[QuadList] VR-1200B in operation

[Tony Quinn]

In message 
<A99B66AF-E040-4A72-A722-744789056CE2 at quadvideotapegroup.com>, Ted 
Langdell <ted at quadvideotapegroup.com> writes
>Hi, Park,
>
>On Dec 2, 2008, at 8:20 AM, C. Park Seward wrote:
>
>  The TV sitcom looks especially good as a direct recording from the
>  network line.
>
>Sounds like fun! Enjoyed the video.
>
>Do you know when and at what point along the CBS network the Green
>Acres recording was made?
>
>Wondering how the sound sounds... since in the early days of network
>television had sound carried by conventional copper, like radio network
>sound and picture was carried by coax and microwave relay.
>
>Not sure when AT&T piggybacked the sound with the picture—called
>"multiplexing" as I recall—but David Crosthwait has mentioned the
>relatively inferior quality of recordings made "off the line"  at West
>Coast points (including network delay centers in LA and Burbank)
>because of the limited frequency response of the separate audio lines.
>
>The telco folks also had to work out some sound/picture sync issues
>because the sound and picture had different propagation characteristics
>due to the technology used for each.
>
>After they learned to multiplex the audio with video and delivered it
>on—want to say 110ohm balanced copper—things got better in terms of
>frequency response, and audio-video out of sync issues.
>
>I googled a while to find some links to the multiplexing process, but
>didn't come up with anything.  As I recall, the video went as baseband,
>and the audio was on a carrier above the video.

Which is why the BBC developed this

http://en.wikipedia.org/wiki/Sound-in-Syncs
-- 
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