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

[harry]

Sinse we are getting silly, I'll toss out one of my old ideas.  Think of the
Morley "oil-can" echo unit.  Take a can, and coat the inside with a reasonably
fast decaying phosphor.  Erase it by hitting it with a flood source (maybe UV
light ?) then after some decay, write to it with a modulated light source...
and
read it out with a phototransistor or photodiode ?

I got the idea from playing with my TV set and a blacklight (years ago)

Advantage... non contact echo unit. No wear.

H^) harry  (idea...no where!)

Jim Johnson wrote:

> 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
> >-------------------------------------------------------------
> >
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