Matlab record with some baseband voice signal, the sampling frequency is set to 44.1kHz. Generating a Gaussian white noise Random process, and the noise superimposed on the speech signal (corresponding to the speech signal through a Gaussian channel). (1) set different noise SNR, draw time-domain waveform signal and compares the receiving end of a Gaussian channel, broadcast Put the received signal. (2) Because of the voice signal is usually less than 3kHz, is loaded at the receiving end of a low-pass filter, Cutoff frequency of 3kHz, draw time-domain waveform signal and compare before and after filtering, the filtered and play Signal.

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YUYIN

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