中华和钟之双音鎛钟的声频特征和振动方式研究

Frequency characteristics of radiated sound and modes of vibration of a two-tone Chinese Peace Bell

本文对中华和种之中央 钟的声频特性和振动方式进行了研究．利用谱估计对其辐射声信号进行了谱分析；利用时频分析．研究了其谱结构随时间变化情况；为了了解其频率变化及音高情况，计算了其不同时刻的瞬时平均频率．同时，通过不同位置的振动信号谱分析，重建了其在不同频率下的振动方式．

The frequency characteristics of the radiated sound and the modes of vibra tion of a two-tone Chinese peace bell are studied. With Welch's spectral estimate, the main frequency elements of radiated sound from the bell are determined. With time-fre quency analysis, the change of the spectrum with time is revealed. The higher frequency harmonics decay very fast, while the lower ones increase at the beginning and then decay slowly. From conditional mean frequency (CMF) of the spectrograms of the sound, the change in the pitch of the bell is discussed. With an accelerator, the vibration distribu- tions on the different parts of the bell are measured. With short time spectrum analysis, the vibration modes at different frequencies have been reconstructed.