evertz 4025TR Instruction Manual page 193

8. KEYKODE READER INSTALLATION
8.1 OVERVIEW
KEYKODE READER INSTALLATION
Latent edge numbers have been present on motion picture negative film
stocks for many years in human readable form.
format has been specific to various manufacturers and film stock types. In
1988, Eastman Kodak, in conjunction with the Society of Motion Picture
and Television Engineers devised a new edge print that not only
standardizes the numbering format, but is also printed as a machine-
readable barcode. Kodak calls this numbering system KeyKode. Other
film manufacturers have adopted this numbering standard and have each
given their version a proprietary name. For the sake of clarity we shall
refer to all of these implementations as Film barcode.
This purpose of this chapter is to describe the installation procedures and
day to day operating practices used when fitting an external Film Barcode
reader to the 4025TR Film Footage Encoder.
The 4025TR Film Footage Encoder interfaces to external Film barcode
readers manufactured by Evertz, ARRI, Cinema Products or Research In
Motion. These units consist of a bar code reader pickup head, and a
decoder device. The pickup head transforms the optical dark and light bar
code into electronic signals and is designed to mount on the telecine feed
roller just before the film enters the gate. The decoder receives these
electronic signals from the pickup head, and sends the decoded KeyKode
number via a serial link to the 4025TR. The way in which the 4025TR uses
the KeyKode information is set using the FILM drop down of the On screen
menu system.
When installing the pickup head on the telecine, an automatic alignment
procedure in the 4025TR calculates the exact perforation offset between
the head and the gate. The one-of-four perforation ambiguity with 35 mm
KeyKode is automatically compensated for each time the film is rolled,
making the day to day operation as effortless as possible. Operation with
the KeyKode reader installed consists of entering the reference frame's
time code number. An on screen KeyKode status display, which shows the
perf that has been detected, and the error between the KeyKode number
read and the biphase based value, is useful in verifying that the correct
operational mode has been selected.
The following sections describe the installation for each of the Film
Barcode reader systems supported. In addition to the physical installation,
there are calibration procedures for the 4025TR that need to be done.
These are detailed in section 2.13.
Model 4025TR Film Footage Encoder Manual
The edge numbering
Page 8-1