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    • 12. 发明申请
    • PROCESS FOR ADAPTIVE COMPENSATION OF ECHOES IN A COMMUNICATION SYSTEM
    • 通信系统中ECHOES自适应补偿的过程
    • WO1989005068A1
    • 1989-06-01
    • PCT/EP1988001061
    • 1988-11-23
    • SIEMENS AKTIENGESELLSCHAFT ÖSTERREICHSIEMENS AKTIENGESELLSCHAFTTSCHIRK, Wolfgang
    • SIEMENS AKTIENGESELLSCHAFT ÖSTERREICHSIEMENS AKTIENGESELLSCHAFT
    • H04B03/23
    • H04B3/231H04B3/237H04M9/082
    • An echo compensator (EK) for the autonomous speech system of a mobile telephone contains a digital signal processor (DSP) connected via analog/digital converters (A/D) to the emission and reception lines (SL, EL) in the low-frequency section of the mobile telephone. The acoustic and line-side electric echo is adaptively compensated. The relevant compensation value (c, c') is subtracted from the emission value (c) and the reception value (e). The acoustic and electric compensation value (c, c') is established in the corresponding adaptive filter (AF, AF'). The acoustic compensation value (c) is established by scalar multiplication of a summation vector obtained from previously scanned reception values (e) with a coefficient vector. The latter is determined from the previous coefficient vector by adding the product of the summation vector, divided by the energy of the reception signal, and the emission value(s) reduced by the acoustic compensation value (c). The compensation of the electric echo is carried out in a similar manner. Good echo compensation is thereby achieved with relatively few circuits and the emission signal is only delayed by approximately 128 mu s for the compensation of the electric echo and approximately 8 ms for the compensation of the acoustic echo.
    • 用于移动电话的自主语音系统的回波补偿器(EK)包含经由模拟/数字转换器(A / D)连接到低频发射和接收线路(SL,EL)的数字信号处理器(DSP) 部分移动电话。 声和线侧电回声被自适应地补偿。 从发光值(c)和接收值(e)中减去相关的补偿值(c,c')。 在相应的自适应滤波器(AF,AF')中建立声和电补偿值(c,c')。 声学补偿值(c)通过从先前扫描的接收值(e)获得的求和矢量与系数矢量的标量乘法来建立。 后者通过将求和矢量的积除以接收信号的能量与由声学补偿值(c)减小的发射值相加,从先前的系数向量确定。 电回声的补偿以类似的方式进行。 因此通过相对较少的电路实现良好的回波补偿,并且发射信号仅延迟约128μs用于补偿电回声,并且大约8ms用于声学回声的补偿。
    • 18. 发明申请
    • COUPLING FIELD FOR DIGITAL AUDIO SIGNALS
    • 数字音频信号耦合
    • WO1989011188A1
    • 1989-11-16
    • PCT/EP1989000515
    • 1989-05-11
    • SIEMENS AKTIENGESELLSCHAFT ÖSTERREICHSIEMENS AKTIENGESELLSCHAFTKRAKER, AlfredNEUHOLD, GünterKICKER, AugustMITTERBAUER, Raimund
    • SIEMENS AKTIENGESELLSCHAFT ÖSTERREICHSIEMENS AKTIENGESELLSCHAFT
    • H04J03/06
    • H04J3/0629H04H60/04
    • Coupling field for digital audio signals which are, in parallel representation, directed into the coupling field inputs over incoming data buses in individual scanning pulse sequences with differing scanning frequencies (fi) and transmitted to similar outgoing data buses in the same parallel representation over coupling field outputs which can be connected as desired. A specific coupling field scanning pulse with a scanning frequency (fK) is provided for circuit processes within the coupling field (KF); said scanning frequency (fK) is greater than all individual scanning frequencies (fi). An input intermediate storage chain (E1, E2...) with a corresponding comparative pulse circuit (V1, V2...) is provided for each coupling field input for obtaining a separate interference signal (I1, I2...) to measure the phase or frequency difference between the individual scanning frequency (fi1, f2) and the scanning frequency of the coupling field (fK). A pulse regenerating circuit (R1, R2...) controlled on the basis of the corresponding interference signal (I1, I2...) is provided with a corresponding output intermediate memory chain (A1, A2...) at each coupling field output. The interference signals (I1, I2...) from the comparative pulse circuits (V1, V2...) are coupled in coded form at the corresponding coupling field inputs into the data flows to the corresponding coupling field outputs and after they have been coupled out of the data flows at the coupling field outputs, they are directed towards the pulse regenerating circuits (R1, R2...).
    • 并行表示的数字音频信号的耦合场指向不同扫描频率(fi)的各个扫描脉冲序列中的输入数据总线上的耦合场输入,并以耦合场相同的并行表示方式发送到相似的输出数据总线 可根据需要连接的输出。 为耦合场(KF)内的电路工作提供具有扫描频率(fK)的特定耦合场扫描脉冲; 所述扫描频率(fK)大于所有单独的扫描频率(fi)。 为每个耦合场输入提供具有对应比较脉冲电路(V1,V2 ...)的输入中间存储链(E1,E2 ...),以获得单独的干扰信号(I1,I2 ...) 单个扫描频率(fi1,f2)和耦合场(fK)的扫描频率之间的相位或频率差。 基于对应的干扰信号(I1,I2 ...)控制的脉冲再生电路(R1,R2 ...)在每个耦合场提供相应的输出中间存储器链(A1,A2 ...) 输出。 来自比较脉冲电路(V1,V2 ...)的干扰信号(I1,I2 ...)以对应的耦合场输入的编码形式被耦合到数据流中,到相应的耦合场输出,并且在它们已经被 在耦合场输出处的数据流中耦合,它们被引导到脉冲再生电路(R1,R2 ...)。