What are the differences between DVR, nvr, and ipvs?

DVR (digital DVR)
DVR (digital DVR) is the second generation monitoring system that has developed rapidly since the simulation video system in recent years. Using a microcomputer and a Windows platform, you can install video compression cards and corresponding DVR software on your computer. Different video cards can be connected to 1/2/4 videos and support real-time video and audio, is the first generation of analog monitoring system upgrade to achieve digital options.
DVR system features: video and audio signal collection and storage are mainly in digital format, with high quality. The system has powerful functions and can exchange data with the information system; the application is more flexible. However, due to the limitations of its technical architecture, the Digital Hard Drive video recorder has never been able to solve problems such as long latency in the network remote monitoring environment, multi-channel simultaneous monitoring, and highly integrated centralized monitoring.
the reason is that the DVR system is transmitted in analog mode from the monitoring point to the monitoring center. Similar to the first generation system, there are many defects. To achieve long-distance video transmission, it must be laid (rented) video optical terminal equipment is installed at both ends of the optical cable. The system construction cost is high, it is difficult to maintain and the maintenance cost is high. This system is only suitable for the transformation of traditional monitoring systems. It is not suitable for new monitoring systems and requires remote video transmission (more than 1 ~ 2 km) system.

nvr
with the development of Internet, broadband network, and information processing technologies, web server-based remote video monitoring ?? The embedded DVR system has sprung up. Generally, it is called the embedded DVR as a 2.5-generation monitoring system ?? That is, the network video recorder nvr.
in the video monitoring system, nvr is an ideal upgrade product for analog recorders and hard drive recorders, it is a stand-alone operating device that eliminates the need for Windows operating systems to work with computers based on the original DVR. Nvr adopts highly integrated chip technology and features advanced digital video recording, storage, and replay functions. It does not need to replace or store video tapes, and does not require computer coordination and routine maintenance. Therefore, high Resolution (Full-D1 resolution can be achieved), high-quality real-time monitoring, and easy to use.
in simple terms, the nvr system digitizes traditional video, audio, and control signals and transmits them over the network in the form of an IP packet through the network interface on the nvr device, based on the DVR, the system is networked.
in application, although the nvr system has the advantages of computer fast processing capability, Digital Information Anti-interference capability, fast query records, clear video images, and single-host multi-path images. However, in essence, nvr not only does not solve the shortcomings of analog transmission in the DVR system, but also does not solve more management problems brought about by video stream transmission over the network. In fact, each nvr forms an independent monitoring center, which makes the implementation of network-wide monitoring more complex. It also needs to be improved in terms of remote control, multi-layer scalability, and networking capabilities.

Ipvs (Network Video Surveillance System)
Fully networked Video Surveillance System (ipvs? IP Video Surveillance). When a video is output from an image collection device, it is a digital signal. It uses a standard Internet network as the transmission medium and adopts the Streaming Media Technology Based on the international standard TCP/IP protocol, enables multiplexing of videos on the Internet, and completes video stream forwarding, alarm, and other operations by setting the video stream server on the Internet, to achieve the entire monitoring system's command, scheduling, storage, authorization control and other functions. In addition, the digital signals output by front-end devices such as alarm, access control, and patrol can also be transmitted through network multiplexing in a multi-network mode, and managed and controlled on the same platform.
Fully networked video surveillance system ipvs. The entire system is implemented based on TCP/IP network protocols and standard encoding devices, you can use standard network cameras, network devices, network servers, network storage devices, and computer products to establish a video monitoring system. Ipvs not only has the advantages of traditional local digital monitoring systems such as fast computer processing capabilities, Digital Information Anti-interference capabilities, fast query records, clear video images, and single-host display of multiple images, but also, it can take full advantage of the advantages of the broadband network. Through the IP network, the monitoring targets anywhere that can be reached are combined into a complete and integrated system, it truly adapts to the needs of the current video monitoring system for remote, real-time, and centralized control. Users just need to sit in the monitoring room and tap the mouse to quickly complete digital search and restoration functions, and digital images are clearer and easier to be recorded and played back.
The all-IP video monitoring system not only has all the advantages of DVR and nvr, but also has other advantages: the fully-networked s solution, which can be compatible with and support a variety of original analog video devices, protects users' investment and business environments. The ipvs system can also expand more monitoring and analysis functions, making it possible to integrate video monitoring with other applications in the same enterprise IT environment. In addition, the ipvs solution has outstanding advantages in multimedia application digitalization, networking, intelligence, systemization, and ultra-large scale networking capabilities.
 

Source: http://www.skyvio.com/htm/2007-05/37.htm