In the DVR, the images are converted from an analog signal into a digital format to be stored on a hard drive. This is the most important part of the chain. The most popular DVR resolution types are:

Standard Definition
CIF - 352 x 288 pixels.
Half D1 or 2 CIF - 704 x 288 pixels.
D1 - 704 x 576 pixels.
960H - 960 x 576 pixels.

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