KR20140115057A - Closed-circuit television system for transferring compressed, high-resolution digital video signal through coaxial cable - Google Patents
Closed-circuit television system for transferring compressed, high-resolution digital video signal through coaxial cable Download PDFInfo
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- KR20140115057A KR20140115057A KR1020130029648A KR20130029648A KR20140115057A KR 20140115057 A KR20140115057 A KR 20140115057A KR 1020130029648 A KR1020130029648 A KR 1020130029648A KR 20130029648 A KR20130029648 A KR 20130029648A KR 20140115057 A KR20140115057 A KR 20140115057A
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- South Korea
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- video signal
- digital video
- signal
- coaxial cable
- baseband
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B11/00—Communication cables or conductors
- H01B11/18—Coaxial cables; Analogous cables having more than one inner conductor within a common outer conductor
- H01B11/1895—Particular features or applications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/76—Television signal recording
- H04N5/91—Television signal processing therefor
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/015—High-definition television systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/18—Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
Abstract
A closed circuit television system capable of transmitting a high-resolution digital video signal compressed through a coaxial cable according to the present invention is a closed circuit television system including an IP camera and a network video recorder (NVR) connected via a coaxial cable, Includes a camera processor for receiving an image sensor from an image sensor and generating a plurality of video signals including a baseband signal and a digital video signal and a processor for receiving the baseband video signal and the digital video signal as an output signal for transmission over a coaxial cable An encoder that generates and combines the baseband video signal and the digital video signal with an output signal having a different frequency signal band using frequency division multiplexing, and a decoder configured to demodulate the upstream signal received from the coaxial cable Yes, yes. The work video recorder (NVR) separates the baseband video signal and the digital video signal included in the output signal by frequency to remove distortion from the digital video signal and outputs the attenuation of the baseband video signal And a host processor for receiving the digital video signal from the modem and storing the digital video signal in a storage unit, providing the digital video signal to the digital video decoder, and providing the upstream data to the modem.
Description
The present invention relates to a closed circuit television (CCTV) system, and more particularly, to a system and method for transmitting a high resolution digital video signal compressed through a coaxial cable to provide analog video or high resolution digital video to a monitor screen in a network video recorder Lt; RTI ID = 0.0 > a < / RTI > closed-circuit television system.
In Korean Patent No. 10-1000393 (hereinafter, referred to as the prior art), a control program for controlling camera control and video display is installed in a server connected to a closed circuit television (CCTV) system, And a CCTV system in which a local user can access a server through his / her terminal (i.e., a personal computer) and control the CCTV.
The prior art is a technology focused on remote control of the camera rather than a technique for improving the resolution of the video signal photographed by the camera. Therefore, even if the camera remote control is convenient, the surveillance efficiency is deteriorated if the monitor sees a low resolution image.
Currently, closed-circuit television (CCTV) systems have improved screen resolution and transmission methods, depending on the capabilities of cameras and communications equipment. First, a conventional analog camera uses a coaxial cable to generate and output a CVBS (composite video baseband signal) signal that can be transmitted up to 300 meters. Second, digital cameras support a high-definition serial digital interface (HD-SDI) that can be used to transmit uncompressed high-definition digital video over coaxial cable at a 1.5Gbps rate. Cable distances that can be supported under these high transmission rates are up to 100 meters to be. Third, IP-based high-definition cameras transmit compressed high-definition digital video.
A closed-circuit television (CCTV) system supporting a high-definition serial digital interface (HD-SDI) using a digital camera is referred to as an HD-SDI CCTV system and a closed-circuit television (CCTV) system using an IP- It is called CCTV system. Currently, HD CCTV systems in the industry are collectively referred to as HD-SDI CCTV systems and HD-IP CCTV systems.
HD CCTV systems have many advantages, but they also have disadvantages. For example, the HD-SDI CCTV system has a short transmission distance of 100 meters through a coaxial cable, a limited maximum resolution, and only one-way communication. Since HD-IP CCTV system requires twisted pair cable instead of coaxial cable, new line construction is required and supplementary materials such as HUB / ROUTER are needed by using 100Mbps Ethernet and user retraining is needed.
However, in order to increase the efficiency of surveillance and security through high-resolution video, it is urgent to use HD CCTV system. Therefore, there is a need for a new closed circuit television (CCTV) system that can overcome all the shortcomings of existing HD CCTV systems.
Disclosure of the Invention The present invention has been made to solve the above problems, and it is an object of the present invention to provide a high-resolution digital video signal compressed to a maximum of 500 meters through a coaxial cable to transmit an analog video or high- And more particularly to a closed-circuit television system capable of providing a closed-circuit television system.
Another object of the present invention is to provide a method and apparatus for reducing the cost required to replace an analog CCTV system or an HD-SDI CCTV system using a conventional coaxial cable with a HD-IP CCTV system, It is an object of the present invention to provide a closed circuit television system capable of transmitting a high-resolution digital video signal.
It is still another object of the present invention to provide a coaxial cable which can replace an analog CCTV system or an HD-SDI CCTV system using an existing coaxial cable with an HD-IP CCTV system, It is an object of the present invention to provide a closed circuit television system capable of transmitting a high-resolution digital video signal compressed through a cable.
According to an aspect of the present invention, there is provided a closed-circuit television system capable of transmitting a high-resolution digital video signal compressed through a coaxial cable, including: an IP camera; a network video recorder (NVR) The IP camera comprising: a camera processor for receiving an image sensor from an image sensor and generating a plurality of video signals including a baseband signal and a digital video signal; An encoder for generating an output signal for transmission over a coaxial cable of a digital video signal, the output signal having a different frequency signal band for the baseband video signal and the digital video signal using frequency division multiplexing, , And the coaxial cable A decoder configured to demodulate a signal received from the upstream, and
The network video recorder (NVR) separates the baseband video signal and the digital video signal included in the output signal by frequency, removes distortion from the digital video signal when the output signal is input, A modem for receiving and decoding the digital video signal from the modem and for providing the digital video signal to the digital video decoder and for providing upstream data to the modem, .
