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2.12 CONNECTING A PHILIPS TELECINE
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INSTALLATION
8. After you have made any adjustments, park the telecine with the
reference frame in the gate and repeat steps 5 through 8 until
you have satisfactory results.
Two signals, (biphase tach and FRID pulse) must be connected from the
telecine in order to generate field accurate time code. The location and
description of these signals depend on the model of your telecine. Sections
2.12.1 and 2.12.4 provide an overview of the Philips connections. Sections
2.12.3 to 2.12.6 provide some additional information specific to various
telecine models. In addition to making the physical connections to the
telecine you will have to select the biphase rate, telecine type and set up
for any video processing delays between the output of your telecine and
the input of the 4025TR. Section 2.12.7 provides a procedure to verify that
you have made the necessary connections and settings for your telecine.
This procedure should be followed before proceeding to KeyKode
installation.
2.12.1 Biphase Tach from the Philips Telecine
The 4025TR is fitted with a nine pin female 'D' connector (PARALLEL I/O)
for connection to the telecine. The pin connections are shown in Chapter
7.
The BPH1 and BPH2 inputs (pins 3 & 7 respectively) should be connected
to biphase quadrature tach pulses from the telecine. These TTL level
pulses usually come at a rate of 10 pulses per film frame. The 4025TR can
also accommodate tach rates of 1, 2 or 5 pulses per frame. For best
results use the highest biphase rate possible. To adjust the 4025TR to the
correct biphase rate, use the biphase rate menu item of the Engineering
toolbox hardware menu. (See section 3.6.3) Correct connections will result
in EDGE numbers that increment and decrement when the telecine moves
forward and reverse respectively. In the event that the 4025TR counts in
the reverse direction when the telecine is in the forward direction, reverse
the two biphase connections to the 4025TR.
To minimize the effects of cross coupling and noise on the biphase signals,
which can affect the counting reliability of the 4025TR, you use a cable,
which provides separate shields for each phase of the biphase signal.
2.12.2 Philips Film Frame Pulse
In addition to the biphase connections, a film frame pulse is required. This
pulse from the Philips telecine, (known as the FRID pulse), changes level
Model 4025TR Film Footage Encoder Manual
Page 2-23
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