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Calculates the sound using the more common A, B and C filter corrections used.


Filter Frequency
63 125 250 500 1000 2000 4000 8000 Summa


Shows how different filters affect a few commonly occurring sound frequencies. The filters are a way to make adjustments to the human ear sensitivity.


Refers to the unfiltered sound also called because the sound which it assumes when you then put the filter on top to mimic the ear.


A-weighting filter is the most commonly used, and is applicable for normal frequencies and ljustyrkor. A-weighting attenuates the low frequencies and amplifies the medium, A-weighted filter is primarily intended to be used in the measurement of the level sounds


B-weighted filter is supposed to handle the between loud sounds but these B-weighted filter is used rarely lower.


C-weighted filter is for the loudest sounds sound filter with a C-weighting is used mainly for sound with strong and low frequencies such as fan noise but is also used for short, sharp beeps mean when the C-weighted filters do not suppress the low frequencies in contrast to the A-weighted filter.

The decibel (dB)

is a logarithmic measure that indicates a relation to a reference value. Commonly used in sound determinations, but also occur in other areas. The basic unit is actually Bel but used almost exclusively with the prefix deci ie 10.1 Bel.


Displays the weighted sum of the input frequencies for each row.


Sound summation:: Sound summation: