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1. Introduction
The NEDSP1061-KBD is a modular solution to noise
reduction. It incorporates DSP technology to provide up
to 35dB of noise cancellation. The module is controlled
by a single pushbutton with LED indication for ease of
use.
1.1 NEDSP1061-KBD module features:
n Fully adaptive to changing noise environments
n Input and output level controls
n Input overload indication
n Virtually no distortion to speech signal
n Up to 35dB of noise cancellation
n 4 levels of noise reduction
n 5 – 15V supply range
n 4.6dB on board gain
n Single key operation of all functions
n LED indication of DSP level and status
n Small size 26mm x 37mm
1.2 Limitations.
This module is designed to pass speech. Other signals
such as data and music will to some degree pass
through, but the integrity of these signals
cannot be guaranteed.
This module is designed to be placed in a low level audio
path only. The module will not drive a loudspeaker or
other high power load (see bhi amplified DSP module).
The unit is single channel (mono).
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Noise cancellation on/off.
Press and release the button and the led will extinguish,
and the noise cancellation will be activated. A short beep
will acknowledge the key press.
Changing the filter level.
Hold down the button. The led will flash the filter level,
and if the button is held it will step through all the levels.
When the desired level has been reached release the
button. This new value will be stored in the modules’
memory and will be the default setting the next time the
unit is powered up.
6.3. Demonstration mode.
The NEDSP1061-KBD module features 2 preset
demonstration modes. These demonstrate the noise
cancellation abilities of the NEDSP1061 module.
6.3.1 Demonstration 1:
Hold down the button and switch on the equipment. After
a short time the unit will emit a 2 tone beep. Release
the button. The unit is now in demonstration mode 1.
The module will switch the noise cancellation on for 1.5
seconds, then off for 1.5 seconds. It will then move onto
the next level and repeat this continuously through all 4
levels.
This mode a particularly effective when the equipment
is just receiving static, as it demonstrates the attenuation
of white noise at all the levels.
Alternatively tune the equipment into a good quality FM
speech broadcast. This demonstration shows how little
the DSP alters the speech, at any of the levels.
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