Hi,I actually implemented this a few years back using an FFT algorithm, I can
dig out the code if you need it (it was a VST written using Juce and fftw, but
there was no threading on the FFT if I remember correctly, so it is flawed as
it is and it requires running with large blocksizes.I doubt simple time-domain
algorithm would work without obvious artefacts, as the periodicity is not
guaranteed and the combined period could be very long anyhow.
The FFT implementation I made was the text-book phase vocoder but I was doing
the forward FFT only once at the beginning of a freeze, to "sample" the signal,
then I would keep the vector of amplitudes constant while updating the phase.
Best,Giulio
From: Spencer Jackson <ssjackso...@gmail.com>
To: music-dsp@music.columbia.edu
Sent: Friday, 16 September 2016, 18:30
Subject: Re: [music-dsp] Help with "Sound Retainer"/Sostenuto Effect
On Fri, Sep 16, 2016 at 11:24 AM, gm <g...@voxangelica.net> wrote:
> Did you consider a reverb or an FFT time stretch algorithm?
>
I haven't looked into an FFT algorithm. I'll have to read up on that,
but what do you mean with reverb? Would you feed the loop into a
reverb or apply some reverberant filter before looping?
Thanks,
_Spencer
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