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DV Terminal
This terminal is used to input/output video and audio data
on digital video equipment. Because the video and audio
data is sent through the DV cable as digital signals, there is
practically no deterioration in video and audio quality after
copying. In addition, because the hardware automatically
determines the direction of flow for input and output signals
according to the state of the unit, there is no need to change
the connections around when switching between input and
output, as is the case with conventional AV cables.
In addition, the DV terminal on this unit can also send
control signals that are required in editing operations. If a
Panasonic Digital Video Camera is used as the playback
unit, only one DV cable needs to be connected between the
camera and this unit in order to perform the following editing
functions:
Copying, Assemble, Video Insert, and Audio Insert.
(Such a configuration does not permit AV Insert, Audio
Dubbing, or Audio Mixing. AV cables must also be
connected.)
The following functional differences exist when the recording
unit and the playback unit are connected through the DV
terminal, as opposed to when they are connected through
the audio and video sockets:
The original sub code data (date of the recording,
photoshot index signals, etc.) on the playback unit is
copied as is on the recording unit.
(Time codes are not copied.)
The audio is recorded in the same mode (12bit or 16bit)
on the recording unit as it was on the playback unit. (If
you want to change the audio recording mode, the units
must be connected through the audio and video sockets,
not the DV terminal.)
No audio is output while searching with the Jog Dial/
Shuttle Ring.
The AV-IN Color Level and the AV-IN Hue Level settings
on the SET UP menu are not available.
When playing a tape that was recorded with two audio
channels (main and sub; from a bilingual broadcast, for
example), both the main audio channel and the sub audio
channel are output, regardless of the audio select (main/
sub) setting.
Horizontal sway may appear at the bottom of the screen
for video input from the DV terminal, but this has no effect
on the recording.
Time code
Time codes are time data that is recorded on a tape. The
time is expressed in units of hours (h), minutes (m), seconds
(s) and frames (f). (One second is equivalent to
approximately 30 frames.) Time codes are recorded
concurrently while video is recorded. If a recording is made
continuously from the beginning of a tape, the time codes
can be used to determine the absolute position of video and
audio recorded on the tape.
When you first record on a brand new (completely blank)
cassette, the time codes are also recorded, starting from
zero. If you start recording in the middle of a cassette that
has already been partially recorded, and you start where the
previous recording ended, the time code values continue
from the ending value of the previous recording. However, if
you start recording in the middle of a tape after a blank
section of tape, the time codes again start from zero.
Because one frame is equivalent to approximately l/30 of a
second, if you record continuously for an extended period of
time, a slight discrepancy will eventually arise between the
time codes and the actual duration of the recording. In the
digital video SD standard, compensation for this
discrepancy between the time codes and the actual duration
is applied by using the drop frame method.
(Refer to the explanation of Drop frames.)
Drop Frame
Because one frame (f) in NTSC Time codes is equal to 1/30
of a second, recording continuously for an extended period
of time will result in a slight discrepancy between the time
codes and the actual duration of the recording. The drop
frame method automatically compensates for this
discrepancy by skipping frame 00 and frame 01 at the 00
second mark of every minute, except for the 0, 10, 20, 30,
40, and 50 minute marks.
Frame
Movement in a video image is produced through a series of
successive still images in the same manner as a movie. In a
video, there are 30 stills per second: one still is called a
“frame.” In the NTSC format, one frame of the time code is
equivalent to approximately 1/30 of a second.
Tape Counter (Linear counter)
This counter mode is used to display the elapsed recording
or playback time. Because the value that is displayed is
derived from the length of tape travel, it is not possible to
display the precise tape position, as it is with time codes.
When a cassette is loaded, the counter is reset to “0:00.00”.
The counter can also be reset to “0:00.00” at any position
simply by pressing
RESET.
You can keep track of the
elapsed recording or playback time by resetting the counter
when you start recording or playback.
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