公开(公告)号：US07358875B2

公开(公告)日：2008-04-15

申请号：US11627839

申请日：2007-01-26

申请人： Takeo Inoue ,  Hideki Ohashi

发明人： Takeo Inoue ,  Hideki Ohashi

IPC分类号： H03M1/00

CPC分类号： H04M9/082 ,  H04B3/23

摘要： An echo preventing circuit comprises a filter that is inputted with a first digital signal and outputs a second and a third digital signals; a first DA converter that converts the second digital signal into a first analog signal and outputs the first analog signal; a second DA converter that converts the third digital signal into a second analog signal and outputs the second analog signal; an input/output terminal that outputs the first analog signal or that is inputted with a third analog signal; a subtracting circuit that outputs a fourth analog signal obtained by subtracting the second analog signal from a signal formed by combining the first analog signal and the third analog signal; and an AD converter that converts the fourth analog signal into a fourth digital signal and outputs the fourth digital signal, wherein the filter sets filter coefficients for which the fourth analog signal is a signal formed by removing or attenuating the first analog signal from a signal formed by combining the first analog signal and the third analog signal, based on the fourth digital signal outputted from the AD converter when signals are inputted into the first and the second DA converters while the third analog signal is not present, and wherein the fourth analog signal outputted from the subtracting circuit is outputted as an output signal corresponding to the third analog signal.

摘要翻译： 回波防止电路包括输入第一数字信号并输出​​第二和第三数字信号的滤波器; 第一DA转换器，将第二数字信号转换为第一模拟信号并输出​​第一模拟信号; 第二DA转换器，其将第三数字信号转换为第二模拟信号并输出​​第二模拟信号; 输出/输出端子，其输出第一模拟信号或输入第三模拟信号; 减法电路，输出从通过组合所述第一模拟信号和所述第三模拟信号而形成的信号中减去所述第二模拟信号而获得的第四模拟信号; 以及AD转换器，其将第四模拟信号转换为第四数字信号并输出​​第四数字信号，其中滤波器设置通过从形成的信号中去除或衰减第一模拟信号而形成的第四模拟信号的滤波器系数 当第三模拟信号不存在时，通过将第一模拟信号和第三模拟信号组合在基于从AD转换器输出的第四数字信号输入到第一和第二DA转换器中，并且其中第四模拟信号 输出从减法电路输出的与第三模拟信号对应的输出信号。

公开(公告)号：US20070176812A1

公开(公告)日：2007-08-02

申请号：US11627839

申请日：2007-01-26

申请人： Takeo Inoue ,  Hideki Ohashi

发明人： Takeo Inoue ,  Hideki Ohashi

IPC分类号： H03M1/66

CPC分类号： H04M9/082 ,  H04B3/23

摘要： An echo preventing circuit comprises a filter that is inputted with a first digital signal and outputs a second and a third digital signals; a first DA converter that converts the second digital signal into a first analog signal and outputs the first analog signal; a second DA converter that converts the third digital signal into a second analog signal and outputs the second analog signal; an input/output terminal that outputs the first analog signal or that is inputted with a third analog signal; a subtracting circuit that outputs a fourth analog signal obtained by subtracting the second analog signal from a signal formed by combining the first analog signal and the third analog signal; and an AD converter that converts the fourth analog signal into a fourth digital signal and outputs the fourth digital signal, wherein the filter sets filter coefficients for which the fourth analog signal is a signal formed by removing or attenuating the first analog signal from a signal formed by combining the first analog signal and the third analog signal, based on the fourth digital signal outputted from the AD converter when signals are inputted into the first and the second DA converters while the third analog signal is not present, and wherein the fourth analog signal outputted from the subtracting circuit is outputted as an output signal corresponding to the third analog signal.

