RE: TI-H: hey (cont.)
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RE: TI-H: hey (cont.)
I could only see two ways to distinguish colors...
One:
Measure the frequencies of the light waves. Remember, different colors
produce different frequencies. This is highly improbable and I doubt
mankind will ever be able to do it.
Two:
Use some sort of prism that directs different color light to different
phototransistors.
But as Olle said before, producing the light is expensive and bulky.
Brenden McNeil
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> -----Original Message-----
> From: owner-ti-hardware@lists.ticalc.org
> [mailto:owner-ti-hardware@lists.ticalc.org]On Behalf Of Olle Hedman
> Sent: Wednesday, January 26, 2000 6:26 PM
> To: ti-hardware@lists.ticalc.org
> Subject: Re: TI-H: hey (cont.)
>
>
>
> Sassamo16@aol.com wrote:
> > i also had a similar idea with different colors, although
> slightly different
> > instead of red=1, blue=2, green=3, etc., it would be
> > red=0, blue=1, green=10, orange=11, etc.
> > the would only be helpful in data transfer though, not data storage
>
> different colors is behaveing differently in the same medium. The
> reson they
> have choosen the color they have is that that color is tranfered
> with the least
> loss at an affordable price of the light generator.
> To have differnt colors in the same fibre would raise a lot of
> problems. one is
> the transmitting device. blue is very hard and expensive to make
> for example.
> another one is the resciver. As for now, you only have to detect
> light or no
> light. That is MUCH easier than detect different colors.
> something close to your idea is actually used in modern modems, that send
> several bits per baud, by modulateing both phase and amplitude.
> as for today, your technique would be far to expensive and bulky.
> apart from the
> problem with different signal loss of the different colors.
> maybe in the future.
>
>
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