[sdiy] Sigma Delta DSP

[Dave Krooshof - dendriet.nl]

Hi List,

I was wondering weather anyone here has knowledge about
sigma delta processing. We allready bought a AD convertor,
and we are interested in using the bitstream output directly.
Converting back to analog is nothing more then a low pass, so
that is easy.

Since you can edit sound clickfree in a bitstream, pitchshifting
without taking care of windowing/granular is interesting.
Hardwarewise, we need a delay, that can delay about
300000 samples and can be set to any delaylength at any time
to do DSP directly in the bitstream. Does anyone know of
such a chip?


The downside however, is that I would not even know how to
do gain properly in a bitstream, let alone filtering.
I do have a good understanding of the SA-CD like audio signal itself.
And I know quite a lot about statistics and calculating probabilies.
Yet, how to do DSP in a bitstream is still vage to me.

Can anyone point us to information about bistream DSP?
Did anyone here program any bitstream DSP application?

Thanks!

Dave


--
http://www.dendriet.nl
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