摘要翻译： 回波防止电路包括输入第一数字信号并输出​​第二和第三数字信号的滤波器; 第一DA转换器，将第二数字信号转换为第一模拟信号并输出​​第一模拟信号; 第二DA转换器，其将第三数字信号转换为第二模拟信号并输出​​第二模拟信号; 输出/输出端子，其输出第一模拟信号或输入第三模拟信号; 减法电路，输出从通过组合所述第一模拟信号和所述第三模拟信号而形成的信号中减去所述第二模拟信号而获得的第四模拟信号; 以及AD转换器，其将第四模拟信号转换为第四数字信号并输出​​第四数字信号，其中滤波器设置通过从形成的信号中去除或衰减第一模拟信号而形成的第四模拟信号的滤波器系数 当第三模拟信号不存在时，通过将第一模拟信号和第三模拟信号组合在基于从AD转换器输出的第四数字信号输入到第一和第二DA转换器中，并且其中第四模拟信号 输出从减法电路输出的与第三模拟信号对应的输出信号。

公开(公告)号：US20080181421A1

公开(公告)日：2008-07-31

申请号：US11968605

申请日：2008-01-02

申请人： Takeo Inoue ,  Hideki Ohashi

发明人： Takeo Inoue ,  Hideki Ohashi

IPC分类号： H04B3/20

CPC分类号： H04M9/082

摘要： A filter coefficient setting device for setting a filter coefficient of an echo prevention device including a first FIR filter, and a second FIR filter, comprises: a filter coefficient initial setting portion configured to set a predetermined filter coefficient for the first and second FIR filters when the echo prevention device is started.

摘要翻译： 一种用于设置包括第一FIR滤波器和第二FIR滤波器的回波防止装置的滤波器系数的滤波器系数设置装置，包括：滤波器系数初始设置部分，被配置为设置第一和第二FIR滤波器的预定滤波器系数， 回波防止装置启动。

公开(公告)号：US20070182614A1

公开(公告)日：2007-08-09

申请号：US11672648

申请日：2007-02-08

申请人： Takeo Inoue ,  Hideki Ohashi

发明人： Takeo Inoue ,  Hideki Ohashi

IPC分类号： H03M1/66

CPC分类号： H04M9/082

摘要： A filter coefficient setting apparatus that sets filter coefficients of an echo preventing circuit having a first FIR filter that is inputted with a first digital signal and that outputs a second digital signal, a second FIR filter that is inputted with the first digital signal at the same time that the first FIR filter is inputted with the first digital signal, and that outputs a third digital signal, a first DA converter that converts the second digital signal into a first analog signal and outputs the first analog signal, a second DA converter that converts the third digital signal into a second analog signal and outputs the second analog signal, an input/output terminal that outputs the first analog signal or that is inputted with a third analog signal, a subtracting circuit that outputs a fourth analog signal obtained by subtracting the second analog signal from a signal formed by combining the first analog signal and the third analog signal, and an AD converter that converts the analog signal outputted from the subtracting circuit into a digital signal and outputs the digital signal, the apparatus comprises a response signal acquiring unit that acquires a first response signal of a section from an output of the first FIR filter to an output of the AD converter by generating a first signal, adjusts the magnitude of the first signal in response to the magnitude of the first response signal, and acquires again the first response signal; a filter coefficient setting unit that sets the filter coefficients of the second FIR filter based on the first response signal acquired again and sets the filter coefficients of the first FIR filter based on a second response signal of a section from an output of the second FIR filter to an output of the AD converter; and a signal level adjusting unit that adjusts the signal levels of the first and the second analog signals based on the amount by which the level of the first signal is to be adjusted such that the fourth analog signal is a signal obtained by removing or attenuating the first analog signal from a signal formed by combining the first analog signal and the third analog signal.

公开(公告)号：US20060218214A1

公开(公告)日：2006-09-28

申请号：US11277200

申请日：2006-03-22

申请人： Hideki Ohashi ,  Kozo Okuda ,  Takeo Inoue

发明人： Hideki Ohashi ,  Kozo Okuda ,  Takeo Inoue

IPC分类号： G06F17/10

CPC分类号： H04B3/23

摘要： An echo prevention circuit comprises an input terminal to which a first input signal is input; a first FIR filter into which the first input signal is input through the input terminal; a second FIR filter into which the first input signal is input at the same time as into the first FIR filter; an input/output terminal to which an output signal of the first FIR filter is output or a second input signal is input; a subtracter that subtracts an output signal of the second FIR filter from a combined signal of the output signal of the first FIR filter and the second input signal; and an output terminal to which an output signal of the subtracter is output. The first and the second FIR filters have such filter coefficients that the output signal through the output terminal has only the output signal from the first FIR filter removed.

