Ripple-noise pitch strength grows linearly with log spectral modulation depth beyond 10 dB

Evidence

Peaked ripple noise, the spectrum of which is displayed in Fig. 5.17, can produce a pitch strength that is relatively large, like that of complex tones. … For spectral modulation depths larger than 10 dB, the relative pitch strength increases almost linearly with the logarithm of spectral modulation depth at all pitch ranges considered. — Professor Dr.-Ing. Hugo Fastl, Professor Dr.-Ing. Eberhard, Psychoacoustics- Facts and Models, 823

Figure 5.33 shows the dependence of pitch strength of peaked ripple noise on the frequency of its first spectral peak. The largest pitch strength is produced for peaked ripple noises with narrow peak spacing, i.e. low frequency II. With increasing peak spacing, the pitch becomes fainter and therefore pitch strength decreases. This result is related to the fact that the number of spectral peaks contained within the hearing area decreases with increasing frequency II. — Professor Dr.-Ing. Hugo Fastl, Professor Dr.-Ing. Eberhard, Psychoacoustics- Facts and Models, 829

Categorization

• corroborated: 2 independent passages support this claim — Professor Dr.-Ing. Hugo Fastl, Professor Dr.-Ing. Eberhard, Psychoacoustics- Facts and Models, 823; Professor Dr.-Ing. Hugo Fastl, Professor Dr.-Ing. Eberhard, Psychoacoustics- Facts and Models, 829