Tascam DA-98, Руководство пользователя

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Section 10 – Operations related to timecode
10-10 – 1.00 – 06/97
source in fast wind mode, the tape counter will
flash.
If the timecode source is not clock-synchronized
with the DA-98, a warning will be shown on the
display screen. In this case, although you can
record timecode, it is not recommended, as this
will probably cause problems later on.
5) Stop the external timecode source, and rewind
or reset it to a point prior to where you want
recording to begin.
The tape counter will now start to flash.
6) Restart the source.
The tape counter will display received timecode.
7) Press and hold down
PLAY
and press
RECORD
.
Timecode will now be recorded from the
external source onto the timecode track.
If the tape counter was flashing when the
TC REC
indicator was flashing (the timecode track was
armed), the tape counter will now show all
hyphens, and nothing will be recorded.
10.5.7 Checking external timecode
There is another way you can check external time-
code, as described below. This method is useful
for checking the frame rate of incoming timecode,
if you are not sure what frame rate has been
recorded or is being generated by the timecode
source.
1) Go to menu group E, and move the cursor to
Ext TC :
2) Incoming timecode will be displayed on the
bottom line, together with the frame rate of the
timecode.
10.6 Video resolution
As explained above, if the DA-98 is to be synchro-
nized with a VTR, all units must share a common
video reference for the digital audio clocks, gener-
ated either by the VTR or from a sync generator.
As well as the sample clock, the timecode can be
referenced to a video clock (i.e. the start of each
timecode frame is synchronized with each frame
boundary received at the
VIDEO IN
terminal) or
can be independent of the received frame clock.
Additionally, in a similar way to timecode rechase
mode (page 10-13), the DA-98 can be set to
rechase the video frame sync (muting playback
output as it rechases), or to run freely once sync is
achieved, ignoring any breaks in the received
video signal.
1) Go to menu group 5, move the cursor to
Vid
Rslv (Video Resolve) and press
ENTER
:
2) Use the
LEFT
and
RIGHT
keys to select the
frame synchronization mode ( on/off ) and
the
UP
and
DOWN
keys to toggle it on and off .
3) Use the
LEFT
and
RIGHT
keys to select the video
rechase mode (either free or re-sync ).
10.7 Chasing to timecode
The following sections describe the operation of
the DA-98 when chasing to external timecode.
The operation of the
CHASE
switch is similar to
the way the CHASE switch is used when synchro-
nizing DTRS units (see 9.2.3, “Master/slave set-
tings (CHASE mode)”), but in this case, the
machine ID is not used.
10.7.1 Machine ID and timecode
Since a DA-98 with machine ID set to 1 is always
a master unit as regards DTRS sync operation,
there is no need to make any setting on such a
machine if it is to be a timecode slave. As long as
timecode is received at the
TIME CODE IN
connec-
tor [37] (the
EXT TC
indicator is lit), a unit whose
machine ID is set to 1 will automatically enter
timecode chase mode when the
CHASE
key is
pressed.
However, when a DA-98 unit has its machine ID
set to a value other than 1, there is a conflict when
E x t T C A b s D i f f
T a p e T C R e l D i f f
G e n T C
0 1 : 0 2 : 4 8 : 1 7 3 0 N D
V i d e o R e s o l v e
o n / o f f M o d e
o f f f r e e