摘要翻译： 回波防止电路包括输入第一输入信号的输入端子; 第一FIR滤波器，通过输入端输入第一输入信号; 第一FIR滤波器，其中与第一FIR滤波器同时输入第一输入信号; 输入/输出第一FIR滤波器的输出信号或输入第二输入信号的输入/输出端子; 减法器，从第一FIR滤波器的输出信号和第二输入信号的组合信号中减去第二FIR滤波器的输出信号; 以及输出减法器的输出信号的输出端子。 第一和第二FIR滤波器具有通过输出端的输出信号仅具有去除第一FIR滤波器的输出信号的滤波器系数。

公开(公告)号：US20070205932A1

公开(公告)日：2007-09-06

申请号：US11681643

申请日：2007-03-02

申请人： Takeo Inoue ,  Hideki Ohashi ,  Yoshitaka Onaya

发明人： Takeo Inoue ,  Hideki Ohashi ,  Yoshitaka Onaya

IPC分类号： H03M1/66

CPC分类号： H04M9/082

摘要： An echo prevention circuit comprises a filter that is inputted with a first digital signal, the filter outputting second and third digital signals; a first DA converter that converts the second digital signal into a first analog signal and outputs the first analog signal; a second DA converter that converts the third digital signal into a second analog signal and outputs the second analog signal; an input/output terminal that outputs the first analog signal or that is inputted with a third analog signal; a subtracting circuit that outputs a fourth analog signal acquired by subtracting the second analog signal from a signal generated by combining the first analog signal and the third analog signal; an amplification circuit that amplifies the signal output from the subtracting circuit and outputs the amplified signal; an AD converter that converts the signal output from the amplification circuit into a digital signal and outputs the digital signal; a response signal acquiring unit that inputs a first signal to the first DA converter to acquire a first response signal from the input of the first DA converter to the output of the AD converter, the response signal acquiring unit inputting a second signal to the second DA converter to acquire a second response signal from the input of the second DA converter to the output of the AD converter; and a filter coefficient setting unit that sets filter coefficients to the filter based on the first and second response signals such that the fourth analog signal becomes a signal generated by removing or attenuating the first analog signal from the signal generated by combining the first analog signal and the third analog signal, the amplification circuit setting a gain to a first gain in response to a first control signal input before acquiring the first and second response signals, the amplification circuit setting the gain to a second gain larger than the first gain in response to a second control signal input after acquiring the first and second response signals.

公开(公告)号：US08934621B2

公开(公告)日：2015-01-13

申请号：US11277200

申请日：2006-03-22

申请人： Hideki Ohashi ,  Kozo Okuda ,  Takeo Inoue

发明人： Hideki Ohashi ,  Kozo Okuda ,  Takeo Inoue

IPC分类号： H04M9/08 ,  H04B3/23

CPC分类号： H04B3/23

摘要： An echo prevention circuit comprises an input terminal to which a first input signal is input; a first FIR filter into which the first input signal is input through the input terminal; a second FIR filter into which the first input signal is input at the same time as into the first FIR filter; an input/output terminal to which an output signal of the first FIR filter is output or a second input signal is input; a subtracter that subtracts an output signal of the second FIR filter from a combined signal of the output signal of the first FIR filter and the second input signal; and an output terminal to which an output signal of the subtracter is output. The first and the second FIR filters have such filter coefficients that the output signal through the output terminal has only the output signal from the first FIR filter removed.

摘要翻译： 回波防止电路包括输入第一输入信号的输入端子; 第一FIR滤波器，通过输入端输入第一输入信号; 第一FIR滤波器，其中与第一FIR滤波器同时输入第一输入信号; 输入/输出第一FIR滤波器的输出信号或输入第二输入信号的输入/输出端子; 减法器，从第一FIR滤波器的输出信号和第二输入信号的组合信号中减去第二FIR滤波器的输出信号; 以及输出减法器的输出信号的输出端子。 第一和第二FIR滤波器具有通过输出端的输出信号仅具有去除第一FIR滤波器的输出信号的滤波器系数。

公开(公告)号：US08467544B2

公开(公告)日：2013-06-18

申请号：US11968605

申请日：2008-01-02

申请人： Takeo Inoue ,  Hideki Ohashi

发明人： Takeo Inoue ,  Hideki Ohashi

IPC分类号： H04B15/00 ,  H04B3/20 ,  H04M9/08

CPC分类号： H04M9/082

摘要： A filter coefficient setting device for setting a filter coefficient of an echo prevention device including a first FIR filter, and a second FIR filter, comprises: a filter coefficient initial setting portion configured to set a predetermined filter coefficient for the first and second FIR filters when the echo prevention device is started.

