Re: Sample-rate conversion
Re: Sample-rate conversion
- Subject: Re: Sample-rate conversion
- From: James McCartney <email@hidden>
- Date: Wed, 4 Feb 2004 14:51:16 -0800
On Feb 4, 2004, at 8:55 AM, Marc Poirier wrote:
That will help, and lowpassing any frequencies that would be above the
new
Nyquist before doing the interpolation is required for decent results,
too. Probably the easiest is to just use the AudioConverter APIs in
OS X,
which are highly optimized and also are, in some people's opinion, the
best sounding sample rate conversion algorithms yet.
Marc
doesn't go up to 3.5 MHz however.
This sounds like PWM audio.
http://www.superaudio-cd.com/technology3.html
http://www.superaudio-cd.com/technology11.html
You need a really big lowpass filter / decimator because you need to
lower the sampling rate by about 6.3 octaves.
Cubic interpolation is not a good answer here because that is only
useful when changing the sampling rate a small amount and even then it
should only be used if speed is more important than quality.
-
james mccartney
apple coreaudio
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