Analog video signal format determination system and method and related devices

A technology of video signal and analog video, applied in CCTV system, TV system scanning details, etc., can solve the problems of complex operation, no image, blurry screen, etc., to achieve the effect of improving compatibility and simplifying the matching process

Active Publication Date: 2014-04-09
ZHEJIANG DAHUA TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the sending chip at the end of the existing video signal acquisition device (for example, an analog camera) cannot obtain the video signal format type supported by the receiving device, it is impossible to know whether the receiving device supports the 1280H high-definition analog video signal format. If the video signal acquisition device Use 1280H high-definition analog video signal format to transmit the collected analog video signal, but the receiving device at the back end does not support high-definition analog video signal decoding technology, there will be abnormal situations such as no image, blurred screen, etc.
[0005] In order to solve the above problems, in the prior art, manual matching is usually used to match the format type of the analog video signal transmitted by the front-end video signal acquisition device. This process is not only complicated to operate, but also reduces the compatibility of the video signal receiving device. sex

Method used

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  • Analog video signal format determination system and method and related devices
  • Analog video signal format determination system and method and related devices
  • Analog video signal format determination system and method and related devices

Examples

Experimental program
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Embodiment 1

[0029] According to the characteristics of SD analog video signal and HD analog video signal in the frequency domain, using the method of detecting higher frequency signals, it can judge whether the back-end video signal receiving device supports HD analog video signal, and select the output analog video signal according to the judgment result format. The frequency domain range of standard definition analog video signal is 0~6MHz, and the frequency range of high definition analog video signal is 0~20MHz, therefore, you can choose a frequency value f c The carrier signal much larger than 20MHZ, under the premise of not affecting the transmission of standard definition analog video signal or high definition analog video signal, is used as the detected carrier frequency value, where, f c The range of values ​​of can be F≥N+1, where F represents a predetermined frequency, and N represents an upper limit frequency of an analog video signal. Preferably, f c The value range of can ...

Embodiment 2

[0037] During specific implementation, since high-definition video signals include high-resolution high-definition video signals (such as high-definition video signals with a resolution of 1080P) and low-resolution high-definition video signals (such as high-definition video signals with a resolution of 720P), if the video signal The receiving device supports high-resolution high-definition video signals, and it can output high-resolution or low-resolution high-definition video signals to it. However, if the video signal receiving device supports low-resolution high-definition video signals, it can output high-resolution video signals to it. The high-definition video signal with a higher rate will cause the video signal receiving device to fail to decode and cause display errors.

[0038] Based on this, in this embodiment of the present invention, the predetermined frequency may include, but is not limited to, a first predetermined frequency and a second predetermined frequency...

Embodiment 3

[0044] Such as image 3 As shown, it is a schematic structural diagram of a video signal receiving device provided by an embodiment of the present invention, including:

[0045] The signal generator 2021 is configured to generate a carrier signal of a predetermined frequency, and output the generated carrier signal of a predetermined frequency to the video signal acquisition device.

[0046] During specific implementation, the video signal receiving device 202 and the video signal collecting device 201 are connected through a transmission cable, and the signal generator 2021 outputs the generated carrier signal of a predetermined frequency to the video signal collecting device through the transmission cable between the two. device 201.

[0047] During specific implementation, the video signal receiving device 202 may also include a low-pass filter 2022 and an analog video signal receiving module 2023, wherein the low-pass filter 2022 may be used to extract the high-definition...

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PUM

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Abstract

The invention discloses an analog video signal format determination system and method and related devices, which are used for simplifying the matching process of analog video signal format types and improving the compatibility of a receiving device. The analog video signal format determination system comprises a video signal acquisition device and a plurality of video signal receiving devices, wherein each video signal receiving device is used for generating carrier signals with scheduled frequency when having a high-definition analog video signal decoding capacity, and each video signal receiving device is also used for outputting the carrier signals with the scheduled frequency to the video signal acquisition device; and the video signal acquisition device is used for determining whether to receive the carrier signals with the scheduled frequency sent by the video signal receiving devices; and the video signal acquisition device is also used for determining whether the video signal receiving devices support the high-definition analog video signal format when receiving the carrier signals with the scheduled frequency sent by the video signal receiving devices, otherwise, the video signal acquisition device determines that the video signal receiving devices do not support the high-definition analog video signal format.

Description

technical field [0001] The invention relates to the technical field of video surveillance, in particular to a system, method and related equipment for determining the format of an analog video signal. Background technique [0002] In the technical field of video surveillance, a video surveillance system usually includes a front-end video signal acquisition device and a rear-end video signal receiving device. After the video signal acquisition device collects the video signal, after encoding and compression processing, the video signal is transmitted to the video signal receiving device, and the video signal receiving device decodes and decompresses the received video signal for display. [0003] Among them, video signal receiving equipment includes hard disk recorders, network video encoders, optical transceivers, etc. For traditional CVBS analog video signals, the video analog-to-digital conversion chips used by these devices can Determine the format of the analog video si...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/46H04N7/18
Inventor 殷俊张兴明傅利泉朱江明吴军吴坚
Owner ZHEJIANG DAHUA TECH CO LTD
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