Hard disk camera system

Abstract

The invention discloses a hard disk camera system which comprises a hard disk video cassette recorder, a video display device and at least one video camera, wherein the hard disk video cassette recorder is connected with the video display device through signals, and a first twisted-pair interface, a differential demodulation module and a signal output module are connected in the hard disk video cassette recorder in sequence; the first twisted-pair interface is connected with the video camera through a twisted pair so as to receive a video signal differentially processed by the video camera; the differential demodulation module is used for demodulating the differentially processed video signal; and the signal output module is used for transmitting the demodulated video signal to the video display device. The hard disk camera system of the invention can increase transmission distance and enlarge the application range of the hard disk camera system by using the twisted pair to transmit the video signal between the video camera and the hard disk video cassette recorder, can reduce material cost, and can increase transmission stability because the intermediate conversion links of a signal transmission path are reduced. The hard disk camera system can ensure transmission quality, avoid or reduce the phenomena of video distortion, video delay and the like.

Description

technical field [0001] The invention relates to the field of video technology, in particular to a hard disk camera system. Background technique [0002] The hard disk camera system on the market usually includes a hard disk video recorder, a monitor and one or more cameras, and the hard disk video recorder and the camera generally use figure 1 or figure 2 connection method. figure 1 Among them, there are a plurality of BNC connectors 101 in the hard disk video recorder 10, and each BNC connector 101 is connected with a video camera 20 by a coaxial cable 50, and the CVBS (Composite Video Broadcast Signal: Composite Video The video signal in the broadcast signal) format is transmitted to the hard disk video recorder 10, and the hard disk video recorder 10 stores it after processing it, or displays it through a video display device such as a monitor 30. figure 2 exist figure 1 On the basis of the shown connection method, the technology of conversion connection between coa...

AI Technical Summary

Problems solved by technology

The above two methods use coaxial cable 50 to transmit video signals in whole or in part in the transmission path, for figure 1 way, because the transmission distance of the coaxial cable 50 is generally within 500 meters, it is difficult to meet the application scenarios with a long transmission distance, so the scope of use is limited, and the price of the coaxial cable 50 is relatively expensive; figure 2 Although the twisted pair 60 with a transmission distance of 1200 meters is adopted, which can realize long-distance signal transmission and reduce material costs, two converters 70 are used for signal conversion, because an intermediate link is added in the transmission path , the stability is reduced, which may affect the transmission speed and quality of the video signal

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