Method for automatically modifying central frequency point of set top box

A center frequency, set-top box technology, applied in the field of automatically modifying the center frequency of the set-top box, can solve the problem of not being able to update automatically, and achieve the effect of reducing operation and maintenance costs, convenient operation and maintenance, and high efficiency

Inactive Publication Date: 2014-12-10
SICHUAN JINWANGTONG ELECTRONICS SCI & TECH
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Problems solved by technology

But because the previous center frequency point is fixed by software and cannot be updated automatically, it must be realized by modifying the software and re-upgrading the network

Method used

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  • Method for automatically modifying central frequency point of set top box
  • Method for automatically modifying central frequency point of set top box

Examples

Experimental program
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Embodiment

[0017] Example: see figure 1 , A method for automatically modifying the center frequency of the set-top box, the method is as follows, insert a private descriptor in the first loop of the front-end code stream NIT table, the private descriptor is the NIT_DES_TAG descriptor, such as:

[0018]

[0019] To analyze the NIT table, the set-top box first obtains the data of the entire NIT table from the front end, and then finds the private descriptor from the NIT table data according to the description specification, and parses the frequency parameters, symbol rate parameters, and modulation parameters of the new frequency point respectively, and replaces the new The parameters of the frequency point are stored in the FLASH area corresponding to the set-top box, and NIT search, air upgrade, and advertisement reception can be realized normally.

[0020] After the set-top box is turned on, it will monitor the frequency information described in NIT_DES_TAG in the NIT table in real time;

[0...

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Abstract

The invention discloses a method for automatically modifying central frequency point of a set top box. The method includes step 1, inserting a private descriptor during first circulation of a front-end code stream NIT (network information table); step 2, analyzing the NIT, namely acquiring data of the whole NIT from a front end by the set top box, finding the private descriptor in the data of the NIT according to description standards, respectively analyzing frequency parameters, symbol rate parameters and modulation mode parameters, and storing parameters of new frequency point into a FLASH area corresponding to the set top box. Compared with the prior art, the method has the advantages that a front-end system is enabled to broadcast configuration files containing central frequency point description tables in real time at any frequency point, and when broadcasting front-end central frequency point is changed, value of the central frequency point of the configuration file of a central frequency point descriptor of code stream broadcast in real time is changed. The set top box monitors the central frequency point value in real time, and once changes are caused, a new frequency point is set to be the central frequency point, so that automatic modifying of the central frequency point is realized.

Description

Technical field [0001] The invention relates to the field of set-top boxes, in particular to a method for automatically modifying the central frequency point of the set-top box. Background technique [0002] With the strengthening of the overall national digital TV conversion and translation efforts, all provinces, municipalities and all levels of radio and television departments have built their own front-end systems. However, due to the limited frequency resources of digital TV, the total effective frequency range is 115-858MHZ, which will inevitably cause the frequency of many radio and television front ends to be repeated, including the center frequency. Especially adjacent areas will cause co-frequency interference at the center frequency point, which will eventually affect the viewing of programs. [0003] The central frequency point is a special frequency point designated by the radio and television front end, and its function is: [0004] 1. Send the NIT table to describe a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N21/443
Inventor 范春祥
Owner SICHUAN JINWANGTONG ELECTRONICS SCI & TECH
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