Many thanks Rob.
I'm somewhat puzzled by the grain size being possibly smaller than N (i.e.
2M<N), for that means we lose whole pieces of data (every N-2M per N) in
time domain. Maybe I'm slow to see the truth but right now it just doesn't
feel right to me.
Is there some well accepted rationale how we granulize a piece of speech for
PSOLA? The 2N-rule seems very plausible, for it (combined with Hann window
of 2N) does give an exact block sampling at rate N. It's not the only option
to that effect though.
Cheers,
Xue
-----Original Message-----
From: Robert Bielik
Sent: Monday, October 21, 2013 3:56 PM
To: A discussion list for music-related DSP
Subject: Re: [music-dsp] PSOLA pitch shifting - resample or not?
Hi again Xue,
Robert Bielik skrev 2013-10-19 16:14:
No. The formant is preserved just by NOT resampling the original signal.
The pitch of the signal is only dependent on the periodicity
of each wave "granule", which is pretty much a windowed snapshot of the
original signal with length 2*N where N is the original periodicity.
Further to the point, the windowed granule size should be 2*min(N,M) where N
is original periodicity and M is target periodicity.
Regards,
/Rob
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