The Sonocat is a multifunctional spherical microphone able to measure Sound Pressure Levels (SPL) in stationary sound fields. Three common types of frequency weighting are provided to adjust the level according to the situation:

– A-weighting : Frequency weighting based on the relative loudness perceived by the human ear at a sound loudness level of 40 phon.

– C-weighting : Frequency weighting that is more appropriate for higher loudness levels.

– Z-weighting : Frequency weighting at an equal level (0 dB) for all frequency bands (i.e. no frequency weighting).

The overall Sound Pressure Level is computed according to the IEC-61672-1 standard.