evertz 9025TR Series Instruction Manual page 17

Film Time Code: See Aaton Code, ARRI Code
Gen lock: In order to derive the 6 Hz relationship between 23.98 Fps and 29.97 Fps frame boundaries,
and to ensure that the timecode to 6 Hz relationship is fixed, an NTSC colour black video
reference must be supplied to the HD9025TR Film Footage Encoder. Normally, the gen lock
signal is the colour black system reference to which the 24p tri-level sync generator is gen
locked. The gen lock reference is only necessary when the system video type is
1080p/23.98sF.
Ink number: An identifying number is stamped along the edge of the work print and the associated
magnetic audio stock. These numbers, also known as ACMADE NUMBERS, occur at one foot
intervals, hence they have also become known as footage numbers. The film frames between
the edge numbers are identified by interpolation from one edge number to the next.
These Ink Numbers are typically used to keep the picture and sound in sync throughout the
work print conforming process.
ITU: The United Nations regulatory body governing all forms of communications. ITU-R (previously
CCIR) regulates the radio frequency spectrum, while ITU-T (previously CCITT) deals with the
telecommunications standards.
ITU-R601: An international standard for standard definition component digital television from which was
derived SMPTE 125M and EBU 3246-E standards. ITU-R601 defines the sampling systems,
matrix values and filter characteristics for both Y, B-Y, R-Y and RGB component digital
television signals.
ITU-R709: An international standard for High definition component digital television from which was
derived SMPTE 274M and SMPTE 296M standards. ITU-R709 defines the sampling systems,
matrix values and filter characteristics for both Y, B-Y, R-Y and RGB component digital
television signals.
Jam sync: Refers to the operation of slaving the generator to data coming from the reader. Jam sync
should be used when dubbing time code from one tape to another, as the quality of the time
code signal deteriorates with each generation, and will become unusable after the third
generation.
In the jam sync mode, the generator and reader times are compared with each other during
each frame, automatically compensating for the decoding offsets. If for any reason they are not
equal, the jam is bypassed, and the next frame number is substituted by the generator. If the
number of consecutive jam bypass errors exceeds 5, the last valid reader time is jammed into
the generator again. In the absence of valid reader data within the last 5 frames, the generator
continues to increment normally until valid reader code resumes. At this time it will be re-
jammed to the reader, thus repairing large dropouts on the reader tape.
KeyKode: Machine readable bar-coded edge numbers introduced by Eastman Kodak in 1988, and
subsequently standardised for all film manufacturers by the Society of Motion Picture and
Television Engineers as SMPTE 254M (35mm), SMPTE 271M (16mm), SMPTE 270M (65mm
– 80 perf repetition) and SMPTE 313M (65mm – 120 perf repetition). AGFA refers to it as
BAR Code, and FUJI as MR Code. For the sake of consistency throughout this manual we
shall refer to it as KeyKode.
OVERVIEW
9025TR Series Film Footage Encoders Manual
Revision 1.3
Page 1-7