[opendtv] Re: 1-seg
- From: Tom Barry <trbarry@xxxxxxxxxxx>
- To: opendtv@xxxxxxxxxxxxx
- Date: Sun, 11 Jan 2009 11:55:59 -0500
Interesting. I found there is a Wikipedia article on 1-seg
<http://en.wikipedia.org/wiki/1seg>
That link states they break a 6 mhz channel into 13 segments that after
2/3 FEC each carry a usable payload of 415 kbps. The max video rez is
320x240, at video bit rates of 220-320 kbps.
On usage:
"On 2008-01-16, JEITA learned that the result of their monthly shipping
out quantity survey showed approx. 4.806 million mobile phones were sold
in Japan in November 2007. Of these, approx. 3.054 million phones, 63.5%
of the total, can receive 1seg broadcasts. [2]
In fiscal year 2007, total average 45.0% of mobile phone has 1seg
reception capability out of 22.284 million units sold, the percent has
been increased 26.8% in April 2007 to 64.2% at end of fiscal year March
2008."
I wonder if the phone companies charge extra (monthly) for this feature?
Having 63% of new phones being able to receive 1-seg would seem to be
something of a winner there, even if it is a lower bit rate and
resolution than I would personally like.
- Tom
Craig Birkmaier wrote:
At 10:35 AM -0500 1/10/09, Tom Barry wrote:
Craig Birkmaier wrote:
...
And to save you a reply, This one DIDN'T work...
Craig
It occurs to me I have not been keeping up with what the rest of the
world is doing in mobile, especially broadcast. Has any country
implemented a working land based mobile/hand-held broadcast TV system
yet, with any technology? If so, what are they using?
The most successful land-based mobile TV broadcast service is in Japan,
which is using the ISDB standard; the mobile service is called 1-seg. I
believe that the government mandates that the mobile 1-Seg service
simulcasts the programming carried on the full bandwidth ISDB service
for fixed receivers. In February the installed base of phones with 1-seg
capabilities in Japan passed the 20 million mark - I can't find anything
more recent in terms of numbers.
The satellite based mobile TV service in Korea is also highly popular.
Regards
Craig
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