generating correct spectrogram using fftw and window function

Question

For a project I need to be able to generate a spectrogram from a .WAV file. I\'ve read the following should be done:

1. Get N (transform size) samples
2. Apply

Answer 1

Audacity typically doesn't map one frequency bin to one horizontal line, nor one sample period to one vertical line. The visual effect in Audacity may be due to resampling of the spectrogram picture in order to fit the drawing area.