NVGate filter formula appendix

Digital Filters

These filters use the Infinite Impulse Response. You will find below the description 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:

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