Terrestrial digital television system

A terrestrial digital TV, local technology, applied in the parts of the TV system, TV, color TV and other directions, can solve the problems of information culture security cannot be effectively guaranteed, the front-end investment is expensive, etc., to reduce the front-end investment cost, increase space, Search for quick results

Active Publication Date: 2008-10-15
SICHUAN JINWANGTONG ELECTRONICS SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention aims at proposing an...

Method used

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  • Terrestrial digital television system
  • Terrestrial digital television system
  • Terrestrial digital television system

Examples

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Embodiment 1

[0023] as attached figure 2 As shown, when the radio and television front-end adopts the digital microwave signal modulated by QPSK, because the satellite signal is also modulated by QPSK, the set-top box 204 adopts a single TUNER structure. The switching switch 205 is used to switch between the local QPSK modulated microwave signal 113 and the satellite signal 114, and finally send the legal signal to the TV 112 for playback.

Embodiment 2

[0025] Such as image 3 As shown, when the radio and television front-end adopts the transmission of digital signals modulated by QAM, the receiving terminal of the set-top box 304 has a double TUNER 302 and 303 structure, and 303 is an S-TUNER for receiving satellite signals and QPSK demodulation. 302 is a C-TUNER, which is used to demodulate the QAM modulated signal 301, and finally send the legal signal to the TV 112 for playback.

Embodiment 3

[0027] Such as Figure 4 As shown, when the front end adopts the digital signal conforming to my country's digital TV terrestrial transmission standard (the standard number is GB 20600-2006) or the European digital TV terrestrial transmission standard, the set-top box has a dual TUNER402 and 403 structure, and 403 is S-TUNER for Demodulate satellite signal; 402 is T-TUNER, which is used to demodulate terrestrial wireless signal 113 from radio and television transmission, and finally send legal signal to TV 112 for playback.

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Abstract

The invention relates to a ground digital television system. A front end operates matching software by a server, and all the parameter information of the locally-run programs and satellite programs which users are allowed to watch are made into a super NIT form that resembles the format of an NIT standard form, and the super NIT form is multiplexing-transmitted together with a locally-run program TS stream; a receiving terminal adopts a set top box which is matched with the front end and modulated by a TUNER to demodulate local program signals and satellite program signals respectively. After being started and initialized, the set top box automatically checks whether the NIT form is updated. The central frequency point where the super NIT form of the local program signal is located is searched, and the super NIT information form is analyzed, then program information is stored at a fixed position of the terminal of the set top box, after demodulation and audio-and-video processing, AV signals are output to a TV set to be played normally. The system greatly reduces the investment cost of the front-end equipment, improves the utilization rate of the existing front ends and ensures the security of the program signals of the users.

Description

Technical field: [0001] The invention relates to a terrestrial digital television system. Background technique: [0002] In recent years, with the vigorous promotion and popularization of digital TV, digital TV has been widely used in thousands of households. The current programs transmitted by terrestrial digital TV include local self-run programs and satellite programs. Users can install satellite receiving equipment to directly receive satellite programs, but some existing satellite programs are not allowed to be watched by users from the perspective of national security. Through the front end, the programs that the user can watch are first received and screened out, and then transmitted to the user. [0003] The existing terrestrial digital TV front-end construction mode is usually: the digital TV front-end processes and transmits local self-managed programs and satellite programs at the same time, several sets of programs are multiplexed by a multiplexer, scrambled by...

Claims

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Application Information

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IPC IPC(8): H04N7/52H04N5/44H04N5/00H04N7/173H04N7/045H04N7/20H04N21/236H04N21/434H04N21/60
Inventor 刘海润陈文英
Owner SICHUAN JINWANGTONG ELECTRONICS SCI & TECH
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