[AUDITORY] Question on Daniel & Weber (1997) roughness model

["Stephen McAdams, Prof." <stephen.mcadams@xxxxxxxxx>]

Dear colleagues,

I have a colleague who is trying to implement the Daniel & Weber roughness model in code (from their 1997 Acta Acustica paper).

He started to implement it, but ran into some small roadblocks, mainly involving functions that depend on visual plots for their values. For example, a_0(f) in the last paragraph of p. 116 appears to be defined only by a plot from Zwicker and Fastl, figure 8.18 in the 3rd ed. Is there an analytic model for it somewhere, or at least a table of values? Likewise for the weighting functions H_i, defined graphically on p. 117, and for g(z_i) on p. 118, defined graphically in Aures 1985, p. 277.

Many thanks for your help,
Stephen McAdams