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Method for building digital TV network

A digital TV and network building technology, applied in the field of electronic technology, can solve the problems of easy intrusion, signal transmission error, transmission error code, etc., and achieve the effect of fast and effective maintenance and super long working time

Inactive Publication Date: 2006-04-19
TIANJIN DEVISER ELECTRIC INSTR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the uplink frequency band, various interferences are very easy to invade, causing transmission errors, and even causing signal transmission errors

Method used

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  • Method for building digital TV network
  • Method for building digital TV network
  • Method for building digital TV network

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] This embodiment includes the following equipment:

[0050] a. Digital signal measuring instruments are selected for the signal test of the front-end computer room of the TV station:

[0051] (1) Digital spectrum analyzer, suitable for QAM and QPSK digital signal measurement of various bandwidths, equipped with two professional analysis tools of cable TV analysis and digital signal analysis, providing CSO / CTB, C / N, HUM, TILT, MOD, Key digital signal indicators such as LEVEL, modulation degree, audio deviation, digital power measurement and QAM / QPSK modulation constellation diagram, MER (modulation bit error rate), EVM (vector error), PRO / POSTBER (bit error rate), etc. It is a comprehensive and reliable measurement and analysis instrument in digital TV engineering, which can quickly and effectively maintain key services such as CableModem and DTV;

[0052] (2) DVB comprehensive analyzer;

[0053] (3) Digital TV DVB tester, in addition to all the functions of analog TV, al...

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PUM

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Abstract

Change of C / N, CSO / CTB indexes at any key connection point such as machine room, trunk amplifier, storied house amplifier etc. will affect stable transmission of QAM signal, causing index deterioration of PRO / POST BER, EVM, MER etc. When user receives signal, the said deteriorated index will induce mosaic phenomena, even up going interactive service is interrupted. The invention can measure transmission quality of QAM modulation signal effectively in complex network environment for digital cable TV.

Description

technical field [0001] The invention relates to the application of electronic technology, in particular to a method for establishing a digital TV network. Background technique [0002] Hybrid Fiber / Coax (HFC) Networks [0003] As the main signal transmission mode of the cable TV system, the hybrid fiber / coaxial cable (HFC) network has driven the transformation from analog TV to digital cable TV with its rapid development. The "high speed" performance not only enables the cable TV network to extend to the actual user's home, but also has unique functions that cannot be replaced by other networks. The emergence of the HFC network not only improves the quantity and quality of the TV programs transmitted by the cable TV station, but also the service content exceeds the simple TV program broadcasting, and various value-added services also appear in the cable TV network. Therefore, "one network with multiple functions" has become the guiding ideology for the development of cable...

Claims

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Application Information

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IPC IPC(8): H04L12/28H04N7/22
Inventor 曹玉良
Owner TIANJIN DEVISER ELECTRIC INSTR