Digital Video Recorder (DVR) integrates all functions of video tape recorder, picture splitter, video switcher, controller, video server and remote transmission system. It can connect alarm probe and siren to realize alarm linkage function. Image motion detection, pan/tilt and lens control via decoder, image and control signals over the network. Compared with the traditional analog monitoring system, one of the most notable features of the DVR is its powerful function, which can easily realize network monitoring and sub-control, and has the superiority that the analog system can't match. Digital hard disk recorders are a new trend in the security industry and will quickly replace traditional analog system equipment. Digital Video Recorder (DVR), a digital video recorder, uses hard disk recording compared to traditional analog video recorders, so it is often called a DVR, also known as a DVR. It is a computer system for image storage processing, with long-term recording, recording, remote monitoring and control of images/voices. DVR integrates video recorder, picture splitter, pan/tilt lens control, alarm control, network transmission. With five functions in one, it is possible to replace the functions of a large number of devices in the analog monitoring system with one device, and gradually gain an advantage in price. DVR uses digital recording technology, which is far superior to analog monitoring equipment in image processing, image storage, retrieval, backup, network transmission, remote control, etc. DVR represents the development direction of TV monitoring system, which is currently on the market. The preferred product for TV surveillance systems. At present, the mainstream DVRs on the market use compression technologies such as MPEG-2, MPEG-4, H.264, and M-JPEG, while MPEG-4 and H.264 are the most common compression methods in China; they are soft from the compression card. Compression and hard compression, soft pressure is greatly affected by the CPU, most of which can not be fully real-time display and video recording, so it should be gradually eliminated by compression; from the number of camera input channels are divided into 1, 2, 4, 6 channels, 9 channels, 12 channels, 16 channels, 32 channels, and even more channels; in general, according to the system structure can be divided into two categories: PC-based PC-based DVR and off-PC architecture embedded DVR. Here we mainly talk about PC DVRs and embedded DVRs. PC-type DVR (DVR): This architecture DVR uses traditional PC as the basic hardware, Win98, Win2000, WinXP, Vista, Linux as the basic software, equipped with image acquisition or image acquisition compression card, and the software becomes a set. Complete system. The PC is a general-purpose platform, and the hardware update speed of the PC is fast. Therefore, the performance of the PC-type DVR is improved, and the software modification and upgrade are also convenient. The implementation of various functions of PCDVR relies on various boards, such as video and audio compression card, network card, sound card, video card, etc. This plug-in system is prone to unreliable problems in system assembly, maintenance and transportation. It can not be used in the field of industrial control, only suitable for commercial office environments where reliability is not high. Embedded Hard Disk Recorder (EM-DVR): An embedded system generally refers to a non-PC system, a device or device that has a computer function but is not called a computer. It is a micro-special computer system that is application-centric, software and hardware that can be cut down, and has strict requirements on functions, reliability, cost, size, and power consumption. Simply put, the application software of the embedded system set system is integrated with the hardware, similar to the working mode of the BIOS in the PC. It has the characteristics of small software code, high automation, fast response, etc. It is especially suitable for real-time and multi-task. application. Embedded DVR is an embedded system based on embedded processor and embedded real-time operating system. It uses a dedicated chip to compress and decompress images. The embedded operating system mainly controls and manages the whole machine. Such products do not have as many modules and redundant software functions as PCDVR, and have targeted planning for the stability of software and hardware during design and manufacture. Therefore, the quality of such products is stable and there will be no problem of crashes, and The storage speed, resolution and image quality of the video and audio compression stream are greatly improved, and the function is not inferior to PCDVR. The embedded DVR system is built on an integrated hardware structure. The entire video and audio compression, display, and network functions can be realized through a single board, which greatly improves the reliability and stability of the entire system hardware. The main functions of the DVR include: monitoring function, recording function, playback function, alarm function, control function, network function, password authorization function and work schedule function. 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What is a digital hard disk recorder?
[ Pacific Security Network News ]
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