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a_d_1
(一)基本任务:单频正弦波模拟信号的简单数字化。即对一个单频正弦波模拟信号进行抽样、均匀量化、PCM二进制自然编码。
1、主要步骤和要求:
(1)单频正弦波模拟信号的抽样实现。要求输入信号的幅度A、频率F和相位P可变;要求仿真时间从0到2/F,抽样频率为Fs=20F;要求给出抽样信号samp的波形图。
(2)单频正弦波模拟信号均匀量化的实现。要求对抽样信号sampl归一化后再进行均匀量化;要求量化电平数D可变;要求输出信号为平顶正弦波;要求给出量化输出信号quant的波形图,并与抽样信号samp画在同一图形窗口中进行波形比较。
(3)单频正弦波模拟信号PCM二进制自然编码的实现。要求按量化序号给出PCM二进制自然编码;要求给出编码后的数字序列pcm。
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