Multipath CDMA video transmission system for monitoring railway field video
A video transmission system and video monitoring technology, which is applied in closed-circuit television systems, transmission of TV signals through single/parallel channels, modification of digital video signals, etc., can solve the problem that image size and quality cannot be adjusted, video real-time performance and image quality are not high, etc. problem, to achieve the effect of adjustable image quality
Inactive Publication Date: 2010-08-11
TIANJIN NORMAL UNIVERSITY
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[0005] This leads to the low real-time and image quality of its video, especially in the period of network congestion, its shortcomings are more prominent; and the image size and quality cannot be greatly adjusted according to the user's wishes
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[0011] Fig. 1 is a system block diagram of the present invention. Fig. 2 is a block diagram of the multi-channel CDMA video monitoring module of the embodiment of the present invention. The solution of the present invention will be described in detail below in conjunction with the accompanying drawings. The present invention adopts multi-channel CDMA module to solve the problem of video bandwidth, changes the front-end compression mode into MJPEG (MJPEG is called the Motion-JPEG compression mode, and its characteristic is not to have inter-frame correlation. System is processed by front-end monitoring subsystem and background video The system consists of two parts.
[0012] The block diagram of the front-end monitoring subsystem is shown in Figure 2, the analog video signal is introduced into the video decoder and the step-by-step separation circuit, the video decoder performs A / D conversion on the video, and the synchronization separation circuit is used to propose line and ...
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The invention discloses a multi-path CDMA video transmission system for monitoring field videos on a railway, which consists of a video front end monitoring subsystem, a CDMA network and a background video processing system. An analog video signal shot by a CCD camera is transmitted a video decoder and a sync separation circuit; the video decoder performs A / D conversion on a video and transmits the video signal after the A / D conversion and a line-field sync signal to a JPEG coder; a video memory is arranged between the JPEG coder and an ARM processor for matching a speed; the ARM process is additionally provided with a high-capacity flash memory for storing compressed images; and the ARM process is connected with a CDMA communication module 1 to the CDMA module n. Therefore, the image quality can be adjusted and can satisfy higher real time requirements of occasions.
Description
technical field [0001] The invention belongs to the technical field of applied electronic products, and designs a multi-channel CDMA video transmission system for field video monitoring of railways. Background technique: [0002] The railway mileage line is long. In order to maintain the safe operation of the railway, it is necessary to carry out continuous video surveillance on many key areas and areas. Among the key locations and areas that need to be monitored, a considerable part is located in mountainous areas, plateaus and other places where wired communication facilities are not perfect, and it is impossible to use wired methods for video data transmission. [0003] For these areas and areas, "wireless video communication" is generally used. In terms of mode selection, GSM (Global System for Mobile communication, Global System for Mobile Communications) and CDMA (Code Division Multiple Access, Code Division Multiple Access) networks are mainly used. The reason is tha...
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IPC IPC(8): H04N7/18H04N7/26H04N7/12H04N19/156H04N19/157H04N19/172H04N19/40H04N19/423
Inventor 宋维
Owner TIANJIN NORMAL UNIVERSITY