Conversion Between Drop Frame And Non Drop Frame Counting Modes - evertz HD9010-SIE Instruction Manual

3.5.6.1. Conversion Between Drop Frame and Non Drop Frame Counting Modes

In certain circumstances, it may be necessary to convert from the Non Drop Frame counting mode to
the Drop Frame counting mode. For example, material that originated in a 1080p/23.98 format will
have a 24 frame per second time code, which by definition is non drop frame time code. If that material
is subsequently converted to a 1080i/59.94 format the recommended procedure for conversion of the
time code (according to SMPTE 12M) will result in a 30 frame per second non drop frame time code
where the hours, minutes and seconds are aligned with the 24 frame per second code.
broadcast delivery specifications require Drop Frame time code.
counts' in Drop Frame time code, the time code count will diverge from Non Drop Frame time code,
The Drop Frame and Non Drop Frame time codes will only be co-incident at one frame count which
shall be called the "Sync Point'.
When the HD9010-SIE is operating with 1080i/59.94 or 720p/59.94 video standard, the HD9010-SIE
can be placed in a special Drop Frame conversion mode by setting the GEN DROP FRAME menu item
to convert. In this mode, the HD9010-SIE will be placed into a continuous jam sync mode, and the
Drop Frame mode of the Generator will be set to be the opposite of the drop frame mode of the reader
selected by the PRIMARY READER menu item.
For example, if the PRIMARY READER menu item is set to LTC, and there is Non Drop Frame
timecode connected to the main LTC reader input, the generator will be automatically set to the Drop
Frame counting mode. The generator ATC and the main LTC output will be drop frame time code.
To use the Drop Frame Conversion mode, the user must first set the SYNC POINT register, which
identifies the frame count where the Drop Frame and Non Drop Frame time codes will coincide. To
access the SYNC POINT register press the DISPLAY buttons one or more times or press the
DISPLAY button and turn the SHAFT ENCODER until the display prompt shows
and ESC keys are used in conjunction with the numeric keys to set the value stored in the SYNC
POINT register.
The entered sync point will be rounded down to the nearest minute, as the dropped
frames only occur on minute boundaries.
The HD9010TM OFFSET register can also be used to enter a frame offset to account for frame delays
in a standards converter or other video processing device. To access the OFFSET register press the
DISPLAY buttons one or more times or press the DISPLAY button and turn the SHAFT ENCODER
until the display prompt shows
numeric keys to set the value stored in the OFFSET register.
The examples below show how the time code will be converted in the Drop Frame Convert mode of
operation.
OPERATION
HD9010-SIE High Definition Source ID Encoder Manual
OFS . The ENTER and ESC keys are used in conjunction with the
Revision 1.2
Because of the 'dropped frame
SYN . The ENTER
Some
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