Large cutoff-frequency sweeps boost low-pass noise pitch strength 2.4-fold

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

When sweeping the cutoff frequency, the relative pitch strength increases. For a modulation frequency of 4 Hz, the pitch strength of the time-varying low-pass noise is by about a factor of 1.4 larger than the pitch strength of a steady-state low-pass noise. — Professor Dr.-Ing. Hugo Fastl, Professor Dr.-Ing. Eberhard, Psychoacoustics- Facts and Models, 854

Categorization

• QUESTION: A threshold-like dependence on frequency deviation suggests a nonlinearity in the pitch-strength mechanism worth chasing.
• corroborated: 3 independent passages support this claim — Professor Dr.-Ing. Hugo Fastl, Professor Dr.-Ing. Eberhard, Psychoacoustics- Facts and Models, 859; Professor Dr.-Ing. Hugo Fastl, Professor Dr.-Ing. Eberhard, Psychoacoustics- Facts and Models, 854
• XREF: connects to: Peaked ripple noise pitch strength stays stable across a wide level range — Professor Dr.-Ing. Hugo Fastl, Professor Dr.-Ing. Eberhard, Psychoacoustics- Facts and Models, 828