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NDAS-N. User Manual.
68
Table 14.1. Decimation coefficients cascades:
Table 14.2. FIR filter characteristics
Parameter \ Filter
2
4
8
10
Number
of
coefficients 256 384 384 384
Stopband attenuation, dB
-173
-172
-172
-171
Cutoff frequency
(normalized, -3dB level)
0.455 0.441 0.384 0.355
Passband
ripple,
mdB 0.001 0.001 0.001 0.001
Table 14.3. FIR filter characteristics summary
Target sample
rate, SPS
Cutoff
frequency, Hz
Stopband start,
Hz
Passband
ripple, mdB
Stopband
attenuation, dB
8000
3640 3984 1 -173
4000
1820 1992 1 -173
2000
910 996 1 -173
1000
455 498 2 -173
500
227.5 249 3 -173
250
113.75 124.5
3
-173
125
91 99.6 3 -173
100
45.5 49.8 3 -173
50
9.1 9.96 4 -173
10
0.91 4.98 4 -173
1
0.455 0.498 5 -173
Sample rate \
Stage
1 2 3 4 5 Overall
decimation
factor
8000
SPS 2 - - - - 2
4000
SPS 2 - - - - 2
2000
SPS 2 - - - - 2
1000 SPS
2
2
-
-
-
4
500
SPS 2 2 2 - - 8
250
SPS 2 4 2 - - 16
125
SPS 2 8 2 - - 32
100 SPS
2
10
2
-
-
40
50 SPS
2
10
2
2
-
80
10 SPS
2
10
10
2
-
400
1
SPS 2 10 10 10 2 4000
