I would like to resample an audio signal.
Sampling frequency of an original audio signal is 50k Hz.
What I want to down sampling frequency is 30k Hz.
In this case, I followed the procedures as below using LabVIEW.
'1. IIR low pass filter
Butterworth / 6th / Lowpass / up to 15k Hz
'2. Resample to 30kHz
Why I used LPF is to prohibit the anti-aliasing.
from now on, I have some questions.
1. Do we need to do LPF for prohibiting anti-aliasing? 2. If we have to do, how can we choose the lower cutoff frequency? In my case, I choose as 15k Hz because this is the new Nyquist frequency.
Thank you in advance.
OR is there the standard procedure for resampling?