
SDC 2002
4.3. TK Config Menu
4-87
Operating Instructions - Rev. 1 / 6.2003
3. Check the Keycode
Play a short piece of film and take care that any Keycode is read on the reader
device and compare the keycode of the currently scanned frame with the dis-
played code in the submenu “Timecode”.
Window “Key Code”
Count: Film length in feet
Offset: Frame offset (e. g. 0 -15 for 4 perf 35mm film)
Count & Offset
Film length in feet
& Frame offset
Prefix: Ident of film roll
Fig. 444: Submenu “Timecode” / window “Key Code”
4.3.9 REMARKS CONCERNING THE KEYCODE NUMBERING
Important!
In general the system ensures that the keycode numbering related to the film
frames is always correct for the different film perforations (1, 3, 4).
To avoid an ambiguity of the keycode to the film frame the keycode offset is calcu-
lated according to “SMPTE Recommended Practice RP 195-1998” as follows:
Keycode number repetition rate K (64 perf) modulo the frame repetition rate R
(e.g. 4 perf per frame for a 4 perf 35mm film).
For details, see the next table.
Offset matching for 35mm films
Keycode number repetition rate = 64 perforation holes
(16 frames for 4perf 35 mm film or 21/21/22/21/21/22.. frames for 3perf 35mm film)
Frame Repetition
Rate
Perf/Frame
Keycode Count
(in feet)
Offset (in frames)
3 xxxx +00 .... +20 (21 frames) foot 1/2/4/5
+00 .... +21 (22 frames) foot 3/6..
4 xxxx +00 ... +15 (16 frames)
Defining the first foot of 3 perf films:
The first foot is the foot in which the reference mark appears within the first K-mo-
dulo-R perforations.
Example:
In numbering the frames of 35mm 3 perf, by convention, the first foot and second
foot each include 21 frames, numbered +00 through +20, and the third foot includes
22 frames, numbered +00 through +21.
Keycode numbering
for 3, 4, perf 35mm
films
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