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    • 2. 发明授权
    • Method and apparatus for signal detection
    • 信号检测方法和装置
    • US07023981B2
    • 2006-04-04
    • US10041336
    • 2002-01-08
    • James Allen StephensLam Tak Wing
    • James Allen StephensLam Tak Wing
    • H04M1/82
    • H04M1/82
    • A signal detector for detecting a signal having a first nominal frequency, F1 and a second nominal frequency F2, the signal intermixed with an interfering signal to form a composite signal, the signal detector including a first and a second band pass filter centered at F1 and F2 for filtering the composite signal to provide an F1 and F2 signal; a parameter estimator for determining an F1 and F2 period for the F1 and F2 signal for a sequence of frames and an average period shift (APS) for a current frame and a plurality of earlier frames; a metric calculator for calculating a metric that corresponds to the F1 and F2 period and the APS; and a decision processor for deciding whether the signal has been detected based in part on a comparison of the metric and a threshold.
    • 一种用于检测具有第一标称频率F 1和第二标称频率F 2的信号的信号检测器,所述信号与干扰信号混合形成复合信号,该信号检测器包括以第一和第二频带滤波器为中心的第一和第二带通滤波器 F 1和F 2用于对复合信号进行滤波以提供F 1和F 2信号; 用于确定用于帧序列的F 1和F 2信号的F 1和F 2周期以及用于当前帧和多个较早帧的平均周期移位(APS)的参数估计器; 用于计算对应于F 1和F 2周期和APS的度量的度量计算器; 以及判定处理器,用于基于所述度量和阈值的比较来判定所述信号是否已经被检测到。
    • 3. 发明授权
    • Low-complexity comfort noise generator
    • 低复杂度舒适噪音发生器
    • US07243065B2
    • 2007-07-10
    • US10408996
    • 2003-04-08
    • James Allen StephensDavid L. BarronSean S. You
    • James Allen StephensDavid L. BarronSean S. You
    • G10L21/02
    • G10L19/012
    • A comfort noise generator (104) suitable for use in a communication system includes a finite impulse response (FIR) filter (136), a random number generator (140), and a coefficient updater (138). The coefficient updater (138) determines an updated set of filter coefficients (142) based on the signal frame of the input signal (102). The updated set of filter coefficients (142) is output to the FIR filter (136). The FIR filter (136) shapes a white noise signal (146) supplied by the random number generator (140) to provide a simulated background noise signal, or comfort noise signal (122). The comfort noise signal (122) is selectively output from an echo suppression system or corresponding method to overwrite or suppress reflected residual echoes.
    • 适用于通信系统的舒适噪声发生器(104)包括有限脉冲响应(FIR)滤波器(136),随机数发生器(140)和系数更新器(138)。 系数更新器(138)基于输入信号(102)的信号帧来确定更新的滤波器系数集合(142)。 更新的滤波器系数集合(142)被输出到FIR滤波器(136)。 FIR滤波器(136)形成由随机数发生器(140)提供的白噪声信号(146),以提供模拟背景噪声信号或舒适噪声信号(122)。 从回波抑制系统或相应的方法选择性地输出舒适噪声信号(122)以覆盖或抑制反射残余回波。