AN AUTOMATIC DESIGN METHOD FOR THE ACOUSTIC PARAMETERS OF TELEPHONE-HANDSETS REDUCING THE EFFECTS OF LEAK BY MONTE-CARLO METHOD

When we use a telephone-handset, the frequency response of the telepho ne-earphone becomes degraded because of the leak through the slit betw een the ear and the earphone. Consequently, it is very important to es tablish the design method of the telephone-handset which reduces the e ffect of leak. No one has tried to design the telephone-handset to red uce the effect. We are the only ones to have proposed an automatic des ign method by nonlinear optimization techniques. However, this method gives only one set of the acoustic parameters aiming at a certain spec ific target frequency response, and therefore lacks flexibility in the actual design problem. On the other hand, the design method proposed in this paper, which uses Monte-Carlo method, gives an infinite number of sets of acoustic parameters that realize infinite frequency respon ses within the target allowable region. As these infinite number of se ts become directly the design ranges of acoustic parameters, the propo sed method has the flexibility that any set of the acoustic parameters belonging to the design ranges guarantees the corresponding response to be within the target allowable region, and at the same time reduces the effect of leak. This flexibility is advantageous to the actual de sign problem.