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Filter brewing for the Soekris R2R
Filter brewing for the Soekris R2R
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Old 10th April 2018, 06:25 AM   #1451
bambadoo is offline bambadoo  Norway
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Originally Posted by pos View Post
Soren, have you tried the different Albretch windows in rephase?
I have and I truly liked it
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Old 19th April 2018, 05:27 PM   #1452
bambadoo is offline bambadoo  Norway
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Originally Posted by soekris View Post
The dam1021 and dam1121 will follow just after the easter vacation, they take a little more time as those are older than the current dac1421/dac1541 firmware.
Any news here ?
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Old 1st June 2018, 07:28 AM   #1453
PET240 is offline PET240  Australia
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Question,

Have only just ordered my board, bit slow on the uptake, have been looking about, is there a way to just play music with the original sample rate and not use the upsampling in the DAC FPGA?

From what I have read the "NOS" filter still uses the upsampling side.

Whats are the options here please? Have tried searching but haven't found a search term that answers my question yet.

Thanks in advance,

Drew.
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Old 1st June 2018, 08:17 AM   #1454
Dimdim is offline Dimdim  Greece
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Filter brewing for the Soekris R2R
Short answer is "no". You need to let the FPGA do its job in order to drive the R-2R ladder. That constitutes upsampling.

The "NOS" filters bypass the "first stage" of upsampling, but there is no way to bypass the "final stage".
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Old 2nd June 2018, 03:37 AM   #1455
PET240 is offline PET240  Australia
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OK, didn't realise there was 2 rounds of upsampling!

Thanks Dimdim!

Have you tried the "NOS" filter? Personal favourite? Upsampling in the DAC preferrred or use external method and just feed 352/384?

Thanks,

Drew.
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Old 4th June 2018, 12:27 PM   #1456
oneoclock is offline oneoclock  Europe
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Quote:
Originally Posted by Dimdim View Post
Short answer is "no". You need to let the FPGA do its job in order to drive the R-2R ladder. That constitutes upsampling.

The "NOS" filters bypass the "first stage" of upsampling, but there is no way to bypass the "final stage".
There are sets of filters like the one I have configured, or the one of Bambado, that have the F7 NOS filter in both the FIR1 and the FIR2 filters. Then, selecting F7, behaves like an authentic DAC NOS without oversampling. The "final stage" second oversampling behaves in that case just as the first oversampling, it take F11 NOS filter, does not perform oversampling. And it can be verified with an oscilloscope.
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Old 4th June 2018, 12:32 PM   #1457
PET240 is offline PET240  Australia
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Hey oneoclock,

That excites me!

I take it if I search this thread for you and bambado I would find a link to download or have you not shared them as yet?

If you haven't, may I please grab whichever one or both please?

Thanks muchly,

Drew
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Old 7th June 2018, 09:13 PM   #1458
oneoclock is offline oneoclock  Europe
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Old 10th June 2018, 10:28 PM   #1459
kronzilla is offline kronzilla  Belgium
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I ordered a couple weeks ago my dam1021 but wich firmware has the board? Ik hope the last one.....? I want the best sound only from cd with i2s so no hocus pocus giga mega upsampling or so.... Just the best sound from this dac....
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Old 10th June 2018, 11:04 PM   #1460
TNT is offline TNT  Sweden
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