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Adjacent channel interference elimination device and method

An adjacent channel interference and adjacent channel technology, which is applied in the field of adjacent channel interference elimination devices, can solve the problems of good elimination effect, poor elimination effect and high complexity, and achieves good cost advantages, simple structure, and the effect of overcoming adjacent channel interference.

Active Publication Date: 2010-09-22
ZHANGJIAGANG KANGDE XIN OPTRONICS MATERIAL
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AI Technical Summary

Problems solved by technology

[0008] The problem solved by the present invention is the problem of simple structure but poor elimination effect or good elimination effect but high complexity in eliminating adjacent channel interference of television signals in the prior art

Method used

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  • Adjacent channel interference elimination device and method
  • Adjacent channel interference elimination device and method
  • Adjacent channel interference elimination device and method

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Embodiment Construction

[0023] The inventors found that in the transmission process of television signals, in order to suppress the interference of adjacent channels, a set of circuits must be designed inside the receiver to filter useful signals. However, in traditional filtering techniques, either the center position and bandwidth are fixed Unchanging filters make the applicability weaker and lead to poor filtering performance, or due to the use of multi-rate signal processing technology or filters with adjustable coefficients, the amount of calculation is huge, which increases the complexity of the equipment and increases the cost.

[0024] The inventor of the present invention envisages: using the spectral characteristics of the television signal, the frequency spectrum of the signal is shifted to the stop band position of the filter through a certain frequency shifting process, and the filter of the television signal with simple structure and fixed filter coefficient is used Adjacent channel sign...

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Abstract

The invention relates to an adjacent channel interference elimination device and a method thereof for transmitting television signals, wherein the adjacent channel interference elimination device comprises a power detection unit, an interference elimination unit, a frequency shifter and a filter, wherein the power detection unit is used for detecting power of the television signals and judging whether adjacent channel signals cause strong adjacent channel interference on useful signals or not; the interference elimination unit comprises a frequency shifter and a filter; the frequency shifter is used for shifting the frequency of the television signals according to the power bandwidth of the filter when the power detection unit detects the adjacent channel signals which cause strong adjacent channel interference and for moving the adjacent channel signals which cause strong adjacent channel interference in the television signals to a stop band position beyond the power bandwidth of the filter; and the filter is used for filtering the adjacent channel signals at the stop band position according to frequency shifting results. The adjacent channel interference elimination device and the method thereof provided by the invention can eliminate the adjacent channel interference effectively with simple structure and lower computation complexity, and therefore, a receiver can obtain good-quality television signals.

Description

technical field [0001] The invention relates to data packet recovery technology, in particular to an adjacent channel interference elimination device and an adjacent channel interference elimination method applied to television signals. Background technique [0002] At present, countries all over the world are facing a transformation from analog TV to digital TV. Like the evolution process of all analog technologies outside the communication field to digital technology, driven by user needs and scientific and technological progress, digital TV technology is becoming more and more mature, and digital TV is constantly providing people with higher quality, more functions, and more personalized At the same time, it has gradually become the mainstream of the TV broadcasting system. [0003] At present, all countries and regions around the world have proposed their own digital television broadcasting standards accordingly, such as the Digital Video Broadcasting (DVB, Digital Vide...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/21
Inventor 刘义臣
Owner ZHANGJIAGANG KANGDE XIN OPTRONICS MATERIAL
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