BHI NEMS, Руководство по эксплуатации и установке

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Page 11 NEMS operating manual
3. Operation
3.
Operation
3.1 Operation
The NEMS speaker provides noise cancellation when power is
applied to the speaker and it is switched on. Removing the power,
or switching the
NEMS off will remove the noise cancellation
and the speaker circuitry will be bypassed. In this mode the
speaker acts as a normal extension speaker.
To check the operation tune the radio into a band where there is
a lot of background noise (turn the squelch off). Turn on the
NEMS , the red led will illuminate in the switch.
The level of noise will drop after a short delay as the DSP adapts
to the noise present on the audio signal. Turn the switch off and
the noise will return.
If the
NEMS doesn’t operate as expected the please turn to
section 5 - troubleshooting.
Note:
If a slight pop is heard when the speaker is switched on this is
nothing to worry about and is normal.
There is no need to turn the noise cancelling off if the noise
levels reduce, as the DSP is fully adaptive and will learn the new
noise conditions, and will not interfere with the audio signal.
3.2 Remote operation.
If the NEMS on/off switch is inaccessible due to the chosen
mounting position it is possible to install another switch in the
power line. Leave the
NEMS power switch on, and control the
power and noise cancellation with this new switch.