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Method and system for system detection under weak signal

A detection method and detection system technology, applied in the direction of image communication, television, electrical components, etc., can solve problems such as interference, failure, and affecting the accuracy of color burst signal judgment, and achieve the effect of increasing accuracy and increasing strength

Active Publication Date: 2012-07-18
ARKMICRO TECH
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Problems solved by technology

[0005] However, there is a problem in the judgment of the PAL system based on the above principles. When the signal is very weak, due to the existence of interference, it will affect the accuracy of the color burst signal judgment, or even fail

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  • Method and system for system detection under weak signal
  • Method and system for system detection under weak signal

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Embodiment Construction

[0046] The specific implementation manners of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0047] First, briefly introduce the professional background knowledge related to the present invention.

[0048] Color burst signal area: CVBS signal is composed of image signal, composite blanking signal and composite sync signal. The color burst signal is on the back shoulder of the line blanking pulse after the line synchronization signal. It is a section with the same frequency as the color subcarrier at the sending end and maintains a definite phase relationship with it (9±1 color subcarrier cycle), etc. Amplitude wave. The color burst signal area is the area of ​​the 9±1 color subcarrier periods.

[0049] Such as figure 2 Shown is the flow chart of the PAL system detection method under the weak signal situation in the embodiment of the present invention, when the input signal is relatively weak, then adopt as follows ...

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Abstract

The embodiment of the invention discloses a method for system detection under a weak signal, which comprises the following steps of: inputting video signals line by line; setting adjacent M lines of video signals as one group, and setting each adjacent continuous N group of signals to be participated in one-time accumulation; setting a window in a color sync signal zone of each line of video signals; in each window zone, accumulating corresponding lines of each adjacent continuous N group of signals to obtain enhanced line-by-line video signals; and carrying out system judgment through adopting the enhanced line-by-line video signals. The embodiment of the invention also discloses a system for system detection under the weak signal, which comprises a signal input unit, a parameter confirming unit, a window setting unit, an accumulation unit, and a system judging unit. According to the technical scheme of the invention, through analysis of phase positions and frequency characteristics of color sync signals of a PAL (Programmable Array Logic) system and an NTSC (National Television System Committee) system, and the adoption of an accumulation method, the accuracy of detection of the PAL system and NTSC system is effectively improved.

Description

technical field [0001] The invention relates to the field of video signal standard detection, in particular to a method and system for standard detection when the video signal is weak. Background technique [0002] Traditional video signals are divided into several formats: NTSC / PAL / SECAM, and each format is divided into several subcategories. In the full-standard decoding chip, these types of standards need to be automatically identified. When the system is judged incorrectly, image color errors, and line and field instability will occur. Therefore, the accuracy of standard detection will affect the performance of the decoding chip. [0003] Such as figure 1 Shown are the various characteristics of all the current systems. Among them, the SECAM system has two color subcarrier frequencies, while the PAL system and NTSC system have a single fixed color subcarrier frequency. Therefore, the general SECAM system is easier to integrate with the PAL system. The NTSC system is di...

Claims

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Application Information

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IPC IPC(8): H04N17/00
Inventor 李琛石岭李汉光
Owner ARKMICRO TECH
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