Bts Film Frame Pulse - evertz 4025 Instruction Manual

INSTALLATION
To minimize the effects of cross coupling and noise on the bi-phase signals,
which can affect the counting reliability of the 4025, you use a cable which
provides separate shields for each phase of the bi-phase signal.

2.11.2. BTS Film Frame Pulse

In addition to the bi-phase connections, a film frame pulse is required. This
pulse from the BTS telecine, (known as the FRID pulse), changes level
when a new film frame starts in the video output, while the telecine is in
normal play speed.
timecode output to the correct telecine pulldown sequence during the
transfer.
The FRID pulse is a 'square wave' signal that goes high for 2 fields and
then low for 3 fields (or vice versa) when running at 24 frames per second
(in NTSC). The FRID pulse will be a square wave that is high for 2 fields
and low for two fields in 25 frames per second transfers in PAL and 30
frames per second transfers in NTSC. (See Figure 2-11). This signal
should always change level around VSYNC time. The FRID pulse is not
present when the telecine is in STOP. Connect the FRID pulse to pin 2 of
the 9 pin PARALLEL I/O connector.
Connection of a Film frame pulse is required even with PAL video to permit
the 4025 to distinguish the difference between the field 1 and field 2
dominant pull downs.
Do NOT connect the FRID pulse to the "FRAME PULSE" BNC on the 4025.
The telecine type item on the Toolbox Hardware Menu must be set to BTS.
To select the BTS style FRID pulse input (TTL levels) from Pin 2 of the
"PARALLEL I/O" DB-9 connector on the rear panel. (See section 3.6.4)
The film frame item on the Toolbox Hardware Menu is not used with BTS
telecines.
In NTSC configurations, the film rate setting on the FILM drop down menu
may be set to 24 or 30 FPS. (See section 3.4.4)
DO NOT AUTO frame rate with BTS telecines.
The BTS telecines can physically park the film in two places and show the
same picture depending on which direction the reference frame is
approached from. This is not usually a concern, except when doing the
head offset learning. When you park on the reference frame, for head
offset learning, always approach in the forward direction.
Model 4025 Film Footage Encoder Manual
The 4025 uses the film frame pulse to lock its
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