NVGate filter formula appendix
Digital Filters
These filters use the Infinite Impulse Response. You will find below descriptions of NVGate digital filters
"A" Weighting Filter
"B" Weighting Filter
300 Hz Filter
1 kHz Filter
User Low Pass Filter
Example with a 500 Hz cut-off frequency:
User High Pass Filter
Example with a 500 Hz cut-off frequency:
User Band Pass Filter
Example with a 1100 Hz low cut-off and 2000 Hz high cut-off frequencies:
User Band Stop Filter
Example with a 1100 Hz low cut-off and 2000 Hz high cut-off frequencies:
AC dynamical input filter
Spécification of dynamical input AC filter: -3dB Cut-off frequency 0.35 Hz ±10% (first order analog filter)
Spectral Weighting Filters
"A" and "D" Related Filters
"A" Spectral Weighting Filter
"1/A" Spectral Weighting Filter
"D" Spectral Weighting Filter
"A*D" Spectral Weighting Filter
"1/(A*D)" Spectral Weighting Filter
"A*D*200-5000 Hz" Spectral Weighting Filter
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:
"Wc (ISO2631)" Spectral Weighting Filter
"Wd (ISO2631)" Spectral Weighting Filter
"Wk (ISO2631)" Spectral Weighting Filter
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:
Wb (BSI6841) Spectral Weighting Filter
Wc (BSI6841) Spectral Weighting Filter
Wd (BSI6841) Spectral Weighting Filter
We (BSI6841) Spectral Weighting Filter
Wf (BSI6841) Spectral Weighting Filter
Wg (BSI6841) Spectral Weighting Filter
Wh (BSI6842) Spectral Weighting Filter
ISO5349 Filter
W(f)= K.f
if (f < or = 16) then K = 1.0 or else K = 16/f
W.B.Combined (ISO6954) Spectral Weighting Filter
W.B.Combined based on acceleration as input quantity
2.
W.B.Combined based on velocity as input quantity
