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I have one example test question by this kind:

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So in this ebook (Digital Signal Processing Using MATLAB) as the DSP references and not found C/D block equations on it?

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and this c/d search results?

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Thanks for your attention.

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C/D is simply a "continuous-to-discrete" time conversion. In other words, sampling! :-) You can use $T$ to sample your continuous time signal $x(t)$ into a discrete time signal $x[n]$. Just replace $t=nT$ in your $x(t)$ equation, to turn it into a discrete time signal $x[n]$. D/C is the opposite operation. I think you can move on from here. Let us know if you can work it out now or if you need further help.

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  • $\begingroup$ Nice. For the record, the abbreviation is often found under "D/C Converter" or "C/D Converter", or "C-to-D"/"D-to-C" converters $\endgroup$
    – Laurent Duval
    Jan 5, 2020 at 16:51

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