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App-14
IM 701210-06E
Appendix 5 User-Defined Computation
Digital Filter
Type
Type
Bandwidth
Gaussian
LowPass
Sharp
LowPass/HighPass/BandPass
IIR (Butterworth)
LowPass/HighPass/BandPass
Filter Order
See the following table for the filter orders
2%
5%
10%
20%
30% (Cutoff)
Gauss
LowPass
49
21
9
5
5
Sharp
LowPass
88
36
18
9
8
HighPass
159
65
33
17
13
IIR
LowPass
4
4
4
3
2
HighPass
4
4
4
4
3
Filter Characteristics
Filter
Pass-band
Attenuation Slope
Attenuation at the
Phase
Ripple
Stop-band
Gauss
0dB
1
–
Linear phase
Sharp
±
0.3 dB
–40 dB at 1 oct (Lowpass),
–40 dB
Linear phase
–40 dB at –1oct (Highpass)
IIR
0 dB
–5 dB at 1/6 oct (Lowpass),
Not linear phase
–20 dB at –1 oct (Highpass) –
1. For Gaussian filter : –3.0
×
(f/fc) 2 dB (f : frequency, fc : cutoff frequency)
Frequency Characteristics of Filters
f: Sampling frequency (Hz)
Gauss(Cutoff: 10%)
Sharp(Low Pass, Cutoff: 10%)
IIR(Low Pass, Cutoff: 10%)
Note
The higher the filter order the longer it takes for computation.