Description: Record a voice signal their time was 10s or so, and the recorded signal is sampled draw sampled speech signal time-domain waveform and frequency spectrum using window functions or bilinear transformation design filters, and draw filter frequency response then use the filter of their own design collection of the voice signal filtering, to draw the filtered signal in time domain waveform and frequency spectrum, and comparing the signal before and after filtering, analysis of signal changes playback of audio signals .
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