what is the C/D equation in dsp? I have one example test question by this kind:



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



and this c/d search results?



Thanks for your attention.
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.