Echo canceller with short processing delay and decreased multiplication
number
    1.
    发明授权
    Echo canceller with short processing delay and decreased multiplication number 失效
    回波消除器具有短处理延迟和减少的倍数

    公开(公告)号:US4951269A

    公开(公告)日:1990-08-21

    申请号:US216907

    申请日:1988-06-24

    IPC分类号: H03H21/00 H04B3/23

    摘要: An echo canceller in a system, having a long impulse response such as in an acoustic system, which employs a fast Fourier transform to transform input data represented in the time domain into signals represented in the frequency domain to reduce calculations. To solve the problem of a long delay, the impulse response length is divided into a plurality of blocks. Each block then has a decreased number of samples within each block. Thus, a fast Fourier transform and finite impulse response type digital filtering are effected, so that the processing delay is decreased while the amount of calculations is kept small.

    摘要翻译: PCT No.PCT / JP87 / 00833 Sec。 371日期1988年6月24日第 102(e)日期1988年6月24日PCT提交1987年10月29日PCT公布。 第WO88 / 03341号公报 日期:1988年5月5日。在具有诸如在声学系统中的长脉冲响应的系统中的回波消除器,其采用快速傅里叶变换来将在时域中表示的输入数据变换成在频域中表示的信号以减少计算 。 为了解决长延迟的问题,脉冲响应长度被分成多个块。 每个块在每个块内具有减少的采样数。 因此,实现快速傅里叶变换和有限脉冲响应型数字滤波,使得处理延迟减小,同时计算量保持较小。