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    • 95. 发明申请
    • ECHO SUPPRESSOR WITH ADAPTIVE DIGITAL FILTER FOR TRANSMISSION SYSTEM
    • 具有自适应数字滤波器的ECHO抑制器用于传输系统
    • WO1984004858A1
    • 1984-12-06
    • PCT/FR1984000140
    • 1984-05-25
    • CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUEBONNET, MadeleineMACCHI, Odile
    • CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE
    • H04B03/23
    • H04B3/232
    • The echo suppressor which may be used in a system for the simultaneous bidirectional transmission by MAQ modulation or phase modulation between two remote sources on a same transmission medium or circuit (10) comprises an adaptive digital filter (13) which provides the estimation sigma k of the effective echo. The adaptation algorithm of the vector C of the coefficients in: wherein mu is a predetermined incrementing pitch, ak is the conjugated value of the local data signals, ek is the signal deprived of the echo and f is a predetermined function. The output signal of the filter is subtracted from the signal arriving by the transmission medium. A corrector circuit is arranged between the transmission medium (10) and the subtractor (14) of the adapted filter to transform the complex remote data into a substantially real or imaginary data, the function f being able to use the sign only of ek.
    • 可用于通过同一传输介质或电路(10)上的两个远程源之间的MAQ调制或相位调制的同时双向传输的系统中的回波抑制器包括:自适应数字滤波器(13),其提供 有效回声。 系数的矢量C的适应算法:其中mu是预定的增加音调,ak是局部数据信号的共轭值,ek是被消除回波的信号,f是预定函数。 从传输介质到达的信号中减去滤波器的输出信号。 校正器电路布置在适配滤波器的传输介质(10)和减法器(14)之间,以将复杂的远程数据转换为基本上实际或虚数据,函数f仅能够使用ek的符号。