Re: [LAU] Pro Audio? OT rant.

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To: <linux-audio-user@...>
Date: Monday, December 24, 2012 - 3:20 am

On Sun, Dec 23, 2012 at 10:05:22PM +0000, Fons Adriaensen wrote:

So artifacts (transient peaks) on the trailing or leading edges of a
square wave is not a form of ringing?

I remember years ago when I was working in Telecom (then Post Office)
and me and another guy were interested in checking out some VHS VCR's,
so we "borrowed" some models which we would return on Monday.

This other guy knew what he was doing and we also had access to quite a
bit of test equipment. One test I remember we did was to feed a square
wave (which was available as a reference signal from the actual o'scope we
were using) into the VCR and view the output on the o'scope. On one
model (Sharp, I think) it was distorted to hell, it looked more like a
bad sine wave than anything resembling a square wave. The weird thing
was that it sounded clearer than the other models, you could hear paper
rustling and clothes brushing against things very clearly.

On another model, the output was not a bad representation of the input
signal, but there were noticeable peaks on the trailing edge of the square
wave. If my memory serves me correctly, he referred to this as ringing,
caused by the filtering stages in the circuitry. Also I remember that he
said that if the peak was on the leading edge it was filtering on the
input stage of the circuitry and if it was on the trailing edge it was
caused by filtering on the output stage of the circuitry.

That test alone made me realise that a simple listening test is not
sufficient. I'm guessing that the Sharp model would produce "listening
fatigue" long before the other model which had minimal distortion on the
output squarewave.

--
"If you're not careful, the newspapers will have you hating the people
who are being oppressed, and loving the people who are doing the
oppressing." --- Malcolm X
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Messages in current thread:
[LAU] Pro Audio? OT rant., John Murphy, (Sat Dec 22, 2:58 pm)
Re: [LAU] Pro Audio? OT rant., Thomas Vecchione, (Sun Dec 23, 1:57 am)
Re: [LAU] Pro Audio? OT rant., John Murphy, (Sun Dec 23, 2:50 pm)
Re: [LAU] Pro Audio? OT rant., Thomas Vecchione, (Sun Dec 23, 5:42 pm)
Re: [LAU] Pro Audio? OT rant., Ralf Mardorf, (Sat Dec 22, 3:43 pm)
Re: [LAU] Pro Audio? OT rant., Len Ovens, (Sat Dec 22, 5:19 pm)
