公开(公告)号：US20040252826A1

公开(公告)日：2004-12-16

申请号：US10477966

申请日：2004-08-09

发明人： Wen Shun Tian ,  Antonio Mario Alvarez-Tinoco

IPC分类号： H04M009/08 ,  H04M001/00

CPC分类号： H04M9/082 ,  H04B3/23

摘要： In a communications system having incoming communications signals and outgoing communications signals the outgoing communications signals may undesirably include an echo signal derived from the incoming communications signals. Accordingly, echo cancellation techniques may be applied in the communications system, including generating weighting filter coefficients based on linear prodictive coding coefficients calculated from a block comprising a plurality of sequential samples of the incoming communications signals. The incoming communications signals are filtered through a weighting filter utilising the weighting filter coefficients to produce a weighted incoming communications signals. Estimated echo signals are generated by filtering the incoming communications signals through an adaptive transversal filter, the adaptive transversal filter using adaptive filter coefficients. Then, the estimated echo signals can be subtracted from the outgoing communications signals to produce error signals. Advantageously, the adaptive filter coefficients are determined for each sample in said block on the basis of the weighted incoming communications signals and the error signals.

摘要翻译： 在具有输入通信信号和输出通信信号的通信系统中，输出通信信号可能不期望地包括从输入通信信号导出的回波信号。 因此，可以在通信系统中应用回声消除技术，包括基于由包括进入通信信号的多个连续样本的块计算的线性产生编码系数来生成加权滤波器系数。 输入的通信信号通过使用加权滤波器系数的加权滤波器进行滤波，以产生加权的进入通信信号。 通过自适应横向滤波器滤波输入的通信信号，使用自适应滤波器系数的自适应横向滤波器来产生估计回波信号。 然后，可以从输出通信信号中减去估计的回波信号以产生误差信号。 有利地，基于加权的进入通信信号和误差信号，为所述块中的每个采样确定自适应滤波器系数。

公开(公告)号：US20040234081A1

公开(公告)日：2004-11-25

申请号：US10385934

申请日：2003-02-06

发明人： Robert J. Brice ,  Steve K. Chin

IPC分类号： H04B001/00 ,  H04B001/034 ,  H04M009/08

CPC分类号： H04R5/04 ,  H04B1/205 ,  H04R1/1041 ,  H04R2420/07 ,  H04R2499/13

摘要： An automobile audio system, including a transmitter configured for installation within an automobile and further configured to wirelessly transmit modulated carrier data associated with at least two audio signals so that the modulated carrier data is receivable within the automobile. The automobile audio system may also include a receiver configured for use within the automobile, where the receiver is selectively tunable to obtain a recovered audio signal from the modulated carrier data and output the recovered audio signal, the recovered audio signal being an at least approximate reproduction of a user-desired one of the audio signals.

摘要翻译： 一种汽车音响系统，包括配置成安装在汽车内的发射器，并且进一步被配置为无线地传输与至少两个音频信号相关联的调制载波数据，使得调制载波数据可在汽车内接收。 汽车音响系统还可以包括被配置为在汽车内使用的接收器，其中接收机可选择性地可调谐以从调制的载波数据获得恢复的音频信号并输出​​恢复的音频信号，恢复的音频信号是至少近似的再现 的用户期望的一个音频信号。

公开(公告)号：US20040218755A1

公开(公告)日：2004-11-04

申请号：US10724043

申请日：2003-12-01

申请人： Tandberg Telecom AS

发明人： Trygve Frederik Marton ,  Ingvar Flaten Aarnes

IPC分类号： H04M009/08

CPC分类号： H04M9/082

摘要： An echo canceller processing echo, noise and near end talk in a narrower, but still intelligible, frequency band for reducing required processing power and complexity. In a preferred embodiment of the present invention, an input audio signal of captured sound in an audio communication system is decimated and then divided into a number of sub bands by an analyze filter. Each sub band is processed as in background audio echo cancelling by subtracting the signal with an echo estimate from a model of the acoustic signal in the respective sub band, except from that the signal is also bypassed, adjusted by a filter and subtracted from the processed signal. The resulting signals are then recombined by a synthesize filter and interpolated to the original sampling rate and bandwidth. Finally, the output from the synthesize filter is added to the input audio signal, which has been delayed and adjusted by a filter. The filters are controlled by a control algorithm detecting the presence of near end sound, far end sound and noise, so that the filters, and consequently the high pass filter of the echo canceller, only pass high frequency (above low pass frequencies) when only near end sound is detected.

