钢琴幅度谱的七、九次谐波对钢琴音质影响的研究

主要研究了钢琴声音幅度谱中的第七、第九次谐波对钢琴音质的影响。重点考察了衰减第七、第九次谐波幅度情况下，钢琴声音音质的变化情况。实验结果表明，在钢琴的中低音区，不论是单键发音，还是三度和声、五度和声或三度和弦，令第七、第九次谐波的幅度衰减，均能使钢琴声音的音质有所改善。但如果衰减幅度太大，反而会使得钢琴的声音更加单薄。因此，中间应存在一个最佳比值，这个比值有待进一步的研究。

Study on the Effect of the 7th and 9th Harmonics of Piano Amplitude Spectrum on Piano Tone Quality

This paper mainly studies the effect of the 7th and 9th harmonics of piano amplitude spectrum on piano tone quality. The focus of the paper is on how piano timbre changes with the attenuation of the 7th and 9th harmonics amplitude of piano. The result shows that, in the bass and median tone of piano, the timbre will be improved if the 7th and 9th harmonics are attenuated for either single-key, third harmony, fifth harmony or triad chord. However, if the attenuation is overdone, the sound of piano feels feeble. There is an optimum value for the 7th and 9th harmonics of a piano, and a further study is valuable.