Studio Technologies ISS - Manual (Page 14)

ISS User Guide Issue 3, June 1990
Studio Technologies, Inc. Page 15
ISS
The easiest way to listen to L+R is to
use an audio amplifier with a mono
button on it. Of course, you can always
use a scope to determine if the polarity
of the wiring or associated patch bay is
correct. Get this test over with now and
you won’t have to worry about it later!
Be warned that a polarity reversal on
the same channel’s input and output
will not show up with this test. A
“double flip” could later lead to incor-
rect Polarity Correction Card or Recog-
nition Card performance. After you have
confirmed the connection polarity you
should resume monitoring in stereo.
6) Place the I/O switch to the NORMAL
position. The green NORMAL LED on
the I/O Card should light; the red LED
on the Transfer Panel Assembly should
also light. You should hear audio at the
same level as heard in the previous
step. You are hearing audio through
the ISS circuitry! If the level does not
match, the most likely cause is an
incorrect INPUT LEVEL or OUTPUT
LEVEL switch setting on the I/O Card.
Recheck your switch settings.
7) Move the MANUAL switch to the SIM
LEFT position. The BYPASS LED will
fade out while the SIM LEFT LED will
light up. The audio you hear is stereo
simulated from the left input channel.
Listen to the left and right output signals
in mono. The simulated stereo effect
should drop out and you should hear a
faithful rendition of the left input signal.
If listening to the sum (L + R) of the ISS
outputs degrades the level and/or
quality of the audio you most likely have
a “double flip,” as was discussed in
step 5. This mono compatibility prob-
lem must be corrected NOW! Once you
confirm mono compatibility, move the
MANUAL switch back to the BYPASS
position. The output will fade from
simulated stereo back to the input
signals. Try simulating from the right
audio input by moving the MANUAL
switch to the SIM RIGHT position. Then
return the MANUAL switch to BYPASS.
8) Place the SYSTEM MODE switch to the
AUTO position. This lets the ISS mode
be controlled by the Recognition Card.
Remember, during system setup you
chose which of the three recognition
modes you wanted active. Most people
will have enabled all three modes, so
mono will be recognized as L=R, left
only, and right only.
Feed a stereo signal into audio inputs.
Remember, do not use sine waves as
your signal source. The BYPASS LED
should be lit.
Feed a mono signal into both the left
and right audio input. If you enabled
L=R is mono, the SIM LEFT LED will
light showing the ISS is simulating
stereo from the left input. If you did not
enable L=R is mono, then the ISS will
stay in the Bypass mode.
Feed a signal only into the left audio
input. If you enabled left only is mono,
the SIM LEFT LED will light showing the
ISS is simulating stereo from the left
input. If you did not enable left only is
mono, then the ISS will stay in the
Bypass mode.
Feed a signal only into the right audio
input. If you enabled right only is mono,
the SIM RIGHT LED will light showing
the ISS is simulating stereo from the
right input. If you did not enable right