Definitions - evertz 4025TR Instruction Manual

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1.2 DEFINITIONS

OVERVIEW
Items of special note for all users are marked with a double box like this.
KeyLog TRACKER™ procedures for configuring the 4025TR are identified
with the following symbol located in the margin.
LINEAR TIME CODE: (Also known as Longitudinal Time Code) A digital
code used for timing and control purposes on video tape and
associated audio tape machines. It is recorded on a linear track
with audio characteristics and is referred to as LTC. Each 80 bit
code word is associated with one television frame, and consists
of 26 time bits, 6 flag bits, 32 user bits and 16 sync bits.
VERTICAL INTERVAL TIME CODE: A digital code used for timing and
control purposes on video tape which is recorded in the vertical
blanking interval of the video picture, and is referred to as VITC.
Each 90 bit code word is associated with one television field,
and consists of 26 time bits, 6 flag bits, 32 user bits, 18 sync
bits, and an 8 bit error check (CRC) code.
USER BITS: 32 bits in the time code are user assignable. They typically
are used to contain reel numbers, scene and take numbers, or
other user-oriented data. The 4025TR Film Footage Encoder
can be used to put film footage and frame numbers into the user
bits during the transfer process from film to video.
DROP FRAME: In NTSC systems, where the frame rate is 29.97002618
frames per second, the drop frame mode permits time of day
indexing of the frame numbers by dropping certain frame
numbers. Specifically, frames 0, and 1 at the beginning of each
Model 4025TR Film Footage Encoder Manual
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