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Question about sound on old ( analog ) tvs



 
 
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  #1  
Old September 8th 08, 07:22 PM posted to alt.tv.tech.hdtv
S D
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Posts: 5
Default Question about sound on old ( analog ) tvs

I've noticed that sound from audio tape or an LP can appear in a reduced
form prior to the actual reproduction from a stereo receiver, I guess
that this comes from the pre amp, but can anything like this happen in
an analog TV when it gets transmissions from cable or satellite ? I mean
is there what would amount to an instantaneous transmission of picture
and sound to the viewer when the set gets the signal or can the set
delay the transmission for a half second or so ? SD

  #2  
Old September 8th 08, 08:34 PM posted to alt.tv.tech.hdtv
G-squared
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Posts: 1,487
Default Question about sound on old ( analog ) tvs

S D wrote:
I've noticed that sound from audio tape or an LP can appear in a

reduced
form prior to the actual reproduction from a stereo receiver, I

guess
that this comes from the pre amp, but can anything like this happen

in
an analog TV when it gets transmissions from cable or satellite ? I

mean
is there what would amount to an instantaneous transmission of

picture
and sound to the viewer when the set gets the signal or can the set
delay the transmission for a half second or so ? SD


Analog sets have little (maybe 1 or 2 _lines_ of time) to no delay in
the processing. The 'pre' audio you might hear on analog audio comes
from 'print through' of 1 layer of tape 'recording' the adjacent
layer. The same maggnetic transfer _can_ happen in digital BUT you'll
never hear it because it isn't strong enough to damage the bits you
you want and IF they do, the error correction can still fix it.

HOWEVER, very little analog tape is still aired directly. Most
everything has had at least 1 generation of digital. One of the tasks
we do where I work is copy analog 1/2", 1" and 2" tapes to digital
formats - usually digital BetaCam.

G
  #3  
Old September 8th 08, 09:48 PM posted to alt.tv.tech.hdtv
Jim Wilkins
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Posts: 145
Default Question about sound on old ( analog ) tvs

On Sep 8, 2:22*pm, (S D) wrote:
I've noticed that sound from audio tape or an LP can appear in a reduced
form prior to the actual reproduction from a stereo receiver, I guess
that this comes from the pre amp, but can anything like this happen in
an analog TV when it gets transmissions from cable or satellite ? I mean
is there what would amount to an instantaneous transmission of picture
and sound to the viewer when the set gets the signal or can the set
delay the transmission for a half second or so ? SD


The waves in a record groove slightly affect the needle as it passes
in the adjacent groove.
 




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