I'm trying to write a C program that can get the PSD of an recorded audio file, I'm using for the
fftw3 library. I wrote a program that calculate the PSD so far only for sinus function, but the result is correct, my problem is that I have some trouble to use the windowing method on my data.
Let's say that the audio file has following properties :
fs = 44100; length = 10sec;
So I got
441000samples, and I want to use windows, doesn't matter which one, with the size of 512, 25% overlapping, and shift my windows for the data. How could I know which value of the result is representing which frequency?
In Matlab it was easy here what I've done for example :
[x,fs] = audioread('fileName.wav'); [xPSD,f] = pwelch(x,hanning(8192),4096,8192*4 ,fs);
Thanks for any help or explanation!