evertz 4025 Instruction Manual page 18

Model 4025 Film Footage Encoder Manual
The 4025 Film Footage Encoder interfaces to external KeyKode readers
manufactured by Evertz Microsystems, ARRI, Cinema Products or Research In
Motion. Each of 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 4025.
KeyKode numbers occur approximately every half foot on the film stock, so the
basic numbering of film edge numbers by the 4025 is still driven from the bi-phase
input. The bi-phase base numbers are automatically updated from incoming
KeyKode, taking into account the mechanical offset between the reader head and
the gate, and other delays in the system.
The front panel contains a sixteen digit alphanumeric display to show the
generator and reader time, and user bits, and the film edge numbers. The film key
number of a reference frame may be entered from the front panel keypad, or can
be automatically updated from the KeyKode reader in several ways. The time
numbers may be entered from the front panel, or jam synced to the LTC / VITC
time code reader.
The linear time code output may be used as a bi-phase to LTC translator providing
a master time code reference for the integration of ATR chase synchronizers into
your system.
By using VITC, the film edge numbers become a permanent part of the video and
will remain throughout the editing process. The film numbers may be read from
the edit master to produce an accurate negative cutters list using Evertz Model
623-EDL Edit Lister.
When film material is transferred to video disc, the relationship of the video frames
and picture frames is very important. If the video disc's frames do not correspond
exactly to the picture content (i.e.. film frames) then some pictures will flicker when
viewed in still. The default length of disc frames is 2 video fields. The 4025
'White flag generator' inserts a white level pulse in the first video field of each new
picture. As material is transferred to disc, this pulse is used by the disc recorder to
match the disc frames to the 2/3 pulldown automatically. Still playback of all
pictures on the disk is jitter-free.
The Model 4025 high resolution character generator provides separate windows
for video time and user bits, audio timecode, film edge numbers (KeyKode) and
absolute film frames from a reference. The four windows can be separately
positioned anywhere on the raster. Selection of 1 of 3 sizes, white or black
characters, with or without background are controllable using the on screen menu
system. Characters may be keyed into the picture to which the generator is
locked, or a separate program input.
The key to the operational flexibility of the 4025 Film Footage Encoder lies in the
powerful on screen programming menu system. The programming menu system
uses the built in character generator and provides an quick, intuitive method of
configuring 4025 Film Footage Encoder, guiding you to the correct setup for your
application. The six keys in the format key group (FORMAT, SELECT, , , ,
) are used to cycle through the various items on the programming menu. The
4025 menu system consists of three drop down menus. The TIMECODE drop
down menu is for overall operation modes such as selecting which information is
put into the time and user bits, drop frame mode for the generator, setting reader
modes, setting VITC line numbers, etc. The FILM drop down menu is used to set
up specific film number modes such as KeyKode Jam, film type, film transfer rate,
OVERVIEW Page 1-2