30 Nov
2007
30 Nov
'07
5:21 p.m.
Rémi Thébault wrote:
By the way, for the moment I use FFTW for the
frequency identification.
Is there a way to identify a frequency with quite high precision without
computing a big spectrum analysis ?
You might want to look at the Goertzel algorithm (see a DSP book or
http://en.wikipedia.org/wiki/Goertzel_algorithm).
Note, this doesn't effect how big of a window you need to resolve a
particular frequency. But, if you want to compute a big FFT, but will
only be looking at a relatively small subset of the freq bins it
outputs, then this can be more efficient.
Ken