Re: [LAU] Pro Audio? OT rant., Ralf Mardorf, (Sat Dec 22, 5:39 pm)
Re: [LAU] Pro Audio? OT rant., John Murphy, (Sat Dec 22, 8:26 pm)
Re: [LAU] Pro Audio? OT rant., Len Ovens, (Sat Dec 22, 9:00 pm)
Re: [LAU] Pro Audio? OT rant., Ralf Mardorf, (Sat Dec 22, 9:16 pm)
Re: [LAU] Pro Audio? OT rant., Len Ovens, (Sun Dec 23, 3:21 am)
Re: [LAU] Pro Audio? OT rant., Ralf Mardorf, (Sat Dec 22, 5:54 pm)
Re: [LAU] Pro Audio? OT rant., Paul Davis, (Sat Dec 22, 5:44 pm)
Re: [LAU] Pro Audio? OT rant., Ralf Mardorf, (Sat Dec 22, 6:01 pm)
Re: [LAU] Pro Audio? OT rant., Thomas Vecchione, (Sun Dec 23, 1:53 am)
Re: [LAU] Pro Audio? OT rant., Ralf Mardorf, (Sun Dec 23, 11:33 am)
Re: [LAU] Pro Audio? OT rant., Thomas Vecchione, (Sun Dec 23, 5:39 pm)
Re: [LAU] Pro Audio? OT rant., Chris Bannister, (Mon Dec 24, 2:43 am)
Re: [LAU] Pro Audio? OT rant., Ralf Mardorf, (Mon Dec 24, 8:59 am)
Re: [LAU] Pro Audio? OT rant., Ricardus Vincente, (Mon Dec 24, 3:13 pm)
Re: [LAU] Pro Audio? OT rant., Monty Montgomery, (Mon Dec 24, 10:22 pm)
Re: [LAU] Pro Audio? OT rant., Neil, (Mon Dec 24, 11:01 pm)
Re: [LAU] Pro Audio? OT rant., Ricardus Vincente, (Mon Dec 24, 11:31 pm)
Re: [LAU] Pro Audio? OT rant., Neil, (Tue Dec 25, 1:34 am)
Re: [LAU] Pro Audio? OT rant., Fons Adriaensen, (Tue Dec 25, 11:47 am)
Re: [LAU] Pro Audio? OT rant., Fons Adriaensen, (Mon Dec 24, 3:20 pm)
Re: [LAU] Pro Audio? OT rant., Brent Busby, (Mon Dec 24, 4:46 pm)
Re: [LAU] Pro Audio? OT rant., Ralf Mardorf, (Mon Dec 24, 9:12 am)
Re: [LAU] Pro Audio? OT rant., Florian Paul Schmidt, (Mon Dec 24, 9:45 am)
Re: [LAU] Pro Audio? OT rant., Ralf Mardorf, (Thu Dec 27, 12:36 pm)
Re: [LAU] Pro Audio? OT rant., Jeremy Jongepier, (Tue Dec 25, 1:24 pm)
Re: [LAU] Pro Audio? OT rant., Florian Paul Schmidt, (Tue Dec 25, 1:42 pm)
Re: [LAU] Pro Audio? OT rant., Chris Bannister, (Fri Dec 28, 2:35 am)
Re: [LAU] Pro Audio? OT rant., Florian Paul Schmidt, (Fri Dec 28, 10:31 am)
Re: [LAU] Pro Audio? OT rant., Chris Bannister, (Fri Dec 28, 3:05 pm)
Re: [LAU] Pro Audio? OT rant., Jörn Nettingsmeier, (Sat Dec 29, 6:22 pm)
Re: [LAU] Pro Audio? OT rant., Arnold Krille, (Sat Dec 29, 9:18 pm)
Re: [LAU] Pro Audio? OT rant., Florian Paul Schmidt, (Sat Dec 29, 8:54 pm)
Re: [LAU] Pro Audio? OT rant., Jörn Nettingsmeier, (Sat Dec 29, 11:36 pm)
Re: [LAU] Pro Audio? OT rant., Chris Bannister, (Sun Dec 30, 12:08 pm)
Re: [LAU] Pro Audio? OT rant., Fons Adriaensen, (Sun Dec 30, 2:12 pm)
Re: [LAU] Pro Audio? OT rant., Len Ovens, (Sat Dec 29, 6:30 pm)
Re: [LAU] Pro Audio? OT rant., Chris Cannam, (Fri Dec 28, 4:52 pm)
