How do i analyzing frequency using matlab

[nnm]

i want to analyze frequency which is recorded in matlab using wavrecord command ,

what is the highest frequency (for select best sampling rate next time recording)

Reduced noise
Understand behavior of frequency

plz anybody knows those thing post it for everybody's knowledge

 

[RDRyan]

use fft function you can get the spectrum of the signal.

Ryan

 

[brmadhukar]

If you need time domain -- use a BPF or you use the PSD function for FD interpretation.