According to the above configuration, a closed circuit television system capable of transmitting a high-resolution digital video signal compressed through a coaxial cable according to the present invention has the following advantages.
First, existing coaxial cables and associated equipment can be reused. In other words, it is possible to reduce the cost of replacing the analog CCTV system or HD-SDI CCTV system using the existing coaxial cable with the HD-IP CCTV system, and to minimize the disconnection of the surveillance system when the system is replaced.
Second, even if replacing the analog CCTV system or the HD-SDI CCTV system using the existing coaxial cable with the HD-IP CCTV system, it is possible to eliminate the inconvenience of re-training the user without the need of constructing a new line.
1 shows a closed circuit television system capable of transmitting high resolution digital video signals compressed through a coaxial cable according to the present invention.
2 shows a configuration of an IP camera according to the present invention.
3 is an exemplary diagram for explaining a signal frequency band corresponding to a plurality of video signals output from the IP camera of FIG.
4 shows a configuration of a network video recorder (NVR) according to the present invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the like elements throughout.
As shown in FIG. 1, a closed circuit television system capable of transmitting a high-resolution digital video signal compressed through a coaxial cable according to the present invention includes an IP camera 100 and a network video recorder 200 connected through a coaxial cable 200, (NVR) < / RTI >
FIG. 2 illustrates a configuration of an IP camera according to the present invention, and FIG. 3 illustrates an exemplary signal frequency band corresponding to a plurality of video signals output from the IP camera of FIG.
2, the IP camera 100 includes an
The
The signal frequency band corresponding to the plurality of video signals output from the IP camera 100 is divided as shown in Fig. The CVBS (composite video baseband signal) signal uses SD analog video up to 5MHz band and the downstream has 8MHz bandwidth around 18.75MHz and transmits HD IP video data at a transmission rate of 36Mbps. Upstream has a 2.5MHz bandwidth around 39MHz and transmits data such as camera control signals at a transmission rate of up to 11Mbps.
4, the network video recorder (NVR) 300 according to the present invention, when an output signal is input from the IP camera 100, outputs a baseband video signal and a digital video signal included in the output signal to a
The network video recorder (NVR) 300 according to the present invention can be implemented by including an
While the invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiments, It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the scope of the present invention. Accordingly, the true scope of the present invention should be determined only by the appended claims.
Claims (1)
Wherein the IP camera comprises:
A camera processor for receiving an image sensor from an image sensor and generating a plurality of video signals including a baseband signal and a digital video signal;
Generating an output signal for transmission over the coaxial cable of the baseband video signal and the digital video signal, wherein the baseband video signal and the digital video signal are frequency-division multiplexed using an output signal having a different frequency signal band, An encoder that generates and combines the signals; And
And a decoder configured to demodulate the upstream signal received from the coaxial cable,
Wherein the network video recorder (NVR)
And a demodulator for demultiplexing the baseband video signal and the digital video signal included in the output signal by frequency to remove distortion from the digital video signal and compensating for attenuation of the baseband video signal, Modem; And
A host processor for receiving a digital video signal from the modem and storing the digital video signal in a storage unit, providing the digital video signal to a digital video decoder, and providing upstream data to the modem;
Wherein the high-resolution digital video signal is transmitted through a coaxial cable.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020130029648A KR20140115057A (en) | 2013-03-20 | 2013-03-20 | Closed-circuit television system for transferring compressed, high-resolution digital video signal through coaxial cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020130029648A KR20140115057A (en) | 2013-03-20 | 2013-03-20 | Closed-circuit television system for transferring compressed, high-resolution digital video signal through coaxial cable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| KR20140115057A true KR20140115057A (en) | 2014-09-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR1020130029648A KR20140115057A (en) | 2013-03-20 | 2013-03-20 | Closed-circuit television system for transferring compressed, high-resolution digital video signal through coaxial cable |
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| KR (1) | KR20140115057A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102224728B1 (en) * | 2020-01-21 | 2021-03-05 | 이현우 | Apparatus and method for transmitting and receiving ip image data using coaxial cable |
| CN112821155A (en) * | 2021-01-05 | 2021-05-18 | 一汽解放汽车有限公司 | Spiral cable and get rid of and hang transport vechicle |
| CN113329200A (en) * | 2021-06-07 | 2021-08-31 | 广州市奥威亚电子科技有限公司 | Clock synchronization data transmission device based on coaxial cable |
-
2013
- 2013-03-20 KR KR1020130029648A patent/KR20140115057A/en not_active Application Discontinuation
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102224728B1 (en) * | 2020-01-21 | 2021-03-05 | 이현우 | Apparatus and method for transmitting and receiving ip image data using coaxial cable |
| CN112821155A (en) * | 2021-01-05 | 2021-05-18 | 一汽解放汽车有限公司 | Spiral cable and get rid of and hang transport vechicle |
| CN112821155B (en) * | 2021-01-05 | 2022-12-30 | 一汽解放汽车有限公司 | Spiral cable and get rid of and hang transport vechicle |
| CN113329200A (en) * | 2021-06-07 | 2021-08-31 | 广州市奥威亚电子科技有限公司 | Clock synchronization data transmission device based on coaxial cable |
| CN113329200B (en) * | 2021-06-07 | 2024-03-15 | 广州市奥威亚电子科技有限公司 | Clock synchronous data transmission device based on coaxial cable |
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