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    • 9. 发明授权
    • Echo preventing circuit and digital signal processing circuit
    • 回波防止电路和数字信号处理电路
    • US07358875B2
    • 2008-04-15
    • US11627839
    • 2007-01-26
    • Takeo InoueHideki Ohashi
    • Takeo InoueHideki Ohashi
    • H03M1/00
    • H04M9/082H04B3/23
    • 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.
    • 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。
    • 10. 发明申请
    • Echo Preventing Circuit and Digital Signal Processing Circuit
    • 回波预防电路和数字信号处理电路
    • US20070176812A1
    • 2007-08-02
    • US11627839
    • 2007-01-26
    • Takeo InoueHideki Ohashi
    • Takeo InoueHideki Ohashi
    • H03M1/66
    • H04M9/082H04B3/23
    • 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.
    • 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。