Few sample rate conversion questions
Few sample rate conversion questions
- Subject: Few sample rate conversion questions
- From: "Mike Kluev" <email@hidden>
- Date: Wed, 24 Dec 2008 11:30:42 +0300
I have few interrelated questions about sample rate conversion.
1) The documentation states that AUVarispeed unit changes pitch as
well as speed:
<<A unit that lets you change the speed of playback (and consequently
the pitch as well)>>.
Yet, in the CAPlayThrough sample there is the following comment:
//Q:Why do we need a varispeed unit?
//A:If the input device and the output device are running at different
sample rates
//we will need to move the data coming to the graph slower/faster TO
AVOID A PITCH CHANGE.
Is this comment just not correct and it rather should be "to introduce
a pitch change"?
2) Wouldn't it be better to use AUTimePitch instead of AUVarispeed in
this sample
and other code for similar purposes on the grounds that AUTimePitch
can change
the speed of playback without altering the pitch?
3) For the purposes of sample rate conversion are AUConverter and
AUVarispeed
equally good? (Capable to handle the same set of input/output rates,
same quality, etc)
Mike
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