唢呐的声频谱和音管的计算

Sound spectrum and calculation of the bore of Chinese Woodwind Instrument Suo-na

本文给出唢呐的声学结构，并用圆锥复合管模拟音管。音管和双簧片哨声容的共振决定声音的基频。文中给出音管输入导纳和传递函数的计算方法。计算表明，唢呐声中基波主要由指孔辐射，而高次谐波主要由碗开口辐射。声频谱包络的特点和音管的传递函数有相应的关系。

The acoustic model of Suo-na and simulation of the bore by compound conical pipes are presented in this paper. Fundamental frequency of Suo-na sound is determined by the resonance between the acoustic compliance of reed space and the bore. Calculatoins of bore show that the acoustic power is radiated mainly from finger holes for fundamental wave and mainly from the open end of bell for higher harmonics. The envelope of sound spectrum is related to the transfer function of bore.