[SciPy-User] Accurate Frequency Measurement

Charles R Harris charlesr.harris@gmail....
Mon Nov 29 22:10:22 CST 2010


On Mon, Nov 29, 2010 at 3:19 PM, Seth Nickell <snickell@gmail.com> wrote:

> I'm trying to measure the frequency of several sin 'tones' in a signal
> to within a hundredth of a Hz. I've made a 200s recording of the
> signal (44100 Hz wav file), but find that I cannot reasonably take an
> fft of the entire signal (takes 'forever'). The size of fft that seems
> to not take forever only gives me a resolution of a tenth of a Hz. The
> sin tones have the highest amplitudes by a long shot (i.e. the signal
> isn't very noisy). I've considered using a sin tone generator and
> using my ears+destructive interference to find the tones, but I'd like
> to be able to re-run this procedure on hundreds of signals, and I
> wouldn't be confident in the precision I could achieve.
>
>
Out of curiousity, did you use a power of two for the length of the
transform?

Chuck
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