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How Home Theater and HDTV Work by Michael Troller, Michael Miller

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Chapter 17. How Digital Video Recorders Work

How Digital Video Recorders Work

A digital video recorder, or DVR, is like a VCR without the tape. Instead, programming is recorded on a hard disk, like the kind used in personal computers. The hard disk records programs digitally, which means that the recording can be identical to the original, with no loss in audio or video quality.

Hard disk recording offers several other advantages to recording on tape. One big benefit is instant access to any point in the recording. With a videocassette, which offers sequential access only, you have to fast forward and rewind the tape to get to the exact point you want; with hard disk recording’s ...

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