1. The digital-to-analog converter is a system that converts digital signals into imitation signals, which can generally be completed by low-pass filtering. The digital signal is decoded in the first line, that is, the digital code is converted into the corresponding level to form a stepped signal, and then the low-pass filter is carried out.
According to the theory of signal and system, the digital stepped signal can be regarded as the convolution of the impulse sampling signal and the rectangular pulse signal, and the spectrum of the digital signal is the product of the spectrum of the impulse sampling signal and the rectangular pulse spectrum (i.e., the Sa function). In some cases, by using the reciprocal of the Sa function as a spectrum characteristic compensation, the digital signal can be restored to the sampled signal. From sampling, the spectrum of the sampled signal is obtained by low-pass filtering.
In general, the end is not based on these principles indirectly, because the sharp sampling signal is difficult to obtain, so the two filters (Sa function and aspiration low-pass) can be merged (cascaded), and because the filtering characteristics of these systems are physically incomplete, they can only be approximate in the real system.
2. The analog-to-digital converter is a system that converts imitation signals into digital signals, which is a process of filtering, sampling connection and coding.
The imitation signal is filtered by band limiting, sampled and connected to electricity, and then becomes a stepped shape signal, and then passes through the encoder to make each level in the stepped signal become binary code.
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