a brief word about infrared
Infrared is a light ray that is below the visible
spectrum, just like the sound spectrum extends
beyond your hearing ability. An example of infra-
red transmission is the remote control for your TV
set. When a button is pressed, a beam of infrared
light is emitted by a Light Emitting Diode (LED)
from the remote control. It is detected by a receiv-
ing diode in your TV set. When you press a certain
command on your control, the internal electronics
cause the infrared light to flicker in a programmed
sequential pattern (called modulating the light
beam). The modulated infrared beam is detected
by a receiving diode and is electronically decoded.
The decoded signal activates the circuitry to per-
form the command function on your TV set.
So how does this apply to the infrared communi-
cation system you are about to start using? The
microphone/transmitter has several Light Emitting
Diodes (LED) that emit infrared light beams to the
sensor located in the corner of the room. Now
when you talk into the microphone, the micro-
phone element modulates the light beam, causing
it to flicker in sync with your speech. The sensor
detects the sequential signal and the electronic
circuitry in the VoiceLink PLUS converts that se-
quential signal into a line level analog audio signal.
Now that audio signal can be fed into an amplifier.
The amplifier magnifies the electronic signal and
sends it output to the speakers. This causes the
speaker cone to move in sync with your voice. The
speaker replicates your voice and disperses your
voice evenly throughout the room.
1
IR transmission
The microphone/trans-
mitter transmits the voice
directly to the sensor
via an infrared signal.
Although infrared light is
straight line directional,
the signal is transmitted in
a special pattern and can
bounce off solid surfaces.
Thus, continuous connec-
tivity is assured through-
out the room.
Benefit: total freedom
of movement within the
room with no restriction
of orientation.
Infrared will not
penetrate a solid surface
thus preventing any
transmission going
out of the room.
“What’s said in
the room, stays in
the room”
