NVGate filter formula appendix

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Digital Filters

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

. 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

 

I===SO5349 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

 
 
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