Tascam RC-898 - Manual (Page 52)

Section 8.2 - Advanced timecode functions
8-6
1) From menu group 5, move the cursor to
OutTc Src and press SELECT :
2) Use the UP and DOWN keys to select between
the four options available:
8.2.2 Synchronization of timecode
When timecode (including MTC) is output
from a DTRS unit, it may be synchronized to
either the analog or digital outputs, depending on
which is in used at the time. This is necessary
because of the nature of the digital-to-analog cir-
cuitry employed in the DTRS units.
1) From menu group5, move the cursor to
OutTc Tmg , and press SELECT :
2) Use the UP and DOWN keys to select either
digital or analog synchronization for the output
timecode.
8.2.3 Pull up and pull down
When using DTRS units in NTSC telecine situa-
tions, it may be necessary to adjust the sampling
frequency fractionally, as the NTSC frame rate of
29.97 and the cinema frame rate of 24 do not form
a neat mathematical ratio.
The sampling frequencies of 44.1kHz and 48kHz
are therefore affected when the material is trans-
ferred back to film.
Accordingly, the pull up and pull down functions
are provided to allow the adjustment of sampling
frequencies to drop-frame environments.
1) From menu group 8, move the cursor to Fs
Shift and press SELECT :
2) Use the UP and DOWN keys to select one of the
following settings:
If this setting is anything other than off on one
or more DTRS unit, the PULL UP/DN indicator
[10] of the RC-898 will light when the appropriate
machine is selected, as will the indicator on the
DTRS unit(s).
8.2.4 Error bypass
When a DTRS unit is chasing timecode from an
external source, the source timecode may drop out
for a few frames or be otherwise discontinuous. To
allow for this, a “flywheel” facility is provided,
which allows the DTRS unit to continue for a set
period until timecode is received again. The fly-
wheel period may be set for either 10 frames or 30
frames, in the following way:
1) From menu group 4, move the cursor to
ErrByPass and press SELECT :
2) Use the UP and DOWN keys to select between
10 and 30 frames for the “flywheel” period.
8.2.5 Rechase mode
The DA-98 provides another facility which is
used when chasing to timecode.
O u t p u t T C S o u r c e
M a c h i n e 1
T a p e ( T C T r a c k )
TAPE (TC
Track) Outputs the timecode as recorded on
the dedicated timecode track.
TAPE
(ABS) Outputs the timecode as synthesized
from the ABS subcode, with all off-
sets, etc. as set up in 8.1.2, “Synthe-
sizing timecode from ABS times”.
External
(reGen) Timecode received at the timecode
input is regenerated and output.
External
(reshape) Timecode received at the timecode
input is filtered and retransmitted.
O u t p u t T C T i m i n g
D i g i t a l » » » » » »
A n a l o g
M a c h i n e 1 2 3 4 5 6
88
F s S h i f t M o d e
M a c h i n e 1
o f f
off
Pull Down 30NDF
Pull Up 29.97NDF
Pull Up29.97DF
Pull Down 30DF
NOTE
If you want to use the Fs Shift function, make sure that the
reference clock is set to Video
or Int (see 7.2.6,
“Clock selection”). If the reference clock is Word ,
although the setting can be made, the Fs Shift func-
tion will not be enabled.
E r r o r B y p a s s
M a c h i n e 1
1 0 F r a m e
98
98