Page 10
2.4
Controls.
The audio level control potentiometers P1 (Audio out),
and P2 (Audio in) provide adjustment to the audio levels
entering and leaving the module.
P1 is factory set near to maximum.
To set the input level correctly, adjust P2 until the
overload led D1 (next to P2) illuminates, then back off
the potentiometer approximately a 1/4 of a turn.
Turning the potentiometers anti clock wise will increase
the levels.
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Table 2. NEDSP1061 Electrical characeristics
2.5
Electrical characteristics.
Page 15
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3
Note:
The DSP has internal pull ups on its inputs, so any cell
in the table containing 3.3V may be left open circuit.
When processing signals with high levels of noise and
high levels of noise cancellation, the signal may sound
slightly strange. This is quite normal with this type of
signal.
4.4
Noise Cancellation On/Off
The module has the provision for remotely enabling and
disabling the noise reduction, while in operation. The
default setting for the module is noise cancellation on.
This may be switched by the use of the noise cancellation
on/off pin (PCB pin 8).
To inhibit noise cancellation, connect this pin to 0V.
To enable noise cancellation leave the pin unconnected.
Table 5. Remote DSP level setting.
Output impedance: Nominally 10k Ohms
Input impedance: 7.5k Ohms typical
