スピーカシステムの振幅歪解析法

概要

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This paper describes a new method of the analysis of the non-linear distortion of loudspeaker system including enclosure. The factors which contribute heavily to the distortion of the displacement of loudspeaker are the non-linear characteristics of the suspension system and the relationship between the driving signal and the magnetic force. The above problem is solved as follows:1)The loudspeaker system is represented by the impedance type analogous circuit. The input current is time-dependent sinusoidal signal and the consequent transient response is stored, from which the distortion is obtained by using FFT technique. 2)The effective flux density and the force are supposed to be cubic polynomials of the displacement. 3)To obtain the transient response, numerical integration algorithm is used, where the nodal equation for the equivalent circuit expressed by companion model(linear resistance model)is solved by iterative method. The distortion analysis of the bassreflex loudspeaker system is shown in detail. In this case the maximum number of iterations is50. The number of waves is from16at10Hz to72at200Hz. The time required for computation is about8minutes with VAX-11/780computer. The computed distortion level agrees with the measured distortion level very well.
社団法人日本音響学会の論文
1983-03-01