Page 7
2. Module description
Figure 2. NEDSP1061 block diagram
Output level
set
Input level
set
Analogue to
Digital conversion
Digital to analogue
conversion
BCD
DSP level select
Xtal
Clock generator
On Board
Jumpers
DSP core
10
9
1
2
3
8
7
3.3V
3.3V regulator
Polarity
protection
PCB
Connections
Internal
pull up
resistors
N0
N1
Vin
0V
N2
Noff
In
Out
5
2.1
Block diagram.
The NESDP1061 module has the facility to be preset, or
adjusted during operation. Digital inputs control the
functions. These incorporate internal pull up resistors,
so they can be left floating when not in use.
The audio signals into and out of the module are capacitor
coupled.
The on board voltage regulator allows the module to be
used with a wide range of input voltages, but to keep the
power dissipation (and heat) down it is advisable to use
as low as possible supply voltage. The power supply
input is reverse polarity protected.
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NEDSP 1061
N0
1
N1
2
N2
3
0V
7
micro controller
Figure 10. Control using a microcontroller
The module can be controlled with a microcontroller. As
the DSP employs internal pull ups, it is not necessary to
drive the microcontroller port pins high, they can be
placed in a high impedance state.
NEDSP 1061
N0
1
N1
2
N2
3
micro controller
a
b
c
d
e
f
g
display
BCD to
7 segment
decoder
CD4511
A
B
C
0V
Seven segment LED
display showing
DSP filter level
(note: displays 0 - 7)
Keyboard
Noff
8
Figure 11. Control using a microcontroller with display
and keyboard.
The following example employs a 7 segment display and
keyboard. Noise on/off is also controlled by the
microcontroller. In the diagram 3 buttons are used, up
level, down level and DSP on/off.
