Fluctuation strength is predictable from excitation patterns

Evidence

This result can be taken as an indication that fluctuation strength of modulated sounds can be described on the basis of the corresponding excitation patterns. — Professor Dr.-Ing. Hugo Fastl, Professor Dr.-Ing. Eberhard, Psychoacoustics- Facts and Models, 1405

Categorization

Category: Causal Relationships

Related

• Modulation fluctuation strength is governed by excitation patterns (similarity 0.92)
• Fluctuation strength requires at least 3 dB modulation depth before it rises (similarity 0.86)
• A 40-dB level rise increases fluctuation strength by a factor of roughly 2.5 (similarity 0.84)
• Periodic amplitude fluctuations are perceived as stronger than equivalent random fluctuations. (similarity 0.84)
• Amplitude-modulated loudness directly increases perceived fluctuation strength (similarity 0.84)
• Slow sound-level changes are heard as fluctuation and fast ones as roughness (similarity 0.83)
• Raising sound pressure by 40 dB roughly triples perceived fluctuation strength (similarity 0.83)
• Periodic modulation enhances perceived fluctuation strength beyond random noise (similarity 0.83)
• Excitation patterns smooth the spectrum, blurring harmonic and formant detail the acoustic signal carries (similarity 0.82)
• Above 250 Hz modulation, frequency-modulated sounds behave as steady state. (similarity 0.82)
• Amplitude modulation faster than the tone’s own steady pitch is heard as pitch change (similarity 0.82)
• Excitation slopes are steeper toward lower frequencies than higher ones (similarity 0.81)
• Pitch shifts with intensity but individual listener variability is large. (similarity 0.80)
• The excitation pattern’s upper slope changes nonlinearly with level, unlike the main peak (similarity 0.80)
• Narrower noise bandwidths produce slower amplitude fluctuation rates (similarity 0.80)