Acum
| unit | |
|---|---|
| Surname | Acum |
| size | |
| Unit symbol | acum |
| Formula symbol | |
| Named after | sharp ( lat. ) |
The Acum (Latin for "sharp"), unit symbols acum , is a unit of measure for the psychoacoustic sharpness of an auditory event .
definition
A narrow-band noise of 920 Hz to 1080 Hz at a sound pressure level of 60 dB serves as reference sound with a sharpness of 1 acum .
The sharpness of other noises is determined by ratio scaling: a sound whose sharpness is perceived as half as sharp as the reference sound has a sharpness of 0.5 acum.
A calculation method is specified in ISO 532.