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POWER
SUPPLY
TECHNICAL DESCRIPTION
611 LTC READER
6111
VITC
READER
SUB-MODULE
7025 KEYPAD/DISPLAY
Figure 6-1: Inside View
The 615 LTC/VITC generator is comprised of a 6150 Base Processor
board and a 6231 VITC generator submodule. The 615 interfaces to the
telecine bi-phase and frame pulse and provides the interface for the
external KeyKode reader. The 615 generator is capable of locking to the 2
field RS-170 (4 field PAL) video standards. A high impedance input tapped
off the video input loop is used to provide correct framing for the 4025's
built-in generator.
The 611 LTC/VITC reader module contains a full speed (1/30 to 70 times
play) LTC reader, and a VITC reader which can read at speeds from still
frame to in excess of 40 times play speed. The powerful MCU firmware
automatically selects valid code from either source and provides accurate
time code reading from still frame to 70 times play speed.
The recovery of recorded LTC time code at other than play speed has
always presented some degree of difficulty, particularly with low end 3/4"
recorders lacking a separate address track. The high speed LTC reader in
the 611 employs sophisticated input conditioning and clock/data separator
circuits to reliably recover LTC over the full shuttle and wind speed range of
most VTR's.
The VITC reader sub-module contains a full wind speed (still to over 45
times play speed) VITC reader, designed for use with non time base
corrected video signals. Although the use of time base correctors will
enhance the recovery range of the VITC reader, the amount of
improvement is dependent on the type of TBC and transport being used.
Model 4025 Film Footage Encoder Manual
7006 I/O MODULE
615 GENERATOR
6231
VITC
GENERATOR
SUB-MODULE
631 CHARACTER
INSERTER
6231
CHARACTER
GENERATOR
SUB-MODULE
Page 6-2
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