The traditional difference between digital hard disk recorders

Hard disk recorder (DigitalVideoRecorder, DVR), that is, digital video recorder, as opposed to the traditional analog video recorder, the use of hard disk recording, it is often referred to as hard disk recorders, also known as DVR. it is a set of image storage and processing of computer systems, with a long time on the image/voice video recording, audio recording, remote monitoring and control functions, DVR collection of video recorders, screen splitter, PTZ lens control, alarm control, network transmission and other five functions in one device can replace the analog surveillance system. And control functions, DVR collection of video recorders, screen splitter, PTZ lens control, alarm control, network transmission and other five functions in one, with a device can replace the analog monitoring system a whole lot of equipment, and gradually take advantage of the price.

DVR is a digital recording technology, image processing, image storage, retrieval, backup, and network transmission, remote control, etc. is also far superior to analog monitoring equipment, DVR represents the direction of development of the television monitoring system, M-JPEG, and MPEG-4, H.264 is the most common compression; from the compression card on the points of the soft compression and hard compression of two kinds of Soft compression is affected by the CPU, most of them can not do the full real-time display and video, so it should be compressed gradually eliminated; from the number of camera inputs are divided into 1-way, 2-way, 4-way, 6-way, 9-way, 12-way, 16-way, 32-way, and even more ways;

In general, according to the system structure can be divided into two major categories: PC-based architecture PC-based DVR and detached from the PC architecture of the embedded DVR. Here we mainly talk about PC-based DVR and embedded DVR. Embedded system generally refers to non-PC systems, computer functions but not known as computer devices or equipment. It is application-centered, hardware and software can be cut down on the function, reliability, cost, volume, power consumption and other stringent requirements of the miniature special-purpose computer systems.

Simply put, the embedded system set of system application software and hardware into one, similar to the PC in the BIOS way of working, with a small software code, a high degree of automation, fast response time and so on, especially suitable for the requirements of real-time and multi-tasking applications. Embedded DVR is based on embedded processors and embedded real-time operating system embedded system, which uses a dedicated chip for image compression and decompression playback, embedded operating system is mainly to complete the control and management of the machine. Such products do not have PCDVR so many modules and redundant software functions, in the design and manufacture of software and hardware stability of the targeted planning, so the quality of such products is stable, there will be no crash problems, and in the video and audio compression stream storage speed, resolution and picture quality have been improved, as far as functionality is concerned is no worse than PCDVR.

Embedded DVR system built on an integrated hardware structure, the entire video and audio compression, display, network and other functions can be realized through a single board, greatly improving 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.