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Digital TV-set signalling comprehensive analyzer

A digital TV signal and comprehensive analysis technology, applied in TV, electrical components, image communication, etc., can solve the problems of high technical difficulty and long development cycle, and achieve the effects of good index consistency, simple function development, and simple production and debugging

Inactive Publication Date: 2009-07-08
TIANJIN DEVISER ELECTRIC INSTR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage of this solution is that the technology is very difficult and the development cycle is long

Method used

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  • Digital TV-set signalling comprehensive analyzer
  • Digital TV-set signalling comprehensive analyzer

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Embodiment 1

[0019] Embodiments of the present invention are described below with reference to the accompanying drawings, figure 1 It is a schematic block diagram of the system circuit hardware and software, figure 2 is the modulation domain analysis model.

[0020] The technical solution of the hardware platform adopts the traditional superheterodyne receiver plus digital processing. like Figure 1 As shown, it is divided into three parts: broadband superheterodyne receiving part, high-speed data sampling part and DSP and embedded processing part.

[0021] The high-speed data sampling part adopts a pipelined 50MSPS ADC circuit with 14BIT quantization bits, which can process broadband signals and has large dynamics. At the same time, the sampling circuit has a large-capacity sampling storage depth of 8M bytes, which provides a basis for demodulation and analysis of various standard signals.

[0022] In order to adapt to large dynamic and high-speed signal processing, the DSP and embedd...

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Abstract

The invention relates to the field of digital television, in particular to a digital television signal comprehensive analyzer. The invention adopts the software radio (SDR) theory to demodulate the digital TV signal to analyze the modulation domain. The principle is to abstract the physical theory of digital TV demodulation into a set of mathematical algorithms, and then implement the algorithm to demodulate digital TV radio frequency signals through software (combination of hard logic and soft logic); extract the intermediate variables in the demodulation process, Get the data required for testing, such as constellation information, MER / EVM information and BER information. The invention has the advantages of strong function, good index consistency, simple production and debugging, and simple secondary function development, which only needs to establish an algorithm mathematical model and realize software.

Description

technical field [0001] The invention relates to the field of digital television, in particular to a digital television signal comprehensive analyzer. Background technique [0002] With the continuous update and maturity of technology, digital TV is becoming more and more popular, and the strength of digital TV signal is the key to the effect of digital TV, so the detection of digital TV signal becomes a key technology, digital TV signal Comprehensive analyzer came into being. Digital TV signal comprehensive analyzer (DVB-C analyzer) has modulation domain analysis (including constellation diagram test and analysis, modulation error rate (MER) / vector magnitude error (EVM), bit error rate (BER) test before and after R-S decoding ), code domain analysis and frequency domain analysis functions (channel power test, carrier-to-noise ratio test (C / N), spurious output suppression ratio, frequency accuracy test and phase noise analysis function). [0003] There are currently two tec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N17/02
Inventor 曹玉良
Owner TIANJIN DEVISER ELECTRIC INSTR
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