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How a DVR Works

A DVR, digital video recorder, has the same purpose of a VCR or DVD recorder — to record audio and visual data. The difference is, however, that a DVR records programming onto a hard disk drive, rather than a VHS tape or DVD. Also, a DVR has many useful functions that are unavailable with the other two devices, in that it records in "real time". This technology has taken the world by storm and is found in millions of households, yet not many people understand how it is possible to "pause" live television with a simple click of their remote. This is because they don't know the basics of how a DVR works.

Originally used as a means for sports broadcasters to show an instant replay of live games, digital video recording is a means of saving digitized video onto a hard drive. A DVR contains such a hard drive, not unlike the one in your computer. Through digital broadcasting via cable or satellite, digital transmissions are sent via binary code and are capable of being "captured" on a DVR as soon as they stream through. This filtering never stops for as long as you are watching the broadcast. It is this constant live streaming that enables the DVR to pause, rewind and play back what it has just captured, as well as fast forward back to the point of current broadcasting signals.

It is important that a DVR user realizes the full capability of the machine. As previously stated, television programs can be paused and rewound even though the programs will continue to be recorded live. In other words, you can be watching a television show and pause it to take a bathroom break. When you return, you unpause to start where you left off. Even though you are no longer watching the show live, the show continues to be recorded live. This is known as "chase play" and is a great way to avoid ever having to watch commercials again, as you can simply fast forward through them.

When a DVR is explained in simplified terms, the device no longer seems to be such a highly advanced miracle. Although the results are amazing and extremely convenient to users, the technology behind a DVR is no more mysterious than any other kind of television broadcasting or recording. One thing is for sure, however. Those who switch to watching television with a DVR will be quick to ask themselves how they ever lived without it. Even HDTV DVRs are now available for those with high definition televisions.

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