Wide frequency modulation of noise cutoff greatly amplifies perceived pitch strength

Evidence

Results displayed in Fig. 5.39 suggest that the pitch strength of low-pass noise is hardly influenced by small (up to ±40 Hz) sweeps of the cutoff frequency. On the other hand, for large frequency deviations with instantaneous cutoff frequencies varying between 800 and 1200 Hz, pitch strength is by a factor of 2.4 larger than the pitch strength of a stationary low-pass noise with 1 kHz cutoff frequency. — Professor Dr.-Ing. Hugo Fastl, Professor Dr.-Ing. Eberhard, Psychoacoustics- Facts and Models, 859

Categorization

Category: Factual Claims

• QUESTION: Why would a wide ±200 Hz sweep enhance pitch 2.4x while ±40 Hz does nothing — does this relate to the creation of discernible spectral cues beyond just variation?

Related

• Large cutoff-frequency sweeps boost low-pass noise pitch strength 2.4-fold (similarity 0.95)
• Raising low-pass noise level measurably raises its perceived pitch (similarity 0.88)
• Steep low-pass noise slopes yield pitch strength far below that of a pure tone (similarity 0.87)
• Even very steep low-pass noise slopes produce pitch far weaker than a pure tone. (similarity 0.86)
• Steep-filtered noise produces pitch matching the filter’s cut-off frequency (similarity 0.85)
• Slow amplitude modulation reduces pure tone pitch strength by ten to twenty percent (similarity 0.85)
• Narrower noise bandwidth raises pitch strength while higher center frequency also raises it (similarity 0.84)
• Low-pass noise is heard at a pitch matching its cut-off frequency (similarity 0.84)
• Raising intensity lowers pitch at low frequencies but raises it at high frequencies. (similarity 0.84)
• Noise bandwidth changes sharpness dramatically across a wide range (similarity 0.83)
• Noise with a sharp spectral peak is perceived as pitched. (similarity 0.83)
• Higher noise levels reduce sensitivity to cut-off frequency changes (similarity 0.83)
• Pitch strength varies independently of perceived pitch height (similarity 0.83)
• Pitch strength rises only modestly with level while loudness explodes. (similarity 0.83)
• Amplitude-modulated broadband noise yields only faint pitch despite flat spectrum (similarity 0.82)