Signal enhancement in the time domain

We first discuss signal enhancement in the time domain, which does not require a transform to the frequency domain. It is noted that all discrete signals should be sampled at uniform intervals. 

In many instances the quality of the signal has to be improved before the chemical information can be derived from it. One of the possible improvements is the reduction of the noise. In principle there are two options, the enhancement of the analog signal by electronic devices (hardware), e.g. an electronic filter, and the 

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