Re: Pitch shift with Core Audio/RemoteIO on iPhone
Re: Pitch shift with Core Audio/RemoteIO on iPhone
- Subject: Re: Pitch shift with Core Audio/RemoteIO on iPhone
- From: "tahome izwah" <email@hidden>
- Date: Tue, 13 Jan 2009 06:57:35 +0100
Pitch shift is a bit tricky to implement (see
http://www.dspdimension.com/category/tutorial/ for source code) but if
you only need resampling without maintaining speed and don't care too
much about quality linear interpolation is the easiest to implement,
sounds ok and is as fast as it gets.
--th
2009/1/12 Stefan Alder <email@hidden>:
> I'm considering using RemoteIO directly rather than OpenAL and wondering how
> best to implement real-time pitch shift functionality. Its ok if the sound
> is sped up, so I assume I need to resample the source data before copying it
> to the buffer. The question is what algorithm should I use to resample so
> that cpu is conserved and quality remains reasonable high.
> Thanks for any advice.
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