[sdiy] (Speaking of...)CCD as BBD????

[VINTVOLT]

Hi!
I've been into camera technology recently and got quite involved in CCD 
devices and their operation theory. Esentialy they are like a BBD but 
laid out in a square matrix. Also, the input signal (light) not only 
enters the first 'bucket' as it would happen on a BBD but incides on 
all photosensors at once. With a set of commonly 6 clock signals 
Charges are transfered horizontally and vertically to a buffer line 
from where the charges are read out individually to form the continuous 
video signal.

Well, after this short intro, let me tell you my weird idea: Recycle a 
CCD to use it as a BBD! 
<insert mad scientist laugh here >

First, the audio signal should be transformed properly to light using a 
linerized diode or something. The bipolar audio signal should be offset 
so that 'barely no light' is in fact a negative audio voltage? 

Then, this light should be applied to one single cell of the CCD. How? 
I don't know, maybe a mask with a tiny hole? Depending on what cell you 
are driving, you shold get different delay times (?)

The transfer pulses should be slowed down as to get usable delay times 
for audio...

Theorically it is a good idea (IMHO) but could it be feasible?
Imagine a BBD with 1 Millon buckets :) 

Now anyone got a spare camera and a screwdriver?

--
Carles Vila 
Departament d'Acústica
Enginyeria la Salle
Barcelona, Spain
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