How Do Digital Video Recorders Work?
Types of Digital Video Recorders
Digital Video Recorders (DVR) are devices that record television shows as they air on TV. Differences in DVRs are generally in how many tuners they have. Each tuner in a DVR allows it to record another program. For instance, a dual-tuner DVR (which came out in 2003) can record two programs at the same time or record a program while another is being watched. Although DVRs can have multiple tuners, most DVRs use only one hard disk to record programs.
DVR Recording
DVRs use a hard disk drive to record information from your TV. A hard disk drive records information by magnetizing a magnetic strip in one of two directions. As one may surmise, the direction determines whether the coding is a 1 or a 0, the code of binary. DVRs use tuners to tune into information broadcast over the television, which they then record on hard drives.
Playback of Programs
Playing program recorded on a digital video recorder is similar to reading information off a computer hard drive. The magnetic information stored on a hard drive can be read by magnetic detectors, or readers. This means that the information for the program recorded on the DVR can be read by the DVR then fed as a video to your TV, similar to how a DVD player feeds video to your TV.
Tags: Digital Video Recorders, Video Recorders, Digital Video, hard disk, disk drive
