An estimation of acoustic parameters of piezoelectric telephone by Monte Carlo method
Yoshinobu Kajikawa, Yasuo Nomura, Juro Ohga · Electronics and Communications in Japan (Part III Fundamental Electronic Science) · 1995
Abstract A problem in the telephone handset is that there is no design formula that can relate the values of the parameters in the acoustic equivalent circuit (acoustic parameters) of the earphone system directly to the shape (dimensions) of the actual handset. As a result, the design of the handset has been made very difficult. to derive such a formula, the values of the acoustic parameters must be estimated accurately from the actual measurement of the handset. Previously, the authors have estimated that acoustic parameters, using the nonlinear optimizatoin technique, but a problem is still left that the number of parameters that can be simultaneously estimated is limited. This paper tries to solve this problem and proposes and estimation technique using the Monte Carlo method, which can also realize a high estimation accuracy. In the proposed method, an allowable range for the actual response is defined and the acoustic parameters are estimated by modifying the upper and the lower limits of each acoustic parameter so that the response stays within the allowable range. The proposed method has the advantages that the number of parameters to be estimated is not limited, a good agreement can be realized with the actual response, and the decision can be made without intuition. the approach also provides a useful means for the design of the whole system. Although this paper discusses the estimation for the piezoelectric telephone handset, the proposed method can be applied effectively to any type of telephone handset.