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Bernhard,

Even I am curious to know if there are any such ADC.I do agree with Jeff the need for the
external filter.

Thanks,

radha meka
________________________________

From: a...@yahoogroups.com on behalf of Jeff Brower
Sent: Fri 10/6/2006 5:23 AM
To: Bernhard Holzmayer
Cc: a...@yahoogroups.com
Subject: Re: [audiodsp] How to impoverish the FFT of a sound and keep the same sampling rate at
once ?

Bernhard-

> thanks for pointing this out. I agree in most of what you say.
>
> My intention, however, was to keep things as simple as possible.
>
> Besides, a broad variety of sigma-delta ADCs has the antialiasing filter
> incorporated. In combination of a common analog front end including OP-amp
> based decoupling stage and preamplifier which cannot handle frequencies much
> higher than 20kHz, an explicit anti-aliasing filter is dispensable.

Can you point out one such sigma-delta ADC?  I would like to know, as the high-end
converters we use -- Cirrus, AKM, TI (Burr-Brown) -- all need at least a simple 1 or
2-pole RC external filter.

-Jeff

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