An 11-category loudness scale decomposes into 10 parameterized boundary curves.

Evidence

The MCPF curves are logistic functions that can be parameterized. A four-parameter logistic function was selected to represent each of the curves of the MCPF. For our 11-category CLS scale, each MCPF, consists of 10 category-boundary curves. Thus, the modeling implementation has 10 sets of parameters that define the 10 curves of each MCPF. — Dijk, Pim van, Physiology, Psychoacoustics and…, 2526

Categorization

• DEFINE: Explains the parameterization scheme: 4-parameter logistic curves, with 10 category boundaries for an 11-category scale.