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{{More citations needed|date=March 2023}}{{Short description|Multimedia broadcasting service for mobile}}
{{external links|date=August 2011}}
{{Infobox company
[[Image:1seg logo.png|right|thumb|200px|Logo for 1seg]]
|name = 1seg
|type = [[Privately held company|Private]]
|foundation = 2005<br>[[Japan]]
|location = [[Japan]]
|logo = 1seg logo.svg
}}
{{Table Digital video broadcast standards}}
{{Table Digital video broadcast standards}}
{{nihongo|'''1seg'''|ワンセグ|wansegu}} is a mobile terrestrial digital audio/video and data broadcasting service in [[Japan]], [[Argentina]], [[Brazil]], [[Chile]], [[Uruguay]], [[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) '''seg'''ment for mobile receivers, hence the name, "1seg" or "One Seg".
{{nihongo|'''1seg'''|ワンセグ|wansegu}} 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#ISDB-T|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 [[High-definition television|HDTV]] broadcast signal occupies 12 segments, leaving the remaining (13th) '''seg'''ment 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 per second|frame/s]] transmission setting (Japanese broadcasts are under the 15 frame/s transmission setting).
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 rate|frame/s]] transmission setting (Japanese broadcasts are under the 15 frame/s transmission setting).


== Technical information ==
== Technical information ==
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{{main article|ISDB}}
{{main article|ISDB}}
[[Image:ISDB-T CH Seg Prog allocation.svg|left|350px|The ISDB-T channel allocation scheme.]]
[[Image:ISDB-T CH Seg Prog allocation.svg|left|350px|The ISDB-T channel allocation scheme.]]
The [[ISDB]]-T system uses the [[UHF]] band at frequencies between 470 and 770&nbsp;MHz (806&nbsp;MHz in Brazil), giving a total bandwidth 300&nbsp;MHz. The bandwidth is divided into fifty name channels 13 through 62. Each channel is 6&nbsp;MHz wide consisting of a 5.57&nbsp;MHz wide signalling band and a 430&nbsp;kHz guard band to limit cross channel interference. Each of these channels is further divided into 13 segments, each with 428&nbsp;kHz of bandwidth. 1 seg uses a single of these segments to carry the 1seg transport stream.
The [[ISDB]]-T system uses the [[Ultra high frequency|UHF]] band at frequencies between 470 and 770&nbsp;MHz (806&nbsp;MHz in Brazil), giving a total bandwidth 300&nbsp;MHz. The bandwidth is divided into fifty name channels 13 through 62. Each channel is 6&nbsp;MHz wide consisting of a 5.57&nbsp;MHz wide signalling band and a 430&nbsp;kHz guard band to limit cross channel interference. Each of these channels is further divided into 13 segments, each with 428&nbsp;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.
1seg, like ISDB-T uses [[Phase-shift keying#Quadrature phase-shift keying .28QPSK.29|QPSK]] for [[modulation]], with 2/3 [[Error correction code|forward error correction]] and 1/4 guard ratio. The total datarate is 416&nbsp;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 ([[Electronic program guide|EPG]], interactive services, etc.) is transmitted using [[Broadcast Markup Language|BML]] and occupies the remaining 10 to 100 kbit/s of bandwidth.
The television system uses an [[Advanced Video Coding|H.264/MPEG-4 AVC]] video stream and an [[High-Efficiency Advanced Audio Coding|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&nbsp;kbit/s. Audio conforms to [[High-Efficiency Advanced Audio Coding|HE-AAC]] profile, with a bitrate of 48 to 64&nbsp;kbit/s. Additional data ([[Electronic program guide|EPG]], interactive services, etc.) is transmitted using [[Broadcast Markup Language|BML]] and occupies the remaining 10 to 100&nbsp;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.
Conditional access and copy control are implemented in 1seg broadcasting by the use of [[Broadcast flag|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 ==
[[Broadcast Markup Language]] (BML), is a data-transmission service allowing text to be displayed on a 1seg TV screen.
[[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 (Japan)|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.
The text contains news, sports, weather forecasts, emergency warnings such as [[Earthquake Early Warning (Japan)|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).
[[Electronic program guide|EPG]] (program guides) is not included, but transmitted in separate stream (EIT).


== Multiple-program arrangement ==
== Multiple-program arrangement ==
On June 23, 2008, broadcaster [[Tokyo Metropolitan Television|Tokyo MX]] officially began using {{nihongo|''multiple-program arrangement''|マルチ編成|Maruchi hensei}} 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 {{nihongo|'''1seg2''' or '''Oneseg2'''|[[:ja:ワンセグ2|ワンセグ2]]|Wansegu tsū}}.
On June 23, 2008, broadcaster [[Tokyo MX]] officially began using {{nihongo|''multiple-program arrangement''|マルチ編成|Maruchi hensei}} 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 {{nihongo|'''1seg2''' or '''Oneseg2'''|[[:ja:ワンセグ2|ワンセグ2]]|Wansegu tsū}}.