Re: [LAU] Pro Audio? OT rant., Folderol, (Fri Dec 28, 5:31 pm)
Re: [LAU] Pro Audio? OT rant., Chris Cannam, (Fri Dec 28, 11:06 pm)
Re: [LAU] Pro Audio? OT rant., Fons Adriaensen, (Fri Dec 28, 10:51 pm)
Re: [LAU] Pro Audio? OT rant., Al Thompson, (Sat Dec 29, 2:03 am)
Re: [LAU] Pro Audio? OT rant., Fons Adriaensen, (Sat Dec 29, 11:27 am)
Re: [LAU] Pro Audio? OT rant., Al Thompson, (Sat Dec 29, 3:05 pm)
Re: [LAU] Pro Audio? OT rant., Raffaele Morelli, (Fri Dec 28, 11:12 am)
Re: [LAU] Pro Audio? OT rant., Ralf Mardorf, (Thu Dec 27, 2:39 pm)
Re: [LAU] Pro Audio? OT rant., Chris Bannister, (Fri Dec 28, 3:10 am)
Re: [LAU] Pro Audio? OT rant., Ralf Mardorf, (Fri Dec 28, 6:25 am)
Re: [LAU] Pro Audio? OT rant., Jeremy Jongepier, (Fri Dec 28, 1:29 pm)
Re: [LAU] Pro Audio? OT rant., Ralf Mardorf, (Fri Dec 28, 2:53 pm)
Re: [LAU] Pro Audio? OT rant., Gene Heskett, (Fri Dec 28, 7:13 am)
Re: [LAU] Pro Audio? OT rant., Len Ovens, (Thu Dec 27, 3:10 pm)
Re: [LAU] Pro Audio? OT rant., Fons Adriaensen, (Thu Dec 27, 5:20 pm)
Re: [LAU] Pro Audio? OT rant., Len Ovens, (Thu Dec 27, 11:31 pm)
Re: [LAU] Pro Audio? OT rant., Ralf Mardorf, (Thu Dec 27, 5:25 pm)
Re: [LAU] Pro Audio? OT rant., Neil, (Thu Dec 27, 10:37 pm)
Re: [LAU] Pro Audio? OT rant., Fernando Lopez-Lezcano, (Mon Dec 31, 2:28 am)
Re: [LAU] Pro Audio? OT rant., Neil, (Mon Dec 31, 8:15 pm)
Re: [LAU] Pro Audio? OT rant., Charles Henry, (Mon Dec 31, 8:57 pm)
Re: [LAU] Pro Audio? OT rant., Monty Montgomery, (Wed Jan 2, 8:35 am)
Re: [LAU] Pro Audio? OT rant., Neil, (Mon Dec 31, 9:17 pm)
Re: [LAU] Pro Audio? OT rant., Charles Henry, (Mon Dec 31, 9:39 pm)
Re: [LAU] Pro Audio? OT rant., Tim E. Real, (Mon Dec 31, 10:44 pm)
Re: [LAU] Pro Audio? OT rant., Thomas Vecchione, (Tue Jan 1, 5:23 pm)
Re: [LAU] Pro Audio? OT rant., Al Thompson, (Tue Jan 1, 6:37 pm)
Re: [LAU] Pro Audio? OT rant., Gene Heskett, (Tue Jan 1, 7:20 pm)
Re: [LAU] Pro Audio? OT rant., Al Thompson, (Wed Jan 2, 12:26 am)
Re: [LAU] Pro Audio? OT rant., Tim E. Real, (Wed Jan 2, 8:14 am)
Re: [LAU] Pro Audio? OT rant., Al Thompson, (Wed Jan 2, 8:23 am)
Re: [LAU] Pro Audio? OT rant., Ralf Mardorf, (Tue Jan 8, 2:30 pm)
Re: [LAU] Pro Audio? OT rant., Folderol, (Mon Dec 31, 10:02 pm)
Re: [LAU] Pro Audio? OT rant., Monty Montgomery, (Wed Jan 2, 8:43 am)
Re: [LAU] Pro Audio? OT rant., Thomas Vecchione, (Fri Dec 28, 2:38 am)
Re: [LAU] Pro Audio? OT rant., Monty Montgomery, (Thu Dec 27, 11:22 pm)
Re: [LAU] Pro Audio? OT rant., Neil, (Fri Dec 28, 4:41 am)
