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72 software Sample Rate Converters put to the test

John Kenny

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#61
Sorry, here it is the original plots:
https://dropfile.to/msk45

As far as the "missing" colors, they are perfectly superimposed plots.
Thanks for the link
Yea, I got that they were perfectly superimposed but it's knowing which plots they are superimposed on is where the confusion lies - some plots are "bad" & some "good" on the same graph :)
 

bibo01

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#62
Thanks for the link
Yea, I got that they were perfectly superimposed but it's knowing which plots they are superimposed on is where the confusion lies - some plots are "bad" & some "good" on the same graph :)
In each plots colors are always the same:
GREEN
RED
PURPLE
YELLOW
BLUE
WHITE

If you cannot see some of them, it's because they are perfectly superimposed. Usually the missing ones belong to the same family brand.
 

John Kenny

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#63
In each plots colors are always the same:
GREEN
RED
PURPLE
YELLOW
BLUE
WHITE

If you cannot see some of them, it's because they are perfectly superimposed. Usually the missing ones belong to the same family brand.
I understand that but you don't understand what I'm saying - let me give you an example:
In this graph what we see are green, red & white plots
So which of the unseen plots (yellow, blue, purple) overlay the green plot - which overlay the red plot, etc?
I'm presuming blue, yellow & purple all overlay the white plot but I'm not sure?


GREEN = AUI Converter v5.6.3 free - No Dither
RED = AVS Audio Converter v8.1
PURPLE = AVS Audio Editor v8.1 - colorized dither, noise shaping A
YELLOW = AVS Audio Editor v8.1 - colorized dither, noise shaping B
BLUE = AVS Audio Editor v8.1 - gaussian dither, noise shaping A
WHITE = AVS Audio Editor v8.1 - gaussian dither, noise shaping B

P.S.: unseen colors are superimposed



Again in the next plot, I'm not sure where green, red, purple & yellow overlay?

GREEN = AVS Audio Editor v8.1 - Triangular dither, noise shaping A
RED = AVS Audio Editor v8.1 - Triangular dither, noise shaping B
PURPLE = AVS Audio Editor v8.1 - uniform dither, noise shaping A
YELLOW = AVS Audio Editor v8.1 - uniform dither, noise shaping B
BLUE = AVS Audio Editor v8.1 - no dither
WHITE = Awave Studio 10.6 - FIR filter

 

bibo01

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#64
I understand that but you don't understand what I'm saying - let me give you an example:
In this graph what we see are green, red & white plots
So which of the unseen plots (yellow, blue, purple) overlay the green plot - which overlay the red plot, etc?
I'm presuming blue, yellow & purple all overlay the white plot but I'm not sure?


GREEN = AUI Converter v5.6.3 free - No Dither
RED = AVS Audio Converter v8.1
PURPLE = AVS Audio Editor v8.1 - colorized dither, noise shaping A
YELLOW = AVS Audio Editor v8.1 - colorized dither, noise shaping B
BLUE = AVS Audio Editor v8.1 - gaussian dither, noise shaping A
WHITE = AVS Audio Editor v8.1 - gaussian dither, noise shaping B

P.S.: unseen colors are superimposed



Again in the next plot, I'm not sure where green, red, purple & yellow overlay?

GREEN = AVS Audio Editor v8.1 - Triangular dither, noise shaping A
RED = AVS Audio Editor v8.1 - Triangular dither, noise shaping B
PURPLE = AVS Audio Editor v8.1 - uniform dither, noise shaping A
YELLOW = AVS Audio Editor v8.1 - uniform dither, noise shaping B
BLUE = AVS Audio Editor v8.1 - no dither
WHITE = Awave Studio 10.6 - FIR filter

In the first plot PURPLE-YELLOW-BLUE overlay WHITE
In the second plot GREEN-RED-PURPLE-YELLOW overlay BLUE
 

amirm

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#66
I might need a tutor before hand :) BTW did you figure out how to test that junk I sent you yet?
Not yet. Been too busy with this forum I started....
 
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#67
There is also a great Audio Converter for Windows for you to test. This professional software can work at a wide variety of audio formats.

Mod edit: That software is for removal of copy protection from online content. I have edited out the link. If this is not spam, you can follow up by explaining how it relates to work we do here.
 
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#68
Just want to point out null tests will highly favour linear phase resamplers, minimum/intermediate phase settings will screw up the results. Also the potential clipping issue if the conversion and comparison is not being done in floating point.

infinitewave's methodology is more sensible.
 
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#69
Could someone give me a summary for dummies? Is there a preferred algorithm or setting that can be recommended? There is a lot of data here and I don't know how to read the charts.
 
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#70
Just want to point out null tests will highly favour linear phase resamplers, minimum/intermediate phase settings will screw up the results. Also the potential clipping issue if the conversion and comparison is not being done in floating point.

infinitewave's methodology is more sensible.
That is true in both instances.
The null test, if with a minimum phase, involves a greater difficulty of alignment, moreover some resamplers introduce phase rotations at low levels.
If the signal is near 0dBFS, in some cases some samples are shaved off.
There are obviously remedies, so every situation should be verified as it was in this test.
 
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#71
Some people are also skeptical about iZotope's results in infinitewave's website since Alexey Lukin from iZotope is involved with test design.

As a third party test, your results do show that iZotope's SRC is really superb in quality. For linear phase resamplers without any subsample delay and phase change, null test is indeed a very good method to evaluate SRC quality.
 
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#72
As a third party test, your results do show that iZotope's SRC is really superb in quality. For linear phase resamplers without any subsample delay and phase change, null test is indeed a very good method to evaluate SRC quality.
AFAIK most SRCs don't really care about subsample delay (it has no influence on sound quality). iZotope changed the code (Alexey told me) to avoid subsample delay after requests by users who do null tests (like me). It's just cosmetics, but it makes them look better in tests like this.
IMO null tests are meaningless, unless there is no subsample delay (and phase difference).
 
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