You could use a vinyl LP and record a digital signal on it or an analog
signal. A record player runs a needle in the groove and picks up that
analog vibrations. However, a person could record just one tone and
silence instead of the full range of audible frequencies. (It would
probably use two tones and one would be the "Marking" tone and the other
the "Spacing" tone)
The pattern of that tone being on of off can represent the full audio
spectrum using PCM (pulse Code Modulation) or it can represent written
text as used in RTTY. (Radio Teletype) Or it can represent the
information that your computer is sending over it's modem. That
connection to your analog telephone line is digital. Even though the
telephone line only recognizes analog signals the MODEM modulates the
digital signal, converting it to analog for transmission, on the other
end the modem demodulates the signal and converts it back to digital and
uses error correction to make sure what it reconstructs is exactly the
same as what was sent. That way when I type this, you read what I
wrote, and not some gibberish.
"James S. Lee" wrote:
>It only becomes analog again when it is converted. The underlying
> substrate in CDs is not "ultimately analog." Am I missing something in the
> traditional definitions of analog and digital?
>
Rat was playing word games and sort of made a mistake.
--
Jim Coon
Not just another pretty mandolin picker.
mailto:[EMAIL PROTECTED]
If Gibson made cars, would they sound so sweet?
My first web page
http://www.tir.com/~liteways
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