-
公开(公告)号：US4479036A
公开(公告)日：1984-10-23
申请号：US434271
申请日：1982-10-14
申请人： Seiichi Yamamoto , Seishi Kitayama
发明人： Seiichi Yamamoto , Seishi Kitayama
CPC分类号： H04B3/23
摘要： An echo control system for an adaptive echo canceller which forms a pseudo-echo or its residual signal by combining respective outputs from a tapped delay line holding an estimated characteristic of an echo path as a tap weight and receiving a received signal or its residual signal as an input signal, subtracts the pseudo-echo or its residual signal from an echo signal or its residual signal, and corrects the tap weight using an amount of correction obtained by the resulting residual echo signal or its residual signal and the received signal or its residual signal. In accordance with the invention, there are provided a circuit noise estimation circuit for estimating a circuit noise of the echo path, a parameter error estimation circuit for estimating a parameter error between the characteristic of the echo path and its estimated characteristic, and a coefficient calculator for determining a correction coefficient obtained with the circuit noise, the parameter error and the received signal, wherein the said tap weight is corrected in accordance with the result of multiplication of the amount of correction and the correction coefficient. The system may be further provided with a device for transferring, as the said tap weight, the tap weight of the tapped delay line in the circuit noise estimation circuit when the circuit noise formed in the circuit noise estimation circuit is smaller than the residual echo signal.
摘要翻译： 一种用于自适应回波消除器的回波控制系统，其通过组合来自保持回波路径的估计特性的抽头延迟线的相应输出作为抽头加权并接收接收信号或其残留信号来形成伪回波或其残留信号， 输入信号，从回波信号或其残差信号中减去伪回波或其残差信号，并使用得到的残差回波信号或其残差信号及其接收信号或其残差获得的校正量校正抽头权重 信号。 根据本发明，提供了一种用于估计回波路径的电路噪声的电路噪声估计电路，用于估计回波路径的特性与其估计特性之间的参数误差的参数误差估计电路，以及系数计算器 用于确定用电路噪声，参数误差和接收信号获得的校正系数，其中所述抽头权重根据校正量和校正系数的相乘结果被校正。 当电路噪声估计电路中形成的电路噪声小于残留回波信号时，该系统可以进一步设置有作为所述抽头重量的电路噪声估计电路中的抽头延迟线的抽头重量的装置 。
-
公开(公告)号：US4232400A
公开(公告)日：1980-11-04
申请号：US37176
申请日：1979-05-08
申请人： Seiichi Yamamoto , Seishi Kitayama
发明人： Seiichi Yamamoto , Seishi Kitayama
CPC分类号： H04B3/23
摘要： An echo control system for an adaptive echo canceller which cancels an echo signal while successively estimating the transmission characteristic of an echo path by the use of a received signal and the echo signal, comprising means using the received signal of a predetermined duration for obtaining an autoregression coefficient in a case of using the received signal as the output of an autoregressive model, means for obtaining a difference signal between a predicted value of the received signal produced by using the autoregression coefficient and the received signal, means for obtaining a difference signal between a predicted value of the echo signal produced by using the autoregression coefficient and the echo signal, a memory for storing the estimated transmission characteristic of the echo path, and a corrector for correcting the content of the memory following an identification method by learning. The content of the memory is successively corrected by the corrector on the basis of the difference signal of the received signal and the difference signal of the echo signal. An echo replica is produced using the successively corrected estimated transmission characteristic and is used to subtract it from the true echo signal, thereby cancelling the echo signal.
