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16th August 2012, 08:51 PM  #26461 
diyAudio Member

Please! I'm not Ed's doppleganger.
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"The question of who is right and who is wrong has seemed to me always too small to be worth a moment's thought, while the question of what is right and what is wrong has seemed allimportant." 
16th August 2012, 08:55 PM  #26462  
diyAudio Member
Join Date: Jan 2004
Location: away

Quote:
We are not talking about those issues. I suspect that getting the records out of sync by 10 usec would be really difficult![/quote] No, it is not difficult. The comb filtering was so good that when I inverted one program, total and absolute cancellation of ALL program occurred..A stereo with 3 kilowatts running to clipping going absolutely silent. Remember toto, we're not talking digital here so we ain't in Kansas....nuttin but analog back in the day. jn ps..I did try slowing down my 10 inch reel to reel by dragging the flange back in '79. Broke the tape..so started buying two copies of the hot songs, for phasing/flanging and echo. Last edited by jneutron; 16th August 2012 at 08:58 PM. 

16th August 2012, 08:58 PM  #26463  
diyAudio Member

Quote:
This statement on it's its own has little or no relevance. Please address a particular technique or analysis whose results you find invalid due to the above "fact". The implication that Fourier techniques have no use with noise and music is as your friend said "silly". A finite time sample bounds our knowledge of the stimulus. A priori you have no way of knowing that your input is NOT periodic. The pointless dissing of useful tools is tiresome.
__________________
"The question of who is right and who is wrong has seemed to me always too small to be worth a moment's thought, while the question of what is right and what is wrong has seemed allimportant." 

16th August 2012, 09:02 PM  #26464 
diyAudio Member

I did this effect with Roland flanger pedal, inserting it in a left master channel of mixing console. It was used as delay only, no mixing, no feedback, with floating delay time. I was switching it on during solo of the drummer. There were no flanger effects, just people rotated heads all around. Some even heard vertical image movements!
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16th August 2012, 09:08 PM  #26465  
diyAudio Member
Join Date: May 2007

Quote:
Noise and music if unrepeated are nonperiodic so cannot be reduced to a Fourier series, but they can be handled by a Fourier transform which is the continuous (in frequency) development of the Fourier series (which is discrete in frequency). By repeating the noise/music they become periodic so can be handled by a Fourier series. The continuous Fourier transform splits into closelyspaced Fourier series components. Unless your circuits behave differently when music is repeated rather than played just once then the results of one analysis can be carried over into the other. So you misunderstood, and so presumably misrepresented, what we are saying. You also stated your false idea about CR circuits, which if your friend agreed with would be a sign that he doesn't understand either. 

16th August 2012, 09:39 PM  #26466  
diyAudio Member
Join Date: Nov 2008
Location: Oakmont PA

Quote:
You certainly can put any signal in a Fourier based analyzer. You will get information to the limits of your technique. Now one can certainly take the Fourier coefficients of sign wave or series of them and with very little information do an accurate reproduction. But if you wiggle the level control you have a nonperiodic signal that is not so simply reduced. Now how would you capture the wiggle? 

16th August 2012, 09:41 PM  #26467 
diyAudio Member
Join Date: May 2007

I sense wriggling, rather than wiggling.

16th August 2012, 09:46 PM  #26468 
diyAudio Member
Join Date: Nov 2008
Location: Oakmont PA

DF
When you subtract the level matched input from the output what is left is distortion. For those who don't consider differences in wave shape you can just use the magnitude of the Fourier transform. I thought you had posted before that noise and music are periodic! 
16th August 2012, 09:48 PM  #26469 
diyAudio Member
Join Date: Nov 2008
Location: Oakmont PA


16th August 2012, 09:49 PM  #26470  
diyAudio Moderator

Quote:
There's a few hundred thousand FT spectrometers out there which work perfectly in defiance of your misunderstanding.
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