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    • 8. 发明授权
    • Double-talk detector suitable for a telephone-enabled PC
    • 双通话检测器适用于支持电话的PC
    • US06792107B2
    • 2004-09-14
    • US09771260
    • 2001-01-26
    • Luke A. TuckerMark Greig Wildie
    • Luke A. TuckerMark Greig Wildie
    • H04M100
    • H04B3/234
    • A double-talk detector (109) for an acoustic echo canceler (104) of a VoIP terminal (101) converts (216,226) received far-end signals (212) and transmitted near-end signals (222) into the frequency domain and high-pass filters out (218,228) low-frequencies representing noise to obtain a complex reference signal and a complex error signal, respectively. It then correlates (230) the complex signals and computes (232) the instantaneous error energy (234) and smoothed (long-term average) error energy (235) of the complex error signal. If the convergence value is below 0.06 (300), the signals are converged and double-talk detection is enabled (306). If the convergence value is above 0.09 (312), the signals are diverged and double-talk detection is disabled (316). If double-talk detection is not enabled, an error threshold (236) is set (304,318) to the value of the smoothed error energy. If double-talk detection is enabled (320), presence of double-talk is indicated (328) if the instantaneous error energy value exceeds (324) the error threshold, and absence of double-talk is indicated (326) if the instantaneous error energy value does not exceed (324) the error threshold.
    • 用于VoIP终端(101)的声学回波消除器(104)的双方通话检测器(109)将接收的远端信号(212)和发送的近端信号(222)(216,226)转换成频域并且高 通过滤除(218,228)表示噪声的低频,以分别获得复参考信号和复信号。 然后,将复信号(230)相关(230)并计算复数误差信号的瞬时误差能量(234)和平滑(长期平均)误差能量(235)(232)。 如果收敛值低于0.06(300),则信号被收敛并且能够进行双方通话检测(306)。 如果收敛值高于0.09(312),则信号发散,双方通话检测被禁用(316)。 如果没有启用双方通话检测,则将误差阈值(236)设置为平滑误差能量的值(304,318)。 如果启用双方通话检测(320),如果瞬时误差能量值超过(324)误差阈值,则指示双方通话的存在(328),并且如果瞬时误差指示不存在双方通话(326) 能量值不超过(324)误差阈值。