1) the use of tape recorders or other software under Windows, record your own voice signal period, the time control in about 1s, and the recorded signal is sampled 2) the spectrum of the speech signal analysis, time domain waveform and frequency spectrum of the speech signal sampled after drawing 3) the signal to the delay and reverb, and then analyze the spectrum, and compare with the original signal spectrum 4) designed several special types of filters: a single echo filter, multi-echo filters, all-pass structure of reverb and draw the filter frequency response 5) use their own design filter for filtering the speech signal acquisition 6) Analysis of the spectrum of the signal obtained after filtering the time-domain waveform and draw spectrum signals, and comparing the signal before and after filtering, analyzing changes in the signal 7) playback voice signal.

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