Fast amplitude modulations within a critical band produce roughness perception

Evidence

Roughness (Daniel and Weber, 1997; Fastl and Zwicker, 2007) is a psychoacoustic quantity which is caused by relatively fast amplitude modulations (15–300 Hz) that take place for stimuli within the range of a critical band. For example, narrowband noise always sounds slightly rough, since there are random amplitude fluctuations in it. — Ville Pulkki, Matti Karjalainen, Communication Acoustics- An…, 1237

Categorization

• DEFINE: Defines roughness as a psychoacoustic quantity caused by 15-300 Hz modulations inside a critical band.
• corroborated: 3 independent passages support this claim — Ville Pulkki, Matti Karjalainen, Communication Acoustics- An…, 1237
• XREF: connects to: Low modulation frequencies produce fluctuation sensation while higher ones produce roughness — Professor Dr.-Ing. Hugo Fastl, Professor Dr.-Ing. Eberhard, Psychoacoustics- Facts and Models, 1381; Fluctuation strength depends on the critical-band interval a frequency sweep traverses; Periodic modulation enhances perceived fluctuation strength beyond random noise (+13 more)

Broader Connections

• Critical bandwidth marks the perceptual shift from rough to smooth tone resolution #qualifies (0.85)
• Perception of two tones progresses from beats to roughness to smoothness #expands (0.82) — David M. Howard, Jamie Angus, Acoustics and Psychoacoustics, 575
• Perceived dissonance arises when nearby harmonics fall within critical bandwidth #contradicts (0.70)