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Analog Delta-Sigma interpolation DAC
Analog Delta-Sigma interpolation DAC
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Old 27th February 2021, 08:39 AM   #391
Hans Polak is offline Hans Polak  Netherlands
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Hayk,
You could use this free filter sotware tool, to produce all kind of linear phase, minimum phase or whatever type of filter.

rePhase - Official Site - Free FIR filtering tool

Also look here where they managed to create a minimum phase filter with no pre ringing and nearly only one post wave, by stacking mininum phase filters with a distance of 2Khz.

Filter brewing for the Soekris R2R

Hans
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Old 27th February 2021, 09:14 AM   #392
Hans Polak is offline Hans Polak  Netherlands
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You should ask them for the details how they managed to use rePhase in combination with other programs to get this impulse response.

Hans
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Old 27th February 2021, 10:47 AM   #393
U130421 is offline U130421  Antarctica
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I could make very easily non pre ringing interpolator, the image rejection is a disaster.
no prering.JPGt
nonring.JPG
The frequency response of the impulse you show is ridiculous as mine, -25db at 30khz.
Click the image to open in full size.

Last edited by U130421; 27th February 2021 at 11:14 AM.
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Old 27th February 2021, 11:13 AM   #394
U130421 is offline U130421  Antarctica
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The rephase software I have it downloaded in early January, brickwall linearphase 21khz, needs 16k samples,
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Old 27th February 2021, 11:24 AM   #395
TNT is offline TNT  Sweden
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Analog Delta-Sigma interpolation DAC
With 4k taps you can do -185dB at 22.049 if you can accept say -0.1 dB down at 17k.

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Old 27th February 2021, 11:34 AM   #396
Hans Polak is offline Hans Polak  Netherlands
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Quote:
Originally Posted by kokoriantz View Post
I could make very easily non pre ringing interpolator, the image rejection is a disaster.
Attachment 926731t
Attachment 926732
The frequency response of the impulse you show is ridiculous as mine, -25db at 30khz.
True, but this was also the case with the T+A DAC test that I showed a number of postings ago #367.
But nevertheless, the reviewer preferred this filter.
So it’s a brickwall and somewhat cooler sound or a friendlier rol off of a minimal phase filter and “better” sound.

Hans
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Old 27th February 2021, 11:48 AM   #397
Hans Polak is offline Hans Polak  Netherlands
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Join Date: Mar 2005
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A Blackman Harris window also looks attractive to use when playing with rePhase.
Very smooth with a large stopband supression.

Hans
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Old 27th February 2021, 12:19 PM   #398
U130421 is offline U130421  Antarctica
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I have several of those nos USB stick soundcards that cost a $ or two. They all have harsh sound, I use to transform the Laptop into generator/scope.
I will study a more important aspect than the ringing, The transient 20khz. It needs three cycles to reach the steady state. I will see what I get with 60 samples.
The arrow shows the start of 20khz.
30p.JPG
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Old 27th February 2021, 02:18 PM   #399
Hans Polak is offline Hans Polak  Netherlands
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More samples means more pre and post ring cycles.
Maybe you can try the added N+1 and N-1 trick to reduce ring cycles.

Hans
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Old 28th February 2021, 05:06 AM   #400
U130421 is offline U130421  Antarctica
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The result with 60 samples is worst. How about reducing to 20?
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