Well, I am new to DSP so I apologize for the basic question. I am trying to transform audio 16bit PCM (which I store in normalized 0.0-1.0 range) samples into frequency domain using fft.
I understand that FFT transforms N points of time domain into two N sized frequency domain array. My problem is determining the size of N. For example if I have a 5mins PCM signal sampled at 8000 Hz/sec I can't find a way to get the spectrum of the whole signal, and not several arrays of size (e.g. 1024, 2048 etc..).
So my question is:
- Can I transform the whole signal at once ?
- If I cannot, is there away to combine the spectrum of different N sized segments?
- Is it reasonable to study the spectrum of a whole large signal at once ?