Digital video recorders (DVR) are recording equipment that can record and store digital video on a computer. These can record audio as well as video data from multiple sources.
A DVR is basically a hard drive that can be connected to the computer and to other video sources such as a VCR. It has a tuner which captures the signal using a cable, antenna, or a satellite. The analog signals are compressed and converted into digital signals, which are then stored on the hard drive. A built-in MPEG-2 decoder converts the digital signal back into analog signal when it has to reach the television for viewing. Each DVR has an operating system within the hard drive.
There are several advantages to digital video recorders. They do not require a recording medium like tapes, as the data is stored on the DVR itself. Another main advantage is that the recording and playback can be done at the same time. Using this, even a live program on the TV can be paused, in the sense that the program can be recorded on the DVR and then viewed instead of the live program. However, the space within a DVR is limited, which is its main disadvantage. DVRs also have a live-TV buffer that keeps...
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