Digital TV middleware, standards and trends
Definition digital television middleware Digital television middleware for an official, or there is no standard definition, there's digital television middleware system, generally refers to embedded in the TV receiver terminal, located above the receiving device driver layer software, interactive applications and system isolation resources software layer. Middleware allows application independent of the receiver hardware and software platform. Thus, in the same television network, with different hardware components and design architecture STB Can run the same applications; the same time, different software companies can develop based on the same application programming interface, and run on a different set-top boxes.
Middleware allows TV operators to use set-top box costs and significantly reduce application costs, and enhance marketing edge and increased digital television penetration.
Although the middleware is installed in the digital television receiving equipment, but its front end to receive and process data and is closely related to broadcast from the receiver front-end system provides the data format, or front-end system and receiving terminal on the data format, broadcast agreement must be concerted.
The course of digital TV operations
1994 12 , MPEG / DVB Standards promulgated
1994 , DirecTV launched the first number in the United States Satellite TV Broadcasting
1995 6 months, the French Canal + in Europe, pioneered standards-based DVB satellite digital television;
1996-1997, Europe, the United States there are several operators have introduced satellite-based digital television and cable networks; in 1998 the United Kingdom Digital Terrestrial Television Organization (DTG) launched the world's first terrestrial digital television. This is a digital television operations of several typical.
Foreign mainstream middleware and related standards
Value-added business operations, is the television Digital The starting point and ultimate aim of foreign digital TV operator, to begin the start since there is embedded in the middleware in order to carry out value-added services to provide protection; early foreign middleware platform are: OpenTV, Mediahighway (scripting language version), NDSCore (visit device Edition), Access (Japan), Opera, Espial, Liberate, MHEG-5 engines from 1998, DVB digital television middleware development standards into the different platforms to Java-based, can also support HTML and JavaScript The MHP standard scripting language up. In early 2001, released MHP1.0 MHP middleware specification supports with: OSMOSYS, Alticast, Mediahighway (Java version), IDway, etc.
Foreign middleware standards are currently abroad, basically is based on the GEM standard middleware kernel extension. GEM is a subset of MHP is to unify the League of American OpenCable OCAP middleware specification drawn up, now evolved into the ACAP specification, while supporting Java Virtual Machine and HTML engines; Japan ARIB BML middleware specification also gave up using GEM as the middleware specification for the base; Brazil announced Ginga-J middleware specification is also based on GEM of China since early 2002 to develop middleware specification, is also used in the technical system based on GEM
Major middleware platform application development language used
Proprietary middleware platform application development language
OpenTV: like C, interpreted scripting language
NDSCore: HTML + JS language Mediahighway1.0 version Support the MHP middleware platform Alticast OSMOSYS Mediahighway new version (now as NDS middleware)
To JavaScript as an application development language browser manufacturers
IPanel Jia Chong EnReach Liberate (has been thought to move the United States acquired)
DVN Support national middleware DTVM specification (Java-based) middleware platform, currently known are:
Shanghai Blue Letter With Chau Electronic Shanghai Panorama There had also been another scripting language as the language of business development for digital TV: Flash, Python, etc.
Java middleware such as the popular digital TV application development language
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