A 1 dB level change anchors the model of just-noticeable slow variations.

Evidence

The filled square shown in Fig. 7.3 belongs to the broadest possible critical band (3.5 kHz) at the upper end of the audible frequency range, and to a sound level change of 1 dB corresponding to a sinusoidal 4-Hz amplitude modulation of 6%. This level change of 1 dB plays a dominant role in the model for just-noticeable sound variations of slow rate. — Professor Dr.-Ing. Hugo Fastl, Professor Dr.-Ing. Eberhard, Psychoacoustics- Facts and Models, 1031

Categorization

• QUESTION: This 1 dB slow-variation anchor recurs through the models — worth tracking how it is reused across later chapters.