Computerized loudness models track the 1 kHz tone within 2 percent

Evidence

The program shows a very good approximation of the loudness function for the 1 kHz standard tone; it is within 2% from 0.02 to 150 sone. It is shown in Fig. 16.2 together with the corresponding functions for uniform exciting noise (cf. Fig. 8.4). — Professor Dr.-Ing. Hugo Fastl, Professor Dr.-Ing. Eberhard, Psychoacoustics- Facts and Models, 1750