Leis J.W. - Digital Signal Processing Using MATLAB for Students and Researchers
This is an introduction book about dsp and I leant it by writing answers with necessary codes in Matlab.
As the author said that his book sets out to provide the necessarytheoretical and practical underpinnings of signal processing in a way that canbe readily understood by the newcomer to the field, I hope it will help you a bit.
These are several figures about this pdf.
and some figures of my answers
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