VTI Instruments Corp.
APPENDIX B
88
For lower decimated spans, at each stage of 1/2 decimation filter adds 31.5 samples group delay,
and 1/5 decimation filter adds 73 samples delay. The total group delay is shown in the table below.
Model
EMX-4350/4380
EMX-4250/4251
Clock Freq
409600 Hz
524288 Hz
625000 Hz
131072 Hz
204800 Hz
Top Span
6.83594E-05
5.34058E-05
0.0000448
0.000297546
0.00019043
1/5
0.00025
0.00019
0.00016
0.00085
0.00055
½- Stage1
0.000145
0.00063
0.000113
0.00049
0.000095
0.00041
0.00054
0.0020
0.000344
0.00132
Stage2
0.000299
0.00140
0.00023
0.0011
0.000196
0.00092
0.00102
0.0045
0.000652
0.00285
Stage3
0.000607
0.00294
0.000474
0.00230
0.000398
0.0019
0.00198
0.0093
0.00127
0.00593
Stage4
0.00122
0.00601
0.000955
0.0047
0.000800
0.0039
0.0039
0.019
0.0025
0.012
Stage5
0.00245
0.0122
0.00192
0.0095
0.00161
0.0080
0.0078
0.038
0.0050
0.0244
Stage6
0.00491
0.0245
0.00384
0.0191
0.00322
0.0160
0.0154
0.0765
0.0099
0.0490
Stage7
0.00984
0.0491
0.00768
0.0383
0.00645
0.0322
0.031
0.153
0.0197
0.0982
Stage8
0.0197
0.0983
0.0154
0.0768
0.0129
0.0644
0.0616
0.307
0.0394
0.197
Stage9
0.0394
0.197
0.0308
0.154
0.0258
0.1289
0.123
0.615
0.0788
0.394
Stage10
0.0787
0.394
0.0615
0.308
0.0516
0.2580
0.246
1.230
0.158
0.787
Stage11
0.157
0.787
0.123
0.615
0.103
0.5160
0.492
2.460
0.315
1.575
Stage12
0.315
1.575
0.246
1.230
0.206
1.0321
0.984
4.922
0.630
3.150
Stage13
0.630
3.15
0.492
2.461
0.413
2.0643
1.969
9.843
1.260
6.300
Stage14
1.26
6.30
0.984
4.922
0.826
4.1287
3.938
19.687
2.520
12.60
Stage15
2.52
12.6
1.969
9.844
1.652
8.2574
7.875
39.375
5.040
25.20
Stage16
5.04
25.2
3.937
19.69
3.303
16.515
15.75
78.75
10.08
50.40
Table A-2: Group Delay (Seconds)
