脉冲编码调制(PCM)实现

编程实现PCM技术的三个过程：采样、量化与编码。

采样：低通连续信号采样，以 x=sin(200*t) m=x./(200*t) m=m.*m 为例说明低通采样定理，绘出信号时、频图形；带通连续信号采样，以x=sin(20*t) m=x./t 为例说明带通采样定理，绘出信号时、频图形。

量化：均匀量化，以幅度 的正弦信号为例实现为64级电平的均匀量化；非均匀量化，输入A律PCM编码器的正弦信号 ，采样序列为 ，将其进行PCM编码，给出编码器的输出码组序列

编码：以上述信号为例，实现A律的13折线近似法及国际标准PCM对数A律量化编码。-Pulse code modulation (PCM) to achieve

PCM technology programming three processes: sampling, quantization and coding.

Sample: low-pass continuous signal sampling to x = sin (200* t)　m = x./(200* t)　m = m.* m　an example low-pass sampling theorem, draw the signal, frequency graphics　bandpass sampling continuous signals to x = sin (20* t)　m = x./t　an example bandpass sampling theorem, draw the signal, frequency graph.

Quantization: uniform quantization, in order to realize the magnitude of sinusoidal signal as an example for the 64 level uniform quantization　non-uniform quantization, input A law PCM encoder sine signal, the sampling sequence, to be PCM encoded, the encoder is given The output code sequence

Code: A Case Study of the signal to achieve the 13 A line approximation law and international standards on the number of A law PCM coding quantization.