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

[Jim Johnson]

Interesting idea! Taking it a bit further.. rather than trying to use it as
a straight delay.. what about simply running the audio through an LED -
maybe even a bi-color LED - and letting the CCD process that in the usual
way - that is, through all cells? I'm not sure what the sonic results would
be, but it would be a combination of multiple delays and some sort of
transmogrification - either linear or non. What a unique effect this would
be!

Of course, I know nothing about CCDs, so this may not work at all...

Jim Johnson 
Metaphoric Software
-------------------
Makers of Techno Toys
Software for Electronic Music
http://www.technotoys.com
info at technotoys.com


*********** REPLY SEPARATOR  ***********

On 2/9/01 at 7:33 PM VINTVOLT wrote:

>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
>-------------------------------------------------------------
>
> ___________________________________________________________________ 
>Consigue tu e-mail gratuito TERRA.ES
> Haz clic en http://www.terra.es/correo/

-