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Standard recording time is up to 90 minutes for PAL and 120 minutes for NTSC. These times are doubled for Long Play (LP) recording mode. (The cassette holds the same length tape; tape consumption is different between PAL and NTSC recorders.) Longer tapes were available, but were less common.
A hard disk recorder (HDR) is a system that uses a high-capacity hard disk to record digital audio or digital video.Hard disk recording systems represent an alternative to reel-to-reel audio tape recording and video tape recorders, and provide non-linear editing capabilities unavailable using tape recorders.
Scanning techniques used in video tape recorders. (A) Transverse scanning used in the early quadriplex system requires several vertical tracks to record a video frame. (B) Helical scan, by recording in long diagonal tracks, is able to fit a full video field onto each track. The first full-helical system uses one head, requiring tape to wrap ...
The first digital video recorders were designed to record analog television in NTSC, PAL or SECAM formats. To record an analog signal a few steps are required. In the case of a television signal, a television tuner must first demodulate the radio frequency signal to produce baseband video.
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The recorder writes the video signal onto a recording medium, such as magnetic videotape. Since the record function involves many signal-processing steps, some distortion and noise historically appeared on the stored video; playback of the stored signal did not have the exact characteristics and detail as a live video feed.