[[NHK Educational TV]] (from 1 April 2009) and {{nihongo|Nara Television|[[:ja:奈良テレビ放送|奈良テレビ放送]]|Nara terebi hōsō}} (from 1 December 2009) are also started for several number of programs.
[[NHK Educational TV]] (from 1 April 2009) and {{nihongo|Nara Television|[[:ja:奈良テレビ放送|奈良テレビ放送]]|Nara terebi hōsō}} (from 1 December 2009) are also started for several number of programs.
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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.<ref>[http://www.jeita.or.jp/japanese/stat/cellular/2007/index.htm 2007年度移動電話国内出荷実績]; (2007 fiscal year mobile phone ship out record) (In Japanese)</ref>
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.<ref>[http://www.jeita.or.jp/japanese/stat/cellular/2007/index.htm 2007年度移動電話国内出荷実績]; (2007 fiscal year mobile phone ship out record) (In Japanese)</ref>


==Receivers==
== Receivers ==
[[Image:One_seg_reception_201209.jpg|right|thumb|250px|
[[Image:One_seg_reception_201209.jpg|right|thumb|250px|1seg TV reception image of [[weather forecasting]] on a touchscreen [[smartphone]], [[NTT DoCoMo]]'s [[NEC]] MEDIAS {{ill|N-04C|ja}}.]]
[[File:Nintendo DS with DSTV.jpg|thumb|[[Nintendo DS]] with "DS Terebi" 1seg tuner.]]
1seg TV reception image of [[weather forecasting]] on the [[Mobile phone]], [[NTT DoCoMo]]'s [[NEC]] MEDIAS N-04C.]]
[[File:PSP Japan 1SEG.JPG|thumb|[[Sony]] [[PlayStation Portable|PSP Slim]] with 1seg tuner.]]
;[[Electronic dictionary]]
[[File:Pioneer AVIC-BZ500.jpg|thumb|Pioneer AVIC BZ500 with a large touchscreen, DVD, 1seg, and GPS]]
: {{ja icon}} [http://www.sharp.co.jp/papyrus/lineup/pw-tc900/index.html Sharp Papyrus PW-TC900]
; [[Electronic dictionary]]
: {{ja icon}} [http://www.sharp.co.jp/papyrus/lineup/pw-tc920/index.html Sharp Papyrus PW-TC920]
: {{ja icon}} [http://www.sharp.co.jp/papyrus/lineup/pw-tc930/index.html Sharp Papyrus PW-TC930]
: {{in lang|ja}} Sharp Papyrus PW-TC900
: {{ja icon}} [http://www.sharp.co.jp/edictionary/lineup/brain/pw-tc980/ Sharp Papyrus PW-TC980]
: {{in lang|ja}} Sharp Papyrus PW-TC920
: {{in lang|ja}} Sharp Papyrus PW-TC930
;PC connect type
: {{in lang|ja}} Sharp Papyrus PW-TC980
: {{ja icon}} [http://www.pixela.co.jp/news/2006/0329.html Pixela PC]
; PC connect type
: {{ja icon}} [http://www.sknet-web.co.jp/sknet/news_release/mtv1d.htm Monster TV 1D] [[PC card]] Type II 1seg receiver by SKNET
: {{in lang|ja}} [[Pixela Corporation|Pixela]] PC
: {{ja icon}} [[Cowon]] [http://www.cowonjapan.com/product_wide/product_d2_1seg.php D2TV]
: {{in lang|ja}} Monster TV 1D [[PC Card|PC card]] Type II 1seg receiver by SKNET
: {{in lang|ja}} [[Cowon]] D2TV
: and more.
: and more.
;[[Car navigation system]]
; [[Automotive navigation system|Car navigation system]]
: {{ja icon}} [http://www.sanyo.co.jp/koho/hypertext4/0603news-j/0323-2.html Sanyo One-seg & car navigation system]
: {{in lang|ja}} Sanyo One-seg & car navigation system
: {{in lang|ja}} [https://jpn.pioneer/ja/support/manual/manual_pdf.php?m_id=14290 Pioneer AVIC BZ500]
: and more.
: and more.
;[[Handheld game console]]
; [[Handheld game console]]
: {{ja icon}} [http://pspupdates.qj.net/-UPDATE-Sony-united-colors-of-the-PSP-2000-and-the-new-TV-tuner/pg/49/aid/97801 1seg PSP-2000 Tuner]
: {{in lang|ja}} [https://web.archive.org/web/20070808004341/http://pspupdates.qj.net/-UPDATE-Sony-united-colors-of-the-PSP-2000-and-the-new-TV-tuner/pg/49/aid/97801 1seg PSP-2000 Tuner]
: {{ja icon}} [[Nintendo DS]] (via an add-on called [https://www.nintendo.co.jp/ds/unsj/index.html "DS Telebi"])
: {{in lang|ja}} [[Nintendo DS]] (via an add-on called "DS Terebi")
;[[Portable devices]]
; [[Mobile device|Portable devices]]
;[[Set top box]]
; [[Set-top box|Set top box]]
;Others
; Others
: {{ja icon}} [[Sony]] [[Walkman]] [https://web.archive.org/web/20071011001531/http://www.ecat.sony.co.jp/walkman/product.cfm?PD=29380&KM=NW-A919 NW-A919]
: {{in lang|ja}} [[Sony]] [[Walkman]] NW-A919
: {{ja icon}} [[Kodak]] [http://www.kagaht.co.jp/news/eltv.html 3-inch OLED TV]
: {{in lang|ja}} [[Kodak]] 3-inch OLED TV
: and more.
: and more.
;[[Mobile Phones]]
; [[Mobile phone]]s
:The first mobile phone handsets able to support 1seg were sold by [[Au (mobile phone company)|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|garakei]] and [[Android (operating system)|Android]] phones, [[iOS]] users must purchase a third-party 1seg antenna separately).
: The first mobile phone to support 1seg was the [[Sanyo]] {{ill|W33SA|ja}} which was released by [[Au (mobile phone company)|au by KDDI]] to consumers in autumn 2005. Until around 2021, the vast majority of [[Japanese mobile phone culture|{{transl|ja|italic=no|garakei}}]] and carrier-branded [[Android (operating system)|Android]] phones sold in Japan featured support for 1seg. While [[iOS]] users have always required to purchase a third-party 1seg antenna separately in order to access 1seg, the rise of [[5G]] [[5G NR|NR]] and unlimited data plans means that 1seg support is gradually becoming less important, hence it is increasingly omitted on newer Japanese iOS and Android mobile devices.


