Tim Wescott <[email protected]> writes:
> AL wrote:
> > Hi, I'm a university student studying Electronics Engineering and
> > Bournemouth University in England. For my final year project I
> > need to understand how CD mixers work. I know they alter the
> > sample rate to change the speed (pitch) of the track being output
> > thus allowing the DJ to mix the tracks (getting the tempo's to
> > match). How is this done? Are there specific DSP processors to
> > alter the sample rate? Or can any standard audio DSP processor be
> > programmed to perform this task? Any help/advice/website links
> > greatly appreciated!
> >
> It's not just changing the sample rate -- you need to alter the tempo
> without throwing the music out of tune. That's going to be much more
> sophisticated (and if you find a web site let me know).
>
> This is just the sort of thing that a standard DSP processor is made
> for, given the right software.
>

Audacity can do this on a PC hardware (not in real time on my old
Celeron box!) It's open-source so the OP should be able to glean some
info from it in theory...

Cheers,
Martin

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