[opendtv] Re: 1-seg
- From: "Bob Miller" <robmxa@xxxxxxxxx>
- To: opendtv@xxxxxxxxxxxxx
- Date: Sun, 11 Jan 2009 13:04:16 -0500
There is some market in Europe for cell phones that receive ordinary
DVB-T also.
Bob Miller
On Sun, Jan 11, 2009 at 11:55 AM, Tom Barry <trbarry@xxxxxxxxxxx> wrote:
> 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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