Multimedia Home Platform: Béda antarrépisi
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'''Multimedia Home Platform''' (DVB-MHP) nyaeta hiji [[standardisasi|standar]] sistim [[middleware]] muka nu dirancang ku proyek [[DVB]] keur televisi digital interaktif. MHP ngidinan ditarima jeung dijalankeunnana aplikasi dumasar [[Java (basa program)|Java]] interaktif dina hiji set TV. Aplikasi [[TV interaktif]] bisa dikirim kana saluran siaran, babarengan jeung ''stream'' audio katut video. Apliaksi ieu contona bisa mangrupa jaa informasi, ''game'', ''voting'' interaktif, surelek, SMS atawa keur balanja. Keur sakabaeh aplikasi interaktif diperlukeun hiji saluran tambahan keur balik deui.
*[[Multimedia Home Platform]]▼
== Deployment ==
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By mid-2005 DVB-MHP largest deployments are in [[Italy]] ([[DVB-T]]) and [[Korea]] ([[ATSC Standards|ATSC]]), with trials or small deployments in [[Germany]], [[Finland]], [[Spain]], [[Austria]] and [[Australia]].
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The [[USA|U.S.]] cable industry has specified its own middleware system referred as [[OpenCable Application Platform|OCAP]], which is largely based on MHP.
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Currently, [[Belgium]]'s largest cable provider [[Telenet (Belgium)|Telenet]] is rolling out their DVB-MHP system, called DigiBox. Norway's upcoming terrestrial digital TV network [[NTV]] will also use the DVB-MHP standard.
== Tehnologi ==
[[Image:MHP-software stack english.png|frame|right|MHP software [[stack]]]]
The MHP specifies an extensive application execution environment for digital interactive TV, independent of the underlying, vendor-specific, hardware and software. This execution environment is based on the use of a [[Java platform|Java]] [[virtual machine]] and the definition of generic APIs that provide access to the interactive digital TV [[Computer terminal|terminal]]'s typical resources and facilities. The interoperable MHP applications are running on top of these APIs. A so-called Navigator-application, which is part of the terminal software, allows the user the access to all MHP applications and other DVB services (like TV and radio).
The MHP is just a part of a family of specifications, which all base on the [[Globally Executable MHP]] (GEM)-Standard, which was defined to allow the world-wide adoption of MHP.
== DVB-HTML ==
{{main|DVB-HTML}}
MHP applications come in two flavours. The first type are [[DVB-HTML]] applications. These are not very popular, partly because the specification for DVB-HTML was only completed with [[MHP 1.1]], and partly because many broadcasters, box manufacturers and content developers find it too complex and difficult to implement. DVB-HTML applications are a set of [[HTML]] pages that are broadcast as part of a service. The spec is based around a modularized version of [[XHTML]] 1.1, and also includes [[Cascading Style Sheets|CSS]] 2.0, [[Document Object Model|DOM]] 2.0, and [[ECMAScript]].
== DVB-J ==
The second, and by far the most popular flavour is [[DVB-J]] ([[DVB-Java]]) applications. These are written in [[Java (programming language)|Java]] using the MHP [[API]] set and consist of a set of [[class (computer science)|class]] files that are broadcast with a service. DVB-Java applications are known as "[[Xlet]]s". These are a concept similar to [[applets]] for Web pages that has been introduced by Sun in the [[JavaTV]] specification. Like applets, the xlet interface allows an external source (the application manager in the case of an MHP receiver) to start and stop an application.
== Return channel ==
The MHP [[set-top box]]es may provide a [[backchannel]] for applications that wish to communicate with the outside world, for example a voting or shopping application. Typical upstream backchannels are phone line or [[broadband]] Internet connection ([[Asymmetric Digital Subscriber Line|ADSL]], using a simple ADSL modem included in the set-top box). [[DVB-RCT]] (Return Channel Terrestrial) is a wireless technology utilizing the DVB infrastructure. It provides a VHF/UHF Wireless Return Channel back to the broadcaster for Interactive
Terrestrial TV. It provides a data-rate of several kbit/s per user, for voting, polls, email, teleshopping, etc.
This is the difference with [[zapper]] set-top boxes.
== Tempo oge ==
* [[ARIB]]
* [[BD-J]]
* [[Interactive television]]
* [[IP over DVB]]
* [[IPTV]]
* [[MHEG-5]], ''standar saingan''
* [[Set-top box]]
* [[OSGi]]
* [[Zapper]]
* Internet protocol [[datacasting]] (IPDC)
* [[DVB-H]]
== Rujukan ==
* Ulrich Reimers: DVB, The Family of International Standards for Digital Video Broadcasting, Second Edition, 2005, ISBN 3-540-43545-X (chapter 14, MHP)
== Tumbu luar ==
*[http://www.mhp.org/ Official MHP website] maintained by the [[DVB]] Project Office.
*[http://www.mhp.org/mhp_technology/gem/ GEM specification]
*[http://www.mhp-interactive.org/ MHP tutorials]
*[http://www.mhp-knowledgebase.org MHP Knowledge Database]
*[http://www.openmhp.org/ OpenMHP] - MHP-Open Source Project
*[http://java.sun.com/products/javatv Sun Microsystems' Java TV]
*[http://xletview.sourceforge.net/ xleTView] - xleTView, MHP-Open Source Emulator at Sourceforge
*[http://www.interactivetvweb.org Interactive-TV-Web] - MHP/OCAP Website from Steven Morris
*[http://www.dvb.org/(RoxenUserID=5fac63d0cfe60e3c5b157acb99095c88)/technology/fact_sheets/WP03_RCT.pdf dvb.org - DVB-RCT Return Channel Terrestrial]
*[http://www.interactivetvforum.org/ Interactive TV Forum]
[[Category:Televisi interaktif]]
[[Category:Platform Java]]
[[Category:Java virtual machine]]
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