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1. 发明授权

US5943645A Method and apparatus for computing measures of echo 失效
标题翻译：用于计算回波测量的方法和装置
公开(公告)号：US5943645A
公开(公告)日：1999-08-24
申请号：US847527
申请日：1997-04-24
申请人： Dominic Ho , Rafi Rabipour , Majid Foodeei
发明人： Dominic Ho , Rafi Rabipour , Majid Foodeei
IPC分类号： H04B3/20 , H04M9/08
CPC分类号： H04B3/20
摘要： In methods and apparatus for computing measures of echo of a far end signal in a near end signal, the evolution over time of frequency spectra of the near end and far end signals are compared to compute a measure of the echo. A far end spectrum of the far end signal and a near end spectrum of the near end signal are determined for each of a plurality of successive time intervals. A respective measure of correlation is determined for each of a plurality of spectrum pairs, each spectrum pair comprising a respective near end spectrum and a respective far end spectrum, the far end spectrum corresponding to a time interval which lags a time interval corresponding to the near end spectrum by a respective time lag. The measures of correlation are compared to determine a maximum measure of correlation which can be used as a measure of echo. The echo measure computation technique is particularly suitable for use in echo suppressors for digital cellular telephony systems, but has other applications.
摘要翻译：在近端信号中用于计算远端信号的回波测量的方法和装置中，比较近端和远端信号的频谱随着时间的演变，以计算回波的测量。为多个连续时间间隔中的每一个确定远端信号的远端频谱和近端信号的近端频谱。对于多个频谱对中的每一个确定相关的相关度量，每个频谱对包括相应的近端频谱和相应的远端频谱，远端频谱对应于滞后于与近距离对应的时间间隔的时间间隔结束频谱由相应的时间延迟。比较相关度的方法来确定可用作回波测量值的最大相关度量度。回波测量计算技术特别适用于数字蜂窝电话系统的回波抑制器，但具有其他应用。

2. 发明授权

US6011846A Methods and apparatus for echo suppression 失效
标题翻译：用于回波抑制的方法和装置
公开(公告)号：US6011846A
公开(公告)日：2000-01-04
申请号：US881062
申请日：1997-06-24
申请人： Rafi Rabipour , Dominic Ho , Majid Foodeei , Madeleine Saikaly
发明人： Rafi Rabipour , Dominic Ho , Majid Foodeei , Madeleine Saikaly
IPC分类号： G10L21/02 , H04B3/20 , H04B7/015 , G10L9/00
CPC分类号： H04B7/015 , H04B3/20 , G10L2021/02082
摘要： In methods and apparatus for suppressing echo of a far end signal encoded using LPC-based compression in a near end signal encoded using LPC-based compression, parameters of each frame of the near end encoded signal are processed without synthesizing a speech signal from the near end encoded signal to determine whether sufficient echo to merit echo suppression is present in the frame. Upon determining that insufficient echo to merit echo suppression is present in the frame, the parameters of the frame are passed unmodified. Upon determining that sufficient echo to merit echo suppression is present in said frame, the parameters of the frame are modified without synthesizing a speech signal to suppress echo in the frame. The methods and apparatus are particularly suitable in codec bypass applications.
摘要翻译：在使用基于LPC的压缩编码的近端信号中抑制使用基于LPC的压缩编码的远端信号的回波的方法和装置中，处理近端编码信号的每帧的参数，而不从近端结束编码信号以确定帧中是否存在足以有效回波抑制的回波。在确定帧中存在不足以获得回波抑制的回波的情况下，帧的参数未被修改。在确定在所述帧中存在足够的回波以获得回波抑制的情况下，修改帧的参数而不合成语音信号以抑制帧中的回波。该方法和装置特别适用于编解码器旁路应用。

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