== See also ==
== See also ==
Line 76: Line 85:


== External links ==
== External links ==
{{Commons category|1seg}}
{{Commons category}}
<!-- Hide dead link * [http://www.sasase.ics.keio.ac.jp/jugyo/2006/print/One_segment_broadcasting_p.pdf What is “One Seg” ?], [[PDF]] File, Sasaki Laboratory, [[Keio University]]. -->
<!-- Hide dead link * [http://www.sasase.ics.keio.ac.jp/jugyo/2006/print/One_segment_broadcasting_p.pdf What is “One Seg” ?], [[PDF]] File, Sasaki Laboratory, [[Keio University]]. -->
*{{cite news | title =TV programs go mobile as One Seg services begin | url =http://search.japantimes.co.jp/cgi-bin/nb20060401a2.html| publisher =[[The Japan Times]] | date =2006-04-01 | archiveurl =http://search.japantimes.co.jp/cgi-bin/nb20060401a2.html|archivedate =2008-01-10 }}
* {{cite news | title =TV programs go mobile as One Seg services begin | url =http://search.japantimes.co.jp/cgi-bin/nb20060401a2.html| archive-url =https://web.archive.org/web/20080110010101/http://search.japantimes.co.jp/cgi%2Dbin/nb20060401a2.html| publisher =[[The Japan Times]] | date =2006-04-01 | url-status =dead |archivedate =2008-01-10 }}
*[http://www.dibeg.org/service/oneseg/oneseg.htm One-Seg service for Mobile Devices][[PDF]] file, Digital Broadcasting Experts Group (DiBEG)
* [http://www.dibeg.org/ Digital Broadcasting Experts Group (DiBEG) promote ISDB-T]
* [https://web.archive.org/web/20090225220811/http://www.dibeg.org/seminar/0702seminar_in_indonesia/Indonesia%20seminar%20Presentation%203.pdf ISDB-T, Application, Present and Future], [[PDF]] File
* [https://web.archive.org/web/20090225220811/http://www.dibeg.org/seminar/0702seminar_in_indonesia/Indonesia%20seminar%20Presentation%203.pdf ISDB-T, Application, Present and Future], [[PDF]] File
* {{in lang|ja}} [https://web.archive.org/web/20051218102907/http://1seg.jp/ 1seg official site (Japanese)]
* [[Mobile phone]] and [[Personal Handy-phone System|PHS]] operators which provide 1seg phone receivers.
** [http://www.nttdocomo.co.jp/english/ NTT docomo]
** [http://www.au.kddi.com/english/ au by KDDI]
** [http://www.softbank.co.jp/en/ SoftBank Mobile]
** [http://www.willcom-inc.com/en/index.html WILLCOM]
* {{ja icon}} [http://www.dpa.or.jp/ Association for promotion of Digital Broadcasting (Japanese)]
* {{ja icon}} [http://1seg.jp/ 1seg promotion site (Japanese)]
* [http://wirelesswatch.jp/2011/02/15/access-ginga-edition-for-1seg-in-brazil/ ACCESS Ginga Edition for 1Seg in Brazil]
* [http://wirelesswatch.jp/2011/02/15/access-ginga-edition-for-1seg-in-brazil/ ACCESS Ginga Edition for 1Seg in Brazil]
*[http://nextvlatam.com/index.php/3-mobile-tv/gps-fitted-with-isdb-t-oneseg-sales-grow-in-brazil/ GPS fitted with ISDB-T OneSeg sales grow in Brazil]
* [https://web.archive.org/web/20120204103419/http://nextvlatam.com/index.php/3-mobile-tv/gps-fitted-with-isdb-t-oneseg-sales-grow-in-brazil/ GPS fitted with ISDB-T OneSeg sales grow in Brazil]


