[ale] Digital TV...

[rsj at radio.org]

--- On Sun, 12 May 1996 17:47:09 -0400 (EDT)  Unix Guru Dude <geof at denali.is.net> wrote:

># STUFF DELETED
>}>
>}>That doesn't make a lot of sense to me.  How do you send a digital signal
>}>over an analog line?  If it is truly then converted to analog on the fly,
>}>what have you gained?  I don't get it, sounds like a lot of sales talk to me.
>}>It's like saying you get cd quality from an analog tape when you copy a cd
>}>to tape...  I'd like to understand how this is done and why, if this works,
>}>other companies are going to the pains of creating a digital TV.
>}
>}I believe that you are missing the point.  You need to separate the format 
>}of the data from the transport medium.  Only the CD is digital-digital all 
>}the rest are analog-digital.  There isn't any difference in using a DAT or 
>}other tape to hold the data (whether digitized/digital video or audio or 
>}data) and your hard/floppy disk.  They all just write 0/1's to the media 
>}instead of varying analog levels to the tape/disk. 
>}
>}When digital information goes over cable/air(satellite) it is still digital 
>}information (0/1's)  The reason that you get a much better picture and audio 
>}when using digital is that poor signal strength does not cause loss of the actual 
>}data when it is digital as opposed to analog which gets noisy.  Most digital 
>}systems just look for the zero crossing of the signal at the proper clock time 
>}and decide whether it is a 0 or a 1.
>}
>}The only digital-analog conversion that he indicated was at the converter in 
>}the home which would convert the signal to analog for the standard (by today's
>}standards) television set.  This is much the same as the current crop of DSS 
>}satellite systems do.
>}
>}One thought just came to me, what is the difference between sending digital data
>}over the cablevision coax and over ethernet coax?
>
>This all makes more sense now.  So the key is not so much the format as the
>fact that the analog loses quality over distance vs. digital.   This I do
>understand, but is cablevision digital?  I thought it was analog.  If it is
>analog, then regardless of what you do with the signal, it will still lose
>quality as the analog is passed across the cablevision line..
>

The current cabelvision is analog but what was discussed at the earlier part of 
this thread was to transmit digital data over the cable to your settop which will
convert it back to an analog signal for your television.  This will eliminate
the signal loss and distortions over the cable itself.


>}
>}>
>}>} 
>}>}It's really sweet.
>}>}>
>}>}-----------------------------------------------------------------------
>}>}
>}>}Robert L. Harris
>}>}FSN System Administrator, Time Warner Cable.
>}>}e-mail: Robert.Harris at twcable.com 
>}>}        nomad at netwide.net
>}>}
>}>}###################################################
>}>}# Un*x FOREVER         # These are my thoughts    #
>}>}#                      #  and only my thoughts.   #
>}>}# Never Play LeapFrog  #  Any resembleance to     #
>}>}#  With a Unicorn!     #  anyone else's thoughts  #
>}>}#                      #  is either coincidence,  #
>}>}#                      #  or they stole them      #
>}>}#                      #  from me.                #
>}>}###################################################
>}>}
>}>}
>}>
>}>
>}>-- 
>}>Until later:
>}>Geoffrey Myers   geof at denali.is.net   Unix.Guru.Dude at worldnet.att.net
>}>	http://www.ticllc.net/~geof  or http://denali.is.net/~geof
>}>
>}>	Opinions expressed by me are mine, all mine, only mine.....
>}>
>}
>}-----------------End of Original Message-----------------
>}
>}
>}Randy
>}
>}---
>}Randy Jarrett  WA4MEI      | MAIL:
>}EMAIL rsj at mail.radio.org   | 54 Patterson Road SW
>}PHONE (770)822-1096        | Lawrenceville, GA  30244-4620
>}
>}
>
>
>-- 
>Until later:
>Geoffrey Myers   geof at denali.is.net   Unix.Guru.Dude at worldnet.att.net
>	http://www.ticllc.net/~geof  or http://denali.is.net/~geof
>
>	Opinions expressed by me are mine, all mine, only mine.....
>

-----------------End of Original Message-----------------


Randy

---
Randy Jarrett  WA4MEI      | MAIL:
EMAIL rsj at mail.radio.org   | 54 Patterson Road SW
PHONE (770)822-1096        | Lawrenceville, GA  30244-4620