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View Poll Results: Which file is the naturally distorted one?
xover1 1 33.33%
xover2 2 66.67%
I can not differentiate them. 0 0%
Voters: 3. You may not vote on this poll

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Old 5th December 2014, 10:47 AM   #1
Elvee is offline Elvee  Belgium
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Default Is timing important for crossover distortion?

As I promised in this thread, I have prepared a little test to try to determine if the phasing of harmonics plays a role in the perception of Xover distortion.

Test files are in the zipped folder attached to this post.

The test consists of a 1KHz sinewave affected by Xover dist. The amount of distortion is severe, but not caricatural: the transistors are just underbiased.
The resulting sound is highly strident and unpleasant; no surprise there.

I have then created a second signal, completely similar, except the phases of the harmonics are reshuffled completely randomly (based on a random number generator).

Can you spot a difference, and if yes, can you tell the "natural" sound from the "artificial" one?

Please, try to refrain from cheating, and don't look at the .wav files, just listen to them.
Personally, at first I heard no difference (on my lousy PC speakers).
I then tried with headphones, and there I could reliably detect a more strident version.

I will probably repeat the test at other frequencies
Attached Images
File Type: png XoverTests4.png (122.5 KB, 119 views)
Attached Files
File Type: zip Test1.zip (50.7 KB, 2 views)
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Last edited by Elvee; 8th December 2014 at 02:37 PM.
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Old 7th December 2014, 09:16 AM   #2
Elvee is offline Elvee  Belgium
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No-one feeling up to the challenge?

One day left and the files will disappear for ever...
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Old 7th December 2014, 09:29 AM   #3
Mooly is offline Mooly  United Kingdom
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First time I've seen this but I'll give them a listen.

(Elvee, these file hosting sites are a nightmare, maybe that's why you have had no takers... this ones average... slow, unintuitive, asks for codes, asks you to create links that are only valid for so long, have to wait before you can down load the next file hint maybe use Dropbox next time )
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Old 7th December 2014, 09:40 AM   #4
Mooly is offline Mooly  United Kingdom
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Elvee, I can differentiate these easily on my laptop speakers every single time and never get them mixed. They are absolutely totally different to listen to. The first is smoother and less harsh by many miles.
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Old 7th December 2014, 10:08 AM   #5
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Location: West Australia, straight over the road from the beach, natural ambient sounds only.
Yeah, they do sound different on my laptop speakers.
Are we testing phasing of distortion components, or hard clipping ???.
Crossover.png

Dan.
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Old 7th December 2014, 10:28 AM   #6
Mooly is offline Mooly  United Kingdom
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I've only just peeked at the files in Audacity now and can see they are both severely clipped... I'm not so sure they are meant to be tbh.

Elvee what are we listening to here ?
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Old 7th December 2014, 10:41 AM   #7
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Lol, Elvee joins your invalid testing club eh Mooly .

Dan.
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Old 7th December 2014, 10:55 AM   #8
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omg so clipped.png
Looks pretty invalid here too.
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Old 7th December 2014, 11:10 AM   #9
Mooly is offline Mooly  United Kingdom
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Quote:
Originally Posted by Max Headroom View Post
Lol, Elvee joins your invalid testing club eh Mooly .

Dan.
Well I made a few mistakes for sure, but I learnt much from Pavel on producing files, and one of the main things being that nothing gets past you guys and your file analysis.
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Old 7th December 2014, 11:15 AM   #10
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This is a classic example of a nonlinearity converting changes in harmonic phase into changes in amplitude. The hard clipping makes the phase audible.
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