摘要翻译： 一种用于自适应回声消除器的回波控制系统，其通过使用接收信号和回波信号连续估计回波路径的传输特性来消除回波信号，包括使用预定持续时间的接收信号获得自回归的装置 在使用接收信号作为自回归模型的输出的情况下的系数的装置，用于获得通过使用自回归系数产生的接收信号的预测值与接收信号之间的差分信号的装置，用于获得在 通过使用自回归系数和回波信号产生的回波信号的预测值，用于存储回波路径的估计传输特性的存储器，以及用于通过学习进行识别方法校正存储器的内容的校正器。 基于接收信号的差分信号和回波信号的差分信号，校正器依次校正存储器的内容。 使用连续校正的估计传输特性产生回波复制品，并用于从真实回波信号中减去回波复制品，从而消除回波信号。
-
公开(公告)号：US4064378A
公开(公告)日：1977-12-20
申请号：US691030
申请日：1976-05-28
申请人： Seishi Kitayama , Akira Sato , Junzo Tamura
发明人： Seishi Kitayama , Akira Sato , Junzo Tamura
摘要： An echo cancelling system for multiplex circuits, in which an impulse response of an echo-path is obtained from signals at respective ends of the transmission path and the receiving path connected to the echo-path to produce an echo-path model, and in which a pseudo echo signal is then provided to subtract it from an echo signal of the echo-path thereby to cancel the echo signal. In accordance with this invention, adaptive echo-path models each for corresponding channel of the multiplex circuits are provided for storing impulse response signals within a holding time of an impulse response in the long distance multiplex telephone circuits, and an adaptive echo-path model for the common use of multiplex circuits is provided for storing, in a time-divisional manner according to the known queue control, (a) information within a flat delay time of the impulse response, (b) impulse response signals within the holding time of the impulse response and (c) information within a certain constant time after the impulse response. The adaptive echo-path model for the common use is activated if the level of a residual echo signal is higher than a predetermined value, and the adaptive echo-path model for each channel is activated if the level of a residual echo signal is smaller than the predetermined value.
摘要翻译： 一种用于多路复用电路的回波消除系统，其中从传输路径和连接到回波路径的接收路径的各端的信号获得回波路径的脉冲响应，以产生回波路径模型，其中 然后提供伪回波信号以从回波路径的回波信号中减去它，从而消除回波信号。 根据本发明，为多路复用电路的相应通道提供各自的自适应回波路径模型，用于在长距离多路复用电话电路中的脉冲响应的保持时间内存储脉冲响应信号，以及用于 提供了多路复用电路的常见用途，用于按照已知的队列控制以时分方式存储（a）脉冲响应的平坦延迟时间内的信息，（b）脉冲响应的保持时间内的脉冲响应信号 脉冲响应和（c）在脉冲响应之后的一定恒定时间内的信息。 如果残余回波信号的电平高于预定值，则激活用于常用的自适应回波路径模型，并且如果残余回波信号的电平小于每个信道的自适应回波路径模型，则激活每个信道的自适应回波路径模型 预定值。
-
公开(公告)号：US4610022A
公开(公告)日：1986-09-02
申请号：US449760
申请日：1982-12-14
申请人： Seishi Kitayama , Fumihiro Yato , Akira Kurematsu
发明人： Seishi Kitayama , Fumihiro Yato , Akira Kurematsu
CPC分类号： G10L19/06
摘要： In a speech transmission or storage system using LPC parameters and a Baseband Signal derived from the prediction error signal, the synthesis excitation signal is formed from the baseband plus high-frequency regeneration, which is then spectrum-flattened for proper synthesis.
摘要翻译： 在使用LPC参数和从预测误差信号导出的基带信号的语音传输或存储系统中，合成激励信号由基带加上高频再生形成，然后被频谱平坦化以进行合理的合成。
-
公开(公告)号：US4126770A
公开(公告)日：1978-11-21
申请号：US880478
申请日：1978-02-23
申请人： Akira Sato , Junzo Tamura , Seishi Kitayama
发明人： Akira Sato , Junzo Tamura , Seishi Kitayama
摘要： An echo canceller in a telephone circuit for minimizing a residual echo obtained by subtracting a pseudo-echo reproduced from an impulse response of an echo path from a true echo, in which the inpulse response is corrected by the use of the product of the residual echo and received input. A variable coefficient circuit is provided between a multiplier for obtaining the product and a circuit for correcting the impulse response. A control circuit is provided for reducing the coefficient of the variable coefficient circuit in accordance with the lapse of time of the duration of the received input exceeding a predetermined threshold level after receiving a circuit connection completion signal of the telephone circuit.
