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Old 22nd December 2003, 01:16 PM   #1
esl is offline esl  Poland
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Default AD-21065L as a digital filter

Hello,

Well it's been months since my two AD21065L have arrived,
so I decided to make use of them, at the long last.

Anyone tried to use it as a digital filter in a DAC?

What kinds of filtering would I actually need? I ask because
I wonder about the complexity of programming requred to
get this Sharc do what I want.

I assume, I would need: IIR filtering, some kind of resampling
(upsampling to 88.2 4 example), maybe dithering, maybe
some form of group delay-correction?

What would you say?

I already have some AD1896, but I do not want to use them
unless I have to (in context of Sharc they would be usefull
just because I would have the same bitrate, bitdepth signal
delivered to my AD-21065L).

Could anyone provide me with some information (links) on
various upsampling/interpolation/dithering/group-delay
correction alghoritms?

What do you this about all this?

Thanks,

esl
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Old 31st December 2003, 01:35 PM   #2
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I think it's very difficulty. I work with ADSP SHARK family for a long time and I often encounter with noise troubles. This DSP has wide noise spread which raise up to 10 GHz. The components of this noise flows throught digital ground plane and destabilizes functioning of other devices which connected to digital ground plane. One of the way to solve this problem is separating of the digital ground plane to several parts such as DGND, DSPGND, and shielding of the DSP. Also, DSP ports have significant aperture uncertainty which increase output signal jitter.
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Old 14th January 2004, 12:25 PM   #3
esl is offline esl  Poland
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Hi,
apart from the noise problems do you think that this dsp would
be usable for such application?
As for mentioned aperture uncertainty... this could be a problem,
because - in theory - I could use ASRC *after* DSP, but I feel
that it would end-up with too much signal manipulation.

Is there any other solution to get rid of jitter without using ASRC..
.. any FIFO, whatever?

Cheers,

esl
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