Vitc Generator Interface - evertz 4025TR Instruction Manual

Model 4025TR Film Footage Encoder Manual
the highest biphase rate possible. Correct connections will result in EDGE
numbers that increment or decrement when the telecine moves in the
forward or reverse direction respectively. To adjust the 4025TR to the
correct biphase rate, use the BI-PHASE item of the Toolbox HARDWARE
menu.
Once per frame the MCU reads the value of the derived counts from the
quadrature decoder chip and uses this value to accurately track the
telecine position.
The Film frame advance pulse from a Cintel telecine is connected to the
FRAME BNC connector on the 4025TR rear panel. This active low pulse
occurs when a new film frame starts in the video output, while the telecine
is in normal play speed. The 4025TR uses the film frame pulse to lock its
timecode output to the correct telecine pulldown sequence during the
transfer. Figure shows some specifications of the expected Frame Pulse
into the 4025TR for a Cintel type of telecine. This should allow you to verify
that you have connected the appropriate signal.
The actual DC voltage level of the film frame pulse is not critical as long as
a 3 volt peak to peak minimum signal is applied. The film frame pulse is
sampled in the LCA once per video field on the trailing edge of the VSYNC
pulse.
The Film frame advance pulse from a Philips telecine is connected to the
PARALLEL I/O connector on the 4025TR rear panel. This active square
shaped pulse changes state when a new film frame starts in the video
output, while the telecine is in normal play speed. The 4025TR uses the
film frame pulse to lock its timecode output to the correct telecine pulldown
sequence during the transfer. Section 2.12.2 shows some specifications of
the expected Frame Pulse into the 4025TR for a Philips type of telecine.
This should allow you to verify that you have connected the appropriate
signal.
If the right hand LED on the 615 module is blinking, or dim, or flickering
rapidly, this is an indication that the Frame Pulse input is not satisfactory.
See sections 2.10.2 and 2.12.2 for a complete description of connections
between the 4025TR and your telecine.

6.5.6 VITC Generator Interface

The VITC generator logic and video keyer is contained on a separate
submodule (6231), which connects to the base module via header J4/5.
Program video, VSYNC, SYNC as well as the MCU address and data bus
are fed up the header to the submodule. Jumper J3 selects the video
source for the VITC keyer. Placing J3 in the forward position routes the DC
restored video used to provide a reference on the 6150 module to the VITC
keyer. Placing J3 in the rear position connects the VITC keyer to a
separate non-restored program video input. J3 should be placed in the
rear position for correct operation of 6121 Sub Module.
TECHNICAL DESCRIPTION Page 6-16