[asterisk-dev] adjusting the playback speed of voicemail messages.

[Michael Grigoni]

John Todd wrote:

<snip>

> I don't know 
> enough about how JACK works to say what a filter would look like to 
> slow down or speed up audio without distorting the pitch.  Let us 
> know if this is the right solution, and the methods and details of 
> any successful tests!

This thread got me to do a quick search for implementations of
variable speech control (hopefully public domain or open source)
but not much is out there.  U.S. Patent filing 4,864,620 contains
MS C 4.0 code for an implementation that should be testable on
a DOS machine.

Michael