In our time, complete security is impossible without a security system and a video surveillance system. Many would like to install video cameras to keep track of what is happening in the home. However, without a DVR for the house, this is not done.
What is a DVR?
The DVR is a compact device that records, stores, and plays video information. This electronic device is the main part of the video surveillance system. The DVR, as well as the computer , contains a hard disk, a processor, and an ADC. On some advanced models, even a special operating system is installed.
How to choose a DVR for home?
The modern market offers a wide variety of devices for video surveillance. But for home use it is desirable to choose a model with optimal functions and a small cost. When choosing a DVR, it is important to pay attention to such parameters as the number of channels, the quality of the recording, and the functionality.
Before buying, you need to determine the number of cameras that you want to connect to the DVR. Depending on this, one-, four-, eight-, nine-, sixteen-channel devices are allocated.
One of the important criteria when choosing a DVR is the quality of the recording, which, in principle, determines the usefulness and informativeness of the entire video surveillance system. The optimal resolution can be considered D1 (720x576 pixels) and HD1 (720x288 pixels). However, in addition to this, it is important to compare the resolution with the recording speed, the maximum value of which reaches 25 frames per second. Data received from video cameras are processed in a specific format - MPEG4, MJPEG or H.264. The latter format is considered the most modern.
The functionality of the DVR is no less important. The device must have a video output (BNC, VGA, HDMI or SPOT), an audio input for recording sounds (if necessary), an interface for management, access to the network.
There are various versions of the device. For example, a DVR with a home monitor does not need to be connected to