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<DIV><FONT size=4>AT&T decided on using sub carriers of 6.2 and 6.8MHz
</FONT></DIV>
<DIV><FONT size=4>for Left and Right audio for the improved terrestial
</FONT></DIV>
<DIV><FONT size=4>network.</FONT></DIV>
<DIV><FONT size=4></FONT> </DIV>
<DIV><FONT size=4>I remember comparing the OLD v.s. the NEW
audio.</FONT></DIV>
<DIV><FONT size=4>Better noise floor... Better S/N... Better
everything...</FONT></DIV>
<DIV> </DIV>
<DIV><FONT size=4>When the Big 3 went to satellite distribution, ABC and
</FONT></DIV>
<DIV><FONT size=4>CBS on C-Band, </FONT><FONT size=4>NBC being the first
major player to go the</FONT></DIV>
<DIV><FONT size=4>Ku-Band route, the 6.2 and 6.8MHz</FONT> <FONT size=4>sub carriers </FONT><FONT size=4>went along with them.</FONT></DIV>
<DIV> </DIV>
<DIV><FONT size=4>Analog video transmission would be the norm for
the</FONT></DIV>
<DIV><FONT size=4>Big 3 and cable channel distribution for many
years.</FONT></DIV>
<DIV> </DIV>
<DIV><FONT size=4>With the advent of Videocipher technology, the
analog</FONT></DIV>
<DIV><FONT size=4>cable feed transmissions were scrambled with the audio being
buried in the datastream along with the video. The</FONT></DIV>
<DIV><FONT size=4>"in the clear" 6.2 and 6.8 sub carriers became
"barkers"</FONT> </DIV>
<DIV><FONT size=4>for various </FONT><FONT size=4>products including
programming subscriptions!</FONT></DIV>
<DIV> </DIV>
<DIV><FONT size=4>Fun Times!!</FONT></DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV><FONT size=4>Don Murray, W4WJ</FONT></DIV>
<DIV><FONT size=4>Retired from 40 years of Miami TV Engineering</FONT></DIV>
<DIV><FONT size=4>35+ years at NBC O&O WTVJ</FONT></DIV>
<DIV> </DIV>
<DIV><FONT size=4></FONT> </DIV>
<DIV>
<DIV>In a message dated 3/24/2011 4:01:12 P.M. Central Daylight Time,
DennyD1@verizon.net writes:</DIV>
<BLOCKQUOTE style="BORDER-LEFT: blue 2px solid; PADDING-LEFT: 5px; MARGIN-LEFT: 5px"><FONT style="BACKGROUND-COLOR: transparent" color=#000000 size=2 face=Arial><BR>> On Mar 24,
2011, at 11:57 AM, sgw1009 wrote:<BR>><BR>>> In 1959, AT&T did
not have the capability of transmitting full <BR>>> bandwidth
(20KHz) audio across the country. Their audio bandwidth
<BR>>> was limited to only 5KHz, and in fact would a separate path
from <BR>>> the video. So the recording had to be made at the
studio in <BR>>> Burbank, and not New York, judging by the high
audio quality.<BR>><BR>>
I add:<BR>><BR>> This audio system was in place
until 1977!<BR>> BTW, the 5KHz audio was pretty
good. Though band-limited, <BR>> there was not a lot of
noise present. True, it wasn't high <BR>> fidelity as we
know it, but you'd be surprised at how good it <BR>>
sounded. I'm pretty certain now that, based on what I know,
the <BR>> recording was made in New York or somewhere along the
network line.<BR><BR> On Mar 24, 2011, at 12:46 PM,
Tony Quinn wrote:<BR><BR>> I'm not familiar with your US network
distribution system, but it's <BR>obvious that with the *RIGHT* male
voice a well equalised 5 kc/s <BR>circuit (and the right people) could
produce a very acceptable outcome.<BR>> I may be an engineer, but I don't
always need metering to tell me <BR>good from bad!<BR><BR>
I expand:<BR><BR> Tony, in the US, television
networks used the national telephone <BR>company AT&T almost
exclusively to distribute their programming into <BR>the early 1980's
when satellite distribution was introduced. Until <BR>1977, the
old 'Telco' distribution system maintained audio and video <BR>as
separate parallel feeds. This required constant monitoring along
<BR>the various paths to ensure that audio and video remained in sync
with <BR>each other. In 1977, AT&T improved the video service
so that it was <BR>capable of carrying a wider bandwidth than
before. Wider bandwidth <BR>systems allowed for audio subcarriers
to be transmitted along with the <BR>video, thereby providing for the
first time a single system for both <BR>video and audio. This
advance provided several new improvements in <BR>addition to its simple
'one line' concept: Audio quality was <BR>dramatically improved to
high-fidelity levels. 25-15KHz bandwidth <BR>became possible as
well as stereo transmission, both of which were not <BR>available to
network affiliates before. System noise levels were <BR>lowered as
well, and the elimination of the need to synchronize audio <BR>to video
was a tremendous advantage over the older separate system.<BR>
This new multiplex transmission system lasted only until satellite
<BR>distribution became common. NBC started satellite distribution of
its <BR>programming around 1982 using the Ku band, the only network at
the <BR>time go with Ku.<BR> Now of course, everything is
digital and high definition. Audio is <BR>so much better than what
was available just a few years ago, it's hard <BR>to imagine what it was
like back then.<BR><BR> Dennis Degan,
Video Editor-Consultant-Knowledge Bank<BR>
NBC Today Show, New
York<BR><BR><BR>_______________________________________________<BR>Please trim
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