Harshness

The roughness is a psycho-acoustic sensation size that is perceived especially in frequency and amplitude modulated Schallen and their value is determined by listening tests. The roughness of a sound ( sound) will be given asper in the unit. A Asper corresponds to the roughness of a 100% modulated with 70 Hz 1 kHz sine tone at a sound pressure level of 60 dB SPL. Examples of sounds which cause the roughness, the buzzing or humming sound of a flying beetle and an electric or piston engine, and amplitude- or frequency-modulated tones with modulation frequencies between about 30 and 300 Hz are This sensation can be modeled by a complex calculation methods. A method developed for this is the perception of realistic noises after quite well.