摘要翻译： 电话电路中的回波消除器，用于最小化通过从真实回波减去从回波路径的脉冲响应再现的伪回波而获得的残余回声，其中通过使用残差回波的乘积来校正脉冲响应 并收到输入。 在用于获得产品的乘法器和用于校正脉冲响应的电路之间提供可变系数电路。 提供一种控制电路，用于在接收到电话电路的电路连接完成信号之后，根据所接收的输入的持续时间经过预定的阈值电平来减小可变系数电路的系数。
-
公开(公告)号：US4516259A
公开(公告)日：1985-05-07
申请号：US375356
申请日：1982-05-06
申请人： Fumihiro Yato , Seishi Kitayama , Akira Kurematsu
发明人： Fumihiro Yato , Seishi Kitayama , Akira Kurematsu
CPC分类号： G10L19/06
摘要： In a speech analysis-synthesis system for the narrow band transmission of a speech signal, speech is separated into a plurality of spectrum information (K.sub.i), average (V.sub.0) of linear prediction error signal, pitch period (L), voiced/unvoiced decision signal (V/UV), a pseudo exciting signal (I) which is a part of a linear prediction error signal or an impulse response of the same, and a frame information which determines the interval and the duration of the spectrum analyzation, then, in a receive side, the product of said pseudo excitation signal (I) and said pitch period (L), a white noise is switched according to said voiced/unvoiced decision signal (V/UV), and the output of the switch is applied to a synthesis filter which attaches correlation components to an input signal according to spectrum information (K.sub.i) to provide synthesized speech.
摘要翻译： 在用于语音信号的窄带传输的语音分析合成系统中，将语音分为多个频谱信息（Ki），线性预测误差信号的平均值（V0），音调周期（L），有声/无声决定 信号（V / UV），作为线性预测误差信号或其脉冲响应的一部分的伪激励信号（I）和确定频谱分析的间隔和持续时间的帧信息， 在接收侧，所述伪激励信号（I）和所述音调周期（L）的乘积根据所述有声/无声判定信号（V / UV）切换白噪声，并且应用开关的输出 涉及根据频谱信息（Ki）将相关分量附加到输入信号以提供合成语音的合成滤波器。
-
公开(公告)号：US4633046A
公开(公告)日：1986-12-30
申请号：US580922
申请日：1984-02-16
申请人： Seishi Kitayama , Tsutomu Washida , Yuzo Fukushi , Yoshinori Ito
发明人： Seishi Kitayama , Tsutomu Washida , Yuzo Fukushi , Yoshinori Ito
摘要： In order to prevent tap coefficient values from drifting toward excessively large values or divergence, an adaptive echo canceller is provided with a correction signal controller which (a) reduces the tap coefficient values upon the polarities of the tap coefficient signal and the tap coefficient correction signal coinciding and (b) increases the tap coefficient values upon the polarities differing.
摘要翻译： 为了防止抽头系数值偏离过大的值或发散，自适应回波消除器设置有校正信号控制器，该校正信号控制器（a）根据抽头系数信号和抽头系数校正信号的极性减小抽头系数值 （b）在极性不同的情况下增加抽头系数值。
-
公开(公告)号：US4282406A
公开(公告)日：1981-08-04
申请号：US122256
申请日：1980-02-19
CPC分类号： G10L25/90
摘要： A system for detecting the pitch of a voice signal, in which a plurality of pitch searching periods are determined so that pitch components of multiple relationship are not included in each of the pitch searching periods, and in which after detecting a pitch searching period including the pitch from the pitch searching periods, the pitch searching periods are adaptively shifted in a mannger to follow the change direction of the pitch predicted from the result of detection of the detected pitch.
摘要翻译： 一种用于检测语音信号的音调的系统，其中确定多个音调搜索周期，使得每个音调搜索周期中不包括多个关系的音调分量，并且其中在检测包括音调搜索周期的音调搜索周期之后 从音调搜索周期的音调，音调搜索周期在甘度器中自适应地移位，以跟随从检测到的音调的检测结果预测的音调的改变方向。
-
-
-
-
-
-
-
搜索结果
8 条记录 (耗时 0.016 秒)
