Variable-Variable Speed Playback
Variable-Variable Speed Playback
- Subject: Variable-Variable Speed Playback
- From: Wayne Anderson <email@hidden>
- Date: Mon, 11 Jul 2005 17:33:44 -0600
I need to vary the playback speed of a sound sample where the speed
is controlled by a mathematical curve.
That is, the instantaneous playback speed is proportional to the
instantaneous slope of the curve.
Assuming the slope is always positive, the varispeed audio unit seems
like a good choice for this.
To use it, I plan to use an algorithm that maps a set of straight
line segments to the curve.
The slope of each segment is proportional to one of the available
discrete steps on the varispeed unit.
My questions are as follows:
1) What are the limitations, if any, on real time programatic setting
of the speed while playing?
2) what are the actual discrete settings that the unit can accept?
The default interface implies that the minimum unit is Cents, Is
this really the internal resolution?
Are there preferred increments or "magic numbers" that improve
performance and/or output quality?
3) what are the differences between the highest and lowest quality
settings?
What about the more general problem of curves that have slopes that
can go both positive and negative.
That is, the playback speed would vary and possibly reverse with some
varying speed.
Any information or thoughts on this problem would be greatly
appreciated.
Wayne
__________________________________
Wayne Anderson
Red Rock Software, Inc.
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