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A method and device for recovering information in interactive digital TV systems

A digital TV system and a technology for recovering information, applied in pulse modulation TV signal transmission, electrical components, image communication, etc.

Inactive Publication Date: 2007-07-18
THOMSON LICENSING SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0032] However, additional improvements are needed, on the one hand, to reduce the portion of bandwidth occupied by service information and, on the other hand, to provide applications with optimal access to information

Method used

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  • A method and device for recovering information in interactive digital TV systems
  • A method and device for recovering information in interactive digital TV systems
  • A method and device for recovering information in interactive digital TV systems

Examples

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Embodiment Construction

[0060] Referring to FIG. 1, an interactive digital television system 106 includes a transmission center 101 and at least one terminal device 111 belonging to an installation base of terminal devices.

[0061] The terminal device 111 includes a receiver / decoder device 102 and a display unit 113 .

[0062] The receiver / decoder device 102 has a hardware and / or software architecture comprising, inter alia: a non-volatile memory 103, called cache memory, typically in the form of a hard disk; and an autoloader device 103a.

[0063] According to the invention, the receiver / decoder device 102 also comprises an information recovery device 103b implementing the method of the invention.

[0064] The digital television system 106 also includes an interactive device 104 and a conditional access system 105 used as a return channel.

[0065] As a general rule, digital television system 106 uses an MPEG-type compression system to transmit compressed digital signals.

[0066] In the transmis...

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PUM

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Abstract

The method according to the invention is mainly implemented in terminal devices of an interactive digital TV system. The method comprises a step for storing in a cache memory of the terminal device information transported in a data stream of the system. The method also comprises a characteristic step consisting in searching (E41), according to at least one predefined selection criterion, for requested information in at least one of the information carriers formed by the data stream and the cache memory. The method finds its preferred application in interactive digital TV systems compliant with the MPEG-DVB standards. Preferably, the information and / or MPEG tables are stored in the cache memory according to a structural organization similar to that of the information and / or MPEG tables in the data stream. The invention provides the application programs with optimal access to the MPEG tables and service information.

Description

technical field [0001] The present invention generally relates to recovery of information transmitted in an interactive digital television system. More specifically, the invention relates to the recovery of information transmitted for applications running in terminal equipment of an interactive digital television system. [0002] The invention applies primarily, but not exclusively, to the recovery of service information associated with television channels and interactive services included in program packages transmitted by a digital television system. [0003] In the following description, the term "service" (in the case of a service delivered to a user or subscriber via an interactive digital system) is used equally to denote television channels and services, whether interactive or not. Background technique [0004] In the prior art, digital television systems are known such as various DVB (Digital Video Broadcasting) and MPEG (Moving Picture Experts Group) developed by E...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/24G06F9/445
CPCH04N21/235H04N21/435H04N21/432H04N21/433
Inventor 格扎维埃·阿库斯
Owner THOMSON LICENSING SA
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