PVR or personal video recorder is video recording device from TV that has a set-top box. This is named a lot as DVR or digital video recorder, PTR or personal TV receiver, PVS or personal video station and HDR hard disk recorder. 

How a PVR work

It is basically made up of two elements hardware and software and it records and plays back television programs in high definition video format but contrasting a VCR, instead of storing programs in analog, it stores in digital. But like a VCR, the PVR has ability to rewind, pause, stop and fast-forward a program that is recorded. It is able to record a program, replay this program almost immediately with a minor time lag it seems to be a live program. A HD PVR has many capabilities that include indexing, time marking, and non-linear editing etc. it encodes incoming video streams in MPEG-1, MPEG-2 or any other supported format and stores it on a hard disk. HD PVR is a High-Definition video recorder to make real time compressed recordings like H.264 with a resolution of 1080. It records as YCrCb both from cable TV and satellite set top boxes, using a built-in IR blaster that automatically changes TV channels for scheduled recording.

PVR Understanding its Functions

What are features of a PVR

This device also come as part of subscriber service which may be with a charge of monthly fee and have VOD or video-on-demand option TiVo and Replay TV like service providers may also sell this device. TiVo's, SONIC blue’s, Replay TV’s, Sony’s and Philips' PVR are commonly available in the market along with following features.

H.264 high definition encoder for high quality TV recording.
Video input and stereo audio input.
High definition 720p or VGA/D1 up to 1080i resolution.
Data rate up to 13.5 Mbps. 
Make TV recordings onto a standard DVD 
HD video player software inside.
Noise Reduction Function.
Support for NTSC, PAL and SECAM.
Remote control.

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