[opendtv] Re: TV Technology: Sinclair's Mr. Smith Goes to Washington
- From: Craig Birkmaier <brewmastercraig@xxxxxxxxxx>
- To: opendtv@xxxxxxxxxxxxx
- Date: Mon, 07 Nov 2016 07:43:08 -0500
On Nov 6, 2016, at 12:00 PM, Manfredi, Albert E <albert.e.manfredi@xxxxxxxxxx>
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 ATSC 3.0.
You are clueless. This has nothing to do with recording of the video and audio
streams or time shifting.
Yes, any interactivity authored to accompany a TV program is of the stations,
or creators choosing. You could consider closed captioning a form of metadata
delivered information - this is supported in every TV by law, but it does not
qualify in my mind as interactivity. It is a simple on or off feature.
Demos of the techniques I am taking about have included the ability to display
information about the program and actors, the ability to "click" on someone on
the screen to bring up information, or to find out where to buy what they are
Adding the data is straight forward with A-90. But there is a bit of complexity
in creating both the hardware and software resident in the receiver to use the
Needless to say, today's connected TV devices have the hardware and processing
power to deliver this form of interactivity - but they use the Internet to
offer a superior 2-way communications path that enables greater capabilities
than an interactive experience that must be created in advance and embedded in
a program stream.
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
This clearly illustrates the problem with your thinking process in this case.
You DO NOT need a backchannel or uplink to support this form of interactivity.
Think of it as delivering a small program to the TV, which executes the program
based on user interaction - the user input is delivered to the program via the
remote. The ATSC program guide works this way with PSIP metadata.
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?
3 mbps of data to every home that choose to use it. There is NOTHING dedicated
to a single home - you are broadcasting this interactive "app" along with the
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?
This entire conversation is absurd. You are stretching the limits or reality
and my patience with this garbage.
With the numbers you have just calculated above, explain how would you
support on demand TV with the public airwaves ATSC 3.0 channel?
Who said anything about on demand programs Bert?
This thread started with the premise that there is not enough spectrum to
support on demand services. I then explained how you can add interactivity to
broadcasts and referenced the ATSC standard that makes it possible.
Talking about twisted!
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