Bosch DDU S2 Plus - Page 90

Digital filter details
DDU 8 uses A/D converter oversampling and digital filtering to recording rate.
Digital filters eliminate ‘out‐of‐band’ noise
Cut‐off frequency automatically adjusted to recording rate
Example:
▪ 100 Hz recording rate (10 ms)
▪ <40 Hz pass band (>99 %)
▪ >50 Hz stop band (<1 %)
Linear phase – no signal distortion
0
500
1000
1500
2000
2500
3000
-2
-1.5
-1
-0.5
0
0.5
1
1.5
2
Abtastwerte (r oh)
Wert
10000Hz Abtastrate
0
5
10
15
20
25
30
-1.5
-1
-0.5
0
0.5
1
1.5
Abtastwerte (gefiltert)
Wert
100Hz Abtastrate
0
5
10
15
20
25
30
-1.5
-1
-0.5
0
0.5
1
1.5
Abtastwerte (dezimiert)
Wert
100Hz Abtastrate
Sensor signal with noise
Recorded signal 100Hz
(unfiltered)
Recorded signal 100Hz
(filtered)
10.3.5
10 | Analog and Frequency Inputs
90 / 136 DDU S2 PLUS Manual Bosch Motorsport