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LTC output selection when playing back a 25P (23.98P/24P) tape
with a 23.98/24 (25) Hz VTR system added
Since, as shown in the figure above, the video and audio signals are synchronized in the system in which a
tape recorded with a system frequency of 25 Hz is played back on a VTR with a system frequency of 23.98 (or
24) Hz, this function enables 25 Hz TC information to be supplied to an external DAT device for synchronized
operation with the VTR.
When a 1080/25P recorded tape is to be played back in this way on a VTR with a system frequency of 23.98
(or 24) Hz, the function makes it possible for the operator to select that the original 25-frame count TC record-
ed on the tape be output from the LTC_OUT connector in addition to the 24-frame count TC.
Conversely, when a 1080/23.98P or 1080/24P recorded tape is to be played back on a VTR with a system fre-
quency of 25 Hz, the function enables not only the 25-frame count TC but also the original 24-frame count TC
recorded on the tape to be output from the LTC_OUT connector.
[Bear in mind that, with the model AJ-HD3700H, audio signals will not be output properly when a 23.98P (or
24P) tape is played back on a VTR with a system frequency of 25 Hz.]
In short, the function expands the ability of systems to support the connection with and operation of external
devices, and it does this by making it possible for the original TC of pre-recorded tapes to be selected and out-
put from the LTC_OUT connector even when the system frequency of the VTR is at variance from the fre-
quency of the pre-recorded tapes in the manner explained above.
Refer to page 87 for the VTR menu setting items.
(Furthermore, the LTC waveforms which are output from the LTC_OUT connector using this function differ
from the waveforms defined in the specifications. This is because the tapes are played back at a different
speed from the speed at which they were recorded even when they are played back at the normal tape speed.)
25P
25P
HD3700B
LTC_OUT
25Hz TC
HD3700H/A/B
DAT
HDD5 tape
DAT tape
System frequency:
23.98 (or 24) Hz
System frequency:
23.98 (or 24) Hz
System frequency:
23.98 (or 24) Hz
23.98 (or 24)
video signals
23.98 (or 24) audio signals