TeachLogic VoiceLink I, Owner'S Manual

a brief word about infrared

Infrared is a light ray that is below the visible spec-
trum, just like the sound spectrum extends beyond 
your hearing ability. An example of infrared trans-
mission 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 receiving 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 sequen-
tial pattern (called modulating the light beam). 
The modulated infrared beam is detected by the 
receiving diode and is electronically decoded. The 
decoded signal activates the circuitry to perform 
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 I converts that sequential 
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 to the speakers. This causes the speaker cone to 
move in sync with your voice. The speaker repli-
cates your voice and disperses your voice evenly 
throughout the room. 

1

IR transmission

The IR transmitter 
transmits directly to the 
sensor. However; due to 
the strength of the IR 
transmitter, the infrared 
signal will bounce off the 
walls, ceiling and floor for 
reception thus providing 
continuous connectivity 
throughout 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 from 
going out of the room. 

“What’s said in 
the room, stays in 
the room”.