Band-pass noise audibly self-modulates far above its threshold

Evidence

For band-pass noise, we have an audible self-modulation of the sound. This self-modulation is far above threshold, which means that detectors that might signal the modulation are already responding. Such a situation also occurs when a tone burst is compared with another tone burst of different amplitude or frequency and the tone bursts are separated by a pause; the subject has to say whether there is an audible difference between the two bursts. In this case, there is also a strong change in amplitude or level that leads to the fact that the detectors have already responded. — Professor Dr.-Ing. Hugo Fastl, Professor Dr.-Ing. Eberhard, Psychoacoustics- Facts and Models, 1127

Categorization

• QUESTION: Why does band-pass noise exhibit audible self-modulation? This seems to anticipate a limitation of the basic detection model worth understanding.