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Chapter 1 Overview
Chapter 1 Overview 1-1
1-1 Features
Chapter 1 Overview
The DVW-M2000/M2000P/2000/2000P is a digital
videocassette recorder based on the digital Betacam
format.
This unit uses large scale integrated circuits for signal
processing, and has a simple internal construction,
allowing it to provide functionality at least equivalent
to a conventional VTR in a compact (4U size),
1) The DVW-2000/2000P does not support these three
formats (Betacam SX, analog Betacam, MPEG IMX).
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lightweight, and low power consumption design.
It not only offers recording and playback in digital
Betacam format, but can also play back tapes recorded
in Betacam SX format, analog Betacam format, or
MPEG IMX format
1)
.
Digital Betacam format
The digital Betacam format is characterized in that the
video and four-channel audio signals of each field are
recorded onto the tape with six helical tracks, at a
slightly slower tape speed and three times faster drum
rotation speed than the analog Betacam formats:
Betacam, and Betacam SP.
As for longitudinal tracks, the digital Betacam format
has a CTL track, a time code (LTC) track and a cue
audio track, similarly to the analog Betacam formats.
However, it does not have a channel-1 audio track, and
this is a solution to expand the space for the helical
tracks.
Digital Betacam VTRs have a greater drum diameter
than that of analog Betacam ones to ensure optimum
digital recording, but their built-in time base corrector
circuit enables them to play analog Betacam tapes
(analog Betacam playback compatibility).
Digital Betacam tape pattern
Full erase head
CTL head
Cue audio
Channel-1 to
Channel-4 audio
Video
Video
Y track
C track
Cue/time code erase head
Audio/time code record/playback head
Time code
CTL (control)
Betacam SP tape pattern
Channel-2 audio
Channel-1 audio