摘要翻译： 一种用于设置包括第一FIR滤波器和第二FIR滤波器的回波防止装置的滤波器系数的滤波器系数设置装置，包括：滤波器系数初始设置部分，被配置为设置第一和第二FIR滤波器的预定滤波器系数， 回波防止装置启动。

公开(公告)号：US08036376B2

公开(公告)日：2011-10-11

申请号：US11277210

申请日：2006-03-22

申请人： Hideki Ohashi ,  Kozo Okuda ,  Takeo Inoue

发明人： Hideki Ohashi ,  Kozo Okuda ,  Takeo Inoue

IPC分类号： H04M9/08

CPC分类号： H04B3/23

摘要： An echo prevention circuit comprises a first and second FIR filters into which a first input signal is input through an input terminal; an input/output terminal to which an output signal of the first FIR filter is output and the output signal reflected is input or a second input signal is input; a first subtracter that subtracts an output signal of the second FIR filter from a combined signal of the output signal of the first FIR filter and the second input signal; an adaptive digital filter into which the output signal of the first FIR filter is input; a second subtracter that subtracts the output of the adaptive digital filter from the output of the first subtracter. The adaptive digital filter has such filter coefficients that based on the output of the second subtracter, the output signal from the output terminal is the output from the first subtracter that has had the other than the second input signal removed.

摘要翻译： 回波防止电路包括通过输入端输入第一输入信号的第一和第二FIR滤波器; 输出第一FIR滤波器的输出信号并输入反射的输出信号或输入第二输入信号的输入/输出端子; 第一减法器，从第一FIR滤波器的输出信号和第二输入信号的组合信号中减去第二FIR滤波器的输出信号; 自适应数字滤波器，其中输入第一FIR滤波器的输出信号; 第二减法器，其从第一减法器的输出中减去自适应数字滤波器的输出。 自适应数字滤波器具有基于第二减法器的输出的滤波器系数，来自输出端的输出信号是除去除了第二输入信号之外的第一减法器的输出。

公开(公告)号：US07420488B2

公开(公告)日：2008-09-02

申请号：US11672648

申请日：2007-02-08

申请人： Takeo Inoue ,  Hideki Ohashi

发明人： Takeo Inoue ,  Hideki Ohashi

IPC分类号： H03M1/00

CPC分类号： H04M9/082

摘要： Echo preventing circuit includes first and second FIR filters. The outputs of the first and second FIR filters are converted into first and second analog signals. An input/output terminal outputs the first analog signal or receives a third analog signal. An AD converter converts an analog signal obtained by subtracting the second analog signal from a signal formed by combining the first analog signal and the third analog signal. A response signal acquiring unit acquires a first response signal from an output of the first FIR filter to an output of the AD converter. A filter coefficient setting unit sets the filter coefficients of the second FIR filter based on the first response signal and sets the filter coefficients of the first FIR filter based on second response signal of a section from and output of the second FIR filter to an output of the AD converter.

摘要翻译： 回波防止电路包括第一和第二FIR滤波器。 第一和第二FIR滤波器的输出被转换成第一和第二模拟信号。 输入/输出端输出第一模拟信号或接收第三模拟信号。 AD转换器通过从通过组合第一模拟信号和第三模拟信号而形成的信号中减去第二模拟信号而获得的模拟信号。 响应信号获取单元从第一FIR滤波器的输出到AD转换器的输出获取第一响应信号。 滤波器系数设定单元基于第一响应信号设置第二FIR滤波器的滤波器系数，并且基于从第二FIR滤波器的一部分和从第二FIR滤波器的输出的第二响应信号将第一FIR滤波器的滤波器系数设置为 AD转换器。