Re: [LAU] Pro Audio? OT rant., Monty Montgomery, (Thu Dec 27, 11:24 pm)
Re: [LAU] Pro Audio? OT rant., Len Ovens, (Thu Dec 27, 11:14 pm)
Re: [LAU] Pro Audio? OT rant., Neil, (Thu Dec 27, 11:23 pm)
Re: [LAU] Pro Audio? OT rant., Len Ovens, (Thu Dec 27, 11:47 pm)
Re: [LAU] Pro Audio? OT rant., Gene Heskett, (Fri Dec 28, 12:22 am)
Re: [LAU] Pro Audio? OT rant., Ralf Mardorf, (Fri Dec 28, 5:30 am)
Re: [LAU] Pro Audio? OT rant., Fons Adriaensen, (Fri Dec 28, 12:18 am)
Re: [LAU] Pro Audio? OT rant., Len Ovens, (Sat Dec 29, 2:38 am)
Re: [LAU] Pro Audio? OT rant., Fons Adriaensen, (Sat Dec 29, 11:13 am)
Re: [LAU] Pro Audio? OT rant., Thomas Vecchione, (Sat Dec 29, 2:48 pm)
Re: [LAU] Pro Audio? OT rant., Fons Adriaensen, (Sat Dec 29, 7:54 pm)
Re: [LAU] Pro Audio? OT rant., Al Thompson, (Sun Dec 30, 4:19 pm)
Re: [LAU] Pro Audio? OT rant., Fons Adriaensen, (Sun Dec 30, 4:53 pm)
Re: [LAU] Pro Audio? OT rant., Len Ovens, (Sun Dec 30, 4:57 pm)
[LAU] Live mic and monitoring (was rant.), Len Ovens, (Sat Dec 29, 8:56 pm)
Re: [LAU] Live mic and monitoring (was rant.), Marius Janßen, (Sat Dec 29, 11:26 pm)
Re: [LAU] Live mic and monitoring (was rant.), Roger, (Sun Dec 30, 9:35 am)
Re: [LAU] Live mic and monitoring (was rant.), Thomas Vecchione, (Sun Dec 30, 10:48 am)
Re: [LAU] Live mic and monitoring (was rant.), Jörn Nettingsmeier, (Sat Dec 29, 11:23 pm)
Re: [LAU] Live mic and monitoring (was rant.), Thomas Vecchione, (Sun Dec 30, 10:43 am)
Re: [LAU] Pro Audio? OT rant., Thomas Vecchione, (Sat Dec 29, 2:55 am)
Re: [LAU] Pro Audio? OT rant., Bob van der Poel, (Sat Dec 29, 3:07 am)
Re: [LAU] Pro Audio? OT rant., Brett McCoy, (Thu Dec 27, 11:36 pm)
Re: [LAU] Pro Audio? OT rant., Fons Adriaensen, (Thu Dec 27, 11:07 pm)
Re: [LAU] Pro Audio? OT rant., Al Thompson, (Wed Dec 26, 5:51 am)
Re: [LAU] Pro Audio? OT rant., Thomas Vecchione, (Mon Dec 24, 7:17 am)
Re: [LAU] Pro Audio? OT rant., Brent Busby, (Mon Dec 24, 4:38 pm)
Re: [LAU] Pro Audio? OT rant., Ralf Mardorf, (Thu Dec 27, 1:57 pm)
Re: [LAU] Pro Audio? OT rant., Jeremy Jongepier, (Tue Dec 25, 1:33 pm)
Re: [LAU] Pro Audio? OT rant., Ralf Mardorf, (Thu Dec 27, 2:27 pm)
Re: [LAU] Pro Audio? OT rant., Monty Montgomery, (Tue Dec 25, 2:11 am)
Re: [LAU] Pro Audio? OT rant., Thomas Vecchione, (Mon Dec 24, 5:08 pm)
Re: [LAU] Pro Audio? OT rant., Fons Adriaensen, (Mon Dec 24, 2:27 pm)
Re: [LAU] Pro Audio? OT rant., SxDx, (Mon Dec 24, 3:25 pm)
Re: [LAU] Pro Audio? OT rant., Ralf Mardorf, (Thu Dec 27, 1:27 pm)
