frequency weighting
In order to be able to evaluate the sound level as it is perceived by the human ear, the frequency response curve of the hearing characteristics is simulated during sound level measurements. This applies in particular to sound level measurements in homes and at the workplace.
The frequency weighting of sound level measurements is intended to limit or completely avoid noise and noise pollution that is hazardous to health. Sound level meters know three weighting functions that reflect certain frequency response characteristics. The A-Weighting, B-Weighting and C-Weighting, which are expressed in dB(A), dB(B) and dB(C). These reappear in workplace regulations to protect workers. In addition to these three frequency response curves, there is also a flat frequency response curve in the form of Z-Weighting, which permits maximum level deviations of +/- 1.5 dB between 10 Hz and 20 kHz.