ATO EQ-Link system, Operation Manual

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Operation Manual
Page 18 ATO Aviation Inc.
9.2. Microphone Noise Reduction
The microphone noise reduction when activated will add extra DSP processing
of the signal from the headset microphone to the Intercom system. This
algorithm will remove constant noise signals in the background and process
the voice to remove noise components. Some loss in signal richness is
expected when this mode is activated. Large gains in signal to noise
performance is expected when using this is very noisy aircraft.
9.3. Echo Reduction
The EQ Wireless system uses digital transmission of audio data packets to
send and receive information. This technique causes a small delay of the
audio stream from one end of the system to the other. In some cases the
internal intercom system of the aircraft also has processing delays. When
these delays add up to a certain point the user will get an effect of delayed
side tone, and this will sound like an echo of yourself in you own ear. When
the echo is large and the user is uncomfortable with the sound you will need to
switch the EQ Link into echo cancelling mode to reduce this effect. When in
this mode the EQ headsets will provide the side tone for the user and not use
the side tone provided by the intercom system.
9.4. Intercom Mode
When the EQ Link is operated in this mode, the EQ Link will provide a return
path or side tone path of the audio that is sent to the EQ Link from the
Headsets. This mode is used when the system that the EQ Link is plugged into
has no side tone. This often happens when used in Hand Held Radio systems
as they have no side tone until the PTT is pressed.
9.5. Phone Mode
Use this mode when you want full duplex communications from the 3.5mm
audio connector on the EQ Link. Normally the EQ Link will mute signals the
come into the EQ Link on this connector when VHF Radio traffic is being
received. When turned on and connected into a cell phone then normal
conversations can take place in full duplex.