Re: [ARSCLIST] Slides and inconvenient media (was spin it again)

[Eric Jacobs <EricJ@xxxxxxxxxxxxxxxxxxx>]

While on the topic of images, I'd like to just toss in some
image processing trivia...

If you take the FFT of a (single) image (I know the thread was
on the subject of stereo images) and throw away all the amplitude
information in the FFT, you can still reconstruct the entire 
image at full resolution from just the phase information.  There 
will be a constant offset (ie. brightness, for example), but 
otherwise you have the complete image.  I think I have this 
right...

I'm wondering - and I have no real basis to believe that this
bit of image processing trivia has any relationship to audio - if 
it would be possible to reconstruct the original stereo signal 
from just the phase information.  And if this were possible,
we might even build DSP tools to assess the quality/accuracy
of a measured stereo audio "image".  If there was any debate
if a system were creating a proper stereo audio image, such 
tools could reverse a stereo signal and then compare the 
phase-generated stereo signal to the source...

Hah.  Easier to use your ears for sure!  

OK - enough blue sky out-of-the-box craziness for a Friday 
night...

Eric Jacobs

The Audio Archive
tel: 408.221.2128
fax: 408.549.9867
mailto:EricJ@xxxxxxxxxxxxxxxxxxx