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4.2.
3 PERF SOFTWARE
OPTIONAL SOFTWARE
4.1.6. Bit vs. 112 Bit reading
The 611 LTC reader in the 4025 needs to be specifically programmed for
reading either 80 bit (form B) or 112 bit (form C) type code. To do this,
there are two Hot Keys made available. To activate the Hot keys, press
the TIME/UB key and the SHIFT key at the same time as the JAM or VITC
ON/OFF keys.
TIME/UB + SHIFT + JAM
TIME/UB + SHIFT + VITC
A message will be displayed on the front panel to indicate if 112 Bit reading
mode is enable or not.
4.2.1. Hardware Requirements
The following software versions are required:
631:
615:
611:
4.2.2. 3 Perf Numbering
On 35 mm film, the KeyKode numbers change once per foot, or every 64
perforations. There is also a mid-foot KeyKode number which is indicated
by a smaller human readable number and a perf offset of 32. In the 4 perf
format there are 4 perfs per frame, giving 16 frames per foot or KeyKode
number. In the 3 perf format there are 3 perfs per frame giving 21 1/3
frames per KeyKode number. Thus it takes 3 feet to give a whole number
of frames.
Evertz and several other manufacturers have agreed on a
standard way of numbering the irregular 3 perf footage. The first two feet
of the sequence have the Zero frame KeyKode reference dot at the head
and centre perfs of the frame respectively and each contain 21 frames.
The third frame of the sequence has the reference dot at the tail perf, and
contains 22 frames. The drawing below illustrates the numbering sequence
used for 3 perf.
.
Model 4025 Film Footage Encoder Manual
Enable ARRI 112 bit mode
Enable ARRI 80 bit mode
DC31M3.M
TG15C3.D (contains TG15C3.N and TG15C3.P)
JR11L1.D (contains JR11L1.N and JR11L1.P)
Page 4-4
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