Re: Pitch-Shift on the iPhone
Re: Pitch-Shift on the iPhone
- Subject: Re: Pitch-Shift on the iPhone
- From: Richard Dobson <email@hidden>
- Date: Fri, 06 Mar 2009 12:26:07 +0000
Hamish Allan wrote:
On Fri, Mar 6, 2009 at 11:54 AM, Richard Dobson
<email@hidden> wrote:
There is one fundamental distinction however: you can pitch-scale a live
stream directly (using say the dspdimension code), but timescaling
ostensibly has to be an offline (file-based) process.
Could you not take the dspdimension pitch shifting approach but
"resample" in the frequency domain (i.e. re-bin before the IFFT step)
to achieve online timescaling?
Hamish
Well, if you are slowing down, you pile up incoming audio, possibly
infinitely (speed 0.5: 5 secs in --> 2.5 secs out), or conversely you
run out of input if you try to speed up (audio hasn't arrived yet). Or
did you have some other mechanism in mind? Short one-shot sounds? That
would be a rapid-turnover but technically offline process.
Important also not to conflate timescaling (making sounds
shorter/longer) with sample-rate conversion; the latter can of course be
done in real-time (and even variably), as many soft and hardware units
testify.
Richard Dobson
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