[[Category:Template:Pagetype with short description]]Template:Short description/lowercasecheckTemplate:Main other
Logo for 1seg
Template:Table Digital video broadcast standards
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Template:Nihongo is a mobile terrestrial digital audio/video and data broadcasting service in Japan, Argentina, Brazil, Chile, Uruguay, Paraguay, Peru and the Philippines. Service began experimentally during 2005 and commercially on April 1, 2006. It is designed as a component of ISDB-T, the terrestrial digital broadcast system used in those countries, as each channel is divided into 13 segments, with a further segment separating it from the next channel; an HDTV broadcast signal occupies 12 segments, leaving the remaining (13th) segment for mobile receivers, hence the name, "1seg" or "One Seg".
Its use in Brazil was established in late 2007 (starting in just a few cities), with a slight difference from the Japanese counterpart: it is broadcast under a 30 frame/s transmission setting (Japanese broadcasts are under the 15 frame/s transmission setting).
Technical information[]
Template:Unreferenced section
- Main article: ISDB
The ISDB-T system uses the UHF band at frequencies between 470 and 770 MHz (806 MHz in Brazil), giving a total bandwidth 300 MHz. The bandwidth is divided into fifty name channels 13 through 62. Each channel is 6 MHz wide consisting of a 5.57 MHz wide signalling band and a 430 kHz guard band to limit cross channel interference. Each of these channels is further divided into 13 segments, each with 428 kHz of bandwidth. 1 seg uses a single of these segments to carry the 1seg transport stream.
1seg, like ISDB-T uses QPSK for modulation, with 2/3 forward error correction and 1/4 guard ratio. The total datarate is 416 kbit/s.
The television system uses an H.264/MPEG-4 AVC video stream and an HE-AAC audio stream multiplexed into an MPEG transport stream. The maximum video resolution is 320x240 pixels, with a video bitrate of between 220 and 320 kbit/s. Audio conforms to HE-AAC profile, with a bitrate of 48 to 64 kbit/s. Additional data (EPG, interactive services, etc.) is transmitted using BML and occupies the remaining 10 to 100 kbit/s of bandwidth.
Conditional access and copy control are implemented in 1seg broadcasting by the use of Broadcast Flag-like structure contained in the "Copy Control Descriptor" within the broadcast. The broadcast contents themselves are not encrypted, but the Copy Control information forces the device to encrypt stored recordings and disallows making a copy of the recording.
Broadcast Markup Language[]
Broadcast Markup Language (BML), is a data-transmission service allowing text to be displayed on a 1seg TV screen.
The text contains news, sports, weather forecasts, emergency warnings such as Earthquake Early Warning, etc. free of charge. Further information can be found through links to content on websites, frequently those belonging to the television station itself.
EPG (program guides) is not included, but transmitted in separate stream (EIT).
Multiple-program arrangement[]
On June 23, 2008, broadcaster Tokyo MX officially began using Template:Nihongo technology to simultaneously broadcast two programs on a single divided segment. Most 1seg receivers manufactured after September 2008 are compatible with this technology. Multiple-program arrangement in 1seg is named as Template:Nihongo.
NHK Educational TV (from 1 April 2009) and Template:Nihongo (from 1 December 2009) are also started for several number of programs.
Popularity[]
Until the end of March 2008, Japanese regulation required that the programs on 1seg were fundamentally the same as those broadcast on the equivalent HDTV channel. On April 1 the regulation was revised, and experimental programs by 1seg or third parties have begun airing on several stations.
On January 16, 2008, JEITA released their monthly shipping survey showing 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.[1]
In the fiscal year of 2007, on average 45% of mobile phones had 1seg reception capability out of the 22.284 million units sold. The percent increased from 26.8% in April 2007 to 64.2% at end of fiscal year March 2008.[2]
Receivers[]
1seg TV reception image of weather forecasting on the Mobile phone, NTT DoCoMo's NEC MEDIAS N-04C.
- Electronic dictionary
- Template:In lang Sharp Papyrus PW-TC900
- Template:In lang Sharp Papyrus PW-TC920
- Template:In lang Sharp Papyrus PW-TC930
- Template:In lang Sharp Papyrus PW-TC980
- PC connect type
- Template:In lang Pixela PC
- Template:In lang Monster TV 1D PC card Type II 1seg receiver by SKNET
- Template:In lang Cowon D2TV
- and more.
- Car navigation system
- Template:In lang Sanyo One-seg & car navigation system
- and more.
- Handheld game console
- Template:In lang 1seg PSP-2000 Tuner
- Template:In lang Nintendo DS (via an add-on called "DS Terebi")
- Portable devices
- Set top box
- Others
- Template:In lang Sony Walkman NW-A919
- Template:In lang Kodak 3-inch OLED TV
- and more.
- Mobile Phones
- The first mobile phone handsets able to support 1seg were sold by au by KDDI to consumers in autumn 2005. Today, almost all mobile phones sold in Japan feature a 1seg antenna (only for [[Japanese mobile phone culture|Template:Transl]] and Android phones, iOS users must purchase a third-party 1seg antenna separately).
See also[]
- Digital terrestrial television
- DMB - South Korea
- DVB-H
- ISDB-T
- ISDB-T International
References[]
- ↑ Source; the article of Yomiuri Shimbun 2008-01-16, area version 13S page 8, and (Japanese language);2007 fiscal year monthly base shipment quantity (2007年度移動電話国内出荷実績、ワンセグ搭載比率（%）)
- ↑ 2007年度移動電話国内出荷実績; (2007 fiscal year mobile phone ship out record) (In Japanese)
External links[]
Template:Commons category
- Template:Cite news
- ISDB-T, Application, Present and Future, PDF File
- Template:In lang 1seg official site (Japanese)
- ACCESS Ginga Edition for 1Seg in Brazil
- GPS fitted with ISDB-T OneSeg sales grow in Brazil
Template:Video formats