How can I obtain a graphics of a sound input acquired through a microphone?

I need to obtain a graphic, .mat file for example, which should represent the audio trace acquired by a microphone connected to an FPGA.

I need the output to be in a form that should allow some processing on it, like for example a bandwith translation or an amplification.

Answer 1

[Walter Roberson]

You cannot do bandwidth translation (whatever that is) or amplification on a plot: you apply those to the audio data that you read in.

There are numerous different ways of representing audio data, including plain plot() in the time domain, right up to spectrogram()

[Giuliano Sisto]

Yes, of course Bandwidth translation makes no sense I'm sorry, I meant the application of filter in order to modify the band of the signal.

By the way, thank you for your answer, I'm gonna search something about these functions that you named, and eventually I'm gonna try to use them.