Hello,

Instead of using a binary system a tertiary system could be used for
Skybuck's Universal Code.

For example:

-5 voltage would mean 0

0 voltage would mean 1

5 voltage would mean 2

The data is still in binairy. (0,1)

However a marker can now be added to the information stream, indicating the
end of the field.

For example:

 0111011011011011210011010100112011011011
0112112010101012

So this would make the encoding more efficient and still flexible.

Bye,
Skybuck.

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"Skybuck Flying" <spam@hotmail.com> wrote in message
news:448537ba$0$722$5fc3050@dreader2.news.tiscali.nl...
> For example:
> -5 voltage would mean 0
> 0 voltage would mean 1
> 5 voltage would mean 2
>
> However a marker can now be added to the information stream, indicating th
e
> end of the field.
>
> So this would make the encoding more efficient and still flexible.

In particular systems, yes, this could be efficient and flexible (and it's n
ot
altogether unlike the sync pulses used in NTSC and PAL video).  Strictly fro
m
the communications theory point of view, though, you've just added 58.5%
overhead to your channel (3 states is 1.585 bits) to signal what I'm going t
o
assume is (statistically) a relatively uncommon event (framing); there are
more efficient schemes available, even something as simple as a 9th bit per
byte (12.5% overhead).

You do see a lot of ICs that use this sort of tertiary encoding for, e.g.,
configuration bins: Low means one thing, open means another, and high means 
a
third.  Internally they're presumably using (roughly) 0v, 2.5V (bias), and 5
v.

---Joel

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Skybuck Flying skrev:

> Hello,
>
> Instead of using a binary system a tertiary system could be used for
> Skybuck's Universal Code.
>
> For example:
>
> -5 voltage would mean 0
>
> 0 voltage would mean 1
>
> 5 voltage would mean 2
>
> The data is still in binairy. (0,1)
>
> However a marker can now be added to the information stream, indicating th
e
> end of the field.
>
> For example:
>
>  0111011011011011210011010100112011011011
0112112010101012
>
> So this would make the encoding more efficient and still flexible.
>
> Bye,
>   Skybuck.


USB kinda does that, data is normally differential but "single ended
zero" i.e. both data lines low are used for EOP and RESET signalling

-Lasse

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