[opendtv] Re: TV Technology: Sinclair's Mr. Smith Goes to Washington
- From: "Manfredi, Albert E" <albert.e.manfredi@xxxxxxxxxx>
- To: "opendtv@xxxxxxxxxxxxx" <opendtv@xxxxxxxxxxxxx>
- Date: Sun, 6 Nov 2016 17:00:43 +0000
Craig Birkmaier wrote:
There have been numerous demonstrations of Interactive TV in one
way broadcast channels. You simply send the interactive elements
as metadata and let the receiver manage the interactions with the
You are not describing anything more than what people have been able to do for
the past many decades with a recording device, like a VCR. This is pure
propaganda, twisting the meaning of words to try to fool the innocent. The only
"interactivity" you are providing is "interactivity" with content of the TV
station's choosing. Something I've been doing for 30 years, Craig. No thank to
Yes, I can record an episode of NCIS, even over analog TV, and then I can play
it back, FF over ads, rewind if I want to, and so on. And I can adjust the
volume control! This is all you have described. Once people understand this
much, they won't buy this "interactive over the public airwaves" stuff.
There's nothing new here. You can do this with the data broadcast
This is why I chose my words carefully, Craig. I said "in practice." In theory,
you can create a downlink over the OTA channel, and then a separate uplink (aka
"backchannel") over, say, a telephone line. You can use A90 to encapsulate the
downlink packets and address them to just one TV set in the market.
Now do the numbers. Let's say 10,000 people in a TV market want to "interact"
with that TV station. Let's say the TV station dedicates 3 Mb/s to this
interactive service. How much capacity will each household get? Okay, let's be
absurd. Say the TV dedicates all 19.3 Mb/s to "interactive." Now how much
channel capacity will each household get? And that's just a mere 10,000
customers. Why not just use a slow dialup Internet connection?
With the numbers you have just calculated above, explain how would you support
on demand TV with the public airwaves ATSC 3.0 channel?
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