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TV spectrum

G

GregS

Jan 1, 1970
0
You find all the info in the spectrum of the analog TV broadcast.
Where is the description of the transmitted digital signal,
and I would like to see a spectrum of the output. ??

greg
 
G

GregS

Jan 1, 1970
0
"GregS"


Fo the system used in the USA see:

http://en.wikipedia.org/wiki/8VSB




** AFAIK it looks very much like noise.




..... Phil


I see that on the other posters response link.
I was listening on my detector last week and didn't pic up anything
audible. Will check it again with a simple spectrum analyzer later.
With analog, I heard the video as it was being detected with the input of a simple
op-amp amplifier. Basically sounding like when you plugged the video
into an audio input by mistake.

Interference, mostly in the audible band has been the main cause
for concern from a nearby tower about 500 feet away, with the old analog. They just started
broadcasting digital last week and I am checking for common noise
problems detected with sensitive lab equipment.
Construction in new buildings specified aluminum backed drywall because
of this tower.


greg
 
P

Paul Keinanen

Jan 1, 1970
0
Eighteen formats. Insanity cubed!

Once you have to support more than one format _or_ have to support a
different display rate (say SD) than broadcast rate, you are going to
have to use some standard conversion anyway. Adding two or twenty
format is then no longer an issue.

Paul
 
P

Phil Allison

Jan 1, 1970
0
"Mark"

RFI from analog video sounded like a buzz as you described.

RFI from 8VSB will sound like a hiss.

** Not in audio gear it won't.

There is a lot less energy in the audio range with 8VSB so RFI from TV
into audio gear should be less prevelent but since it no longer
creates that distinvtive buzz, it will be harder to identifiy.


** It simply will not be rectified to an audible frequency.


..... Phil
 
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