Temporal masking depth is less than envelope modulation depth due to postmasking

Evidence

The temporal variation of the temporal masking pattern can be described by the magnitude LJ.L, which represents the level difference between the maxima and the minima in the temporal masking pattern. This so-called temporal masking depth, LJ.L, should not be confused with the modulation depth, d, of the masker’s envelope; the masking depth LJ.L of the temporal masking pattern is smaller than the modulation depth d of the masker’s envelope due to postmasking. — Professor Dr.-Ing. Hugo Fastl, Professor Dr.-Ing. Eberhard, Psychoacoustics- Facts and Models, 1423

The maximum of the masking pattern shows up at a delay relative to the masker period of 0, the minimum at a delay of 0.5. The difference between maximum and minimum, called the temporal masking depth, clearly decreases with increasing modulat.ion frequency. This means that as a function of modulation frequency, the temporal masking pattern shows a low-pass characteristic, whereas fluctuation strength shows a band-pass characteristic. — Professor Dr.-Ing. Hugo Fastl, Professor Dr.-Ing. Eberhard, Psychoacoustics- Facts and Models, 1428

A basic feature of the model of fluctuation strength, namely the masking depth of the temporal masking pattern, can be illustrated in Fig. 10.9. The temporal envelope of a sinusoidally amplitude-modulated broad-band noise is indicated by the hatched areas. The different curves represent the temporal masking patterns for the different modulation frequencies indicated. The maximum of the masking pattern shows up at a delay relative to the masker period of 0, the minimum at a delay of 0.5. The difference between maximum and minimum, called the temporal masking depth, clearly decreases with increasing modulat.ion frequency. This means that as a function of modulation frequency, the temporal masking pattern shows a low-pass characteristic, whereas fluctuation strength shows a band-pass characteristic. — Professor Dr.-Ing. Hugo Fastl, Professor Dr.-Ing. Eberhard, Psychoacoustics- Facts and Models, 1428

Categorization

• DEFINE: Precisely distinguishes temporal masking depth from modulation depth, a definitional subtlety central to the model.
• XREF: Connects to how a low-pass masking characteristic is transformed into a band-pass fluctuation-strength characteristic — relevant to filter models in signal processing. — connects to: Post masking outlasts premasking and asymmetrically distorts threshold patterns. — Professor Dr.-Ing. Hugo Fastl, Professor Dr.-Ing. Eberhard, Psychoacoustics- Facts and Models, 547; Masking effectiveness depends on masker-signal power, frequency, and timing relationships — Jennifer Lentz, Psychoacoustics- Perception of Normal…, 461
• corroborated: 4 independent passages support this claim — Professor Dr.-Ing. Hugo Fastl, Professor Dr.-Ing. Eberhard, Psychoacoustics- Facts and Models, 1423; Professor Dr.-Ing. Hugo Fastl, Professor Dr.-Ing. Eberhard, Psychoacoustics- Facts and Models, 1428

Broader Connections

• Post masking outlasts premasking and asymmetrically distorts threshold patterns. #corroborates (0.80) — Professor Dr.-Ing. Hugo Fastl, Professor Dr.-Ing. Eberhard, Psychoacoustics- Facts and Models, 547
• Masking effectiveness depends on masker-signal power, frequency, and timing relationships #expands (0.75) — Jennifer Lentz, Psychoacoustics- Perception of Normal…, 461