Re: [LAU] Pro Audio? OT rant., Fons Adriaensen, (Mon Dec 24, 3:40 pm)
Re: [LAU] Pro Audio? OT rant., Ricardus Vincente, (Mon Dec 24, 4:33 pm)
Re: [LAU] Pro Audio? OT rant., Paul Davis, (Mon Dec 24, 3:46 pm)
Re: [LAU] Pro Audio? OT rant., Fons Adriaensen, (Mon Dec 24, 4:37 pm)
Re: [LAU] Pro Audio? OT rant., Thomas Vecchione, (Mon Dec 24, 5:05 pm)
Re: [LAU] Pro Audio? OT rant., Fons Adriaensen, (Mon Dec 24, 4:01 pm)
Re: [LAU] Pro Audio? OT rant., Thomas Vecchione, (Mon Dec 24, 3:01 pm)
Re: [LAU] Pro Audio? OT rant., Paul Davis, (Mon Dec 24, 2:48 pm)
Re: [LAU] Pro Audio? OT rant., Ralf Mardorf, (Thu Dec 27, 1:10 pm)
Re: [LAU] Pro Audio? OT rant., Thomas Vecchione, (Mon Dec 24, 3:05 pm)
Re: [LAU] Pro Audio? OT rant., SxDx, (Mon Dec 24, 8:58 am)
Re: [LAU] Pro Audio? OT rant., Monty Montgomery, (Mon Dec 24, 3:14 am)
Re: [LAU] Pro Audio? OT rant., Ricardus Vincente, (Mon Dec 24, 3:23 am)
Re: [LAU] Pro Audio? OT rant., Fons Adriaensen, (Sun Dec 23, 10:45 am)
Re: [LAU] Pro Audio? OT rant., Thomas Vecchione, (Sun Dec 23, 5:30 pm)
Re: [LAU] Pro Audio? OT rant., Fons Adriaensen, (Sun Dec 23, 9:35 pm)
Re: [LAU] Pro Audio? OT rant., Thomas Vecchione, (Sun Dec 23, 10:05 pm)
Re: [LAU] Pro Audio? OT rant., Fons Adriaensen, (Sun Dec 23, 10:17 pm)
Re: [LAU] Pro Audio? OT rant., Monty Montgomery, (Sun Dec 23, 10:32 pm)
Re: [LAU] Pro Audio? OT rant., Monty Montgomery, (Sun Dec 23, 10:17 pm)
Re: [LAU] Pro Audio? OT rant., Joe Hartley, (Sun Dec 23, 6:07 pm)
Re: [LAU] Pro Audio? OT rant., Fons Adriaensen, (Sun Dec 23, 9:01 pm)
Re: [LAU] Pro Audio? OT rant., Gene Heskett, (Sun Dec 23, 7:48 pm)
Re: [LAU] Pro Audio? OT rant., Fons Adriaensen, (Sun Dec 23, 10:05 pm)
Re: [LAU] Pro Audio? OT rant., Chris Bannister, (Mon Dec 24, 3:20 am)
Re: [LAU] Pro Audio? OT rant., Fons Adriaensen, (Mon Dec 24, 1:55 pm)
Re: [LAU] Pro Audio? OT rant., Ralf Mardorf, (Thu Dec 27, 12:53 pm)
Re: [LAU] Pro Audio? OT rant., Gene Heskett, (Thu Dec 27, 1:05 pm)
Re: [LAU] Pro Audio? OT rant., Ralf Mardorf, (Thu Dec 27, 3:17 pm)
Re: [LAU] Pro Audio? OT rant., Gene Heskett, (Mon Dec 24, 4:13 pm)
Re: [LAU] Pro Audio? OT rant., Monty Montgomery, (Mon Dec 24, 3:47 am)
Re: [LAU] Pro Audio? OT rant., Monty Montgomery, (Mon Dec 24, 3:49 am)
Re: [LAU] Pro Audio? OT rant., Monty Montgomery, (Sun Dec 23, 10:01 pm)
Re: [LAU] Pro Audio? OT rant., Paul Davis, (Sat Dec 22, 9:53 pm)
Re: [LAU] Pro Audio? OT rant., Ralf Mardorf, (Sat Dec 22, 10:05 pm)
Re: [LAU] Pro Audio? OT rant., Ralf Mardorf, (Sat Dec 22, 7:10 pm)