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Re: [Cs-dev] [Csnd] Experiences with audio on DVD 24/96

Date2006-09-29 01:58
From"Michael Gogins"
SubjectRe: [Cs-dev] [Csnd] Experiences with audio on DVD 24/96
I rendered the same piece that I had used in my earlier WinABX test, only 
with reverb added. Both renderings used Csound 5, 64 bit sample version, at 
ksmps=1. Orchestra and score were completely identical. The only difference 
was that the first rendering was at 44,100 cycles per second to a 16 bit 
stereo soundfile, and the second rendering was at 96,000 cycles per second 
to a float stereo soundfile.

I was not confident that I could tell the difference at every point in the 
soundfile, but there many sections were I could zero in on obvious 
differences. As the test results below show, in those cases I could hear a 
clear difference between the renderings _in every single guess_.

Both renderings were subjectively of crystal clarity, even in the highest 
highs. Subjectively, perhaps the 32/96 rendering was clearer, i.e. less 
muddy, in the midrange where most of the notes were happening.

The main difference is that the actual Csound instrument sounds were 
different in the two pieces. In a number of cases there were notes that were 
audibly louder in one rendering than in the other, or at a slightly 
different pitch. I think the most reasonable explanation for this is the 
difference in sampling rate.

Note that this test is not a pure test of difference in soundfile bandwidth. 
Csound instruments evidently behave differently at different sampling rates. 
But I think that this test is still a pretty convincing argument for 
rendering at high bandwidth.

I will try this test again by making a 32/88200 soundfile, and then 
converting it to a 16/44100 soundfile. I suspect that that difference will 
be quite a bit harder to hear.

Regards,
Mike

WinABX v0.42 test report
09/28/2006 20:19:23

A file: 
D:\utah\home\mkg\projects\csoundabx\f--2002-01-28--17-37-42.042.mml.1644.csd.wav
B file: 
D:\utah\home\mkg\projects\csoundabx\f--2002-01-28--17-37-42.042.mml.3296.csd.wav

Start position 00:00.0, end position 03:59.3
20:30:44    1/1  p=50.0%
20:30:54    2/2  p=25.0%
20:31:08    3/3  p=12.5%
20:31:27    4/4  p=6.2%
20:31:39    5/5  p=3.1%
20:31:49    6/6  p=1.6%
20:32:08  reset

Start position 00:19.5, end position 00:26.3
20:34:08    1/1  p=50.0%
20:34:31    2/2  p=25.0%
20:34:47    3/3  p=12.5%
20:34:57    4/4  p=6.2%
20:35:08    5/5  p=3.1%
20:35:21    6/6  p=1.6%
20:35:33  reset

Start position 02:34.3, end position 02:39.1
20:41:41    1/1  p=50.0%
20:41:52    2/2  p=25.0%
20:42:13    3/3  p=12.5%
20:42:29    4/4  p=6.2%
20:42:37    5/5  p=3.1%
20:42:46    6/6  p=1.6%
20:42:53    7/7  p=0.8%
20:43:01    8/8  p=0.4%
Start position 02:52.9, end position 02:57.1
20:44:06    9/9  p=0.2%
20:44:18  10/10  p< 0.1%
20:44:23  11/11  p< 0.1%


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