Sony DNW-A100 Operation Manual page 15

DF/NDF (drop-frame/non-drop-frame) switch and
indicators
In a 525/60 system, this switch selects the
mode of advancing the time code generator and CTL
counter.
1)
DF: Drop-frame mode.
NDF: Non-drop-frame mode.
The indicator corresponding to the selection lights.
Note
When the PRESET/REGEN switch is set to REGEN,
since the time code generator is synchronized to the
playback time code, this switch has no effect.
VITC switch and indicator
To record the time code produced by the internal time
code generator as a VITC, press this switch, lighting
the ON indicator.
When the ON indicator is off, internally generated
time code is not recorded as VITC, but VITC present
in the input video signal is recorded unchanged.
!™ REMOTE/LOCAL switch and indicator
To control this unit from a device connected to the
REMOTE-IN(9P) connector, press this switch, turning
the 9P indicator on.
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1) Drop-frame/non-drop-frame mode: In the NTSC
system, the actual frame rate is 29.97 frames per second.
There is therefore a cumulative discrepancy between the
actual frame rate and the 30 frames per second rate on
which time code is based. In drop-frame mode, except
once every 10 minutes, the first two frames are skipped
at the beginning of each minute to keep the time code
values in step with actual elapsed time. In non-drop-
frame mode, the correction is not carried out, and there is
a discrepancy of about 86 seconds per day between
actual elapsed time and time code values.
1)
Chapter 2 Location and Function of Parts
2-7