公开(公告)号：US5737410A

公开(公告)日：1998-04-07

申请号：US666412

申请日：1996-09-13

申请人： Antti Vahatalo ,  Jorma Makinen

发明人： Antti Vahatalo ,  Jorma Makinen

IPC分类号： H03H21/00 ,  H03H17/02 ,  H04B3/23 ,  H04B3/20

CPC分类号： H04B3/23

摘要： A method for adaptation to an echo location in an echo canceller comprising an output port, an input port, an adjustable delay unit (43) compensating for the pure delay component in the echo path between the echo location and the output port of the echo canceller, a digital filter (40) calculating, from a signal outgoing to the echo path, an echo location estimate which is shorter than the maximum allowed duration of the echo path. The echo location is determined by calculating the echo path location at which there is a high correlation between the signal outgoing to the echo path and the returned echo. The correlation is calculated in a sliding window having the length of the digital filter.

摘要翻译： PCT No.PCT / FI94 / 00577 Sec。 371日期1996年9月13日 102（e）1996年9月13日PCT 1994年12月21日PCT PCT。 公开号WO95 / 17784 日期1995年6月29日一种用于适应回波消除器中的回波位置的方法，包括输出端口，输入端口，可调节延迟单元（43），其补偿回波位置和输出端之间的回波路径中的纯延迟分量 回波消除器的端口，从输出到回波路径的信号中计算比回波路径的最大允许持续时间短的回波位置估计的数字滤波器（40）。 回波位置是通过计算回波路径位置来确定的，在回波路径位置处，出现回波路径的信号与返回的回波之间存在高相关性。 在具有数字滤波器的长度的滑动窗口中计算相关性。

公开(公告)号：US6163609A

公开(公告)日：2000-12-19

申请号：US61623

申请日：1998-04-16

申请人： Jorma Makinen ,  Antti Vahatalo

发明人： Jorma Makinen ,  Antti Vahatalo

IPC分类号： H04M1/60 ,  H04B3/23 ,  H04B7/26 ,  H04M9/00

CPC分类号： H04B3/23

摘要： The invention relates to echo cancelling methods used in telephone systems, more specifically to echo cancelling methods based on two filters. The echo cancelling method according to the invention employs two adaptive filters, namely, a main filter (10) and a background filter (50). The purpose of the background filter (50) is to make sure that the main filter (10) model stays correct. The main and background filter coefficients are updated on different conditions, and the residual signals (L.sub.-- RES1, L.sub.-- RES2) produced by the filters are compared to each other. The set of filter coefficients used for generating the echo canceller's output signal (S.sub.-- OUT) is selected on the basis of said comparison of the residual signals. The selection of the set of filter coefficients is carried out either by copying the background filter coefficients to the main filter or by interchanging the background and main filter functions. Operation of the echo canceller in a double talk situation is enhanced by comparing the residual signals produced by the two filters frequency band by frequency band, thus avoiding errors caused by echo-resembling correlations caused by random loud sounds in double talk situations.

摘要翻译： 本发明涉及电话系统中使用的回波消除方法，更具体地涉及基于两个滤波器的回波消除方法。 根据本发明的回波消除方法采用两个自适应滤波器，即主滤波器（10）和背景滤波器（50）。 背景过滤器（50）的目的是确保主过滤器（10）型号保持正确。 在不同条件下更新主要和背景滤波器系数，并将由滤波器产生的残留信号（L-RES1，L-RES2）彼此进行比较。 基于残差信号的比较来选择用于产生回声抵消器输出信号（S-OUT）的滤波器系数集合。 通过将背景滤波器系数复制到主滤波器或通过交换背景和主滤波器功能来执行滤波器系数集合的选择。 通过比较两个滤波器频带由频带产生的残留信号，从而避免双重通话情况下由随机响亮的声音引起的回声类似相关性引起的错误，从而增强双重通话情况下的回波消除器的操作。

公开(公告)号：US20090253418A1

公开(公告)日：2009-10-08

申请号：US11921207

申请日：2005-06-30

申请人： Jorma Makinen

发明人： Jorma Makinen

IPC分类号： H04M3/42 ,  H04M1/00

CPC分类号： H04R27/00

摘要： The present invention concerns a system for a conference call, which includes: at least one portable audio device (MEM2-MEMn) arranged in an common acoustic space (AS) which device (MEM2-MEMn) is equipped with audio components (LS2-LSn, MIC2-MICn) for inputting and outputting an audible sound and at least one communication module (22); at least one base station device (MA) to which at least the said one portable audio device is interconnected and which base station device is connected to the communication network (CN) in order to perform the conference call from the said common acoustic space. At least part of the portable audio devices are personal mobile devices which audio components (MIC2-MICn) are arranged to pick the audible sound from the said common acoustic space.

摘要翻译： 本发明涉及一种用于电话会议的系统，其包括：至少一个便携式音频设备（MEM2-MEMn），其布置在公共声学空间（AS）中，该设备（MEM2-MEMn）配备有音频分量（LS2-LSn ，MIC2-MICn），用于输入和输出可听见的声音和至少一个通信模块（22）; 至少一个基站装置（MA），至少所述一个便携式音频装置互连到，以及哪个基站装置连接到通信网络（CN），以便从所述公共声学空间执行会议呼叫。 便携式音频设备的至少一部分是个人移动设备，音频组件（MIC2-MICn）被布置成从所述公共声学空间拾取可听见的声音。