类号： H04M9/08
CPC分类号： H04M9/082
摘要： An acoustic echo cancellation device (1) for canceling an echo in a microphone signal (z) in response to a far-end signal (x) comprises: an adaptive filter unit (10) arranged for filtering the far-end signal (x) so as to produce an echo cancellation signal (y), - a combination unit (12) arranged for combining the echo cancellation signal (y) with the microphone signal (z) so as to produce a residual signal (r), and a post-processor unit (13) arranged for substantially removing any remaining echoes from the residual signal. In accordance with the invention, the device further comprises: - a near-end pitch estimation unit (18) arranged for estimating the pitch of any near-end signal (s) contained in the microphone signal (z) and for controlling the post-processor unit (13) in dependence of the estimated pitch such that harmonics of the estimated pitch may be substantially preserved. The control unit may further be arranged for controlling the post-processor unit (13) in dependence of the estimated pitch of the residual signal in addition to the estimated pitch of the residual signal.
摘要翻译：用于响应于远端信号（x）消除麦克风信号（z）中的回波的声学回声消除装置（1）包括：自适应滤波器单元（10），被布置为滤波远端信号（x）以产生回波消除信号（y）， - 组合单元（12），被布置成将回波消除信号（y）与麦克风信号（z）组合以产生残余信号（r）处理器单元（13），被布置成基本上从剩余信号中去除任何剩余的回波。根据本发明，该装置还包括： - 近端音调估计单元（18），被布置用于估计麦克风信号（z）中包含的任何近端信号的音高，处理器单元（13），以使得可以基本上保持估计音调的谐波。控制单元还可以被布置成除了剩余信号的估计音调之外，还根据所估计的残余信号的音调来控制后处理器单元（13）。

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