摘要翻译： 回波消除器在较窄但仍然可理解的频带中处理回波，噪声和近端通话，以减少所需的处理能力和复杂性。 在本发明的优选实施例中，音频通信系统中的捕获声音的输入音频信号被抽取，然后由分析滤波器分成多个子频带。 通过从相应子带中的声学信号的模型中减去具有回波估计的信号来处理每个子带，除了信号被旁路之外，由滤波器调整并从处理的信号中减去 信号。 然后，所得到的信号由合成滤波器重新组合，并被内插到原始采样速率和带宽。 最后，将合成滤波器的输出添加到输入音频信号中，输入音频信号被滤波器延迟和调整。 滤波器由检测近端声音，远端声音和噪声的存在的控制算法控制，使得滤波器以及因此的回波消除器的高通滤波器仅在仅仅通过高频（高于低通频率）时才通过 检测到近端声音。

公开(公告)号：US20040208312A1

公开(公告)日：2004-10-21

申请号：US10834261

申请日：2004-04-29

发明人： Kozo Okuda

IPC分类号： H04M009/08 ,  H04M001/00 ,  H04M009/00

CPC分类号： H04B3/23

摘要： A digitized input signal is sampled, to obtain a reference input signal. The reference input signal is spuriously whitened, to obtain a pseudo whitened signal. An echo replica signal is generated on the basis of the pseudo whitened signal and an adaptive filter coefficient. A cancellation error signal is obtained on the basis of an echo signal and the echo replica signal. The adaptive filter coefficient is updated on the basis of the cancellation error signal, the adaptive filter coefficient, and the pseudo whitened signal.

摘要翻译： 对数字化输入信号进行采样，以获得参考输入信号。 参考输入信号被伪造白化，以获得伪白化信号。 基于伪白化信号和自适应滤波器系数生成回波复制信号。 基于回波信号和回波复制信号获得抵消误差信号。 基于消除误差信号，自适应滤波器系数和伪白化信号来更新自适应滤波器系数。

公开(公告)号：US20040208311A1

公开(公告)日：2004-10-21

申请号：US10457782

申请日：2003-06-10

申请人： Uniden Corporation

发明人： Kazunori Igarashi ,  Tetsuro Otake ,  Teruyasu Sugioka

IPC分类号： H04M009/08 ,  H04M001/76 ,  H04M007/00

CPC分类号： H04M9/082

摘要： An object of the present invention is to reduce unwanted voice echoed back to the transmitting party in an IP telephone. In order to achieve this object, in the curl cord of the present invention, two microphone lines connected to a differential input type microphone are respectively wired at approximately the same distance from a single speaker line connected to a single end output type speaker. Thereby, noise signals caused by cross-talk to the microphone lines from the speaker line transmitting the voice signal of the transmitting party will be of the same phase and same amplitude. By cancelling out these noise signals by means of common mode rejection in the differential amplifier provided in the base unit, it is possible to reduce the echoing back of unwanted voice to the transmitting party.

