公开(公告)号：KR1020130070903A

公开(公告)日：2013-06-28

申请号：KR1020110138155

申请日：2011-12-20

Applicant: 한국전자통신연구원

Inventor： 황인기 ,  추창연

IPC: G10K11/16 ,  G10L21/02

CPC classification number: H04B3/23 ,  H04M9/082

Abstract: PURPOSE: A device and a method for removing broadband acoustic echoes having adaptive tail length mounted in an embedded system are provided to possessively determine the tail length according to a result of a monitoring module estimating an environment capable of changing the toil length. CONSTITUTION: A device(100) for removing broadband acoustic echoes having adaptive tail length mounted in an embedded system comprises a delay length calculation unit(110), an adaptive filter implementation unit(120), an error calculation unit(130), a monitoring module(140), and an adaptive filter control unit(150). The delay length calculation unit calculates the delay length of an echo path by using close speaker signals and remote speaker signals. The adaptive filer implementation unit implements an adaptive filer by using a coefficient set based on the calculated delay length. The error calculation unit finds three sections which impulse responses with respect to the entire section of a tail of the adaptive filter are largest, thereby calculating the errors during the set coefficient. The monitoring module estimates a condition capable of changing the tail length. The adaptive filter control unit changes the tail length based on the estimated result. [Reference numerals] (100) Broadband acoustic echo removing device; (110) Delay length calculation unit; (120) Adaptive filter implementation unit; (130) Error calculation unit; (140) Monitoring module; (150) Adaptive filter control unit

Abstract translation: 目的：提供一种用于去除在嵌入式系统中安装有自适应尾长的宽带声回波的装置和方法，以根据监测模块估计能够改变长度的环境的结果来确定尾长。 一种用于去除具有安装在嵌入式系统中的自适应尾长的宽带声回波的装置（100），包括延迟长度计算单元（110），自适应滤波器实现单元（120），误差计算单元（130），监视 模块（140）和自适应滤波器控制单元（150）。 延迟长度计算单元通过使用紧密的扬声器信号和远程扬声器信号来计算回波路径的延迟长度。 自适应滤波器实现单元通过使用基于所计算的延迟长度的系数集来实现自适应滤波器。 误差计算单元找到三个部分，其中相对于自适应滤波器的尾部的整个部分的脉冲响应最大，从而计算设定系数期间的误差。 监视模块估计能够改变尾部长度的条件。 自适应滤波器控制单元根据估计结果改变尾部长度。 （附图标记）（100）宽带声回波去除装置; （110）延迟长度计算单位; （120）自适应滤波器实现单元; （130）误差计算单位; （140）监控模块; （150）自适应滤波器控制单元

公开(公告)号：KR1020120063421A

公开(公告)日：2012-06-15

申请号：KR1020110064854

申请日：2011-06-30

Applicant: 한국전자통신연구원

Inventor： 황인기 ,  추창연 ,  김도영 ,  이병선

IPC: G10K11/16 ,  G10L21/02

CPC classification number: G10K11/16 ,  G10K2210/108 ,  G10K2210/3028 ,  G10L21/0208

Abstract: PURPOSE: An acoustic echo removing device using an adaptive filter and method thereof are provided to improve an echo signal removing speed by omitting a process required for renewing a filter coefficient because values of the filter coefficients of predetermined numbers are maintained previous values when being decided the filter coefficients are collected in a process of removing acoustic echo using an adaptive filter algorithm. CONSTITUTION: A method for removing acoustic echo is same like next. Error signals are obtained by subtracting similar echo signals generated by long-distance signals from short distance signals. Whether a low power mode is set or not is decided based on the error signals(S130). If the low power mode is set, one or more filter coefficients used for an adaptive filter algorithm to remove acoustic echo is set as coefficient values previously used.

Abstract translation: 目的：提供一种使用自适应滤波器的声学回波消除装置及其方法，用于通过省略更新滤波器系数所需的处理来改善回波信号去除速度，因为当确定预定数量的滤波器系数的值被保持为先前值时 在使用自适应滤波器算法去除声学回波的过程中收集滤波器系数。 构成：去除声学回声的方法与下一样相同。 通过从短距离信号中减去长距离信号产生的相似回波信号来获得误差信号。 基于误差信号决定低功率模式是否被设定（S130）。 如果设置了低功率模式，则将用于去除声学回声的自适应滤波器算法所使用的一个或多个滤波器系数设置为先前使用的系数值。

