Figure 7.

Dependence of normalized mean-squared error on frequency bin. (A) Normalized mean-squared error e_f in the mapping function g_f for each frequency bin averaged over all digits (black curve) and the normalized power spectral density of digits “1” to “Z” (light yellow to green curves). (B) Normalized mean-squared error e_f normalized by the power in each frequency bin plotted for each individual digit. The black curve shows the average over all digits. Data is extracted from the male speakers and the software cochlea model (10 trials). Ratio of neighboring frequency bins is 1.029. Minimum frequency is 180 Hz, maximum frequency is 7240 Hz. Bin 10 corresponds to a frequency around 240 Hz, bin 40 to a frequency around 571 Hz, and bin 60 to a frequency around 1017.5 Hz.