多重共振系の周波数特性の制御に関するモデル的考察

抄録

In most acoustic instrument design in the past, attempts were made to obtain flat frequency response using the equivalent relationship of electro-mechano-acoustical systems. But nowadays, this method has been completed and it seems diffcult to improve the behavior of the instrument remarkably by this technique. In view of this, development of a new design method is being looked forward to. The application of the Multi-Resonance System is considered to be one of the feasible technique for this purpose. To utilize such technique, it is necessary to develop an effective means for controlling the fluctuations of frequency response. In this paper, a method of control by adjustment of damping resistance value is discussed by using some equivalent circuits. There are two kinds of damping resistance ; branch resistance and common resistance. As the branch resistances become larger, the peak levels decrease monotonically but the dip level initially increases to a maximum value and then drops. The average level decreases to about -3dB when the peak and dip levels coincide. However, when the common resistance becomes larger, the peak level decreases but there is no change in the dip level.