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Appendix, cont’d
System 5
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r Plus • AppendixA-6
Glossary
Attenuate/attenuation — To reduce the amplitude (strength) of a signal or current.
Balanced audio — A method that uses three conductors for one audio signal. They
are plus (+), minus (-), and ground. The ground conductor is strictly for
shielding, and does not carry any signal. Balanced audio is also called
“differential audio”.
Bandwidth — A frequency range, or “band” of frequencies between the limits
defined by the “half power points”, where the signal loss is -3dB. In audio
and video, it is this band of frequencies that can pass through a device
without significant loss or distortion. The wider the bandwidth, the better
the quality that results, such as a sharper picture or better sound. The higher
the bandwidth number, the better the performance. (300 MHz is better than
250 MHz.) When a signal passes through a path with more than one device
(including cables), the limiting factor (bottleneck) in that path is the device
with the narrowest bandwidth.
Breakaway — The ability to separate audio and video signals for switching them
independently. For example: the audio and video signals from one source
may “break away” and be switched to two different destinations.
Buffer — Generally referred to as a unity gain amplifier, a buffer is used to isolate
the signal source from the load. A buffer can be used for digital or analog
signals.
Clipping — Cutting off the peaks (or excursions) of a signal. A form of distortion
that occurs when the signal excursions exceed the limits of the circuit, and the
signal flattens out.
Clipping level — An electronic limit (short of the distortion point) to which audio
should be set to avoid overdriving an audio signal. Setting the clipping level
appropriately allows headroom for maintaining signal fidelity.
IR learning — The ability of a device, such as Extron’s System 5cr Plus, to receive
and store infrared commands for other devices, such as a projector. Each
command is assigned to a system operation (such as selecting an input).
When an operation is executed, the associated (learned) command is then
transmitted through an IR emitter or broadcaster to the projector, where it is
executed.
IR library — Sets of downloadable infrared commands (drivers) for video
projectors available at Extron’s web site (
http://www.extron.com).
6. Insert the hooks into the slots, and squeeze the tool gently to grasp the chip.
7. Pull the chip straight out of the socket, and set it aside.
8. Align the slots of the new firmware IC chip with the angled corners of the
socket in the same orientation as the old chip.
9. Gently but firmly press the chip into place in the socket.
10. If you are replacing both firmware chips, repeat steps 5 to 9 for the other chip.
11. Replace the top cover on the System 5 switcher, and fasten it with the screws
that were removed in step 3.
12. Rack mount the switcher, and reconnect the AC power cord.