摘要翻译： 本发明的目的是减少在IP电话中回传给发送方的不需要的语音。 为了实现该目的，在本发明的卷曲中，连接到差分输入型麦克风的两个麦克风线分别以与连接到单端输出型扬声器的单个扬声器线大致相同的距离布线。 由此，由发送方发送语音信号的扬声器线路与麦克风线串扰引起的噪声信号将具有相同且相同的振幅。 通过在基本单元中提供的差分放大器中通过共模抑制来消除这些噪声信号，可以减少对发送方的不需要的语音的回送。

公开(公告)号：US20040170271A1

公开(公告)日：2004-09-02

申请号：US10483797

申请日：2004-01-13

发明人： Syuji Kubota

IPC分类号： H04M009/08

CPC分类号： H04M9/082 ,  H04B3/23

摘要： An echo canceller includes: an echo cancellation part canceling echo included in a near-end input signal; a noise suppression part employing a low-pass filter having a variable cut-off frequency adaptive to power of an input signal, the noise suppression part removing a residual echo component from an output of the echo canceller part; a threshold generation part generating a variable threshold varying in accordance with a power level of a far-end input signal; a determination part making a determination based on a comparison between a power level of the output of the echo cancellation part and the variable threshold; and a processing part performing noise suppression using the low-pass filter on the output of the echo cancellation part when the determination part determines that the power level of the output of the echo cancellation part is lower than or equal to the variable threshold.

摘要翻译： 回波消除器包括：回波消除部分消除包含在近端输入信号中的回波; 噪声抑制部分采用具有适应于输入信号功率的可变截止频率的低通滤波器，噪声抑制部分从回波消除器部分的输出中去除残余回波分量; 阈值生成部，生成根据远端输入信号的功率电平而变化的可变阈值; 确定部分，基于回波消除部分的输出的功率电平与可变阈值之间的比较来进行确定; 以及处理部，当所述判定部判定为所述回波消除部的输出的功率电平低于或等于所述可变阈值时，对所述回声消除部的输出，使用所述低通滤波器进行噪声抑制。

公开(公告)号：US20040161081A1

公开(公告)日：2004-08-19

申请号：US10770327

申请日：2004-02-02

申请人： Samsung Electronics Co., Ltd.

发明人： Jun-Young Jeong

IPC分类号： H04M011/00 ,  H04M009/08

CPC分类号： H04M11/062 ,  H04L5/0048 ,  H04L25/03159 ,  H04L27/2657 ,  H04L27/2662 ,  H04L2025/03414

摘要： An asymmetrical digital subscriber line (ADSL) communication system enhances the signal-to-noise ratio (SNR) of the received signals by conducting a PLL process with a tone conditioned on the most superior SNR, instead of a fixed tone. An improvement in data rate is thereby achieved.

摘要翻译： 不对称的数字用户线（ADSL）通信系统通过利用最优的SNR而不是固定的音调进行PLL调节，来增强接收信号的信噪比（SNR）。 从而实现数据速率的提高。

公开(公告)号：US20040151303A1

公开(公告)日：2004-08-05

申请号：US10716162

申请日：2003-11-19

发明人： Ho Chong Park ,  Seoung Jun Oh ,  Jong Beom Hwang

IPC分类号： H04M009/08

CPC分类号： H04M9/082

摘要： An apparatus and method for enhancing speech quality in digital communications. In the speech-quality enhancing apparatus, an input buffer stores a sum signal of a first input signal to be transmitted and an echo signal generated from a received second input signal at a predetermined time interval. An echo canceller receives the sum signal based on a unit of a buffer from the input buffer, cancels the echo signal from the sum signal, and outputs the first input signal. A noise canceller receives the first input signal based on the buffer unit from the echo canceller, and cancels a noise from the first input signal. A level controller receives the first input signal based on the buffer unit from the noise canceller, and adjusts a level of the first input signal. A speech compression module receives the first input signal based on the buffer unit from the level controller, converts the first input signal into a digital signal, and compresses the digital signal. Various information items produced as results of operations can be shared, and operation performances can be enhanced on the basis of the shared information items.

