9
INSTALLATION & OPERATION
MUSIC INPUT:
The non-sync music inputs for the MODIIC feature a
special music matrix decoder that separates in-phase
and out-of-phase signals on a standard two channel
recording (CD player or tape) and creates four chan-
nels of auditorium music. Connect your stereo music
source to the MUSIC LEFT and MUSIC RIGHT inputs
on the back of the MODIIC.
Occasionally, a theatre may use a monaural sound
player such as a background music cartridge player
that does not have stereo capabilities. A jumper on the
OUTPUT CARD in the MODIIC is moved to the
MONO position for this use. The music source should
then be connected to both LEFT and RIGHT MUSIC
inputs. Music will appear on all stage channel and sur-
round speakers when mono material is feeding the
sound system.
FORMAT SELECT TERMINALS:
A momentary ground contact to one of the FORMAT
SELECT inputs on the rear of the MODIIC will switch
the processor to any desired format, including music.
When the MODIIC is in music mode and any one of
the film formats are pulsed, the film sound will appear
at the main outputs, and the music will slowly fade
out. While the processor is in one of the film formats
and the music terminal is pulsed, the MODIIC will
fade from the film mode to music.
Note: The MODIIC powers up in Music mode.
DIGITAL INPUTS:
The MODIIC system has six inputs (Left, Center,
Right, Left Surround, Right Surround and Sub) via a
DB25 input connector marked DIGITAL INPUTS that
can be used to process the outputs from an external
digital decoder (i.e. DTS, Dolby Digital). The DIGITAL
INPUTS accept any high level multi-channel source.
The audio signals are processed through the individ-
ual equalizers, Output Card and Master VCA circuit
before they appear at the Main Outputs. These signals
do not pass through the Matrix or Time Delay circuits.
See the REAR CHASSIS DB25 SECTION for specific
pinout designation.
Another application of the Digital Input terminals is
for external sync sources. Sound-Interlock from a 35
mm reproducer or a single 16 mm projector may be
fed into the DIGITAL INPUTS and selected with the
front panel DIGITAL program switch on the MODIIC
Format Card.
REAR CHASSIS DB25 CONNECTOR:
The computer-type DB25 connector marked DIGITAL
INPUTS on the back of the processor is for an external
digital decoder. SMART provides the proper cables
for the different digital decoders available on the mar-
ket. See below for specific pinout configuration.
The DIGITAL DB25 inputs
Pin 1
Left
Pin 3
Center
Pin 5
Right
Pin 6
Left Surr.
Pin 7
Right Surr.
Pin 8
Sub
Pin 12 Digital Select
Pin 13 Stereo A / Stereo SR Default*
Pin 14-25 Ground
*see Default Optical Selection below
DEFAULT OPTICAL SELECTION:
External digital decoders available on the market have
a function that instructs the processor to switch to an
optical format in the event that the digital decoder
fails or loses time code. When this happens, the digital
decoder will pulse a special terminal to ground to alert
the processor to switch to the optical format.
On the MODIIC Digital DB25 input connector, this ter-
