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Search: Keyword(s): ; Posts Made By: Kees de Visser
Forum: Audio theory, Setup and Chat   08-18-2014, 02:26 PM
Replies: 214
Views: 13,751
Posted By Kees de Visser
I partly agree. It is however the responsibility...

I partly agree. It is however the responsibility (competence if you like) of the operators to verify that the software they use doesn't produce errors. If it does, the errors should be fixed or they...
Forum: Audio theory, Setup and Chat   08-18-2014, 07:06 AM
Replies: 214
Views: 13,751
Posted By Kees de Visser
I did warn...

I did warn (http://www.avsforum.com/forum/91-audio-theory-setup-chat/1585994-avs-aix-high-resolution-audio-test-ready-set-go.html#post25400138) Scott though within 24h after publishing the first test...
Forum: Audio theory, Setup and Chat   08-14-2014, 05:26 AM
Replies: 456
Views: 15,974
Posted By Kees de Visser
I'm not up to date on all the past discussions,...

I'm not up to date on all the past discussions, so I hope this isn't redundant or universally debunked.[/quote]It has been debunked I'm afraid.
According to J.D. (jj) Johnston, who follows this...
Forum: Audio theory, Setup and Chat   08-12-2014, 05:40 AM
Replies: 456
Views: 15,974
Posted By Kees de Visser
This URL...

This URL (http://www.avsforum.com/forum/91-audio-theory-setup-chat/1585994-avs-aix-high-resolution-audio-test-ready-set-go.html#post25383978) is the original post about the test.

AFAIK users are...
Forum: Audio theory, Setup and Chat   07-23-2014, 06:46 AM
Replies: 214
Views: 13,751
Posted By Kees de Visser
Hi Scott, perhaps I've missed it, but has been...

Hi Scott,
perhaps I've missed it, but has been specified what kind and what level of dither has been applied (for both down- and up-conversion) ?
The 16-bit dither in "On The Street" and "Mosaic"...
Forum: Receivers, Amps, and Processors   07-12-2014, 12:40 AM
Replies: 8,205
Views: 278,451
Posted By Kees de Visser
Newbie question: is Atmos only used for sound for...

Newbie question: is Atmos only used for sound for picture, or are there plans for music-only releases as well ?
Forum: Audio theory, Setup and Chat   07-03-2014, 11:48 PM
Replies: 2,919
Views: 70,950
Posted By Kees de Visser
I have just tested the validity of the supplied...

I have just tested the validity of the supplied source material. Similar to making sure the med lab instruments are sterile :) Sorry if this wasn't clear.
Forum: Audio theory, Setup and Chat   07-03-2014, 02:14 PM
Replies: 2,919
Views: 70,950
Posted By Kees de Visser
Not a difference file, but a difference mix: the...

Not a difference file, but a difference mix: the real time output of the DAW mixer. The advantage is that every adjustment can be heard right away. If two files are identical, the mixer output will...
Forum: Audio theory, Setup and Chat   07-03-2014, 01:32 PM
Replies: 2,919
Views: 70,950
Posted By Kees de Visser
I somehow expected that :) OK. Use any DAW,...

I somehow expected that :)
OK. Use any DAW, open both stereo files in a 4-track project and do a nulltest (inverse polarity of one pair, mix them and listen to the master output). Now align them to...
Forum: Audio theory, Setup and Chat   07-03-2014, 11:38 AM
Replies: 2,919
Views: 70,950
Posted By Kees de Visser
I found the level difference of 0.2dB between...

I found the level difference of 0.2dB between Scott's testfiles by ear. I can't hear ultrasound, so that value might be different for others who can hear ultrasound, although I doubt it.
What...
Forum: Audio theory, Setup and Chat   07-03-2014, 04:36 AM
Replies: 214
Views: 13,751
Posted By Kees de Visser
Isa, AFAIK Sonic SRC uses fixed point...

Isa, AFAIK Sonic SRC uses fixed point calculations, which means that clipping a signal is destructive and final. Most modern SRCs use floating point, which allows lowering >0dBFS signals without loss...
Forum: Audio theory, Setup and Chat   07-01-2014, 08:42 PM
Replies: 214
Views: 13,751
Posted By Kees de Visser
You should look at the track peak values (higher...

You should look at the track peak values (higher is louder). Sorry for being vague. I'm trying not to spoil the test for those who don't use an ABX application :)
Forum: Audio theory, Setup and Chat   07-01-2014, 07:41 PM
Replies: 214
Views: 13,751
Posted By Kees de Visser
Scott, I find the difference to be consistent....