摘要翻译： 一种提高数字通信语音质量的装置和方法。 在语音质量提高装置中，输入缓冲器以预定的时间间隔存储要发送的第一输入信号和从所接收的第二输入信号产生的回波信号的和信号。 回波消除器基于来自输入缓冲器的缓冲器的单位接收和信号，从和信号中消除回波信号，并输出第一输入信号。 噪声消除器基于来自回波消除器的缓冲器单元接收第一输入信号，并且从第一输入信号中消除噪声。 电平控制器基于来自噪声消除器的缓冲器单元接收第一输入信号，并调整第一输入信号的电平。 语音压缩模块基于来自电平控制器的缓冲器单元接收第一输入信号，将第一输入信号转换为数字信号，并压缩数字信号。 可以共享作为操作结果生成的各种信息项，并且可以基于共享信息项来增强操作性能。

公开(公告)号：US20040136447A1

公开(公告)日：2004-07-15

申请号：US10736349

申请日：2003-12-15

发明人： Wilfrid LeBlanc

IPC分类号： H04B001/38 ,  H04L005/16 ,  H04M009/08

CPC分类号： H04M11/062 ,  G10L19/0208 ,  G10L19/24 ,  H04L5/06 ,  H04L47/32 ,  H04L49/90

摘要： An apparatus and methods supporting improved echo cancellation in a packet network is disclosed. An embodiment of the present invention may permit a split-band communication system operating in a narrowband mode to provide improved suppression of hybrid echo generated by the conversion of signals from a packet network to a two-wire analog circuit. By detecting the presence of signal characteristics outside of the relatively narrower bandwidth to be communicated, such an embodiment may more accurately detect the occurrence of speech received from a party on a relatively wider bandwidth communication circuit. The accurate detection of speech permits more effective suppression of any hybrid echo remaining after echo cancellation. An embodiment of the present invention may also have application in other systems that detect signals received via a path having a bandwidth greater than that to be transmitted.

摘要翻译： 公开了一种在分组网络中支持改进的回波消除的装置和方法。 本发明的实施例可以允许以窄带模式操作的分离带通信系统通过将信号从分组网络转换为双线模拟电路而产生的混合回声提供改进的抑制。 通过检测要传送的相对较窄带宽之外的信号特性的存在，这样的实施例可以更准确地检测在相对较宽带宽通信电路上从一方接收的语音的发生。 语音的准确检测允许更有效地抑制回声消除后剩余的任何混合回波。 本发明的实施例还可以应用于检测经由具有大于要发送的带宽的路径接收的信号的其他系统中。

公开(公告)号：US20040125943A1

公开(公告)日：2004-07-01

申请号：US10330430

申请日：2002-12-30

发明人： Charles R. Davis

IPC分类号： H04M009/08

CPC分类号： H04B3/23

摘要： Long distance telephone connections must commonly employ echo cancellers to eliminate irritating echo. The normal practice is to additionally employ non-linear processors (NLPs) as an integral component of an echo canceller in order to eliminate small residual echo which remains after initial echo cancellation. While such devices do indeed remove remaining residual echo, they also may introduce additional problems, such as suppression of the background signal. However, in some cases there is no need to deploy a potentially problematic non-linear processor. If the overall route delay of the telephone connection is not excessive, the participants do not notice the residual echo. Therefore, a determination is made of the end to end delay of the overall telephone connection. If the determined delay is not excessive, non-linear processing is not applied or is applied less aggressively. This results in a clearer telephone call, free from non-linear processor problems.

摘要翻译： 长距离电话连接必须通常使用回声消除器来消除刺激性回声。 通常的做法是额外地使用非线性处理器（NLP）作为回波消除器的组成部分，以便消除在初始回波消除之后保留的小残留回波。 虽然这样的装置确实去除剩余的残留回波，但是它们也可能引入诸如抑制背景信号的附加问题。 然而，在某些情况下，不需要部署潜在的有问题的非线性处理器。 如果电话连接的整体路由延迟不超过，参与者不会注意到剩余的回波。 因此，确定整个电话连接的端到端延迟。 如果确定的延迟不是过大的，则不应用非线性处理或较不积极地应用非线性处理。 这导致更清晰的电话呼叫，没有非线性处理器问题。