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A video surveillance system

A video surveillance system and video signal technology, which is applied in the direction of closed-circuit television systems, etc., can solve the problems of high chip price and high application cost of coaxial power supply technology

Active Publication Date: 2020-06-19
HANGZHOU HIKVISION DIGITAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] It should be pointed out that the transmission of video signals through coaxial cables requires the use of dedicated modulation chips and demodulation chips, and the prices of these chips are often high. Correspondingly, the application cost of the existing coaxial power supply technology will also be high
In addition, limited by the dedicated modulation chip and demodulation chip, the existing coaxial power supply technology is only suitable for the transmission of video signals with a frequency of 0-6MHZ between the front-end equipment and the back-end equipment

Method used

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Embodiment Construction

[0019] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0020] In order to solve the problems existing in the prior art, an embodiment of the present invention provides a video surveillance system.

[0021] see figure 1 , which shows a schematic structural diagram of a video surveillance system provided by an embodiment of the present invention. Such as figure 1 As shown, the video surveillance system includes: front-end equipment and back-end equipment. Specifically, the back-end device can be a hard disk video...

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Abstract

An embodiment of the invention provides a video monitoring system, which comprises a front-end device and a back-end device. The front-end device comprises a first high-pass filtering circuit and a first low-pass filtering circuit, the first high-pass filtering circuit allows video signals with the frequency of HZ level and above to pass through and isolates DC signals, and the first low-pass filtering circuit allows DC signals to pass through and isolates video signals. A video signal output port of the front-end device is connected with a coaxial cable by means of the first high-pass filtering circuit, and the coaxial cable is connected with a power supply input port of the front-end device by means of the first low-pass filtering circuit. The back-end device comprises a second high-passfiltering circuit and a second low-pass filtering circuit, the second high-pass filtering circuit allows video signals to pass through and isolates DC signals, and the second low-pass filtering circuit allows DC signals to pass through and isolates video signals. A power supply output port of the back-end device is connected with the coaxial cable by means of the second low-pass filtering circuit, and the coaxial cable is connected with a video signal input port of the back-end device by means of the second high-pass filtering circuit. The video monitoring system can reduce the application cost of the coaxial power supply technology, and expands the frequency range of the video signals to which the coaxial power supply technology is applicable.

Description

technical field [0001] The invention relates to the technical field of video monitoring, in particular to a video monitoring system. Background technique [0002] With the rapid development of video surveillance technology, coaxial power supply technology is more and more widely used in video surveillance systems. Generally speaking, a video surveillance system includes: a front-end device and a back-end device, and the front-end device is connected to the back-end device through a coaxial cable. Coaxial power supply technology refers to the technology of simultaneously transmitting DC power signals and video signals between front-end equipment and back-end equipment through coaxial cables. When using the existing coaxial power supply technology, the specific process of transmitting video signals through coaxial cables is: the front-end equipment uses a dedicated modulation chip to modulate the video signal to a higher frequency, and then couples the modulated video signal ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N7/18
CPCH04N7/18
Inventor 闫云鹏
Owner HANGZHOU HIKVISION DIGITAL TECH
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