Variations on the distribution of the sound pressure levels of partial tones of the Temple Bells with the lapse of periods

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  • 梵鐘における部分音の強度分布の時代的変遷
  • ボンショウ ニ オケル ブブンオン ノ キョウド ブンプ ノ ジダイテキ ヘン

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Abstract

The sounds of 115 Temple Bells are analysed and the sound pressure levels of the fundamental and partial tones are measured. The variations in the structure of sound spectrum concerning the distribution of the sound pressure levels of partial tones with the lapse of periods are clarified. Following results are obtained. The sound pressure level of fundamental tone in the striking sound of bells becomes higher on the average as the periods go by and reaches maximum in the bells of Nanpokucho Period. After that it decreases considerably. In the second partial tone the sound pressure level is higher especially in the bells of Nara and Edo Periods, and in the third partial tone it becomes remarkably higher since Edo Period. The number of partial tones constituting the striking sound of bells becomes smaller on the average as the periods pass by from Nara to Kamakura Period. After that it increases again. The variations with the lapse of periods above mentioned are chiefly caused by the increase in thickness of "Koma-no-tsume"(Hoof) and the decrease in thickness of the upper portion of bell body. Considering these changes in thickness, the empirical formulae clarifying the variations are derived.

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