about non-bandlimited signals

[mersault]

Hello,

I have a signal that is bandlimited in frequency. I have to work with a part of the signal, so that's equal to multiply the signal, in the time domain, with a rect function, then the signal is now, non-bandlimited. I need to take samples to rebuild the signal with a Digital-to-analog conversor. The nyquist frequency can't work here.

There's is a heuristic, algorithm, or method to sample this signal with finite samples, and trying to reduce the aliasing to the min value possible?

References to books and papers could help me too !

Thank you for all.

 

[FvM]

You didn't describe the nature of the original signal, if it's real sampled data or an assumed signal, that only exists on your paper.
In any case, it should be low pass filtered before sampling respectively re-sampling it, if aliasing is an issue in your application.