{{Video formats}}
{{Video formats}}


[[Category:ISDB]]
[[Category:Broadcast engineering]]
[[Category:Digital television]]
[[Category:Digital television]]
[[Category:Mobile telephone broadcasting]]
[[Category:Mobile television]]
[[Category:Mobile television]]
[[Category:Television transmission standards]]

Latest revision as of 21:45, 25 April 2024

1seg
Company typePrivate
Founded2005
Japan
HeadquartersJapan

1seg (ワンセグ, wansegu) 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

[edit]
The ISDB-T channel allocation scheme.
The ISDB-T channel allocation scheme.

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

[edit]

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

[edit]

On June 23, 2008, broadcaster Tokyo MX officially began using multiple-program arrangement (マルチ編成, Maruchi hensei) 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 1seg2 or Oneseg2 (ワンセグ2, Wansegu tsū).

NHK Educational TV (from 1 April 2009) and Nara Television (奈良テレビ放送, Nara terebi hōsō) (from 1 December 2009) are also started for several number of programs.

Popularity

[edit]

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

[edit]
1seg TV reception image of weather forecasting on a touchscreen smartphone, NTT DoCoMo's NEC MEDIAS N-04C [ja].
Nintendo DS with "DS Terebi" 1seg tuner.
Sony PSP Slim with 1seg tuner.
Pioneer AVIC BZ500 with a large touchscreen, DVD, 1seg, and GPS
Electronic dictionary
(in Japanese) Sharp Papyrus PW-TC900
(in Japanese) Sharp Papyrus PW-TC920
(in Japanese) Sharp Papyrus PW-TC930
(in Japanese) Sharp Papyrus PW-TC980
PC connect type
(in Japanese) Pixela PC
(in Japanese) Monster TV 1D PC card Type II 1seg receiver by SKNET
(in Japanese) Cowon D2TV
and more.
Car navigation system
(in Japanese) Sanyo One-seg & car navigation system
(in Japanese) Pioneer AVIC BZ500
and more.
Handheld game console
(in Japanese) 1seg PSP-2000 Tuner
(in Japanese) Nintendo DS (via an add-on called "DS Terebi")
Portable devices
Set top box
Others
(in Japanese) Sony Walkman NW-A919
(in Japanese) Kodak 3-inch OLED TV
and more.
Mobile phones
The first mobile phone to support 1seg was the Sanyo W33SA [ja] which was released by au by KDDI to consumers in autumn 2005. Until around 2021, the vast majority of garakei and carrier-branded Android phones sold in Japan featured support for 1seg. While iOS users have always required to purchase a third-party 1seg antenna separately in order to access 1seg, the rise of 5G NR and unlimited data plans means that 1seg support is gradually becoming less important, hence it is increasingly omitted on newer Japanese iOS and Android mobile devices.

See also

[edit]

References

[edit]
  1. ^ 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(%))
  2. ^ 2007年度移動電話国内出荷実績; (2007 fiscal year mobile phone ship out record) (In Japanese)
[edit]
  • "TV programs go mobile as One Seg services begin". The Japan Times. 2006-04-01. Archived from the original on 2008-01-10.
  • ISDB-T, Application, Present and Future, PDF File
  • (in Japanese) 1seg official site (Japanese)
  • ACCESS Ginga Edition for 1Seg in Brazil
  • GPS fitted with ISDB-T OneSeg sales grow in Brazil