LTC output selection when playing back a 25P (23.98P/24P) tape with a 23.98/24 (25) Hz VTR system added

 

 

 

23.98 (or 24)

25P

HD3700B

 

video signals

HD3700H/A/B

 

 

 

 

 

 

 

System frequency:

 

 

 

System frequency:

HDD5 tape

 

 

 

23.98 (or 24)

Hz

 

 

 

23.98 (or 24) Hz

 

 

 

 

 

 

 

 

 

 

 

LTC_OUT

25Hz TC

23.98 (or 24) audio signals

25P

DAT

 

 

 

DAT tape

System frequency:

 

 

23.98 (or 24) Hz

 

 

 

 

 

 

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 recorded 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 frequency 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 output from the LTC_OUT connector even when the system frequency of the VTR is at variance from the frequency 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.)

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