Bob Washburne wrote:
> Stephen Williams wrote:
> > Imagine if hearing could be similarly tricked using only three pitches:-)
> I think it already has been.
> There was a game (Barbie ?) for the old Commodoore 64 in which Ken calls
> Barbie up for a date and she has to go shopping for a new outfit.
> Anyway, Ken and Barbie both had nice digitised voices. Beachhead II
> also had good voice digitization.
> But the only sound available for the C64 was a simple synthesizer which
> produced square, triangle, sawtooth and noise. These were combined very
> nicely (the audio equivilent of RGB) to reproduce recorded speach.
> That what you mean?
> Bob Washburne
That was done using PWM, a time-domain technique.
You can't do it in frequency domain, because the ear is a several 1000
channel analyzer versus 3 channels of the eye. (Yes, it's 3 - the
luminance sensors (the 'rods') have the same sensitivity as the 'green'
Back to scanning - if you need to get all the info that is in a
photograph ABOUT THE ORIGINAL SCENE, a three channel scanner is enough,
because the original photo process has already reduced it to 3 chans.
By using a multispectral scanner, you'll only get more info about the
spectral shapes of the pigments (dyes) that make up the photo.
But I suspect that those 19th century photos are single-channel anyway?
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