Abstract
Assuming A_b is expressed in term of a new function W_b, the articulation index A_b in the case of binaural hearing must be able to be calculated as in the case of monoaural hearing, as follows; A_b=1/p⎰^∞_0W_b{E(α, f)}D(f)df (1) where W_b stands for the component of articulation index of binaural hearing as W_m in the case of monoaural hearing. With the loudness parameter G described in preceding report(1), the function W_b can be estimated; Assuming that the frequency response of transmission system is flat, A_b is estimated by means of the method of loudness parameter; A_b(f)=G{2N_m(f)} (2) and on the other hand, the mean effective sensational level E(α) of this system is estimated by; E∸(α)=⎰^∞_0E(α, f)D(f)df. (3) Plotting the A_b of equation (2) with E∸, W_b is expressed in similar manner as W_m. And this theoretical result proves that it does not contradict the result of experiment.