Scott, I find the difference to be consistent. Can you please re-check ?
It would make sense though, since many SRCs create a bit of headroom to prevent filter ripple from creating overloads. It's...
Forum: Audio theory, Setup and Chat   06-30-2014, 11:00 PM
Replies: 214
Views: 13,751
Posted By Kees de Visser
Scott, I noticed two problems with the testfiles:...

Scott, I noticed two problems with the testfiles:

1) The pairs are not sample accurately aligned. This is essential for seamless ABX switching.
2) There is a 0.2 dB level difference between the...
Forum: Audio theory, Setup and Chat   06-28-2014, 02:15 AM
Replies: 2,919
Views: 70,950
Posted By Kees de Visser
I suppose that's Harman? Interesting. What do you...

I suppose that's Harman? Interesting. What do you think of Sean Olive's (Manager of Subjective Evaluation) introduction of formalized, double-blind product testing around 1994?
Forum: Audio theory, Setup and Chat   06-20-2014, 01:49 AM
Replies: 2,919
Views: 70,950
Posted By Kees de Visser
Our perception of noise must be very different.

Our perception of noise must be very different.
Forum: Audio theory, Setup and Chat   06-18-2014, 11:13 PM
Replies: 231
Views: 8,355
Posted By Kees de Visser
Luckily quite a few are excellent, so there is...

Luckily quite a few are excellent, so there is hardly any excuse for not using a near-perfect SRC. These tests were done in the digital domain. You can see that artifacts are at a very low level,...
Forum: Audio theory, Setup and Chat   06-18-2014, 02:36 PM
Replies: 2,919
Views: 70,950
Posted By Kees de Visser
Arny, jitter values are usually expressed in...

Arny, jitter values are usually expressed in seconds (ns, ps etc.). Can you give the jitter levels of your 5 testfiles ?
Forum: Audio theory, Setup and Chat   06-16-2014, 01:04 AM
Replies: 2,919
Views: 70,950
Posted By Kees de Visser
Ashihara used a jitter simulator for the study....

Ashihara used a jitter simulator for the study. Are we (all) in agreement that jitter simulation is a valid option for listening tests? Of course it requires "jitter profiles" and that's another...
Forum: Audio theory, Setup and Chat   06-15-2014, 01:55 AM
Replies: 2,919
Views: 70,950
Posted By Kees de Visser
It's not just for DSD fans :), but wouldn't it...

It's not just for DSD fans :), but wouldn't it make sense to specify both 500kHz and 20kHz bandwidth results ? (assuming there is more perceptual relevance in the latter)
Forum: Audio theory, Setup and Chat   06-15-2014, 01:12 AM
Replies: 65
Views: 1,753
Posted By Kees de Visser
From the Alstine website: To me it...

From the Alstine website:


To me it doesn't make sense to invest a lot (!) of time in listening tests without knowing the limitations of the test device. If you don't take DBTs seriously, stay...
Forum: Audio theory, Setup and Chat   06-14-2014, 06:25 AM
Replies: 2,919
Views: 70,950
Posted By Kees de Visser
Ironically the dynamic range of most audio...

Ironically the dynamic range of most audio recordings is worse than that.[/QUOTE]That's likely the reason why ASHIHARA et al. (Detection threshold for distortions due to jitter on digital audio,...
Forum: Audio theory, Setup and Chat   06-13-2014, 01:57 AM
Replies: 2,919
Views: 70,950
Posted By Kees de Visser
In pro-audio equipment this is rather common...

In pro-audio equipment this is rather common practice. I bought my Prism DA in 1996 and it has a "master clock" mode where the DAC runs at its internal clock and external equipment has to be slaved....
Forum: Audio theory, Setup and Chat   06-11-2014, 11:03 PM
Replies: 283
  Jitter
Views: 6,083
Posted By Kees de Visser
Out of curiosity: are you using speakers or...

Out of curiosity: are you using speakers or headphones to check for the audibility of jitter effects? There is some evidence that headphones are better for this purpose (Kaoru Ashihara...
Forum: Audio theory, Setup and Chat   06-10-2014, 11:31 PM
Replies: 2,919
Views: 70,950
Posted By Kees de Visser
Quote:Originally Posted by...

Quote:Originally Posted by RobertR http://www.avsforum.com/img/forum/go_quote.gif (http://www.avsforum.com/t/1532092/debate-thread-scotts-hi-res-audio-test/480#post_24816228)

When you say that...
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