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Control method for clock synhrronous preservation in network degital TV system

A technology for digital TV system and clock synchronization, which is applied in parts of TV system, digital transmission system, color TV parts, etc. It can solve problems such as complex processing, inability to remove jitter, and insufficient integration of service modes, etc., to achieve good Expansibility, applicability, and simple structure

Inactive Publication Date: 2005-03-02
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, the above methods are all based on the idea of ​​correcting the processing jitter and transmission jitter separately, which not only makes the processing complicated, but also cannot eliminate all jitter, and does not fully integrate the service mode of network transmission.

Method used

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  • Control method for clock synhrronous preservation in network degital TV system
  • Control method for clock synhrronous preservation in network degital TV system
  • Control method for clock synhrronous preservation in network degital TV system

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Embodiment Construction

[0021] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0022] Since the digital TV service transmission mode of the digital TV broadcasting network is a broadcast form, while the broadband IP network service transmission mode is a two-way, shared, best-effort service form, so it is more suitable to transmit the single program system transmission stream in the broadband IP network The transmission operation mode of the IP network. Therefore, it is necessary to extract and analyze the information of the digital TV programs entering the broadband IP network, as well as demultiplex and re-multiplex the digital TV programs to generate a single-program system transport stream suitable for IP network transmission.

[0023] Such as figure 1 , 4 As shown, in the process of realizing the IP network transmission of digital TV services, digital TV programs can come from traditional...

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Abstract

A control method for a network digital TV system clock synchronous maintenance introduces digital TV program into broadband IP network to keep the time information in demultiplex and remultiplex units and resumes the original time information according to the information in transmission stream at the receive end after network transmission and transmits effective data of the said program in the network with the garble rate to get the system clock synchronization at the code and decode ends with constant code rate time information model.

Description

technical field [0001] The present invention relates to a control method used in the technical field of network digital TV transmission, in particular to a control method for maintaining clock synchronization of a network digital TV system. technical background [0002] At present, the common digital TV coding technology adopts the MPEG-2 video and audio coding standard, which is described by the ISO / IEC13818 file, which also defines the system layer structure of the coded output stream, and also defines a codec clock to maintain Synchronized time model. At the same time, the standard also defines a program reference clock (PCR) value in the code stream to mark the system clock of the program code stream, but the standard stipulates that the processing of the code stream, such as demultiplexing, re-multiplexing and bit rate During the change processing, the PCR value of the time information parameter of the code stream must be strictly corrected according to the standard re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L7/00H04N5/04H04N7/24
Inventor 罗传飞周军王兴东熊红凯孙军
Owner SHANGHAI JIAO TONG UNIV