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Sound summation

Summarizes a number of different audio sources into a single audio source.

Sound summation

Sound source 1 Lp1= db
Sound source 2 Lp2= db
Sound source 3 Lp3= db
Sound source 4 Lp4= db
Sound source 5 Lp5= db
Sum db

Sound summation

Frequency Sum
63 125 250 500 1000 2000 4000 8000 Filter Filter
Source 1
Source 2


Sound power level

This is a measure of how much power emitted to the environment. The sound power level is in most cases independent of the placement in the room.

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.


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