[opendtv] Re: Global standard

  • From: "Mike Tsinberg" <Mike@xxxxxxxxxxxxxx>
  • To: <opendtv@xxxxxxxxxxxxx>
  • Date: Tue, 1 May 2012 13:47:07 -0400

I agree we need mobility. And it's coming through WiFi, 3G, 4G etc.

 

FCC is very slow. Last time we got basic structure of digital standard ready
in 1987. The FCC formalized that in 1997 and official switch was in 2007.
The DVD done privately took only 2 years. On the Internet new format
proliferation maybe faster. On the other had it seems Internet need no
standardization because according to Bert all it this happens de-facto with
big hungry wolf (Apple) eats everybody else. What do you think?

 

Best Regards,

Mike Tsinberg

http://keydigital.com <http://keydigital.com/> 

 

 

 

From: opendtv-bounce@xxxxxxxxxxxxx [mailto:opendtv-bounce@xxxxxxxxxxxxx] On
Behalf Of Mark Aitken
Sent: Tuesday, May 01, 2012 9:46 AM
To: opendtv@xxxxxxxxxxxxx
Cc: Manfredi, Albert E
Subject: [opendtv] Re: Global standard

 

We need mobility. With a well designed system that includes LPDC, we should
be able to get 10-12Mb/s mobile. With HEVC we should then be able to (in the
not to far future) get 3 or 4 1080p streams Mobile, 6 or 8 720p streams
Mobile, 12 or 15 480p streams Mobile.

IP allows use of common browsers might be one way to look at 'why' IP.

So, as to your question of the future for this broadcast model'. If we do
the above the answer is a resounding "YES" to the future.

But why limit the model to 6MHz channel slices into the future? You can get
more efficiency with broader bandwidths.

Thoughts?

Mark

On 4/30/2012 4:53 PM, Manfredi, Albert E wrote: 

Mike Tsinberg wrote:
 

Can we fit two or more 1080i signals into that channel?

 
 
The answer to that question is, "You can hope to fit two 1080i streams over
a single 6 MHz channel a lot better if you DO NOT insist on the unnecessary
IP overhead!"
 
What's nice about DVB-T2 is that it gets true spectral efficiency that's at
least as good as 8T-VSB. Meaning, you can actually achieve better b/s/Hz at
the same C/N margin requirement, as 8T-VSB. This is because they have gone
to the low density parity check scheme.
 
Combine that with H.265 compression, and you have a good scheme for OTA
broadcast.
 
BUT:
 
The question then is, do we really think this broadcast model has a future,
or do we think that everyone wants to use VOD anyway, and that therefore
optimizing for broadcast, optimizing for two 1080i streams per 6 MHz
channel, and optimizing for few transmit towers, no longer makes any sense?
 
That's the issue. Perhaps your questions aren't the right ones to ask?
Perhaps Mark Aitken's approach is more likely for the future, which means
(IMO) that you accept lower spectral efficiency AND a very questionable role
for most of the local broadcasters in the future?
 
Bert
 
 
 
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