3-pole avtive filter in Emu 1212m

Computer Audio Asylum

Music servers and other computer based digital audio technologies.

Re: my previous posts. Below are are commeents in diyhi.org

sidiy wrote:
I don't know if a single pole filter can do the trick for delta-sigma DACs, even when talking about the AK4396... one trick is to evaluate the results of the change by listening to headphones, especially at low level signals...
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Your advice to listen to the thing is good, that is what every designer should do, and it's part of the development process.
Most voltage output delta-sigmas already have an internal 100Khz lowpass filter, and some are already 2nd order.
A simple external 1st order RC above 100Khz will be enough in most cases, and in some cases you can even skip this.
These days, delta-sigma dacs (with integrated DF) are all 8x oversampling.
An external 3rd order filter is too much of a too muchness, if the dac chip already has an internal second order lowpass.
Filteritis aguditis just kills the sound. But can improve the SNR specs, though. Looks good on paper...
Specs, specs...
_________________
Carlos Filipe
"It's a matter of striking the notes at exactly the right moment". Bach (a low jitter guy).

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Topic - 3-pole avtive filter in Emu 1212m - fmak 21:40:17 02/15/07 (6)

dac inside 1212 is not AKM - Kiepu 09:50:40 02/17/07 (0)

3rd order is not the same thing as 3 pole (nt) - Christine Tham 14:35:21 02/16/07 (4)

Re: 3 pole whatever order is band limiting - fmak 02:56:08 02/17/07 (3)

Give it up, fmak - Christine Tham 13:43:09 02/17/07 (2)

Re: Give it up, fmak-You don't seem to understand effects of filters - fmak 22:06:20 02/17/07 (1)

I certainly don't understand the effects of non-existent filters (nt) - Christine Tham 22:18:34 02/17/07 (0)

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