Slow amplitude modulation reduces pure tone pitch strength by ten to twenty percent

Evidence

However, continuous variations in parameters of sounds may clearly influence their pitch strength. For example, amplitude modulation of pure tones with low modulation frequencies (4Hz) can reduce their pitch strength by some 10 to 20%. This decrease in pitch strength holds also true for AM-tones partially masked by broadband noise. — Professor Dr.-Ing. Hugo Fastl, Professor Dr.-Ing. Eberhard, Psychoacoustics- Facts and Models, 852

So far the pitch strength of different sounds separated by pauses has been described. However, continuous variations in parameters of sounds may clearly influence their pitch strength. For example, amplitude modulation of pure tones with low modulation frequencies (4Hz) can reduce their pitch strength by some 10 to 20%. This decrease in pitch strength holds also true for AM-tones partially masked by broadband noise. — Professor Dr.-Ing. Hugo Fastl, Professor Dr.-Ing. Eberhard, Psychoacoustics- Facts and Models, 852

Categorization

• corroborated: 3 independent passages support this claim — Professor Dr.-Ing. Hugo Fastl, Professor Dr.-Ing. Eberhard, Psychoacoustics- Facts and Models, 852
• XREF: connects to: Noise-type sounds have far weaker pitch strength than pure or complex tones.; Pitch strength of amplitude-modulated tones depends critically on the carrier-to-modulation frequency ratio