NVGate filter formula appendix
B. Appendix - Digital Filters
These filters use the Infinite Impulse Response. You will find below the description of NVGate digital filters
B.1 "A" Weighting Filter
B.2 "B" Weighting Filter
B.4 300 Hz Filter
B.5 1 kHz Filter
B.6 User Low Pass Filter
Example with a 500 Hz cut-off frequency:
B.7 User High Pass Filter
Example with a 500 Hz cut-off frequency:
B.8 User Band Pass Filter
Example with a 1100 Hz low cut-off and 2000 Hz high cut-off frequencies:
B.9 User Band Stop Filter
Example with a 1100 Hz low cut-off and 2000 Hz high cut-off frequencies:
C. Spectral Weighting Filters
C.1 "A" and "D" Related Filters
C.1.1 "A" Spectral Weighting Filter
C.1.2 "1/A" Spectral Weighting Filter
C.1.3 "D" Spectral Weighting Filter
C.1.4 "A*D" Spectral Weighting Filter
C.1.5 "1/(A*D)" Spectral Weighting Filter
C.1.6 "A*D*200-5000 Hz" Spectral Weighting Filter
3.2 ISO2631 Filters
The Wc, Wd and Wk spectral weighting filters comply with the ISO 2631-1 (2nd
edition 1997-05-01) and the UIC513R standards.
The Wc, Wd and Wk spectral weighting filters are based on the limit bandwidth Wa
spectral weighting filter:
3.2.1 "Wc (ISO2631)" Spectral Weighting Filter
"Wd (ISO2631)" Spectral Weighting Filter
3.2.3 "Wk (ISO2631)" Spectral Weighting Filter
3.3 BSI6841 and BSI6842 Filters
The Wb, Wc, Wd, We, Wf and Wg spectral weighting filters comply with the
BSI6841 standard.
The Wh spectral weighting filter complies with the BSI6842 standard.
The Wb, Wc, Wd, We, Wf, Wg and Wh spectral weighting filters are based on the
limit bandwidth Hb spectral weighting filter:
C.3.1 Wb (BSI6841) Spectral Weighting Filter
C.3.2 Wc (BSI6841) Spectral Weighting Filter
C.3.3 Wd (BSI6841) Spectral Weighting Filter
C.3.4 We (BSI6841) Spectral Weighting Filter
C.3.5 Wf (BSI6841) Spectral Weighting Filter
C.3.6 Wg (BSI6841) Spectral Weighting Filter
C.3.7 Wh (BSI6842) Spectral Weighting Filter
ISO5349 Filter
W(f)= K.f
if (f < or = 16) then K = 1.0 or else K = 16/f
C.5 W.B.Combined (ISO6954) Spectral Weighting Filter
1. W.B.Combined based on acceleration as input quantity
2.
2. W.B.Combined based on velocity as input quantity
