I wish to do the FFT of streaming audio data coming into a computer. I am just interested in frequencies from 80 Hz up to 1000 Hz but with a frequency resolution of 3 to 4 Hz and no more.
Basically my question is , as my sampling frequency (Fs) is 44100, will my FFT window size have to be no less than 11025 (N) ? (because spacing of FFT bins = Fs/N). Does this mean that I am completely limited to taking windows of data any higher than 4 times a second with my desired resolution.
Unfortunately I need to be able to capture windows of data 8 times a second and also have a resolution of 3 to 4 Hz.
Is this actually possible? Many thanks in advance.