产生一正态分布序列 经过pcm编码、PCM解码、计算量化信噪比、设置信道误码率

-Generating a normal sequence after pcm encoding, PCM decoding, computing quantization noise ratio, set the channel error rate

x = randn (1,1000)　 generating a normal sequence

xf = fft (x, 256)　 1024 data points, that is a signal sampling data to process 1024 points

d = x

subplot (2,1,1)　 normal draw sequence time domain and frequency domain plots

plot (x)

title (　length of 1000 standard normally distributed random time-domain waveform signal )

subplot (2,1,2)

plot (abs (xf))

xlabel (　Frequency/Hz )

ylabel (　amplitude )

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