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模拟信号数字化的第一步是在时间上对原信号进行离散化处理。即将时间上连续的信号处理成时间上离散的信号，这一过程称为抽样。要把原来是连续的模拟信号的传输转化为传输时间上离散的信号，从信息传输的角度考虑，这必然要求抽样后的信号载有原信号的全部信息，从而保证在接
The first step in digitizing an analog signal is to discretize the original signal in time. That is, time-continuous signal processing into discrete signals over time, a process known as sampling. It is necessary to convert the original continuous analog signal transmission to the transmission time discrete signals, from the perspective of information transmission, which inevitably requires sampling the signal contains all the information of the original signal, thus ensuring the connection