Under the MATLAB software platform, using the function wavread voice signal is sampled, the sampling frequency and sampling points to remember 2) Draw the speech signal in the time domain waveforms were sampled voice fft transform, to obtain the spectral characteristics of the signal voice signals were added to the sinusoidal noise and white noise, plus noise signal when drawn-domain waveform and frequency spectrum 3) According to the speech signal plus noise spectral analysis to determine the filter noise filter specifications, design an appropriate digital filter and draw the filter frequency response 4) Use a filter designed to increase the signal-to-noise filtering, draw before and after filtering the signal in the time domain with a window display and the spectrogram of the signal before and after filtering comparative analyzes signal change

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