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Old 22nd February 2015, 08:54 AM   #171
Zoran is offline Zoran  Serbia
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sorry...
what is the .SKR files uploaded there on the first few pages
and how can I open them on mac osx?
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Old 22nd February 2015, 08:55 AM   #172
TNT is online now TNT  Sweden
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They are binary files to be loaded into the DAM. They shall not be opened as they are target files. Thescript that produce them run only on windows.

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Old 22nd February 2015, 11:33 AM   #173
Zoran is offline Zoran  Serbia
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aha -
i presume so but it is better to ask, thanks
Could it be posibile to show pictures of the phase graphs, the same measurements of transfer funct?
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Old 22nd February 2015, 11:35 AM   #174
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A filter has level and phase properties so I think it is a fair request.

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Old 22nd February 2015, 12:35 PM   #175
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Quote:
Originally Posted by TNT View Post
A filter has level and phase properties so I think it is a fair request.

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Knock yourself out.

Maybe you can knock together some commentary on the impact of filter phase linearity on audio quality too ?

Last edited by spzzzzkt; 22nd February 2015 at 12:37 PM.
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Old 22nd February 2015, 12:38 PM   #176
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I presented phase plots for the filters I uploaded. Some present reasoining that the earbrain is sensitive to phase up to 4-5 khz.

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Old 22nd February 2015, 09:05 PM   #177
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Hi there.
Have tried different filters and I am in the process of "filter brewing" myself.
Feel free to try.

Notice: Fairly new to this but I think it sounds good.
However with some of these filters the difference in sound is quite marginal.

Impulse response is done with audacity.

The 22.050khz is down at -80db or so. A minimal phase combined with linear. Little faceshift in the 2-5khz region.
We are down -1db at 20khz.

The .rephase file, .txt and .skr are in the zip..

Hopefully I am doing this right?

EDIT: Looks like it is somewhat similar to leehans IP filter
Filter brewing for the Soekris R2R

Havent tried that one yet.

Best regards
Attached Images
File Type: png impulse.PNG (9.6 KB, 409 views)
File Type: png rephase.PNG (66.7 KB, 415 views)
File Type: png rephase2.PNG (76.3 KB, 403 views)
Attached Files
File Type: zip 4thtry_combined.zip (22.8 KB, 40 views)

Last edited by bambadoo; 22nd February 2015 at 09:09 PM. Reason: Noticed leehans IP filter....
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Old 22nd February 2015, 10:27 PM   #178
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I tried all filters. The best sounding in my opinion is 1021MinPhaseSlowrev1.skr of spzzzzkt. And also those measures i has made are best.

But there is a problem with the measures. All filters of 44,100, 88, ... 352 have noise, saturation, rounding....?
I see in all measures i made, 1k, jitter j-Test, or 19 kHz. -12 DB + 20 khz. -12 dB.
So I gather that is 352 F2 filter problem.
This problem does not occur in 48, .... 384 kHz. measures.

Spzzzzkt please could you design a filter F2 352 kHz. with similar characteristics to 1021MinPhaseSlowrev1 44,100?
Attached Images
File Type: jpg 19-20-44.jpg (122.5 KB, 400 views)
File Type: jpg 19-20-88.jpg (98.7 KB, 388 views)
File Type: jpg 19-20-352.jpg (107.9 KB, 92 views)
File Type: jpg 19-20-48.jpg (102.9 KB, 86 views)
File Type: jpg 19-20-96.jpg (95.2 KB, 77 views)
File Type: jpg 19-20-384.jpg (96.7 KB, 77 views)
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Old 23rd February 2015, 02:06 AM   #179
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oneoclock,

I did have a play with the fir2 filters and I think there is some room for improvement. While they are well above audio, I'm not sure what the point of -0.1dB at 100kHz and -80dB at 220kHz.

I need to check the interaction between the fir1 filters before I post anything up.


In the interim I'm going to post this up TNT-style because I suspect there is a bit of expectation bias happening. This is slightly different approach to what I've posted up so I'd be interested to hear any comments.
Attached Files
File Type: zip 1021SA1.skr.zip (4.8 KB, 31 views)
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Old 23rd February 2015, 03:35 AM   #180
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This is revision of the previous filter. The passband and stop band frequencies have been adjusted slightly. +/- 250Hz or so...

The big change is in FIR2 ( yes, yes, the Norse gods were angered - Thor was making a huge racket outside when I made these changes... ). Your DAM many well disappear into a small black hole, never to be seen again if you install this...

That said, I've changed the passband to 0 - 60kHz, and the stop band starts at 100kHz. TNT will probably complain about the roll-off be I'm sure less bat-eared listeners will be less offended.

cheers
Paul
Attached Images
File Type: png FIR2mods.png (67.0 KB, 140 views)
Attached Files
File Type: zip 1021SA2F2v1.skr.zip (6.8 KB, 38 views)
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