Page 9
2.3
Pin functions.
The basic operation of the NEDSP pins are described
below. More detailed descriptions can be found later in
this manual.
Pins 1-3 DSP filter level set.
These pins allow remote setting of the noise cancellation
level. If these pins are used, then remove the preset
jumpers JP1 - JP3 from the PCB.
Pin 5.
Supply voltage.
Supply voltage 5-15VDC
Pin 7
0V
0V pin.
Pin 8
Noise cancellation on/off
Connecting this pin to 0V inhibits the noise cancellation.
Leave this pin floating to enable noise cancellation.
Pin 9
Audio input.
Audio signal to be processed.
Pin 10
Audio out
DSP processed signal out from the module.
For optimum performance, keep all leads as short as
possible. Use screened leads for the audio signal.
Page 16
5.
A
pplication Notes.
5.1
Noise cancellation On/Off indication.
Figure 7. Red/Green LED indication of noise cancellation.
In the above example a tricolour LED (or separate Red
and Green LEDs) are used to give a visual indication of
the noise cancellation mode. The green LED will
illuminate when the noise cancellation is on, and the red
when off.
NEDSP 1061
0V
7
Noff
8
+V
0V
Red
Green
R1
R2
Noise
cancellation
Off
DPDT
switch