公开(公告)号：KR1020130113779A

公开(公告)日：2013-10-16

申请号：KR1020120036254

申请日：2012-04-06

Applicant: 한국전자통신연구원

Inventor： 황인기 ,  추창연 ,  이병선

IPC: H04B3/20

CPC classification number: G10L21/0208 ,  G10L2021/02082

Abstract: PURPOSE: An apparatus for cancelling wideband acoustic echo and a method thereof are provided to minimize power consumption of a normalized least mean square (NLMS) device and to perform rapid recovery of a system. CONSTITUTION: An operation unit (130) calculates a threshold value and performance index of a filter coefficient. When the filter coefficient is smaller than the threshold value, a register (140) stores position information of data. When the performance index is lower than a predetermined convergence index after the performance index is compared with the convergence index by using a judgment unit, an index counter unit (150) increases a feedback counter value. When the feedback counter value corresponds to a predetermined recovery reference value, a recovery unit (160) recovers the feedback counter value to a filter coefficient value. [Reference numerals] (110) Determination unit; (120) Internal memory; (130) Operation unit; (140) Register; (150) Counter unit; (160) Recovery unit; (AA) Control unit

Abstract translation: 目的：提供一种用于消除宽带声回波的装置及其方法，以最小化归一化最小均方（NLMS）设备的功耗并执行系统的快速恢复。 构成：操作单元（130）计算滤波器系数的阈值和性能指标。 当滤波器系数小于阈值时，寄存器（140）存储数据的位置信息。 当通过使用判断单元将性能指标与收敛指数进行比较之后，性能指标低于预定收敛指数时，索引计数器单元（150）增加反馈计数器值。 当反馈计数器值对应于预定的恢复参考值时，恢复单元（160）将反馈计数器值恢复为滤波器系数值。 （附图标记）（110）确定单元; （120）内存; （130）操作单元; （140）注册; （150）计数器单元; （160）恢复单元; （AA）控制单元

公开(公告)号：KR1020130091910A

公开(公告)日：2013-08-20

申请号：KR1020120013247

申请日：2012-02-09

Applicant: 한국전자통신연구원

Inventor： 황인기 ,  추창연

IPC: H04B7/015 ,  H04B15/02

CPC classification number: H04M3/002 ,  H04B3/20

Abstract: PURPOSE: A broadband acoustic echo canceller and a method thereof are provided to improve the performance of a broadband acoustic echo device of a multichannel conference call equipment. CONSTITUTION: A central processing unit controls the transceived data flow. An operation processing unit (220) processes the data operation independently on the central processing unit. The central processing unit includes an operation decision unit (211). The operation decision unit decides a data processing operation mode. The operation processing unit performs the same process of multichannel data without interrupting the central processing unit through memory conversion. [Reference numerals] (210) Central processing unit; (211) Operation decision unit; (220) Operation processing unit; (221) Inverse correlation analysis unit; (222) Frame calculation unit; (223) Noise calculation unit; (224) First decision unit; (225) Second decision unit; (226) Control unit; (227) Filter unit; (228) Post-processing unit; (AA) Central processing unit; (BB) Interrupt processing unit; (CC) Memory control unit

Abstract translation: 目的：提供一种宽带声回波消除器及其方法，以改善多通道电话会议设备的宽带声回声设备的性能。 构成：中央处理单元控制收发的数据流。 操作处理单元（220）在中央处理单元上独立地处理数据操作。 中央处理单元包括操作决定单元（211）。 操作决定单元决定数据处理操作模式。 操作处理单元执行相同的多通道数据处理，而不会通过存储器转换中断中央处理单元。 （附图标记）（210）中央处理单元; （211）操作决策单元; （220）操作处理单元; （221）反相关分析单元; （222）帧计算单元; （223）噪声计算单元; （224）第一决策单位; （225）第二决策单位; （226）控制单元; （227）过滤单元; （228）后处理单元; （AA）中央处理单位; （BB）中断处理单元; （CC）存储器控制单元

公开(公告)号：KR1020120063422A

公开(公告)日：2012-06-15

申请号：KR1020110064864

申请日：2011-06-30

Applicant: 한국전자통신연구원

Inventor： 황인기 ,  추창연 ,  김도영 ,  이병선

IPC: G10L21/02 ,  G10K11/16

CPC classification number: G10L21/02 ,  G10L2021/02082 ,  H04B3/23

Abstract: PURPOSE: An acoustic echo removing apparatus and a method thereof are provided to control data width and to bypass operation of a logic in an adaptive filter algorithm. CONSTITUTION: An error signal generating unit(30) subtracts a similarity echo signal from the inputted radical speaker signal. The error signal generating unit generates an error signal. A filter control unit(40) determines a convergence state of the filter factor on an error signal. The filter control unit controls the data width if the filter factor is determined in a convergence state.

Abstract translation: 目的：提供一种声回波消除装置及其方法，以控制数据宽度并绕过自适应滤波算法中的逻辑运行。 构成：误差信号生成单元（30）从输入的激进扬声器信号中减去相似度回波信号。 误差信号生成部生成误差信号。 滤波器控制单元（40）确定滤波器因子对误差信号的收敛状态。 如果在收敛状态下确定了滤波因子，则滤波器控制单元控制数据宽度。