KR20040086932A - The Input/Output interface Design Method using I2C Bus in a PC based DVR System - Google Patents

Abstract

PURPOSE: A method for designing an input/output interface of a DVR system under PC environment where an I2C bus is used is provided to expand an I2C bus out of a board, and to replace an interface between DI/DO panel boards and control panel boards with the I2C bus, thereby removing an additional cost. CONSTITUTION: When an analog video signal is transmitted to a 16-channel video capture board(20) mounted on a PC main board(10) via a BNC panel board(40) corresponding to a back panel, the video capture board(20) converts the inputted analog video signal into a digital video signal. A CPU mounted on the PC main board(10) displays videos photographed in real time from a PC environmental DVR system on a monitor having divided screens of plural channels or one screen of a specific channel. The DVR system compresses the digital video signal having high image quality to store the compressed signal in a hard disk of a hard disk drive(30).

Description

The Input / Output interface Design Method using I2C Bus in a PC based DVR System}

The present invention relates to an input / output interface design method of a PC environment DVR system using an I2C bus, which is an interface standard bus between chips in a PCB board of a PC environment DVR system, and more particularly, to capture an image necessary for a conventional DVR system. By expanding the I2C bus used in the board out of the board, replacing the interface between the external I / O board DI / DO panel board and control panel board with the I2C bus to design additional serial interface or dedicated PCI board mainly in the existing PC environment DVR system. By providing an interface design technology that does not incur additional costs compared to the existing I / O interface design method that was in charge of I / O, the I / C interface design method of the PC environment DVR system using I2C bus can reduce the interface design cost and increase the stability of operation. It is about.

In general, the PC environment DVR system captures the video signal (analog signal) input from CCTV on the image capture board and converts it into high quality digital signal on the computer hard disk. Recording and retrieval function, monitoring function to divide and monitor multiple camera images on one monitor, and image transmission function to monitor recording search and real-time screen on telephone line, LAN, leased line and internet even in remote places. It is a multifunctional video digital recording and surveillance system equipment developed to accommodate.

However, most of these PC environment DVR systems have input sensors such as door open sensors and motion detection sensors, and boards that control output sensors such as warning lights and siren. These boards design and use serial communication or dedicated PCI board to communicate with DVR system.

However, this approach has the side effect of raising the price of additional interfaces. Therefore, there is a need for an interface technology that does not incur additional interface costs.

The present invention is to solve the above problems, an object of the present invention is the interface method between the DVR main chip, which is basically a PC environment DVR system, instead of the interface method that adds additional cost to the existing PC environment DVR system I2C bus It is to provide a PC environment DVR system that can interface cheaply using the method.

1 is an overall configuration diagram of a PC environment DVR system according to the present invention.

* Description of the symbols for the main parts of the drawings *

10: PC main board 20: 16 channel video capture board

30: hard disk drive 40: BNC panel board

50: DI / DO panel board 60: control panel board

70: floppy disk drive 80: ethernet card

90: I / O 100: video card

In order to achieve the above object, the input and output interface design method of the PC environment DVR system using the I2C bus of the present invention is an image capture board connected to the PC main board analog video signal input from at least one CCD camera to shoot the monitoring target Video capture board in PC environment DVR system that captures and converts digital signal of high quality to hard disk through central processing unit (CPU), compresses and saves it to hard disk, and displays recorded digital image on monitor. It extends the I2C bus that is used in the board and connects the DI / DO panel board and the control panel board to the expanded I2C bus.

Therefore, according to the above configuration, by extending the IC2 bus, which is essential for communication between chips in the PCB board of the PC environment DVR system, to connect with external boards, it is possible to lower the interface cost and increase the stability of the circuit operation. have.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention will be described in detail.

1 is an overall configuration diagram of a PC environment DVR system according to the present invention.

Referring to FIG. 1, a conventional PC environment DVR system for digital video recording includes a BNC panel board 40 in which analog video signals captured from at least one 16-channel camera photographing a surveillance object correspond to a back panel. When transmitted to the 16-channel image capture board 20 mounted on the PC main board 10 through the video capture board 20 converts the input analog video signal into a digital video signal, the PC main board (10) A central processing unit (CPU) (not shown) mounted on the PC) compresses the high-definition digital video signal converted by the image capturing board 20 and stores it on a hard disk of the hard disk drive 30 in real time. The captured images are displayed on the monitor as a screen divided into a plurality of channels or a screen of a specific channel.

In addition, the DI / DO panel board 50, which may be referred to as a sensor input / output board, is connected to the image capture board 20 described above to detect movement of an object by a plurality of detection sensors installed around a plurality of cameras. In this case, as described above, the image capturing board 20 converts the input analog video signal into a digital video signal, compresses the high-quality digital video signal converted by the central processing unit, and stores the same on the hard disk. In addition, the control panel board 60, which is equipped with various selection switches and corresponding display lamps, which are not shown in the drawings, is electrically connected to the PC main board 10 described above to replace the existing computer keyboard and mouse. Users can easily operate camera selection, screen splitting, camera pan / tilt, etc.

In addition, the I2C bus used for the existing image capture board 20 is extended out of the board to interface with the DI / DO panel board 50 which is necessary for the PC environment DVR system, and the I2C bus extended to the outside. It is connected to the external input / output board DI / DO panel board 50, and also connected to the control panel board 60 can send and receive processed image data.

In addition, the I2C bus is also referred to as Inter-IC BUS and is a two-wire serial bus provided for a communication link between chips in a PCB board in a PC environment DVR system, but the present invention extends the bus out of the board. It was applied to communication with the boards around the PC environment DVR system.

In addition, the interface method using the I2C bus is mainly used within the PCB board not shown because it is a standard for the interface between chips, but in the present invention, it is additionally used by using it as an interface between the external boards 50 and 60. The interface cost can be reduced.

The PC main board 10 has an input / output device for operating with a keyboard and a mouse.

(90), video card (100) to display text and graphics on the monitor, Ethernet card to control the monitoring screen, download video, remote camera, etc. from the remote computer via the Internet (Ethernet Card) 80, a floppy disk drive 70, which can be used when updating or backing up programs to a PC environment DVR system, is connected.

As described above, the present invention is a PCI board inside the PC environment DVR system that has all the ordinary PC environment DVR system, apart from the conventional input and output interface design method that was responsible for sensor input and output by designing additional serial interface or dedicated PCI board in the PC environment DVR system The I2C bus, which interfaces between chips, extends out of the board and replaces the interface between DI / DO panel boards and control panel boards, which can be referred to as external I / O boards, with I2C buses. By providing the interface design technology that does not have the interface cost, which can be added in the existing PC environment DVR system, as well as the stability of the circuit operation can be expected.

Claims (1)

Capture the analog video signal input from at least one CCD camera that captures the surveillance object from the video capture board connected to the PC main board, and convert the digital video signal to high quality digital signal on the hard disk through the CPU. In the PC environment DVR system where the user stores and records the recorded digital images on the monitor, Input / output interface of PC environment DVR system using I2C bus, which extends I2C bus used for image capture board out of board and connects DI / DO panel board and control panel board to the extended I2C bus. Design method.