NVGate filter formula appendix

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Digital Filters

These filters use the Infinite Impulse Response. You will find below descriptions of NVGate digital filters

"A" Weighting Filter

Filter 01.png

Filter 02.png

"B" Weighting Filter

Filter 03.png

Filter 04.png

300 Hz Filter

Filter 05 1024.png

Filter 06 1024.png

1 kHz Filter

Filter 07 1024.png

Filter 08 1024.png

User Low Pass Filter

Example with a 500 Hz cut-off frequency:

Filter 09 1024.png

Filter 10 1024.png

User High Pass Filter

Example with a 500 Hz cut-off frequency:

Filter 11 1024.png

Filter 12 1024.png

User Band Pass Filter

Example with a 1100 Hz low cut-off and 2000 Hz high cut-off frequencies:

Filter 13 1024.png

Filter 14 1024.png

User Band Stop Filter

Example with a 1100 Hz low cut-off and 2000 Hz high cut-off frequencies:

Filter 15 1024.png

Filter 16 1024.png

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

Filter 17.png

Filter 18 1024.png

"1/A" Spectral Weighting Filter

Filter 19.png

"D" Spectral Weighting Filter

Filter 20.png

Filter 21.png

"A*D" Spectral Weighting Filter

Filter 22.png

"1/(A*D)" Spectral Weighting Filter

Filter 23.png

"AD200-5000 Hz" Spectral Weighting Filter

Filter 24.png

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:

Filter2nd 01.png

"Wc (ISO2631)" Spectral Weighting Filter

Filter2nd 02.png

Filter2nd 03.png

"Wd (ISO2631)" Spectral Weighting Filter

Filter2nd 04.png

Filter2nd 05.png

"Wk (ISO2631)" Spectral Weighting Filter

Filter2nd 06.png

Filter2nd 07.png

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:

Filter2nd 08.gif

Filter2nd 09.png

Wb (BSI6841) Spectral Weighting Filter

Filter2nd 10.png

Wc (BSI6841) Spectral Weighting Filter

Filter2nd 11.png

Wd (BSI6841) Spectral Weighting Filter

Filter2nd 12.png

We (BSI6841) Spectral Weighting Filter

Filter2nd 13.png

Wf (BSI6841) Spectral Weighting Filter

Filter2nd 14.png

Wg (BSI6841) Spectral Weighting Filter

Filter2nd 15.png

Wh (BSI6842) Spectral Weighting Filter

Filter2nd 16.png

ISO5349 Filter

W(f)= K.f

if (f < or = 16) then K = 1.0 or else K = 16/f

Filter2nd 17.png

W.B.Combined (ISO6954) Spectral Weighting Filter

W.B.Combined based on acceleration as input quantity

Filter2nd 18.png

2.

Filter2nd 19.png

W.B.Combined based on velocity as input quantity

Filter2nd 20.png

Filter2nd 21.png

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