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3.3
PROGRAMMING THE BASIC OPERATIONAL MODES - THE TIMECODE MENU
OPERATION
Each of the menu items are described in the following sections, with an
explanation of what each choice does.
The TIMECODE menu is used to configure the basic operational modes of
the 4025 Film Footage Encoder such as selecting what information is put
into the time and user bits, setting VITC line numbers for the generator,
assigning the LTC and VITC readers, etc.
KeyKode numbers contain more information than will fit into the normal
user bits. Evertz has developed the two-line VITC format which permits the
complete Keykode number to be encoded each field (without multiplexing)
into a special pair of VITC lines. In these 'two-line' modes, the Primary
VITC (VITC1) contains the Video tape or 'editorial' timecode with the
production sound timecode in the user bits. The secondary VITC, (VITC2)
carries the full film Key number, including frames, and pulldown
information. Because of the field rate of VITC, this information accurately
reflects what is happening with the 3/2 pulldown during the transfer. The
VITC2 information is encoded with a modified CRC. This is important
because the Time bits of the VITC2 lines contain information that is not in
the standard timecode format, and would be confusing to edit controllers.
In conjunction with other manufacturers, Evertz has developed a 3 Line
VITC format . The 3 Line format allows readers to automatically detect the
film type, film gauge, transfer rate as well as providing room to encode the
VTR Time, film Keykode, pulldown and the production time code and user
bits. The encoded data is contained in a block of three consecutive lines of
the vertical interval. There is an optional block of 3 lines for redundancy.
Off-line transfers, can now be edited without burn-ins to obstruct the
picture. Video and production timecode and Key number information can
be extracted from the VITC after editing by the Afterburner Dual VITC
reader, providing a field accurate cutting copies with film Key numbers
burned in.
3.3.1
Selecting What Data Goes In To The Time And User Bits
GEN ASSIGN Is used to determine what data is in the time and user bits of
the generator. The left column shows what data will be placed
into the time bits of the LTC and primary VITC generators. The
next column shows what data will be put into the user bits of the
LTC and primary VITC generators. The third column shows
what data will be put into the secondary VITC generator.
The first four modes are compatible with the timecode modes of
the model 4015 Film Footage Encoder. The next two modes
place the complete film key number read from an KeyKode
reader into a second set of VITC lines (known as the secondary
VITC lines.) The secondary VITC generator is turned off when
the third column is not shown. The last mode uses the new 3
Model 4025 Film Footage Encoder Manual
Page 21
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