Re: Four Logic Levels
- From: "Bob Eld" <nsmontassoc@xxxxxxxxx>
- Date: Wed, 30 Apr 2008 08:18:43 -0700
"Robotnik" <fathahrahman@xxxxxxxxx> wrote in message
news:5848b1ff-dc0a-4b22-a70b-d1a9749014f1@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Hey guys,
I was thinking of a new concept whereby we could
square the amount of information stored in a bit. Currently, the
information stored in a bit is whether the bit is on or off. To put it
simply, the information has a base (remember, logarithmic base) of 2.
If we could develop a mechanism whereby the base can be increased to 3
or 4, the amount of information stored can increased to more than
1.584 times in the case where the base is increased to two or 2
(twice ) if the base is increased to 4.
This can be accomplished by sensitizing 3(4 if
possible) voltage levels instead of the two currently. Your comments
are invited.
They have this with a thousand or more levels, it's called ANALOG!
Actually, digital transmission schemes like QAM, PAM, etc. use a number of
levels and phase of a carrier to form an information symbol. Each symbol
corresponds to a digital bit pattern.
For example, in 16-QAM there are four levels and four phases of the carrier.
At any given instant in time the level and phase corresponds to one of the
16 possible positions of amplitude and phase. This pattern is called a
constellation. Each of the 16 positions forms a symbol of a four bit
pattern. (four bits has 16 values) Therefore four bits at a time are carried
at every instant.
Note that bits are not carried or transmitted. Amplitude and phase of a sine
wave is carried. This is just an example many schemes are possible some
carrying 8 or more bits per symbol. Eight bits requires a 256 position
constellation of phase and amplitude.
.
- References:
- Four Logic Levels
- From: Robotnik
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