[LAD] Ladspa plugin invisible

Lars Luthman lars.luthman at gmail.com
Wed Nov 28 20:02:24 UTC 2007

On Wed, 2007-11-28 at 18:39 +0100, 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 ?
> For a 0.7 Hz precision with fft, I need 65536 samples, what will take a
> lot CPU load every 1.5 sec.
> It is obvious that so much CPU Load is no acceptable for a small plugin
> in a realtime application. 

There are a couple of algorithms that can get decent results with just a
couple of periods of data, but I think they all use some form of FFT or
convolution. A web search for autocorrelation and "fundamental
frequency" should find something.

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