A network video recorder (NVR) is that records video in a digital format to a disk drive, USB flash drive, SD memory card or other mass storage device. An NVR contains no dedicated video capture hardware. However, the software is typically run on a dedicated device, usually with an embedded operating system.
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A digital video recorder (DVR), sometimes referred to by the merchandising term personal video recorder (PVR), is a consumer electronics device that records video in a digital format to a disk drive, USB flash drive, SD memory card, SSD or other local or networked mass storage device
Analog camera can record straight to a video tape recorder which is able to record analog signals as pictures with any imaging device; the analog CCTV camera has a sensor which captures the video image. The resolution of the sensor varies, it is limited to 720×575. This is 720 pixels across the screen (horizontal resolution) and 575 up and down (vertical resolution).
An IP camera has an image sensor much like the analog camera. However, once it has captured its image, it transmits it as “data” over a network connection. That data is in the form of compressed video frames sent over standardized networking protocol used for computer applications which is where it gets its name. “IP” stands for Internet Protocol which is the low-level language used to transmit data between computers in your home and the Internet.