Studio Technologies ISS - Manual (Page 15)

Issue 3, June 1990 ISS User Guide
Page 16 Studio Technologies, Inc.
ISS
only is mono, then the ISS will stay in
the Bypass mode.
9) Place the POLARITY CORRECTION
switch to the OPERATE position. The
CORRECTING LED should not be lit.
Feed signals into the left and right
audio inputs with the signals 180 de-
grees out of phase with each other.
This could be a mono or stereo signal
into both channels, 180 degrees out of
phase. The CORRECTING LED should
light when this condition is detected,
and will hold in the correcting mode
until signals with correct polarity are
presented on the inputs. The closer the
signals are to 180 degrees out of phase
with each other, the quicker the correc-
tion will take place. Mono signals 180
degrees out of phase and fed into the
left and right audio inputs will correct
very quickly. Audio material with lots of
stereo content, but 180 degrees out of
phase, will take longer to correct. Great
stereo signals are in a sense out of
phase between left and right; there is
lots of phase incoherence. The circuitry
has to cut through the valid phase
differences and find the error! To en-
sure that the input select switches are
correctly set on the Crossfade and
Recognition Cards, listen in mono to
the sum of the left and right outputs.
Feeding out of phase input signals,
listen to the output corrected and un-
corrected. Uncorrected, you should
hear significant cancellation. Corrected,
you should hear the sum of left and
right in full fidelity.
10) If you have connected remote control
input signals, now is a good time to try
them out. Place the I/O switch to the
NORMAL + REMOTE position, making
the circuit accept a remote control
signal. Apply the Remote I/O Bypass
signal, either a continuous or momen-
tary signal depending on your previ-
ously selected configuration. The I/O
NORMAL LED should go out and the
audio input signals will connect to the
audio output connectors. Either stop
the continuous signal, or again apply
the momentary signal. The NORMAL
LED should light again.
On the Polarity Correction Card, place
its switch in the OPERATE + REMOTE
position. Apply the Remote Polarity
Correction Function Disable signal,
either a continuous or momentary
signal depending on your previously
selected configuration. The REMOTE
DISABLE LED should light. Either stop
the continuous signal, or again apply
the momentary signal. The REMOTE
DISABLE LED should stop lighting.
Place the SYSTEM MODE switch to
AUTO + REMOTE, making the circuit
accept remote control signals. Apply
the Remote Control Enable signal,
either a continuous or momentary
signal depending on your previously
selected configuration. The REMOTE
LED should light. Apply a continuous or
momentary Remote Simulate from Left
signal. The system should immediately
go into the simulate from left channel
mode. Removing the continuous signal,
or again applying a momentary signal,
returns you to the Bypass mode. Try
applying the Remote Simulate from
Right command, then return to the
Bypass mode. Either stop the continu-
ous signal, or again apply the momen-
tary signal on the Remote Control
Enable input. The REMOTE LED should