[sdiy] Sigma Delta DSP

[James Patchell]

Not quite...to convert back to analog...you need to run the bit stream back 
through another delta sigma conversion...but that is very easy...I have 
verilog code I wrote for doing that on my website...

At 05:45 PM 3/1/2006 +0100, Dave Krooshof - dendriet.nl wrote:
>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>http://www.dendriet.nl

         -Jim
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http://www.oldcrows.net/~patchell

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