The produced sound quality of guitar primarily depends on vibrational characteristics of the resonance box. Also, the tonal quality is influenced by the correct combination of tempo along with pitch, harmony, and melo...The produced sound quality of guitar primarily depends on vibrational characteristics of the resonance box. Also, the tonal quality is influenced by the correct combination of tempo along with pitch, harmony, and melody in order to find music pleasurable. In this study, the resonance frequencies of the modelled resonance box have been analysed. The free-free modal analysis was performed in <em>ABAQUS</em> to obtain the modes shapes of the un-constrained sound box. To find music pleasing to the ear, the right pitch must be set, which is achieved by tuning the guitar strings. In order to analyse the sound elements, the Fourier analysis method was chosen and implemented in <em>MATLAB</em>. Identification of fundamentals and overtones of the individual string sounds were carried out prior and after tuning the string. The untuned strings showed irregular fundamental frequencies and higher partials of decay. Octaves and power spectrums have been presented and discussed in this paper.展开更多
3D Octave卷积模型在高空间-高光谱影像分类中的应用,可以提高多树种分类任务的精度,对提高森林管理的精细化水平具有重要意义。设计了一种结合三维Octave卷积与注意力机制的3DOC-SSAM模型,通过3D Octave卷积和空间—光谱注意力机制,提...3D Octave卷积模型在高空间-高光谱影像分类中的应用,可以提高多树种分类任务的精度,对提高森林管理的精细化水平具有重要意义。设计了一种结合三维Octave卷积与注意力机制的3DOC-SSAM模型,通过3D Octave卷积和空间—光谱注意力机制,提高了模型的运行效率和分类性能。研究结果表明:①3DOC-SSAM模型总体精度达到99.53%,相对于SVM、ELM、2D-CNN、3D-CNN分别提高了13.86%、18.49%、12.90%和5.36%。且平均精度AA达到99.38%,Kappa系数达0.9947。②小样本训练的情况下,总体精度和平均精度仍然能够达到96.9%和95.52%,高于对比的模型。研究结果为多树种分类任务提供了一个高效且高精度的解决方案,在林业遥感中的应用前景广阔,有助于提升森林资源管理的科学性和可持续性。展开更多
文摘The produced sound quality of guitar primarily depends on vibrational characteristics of the resonance box. Also, the tonal quality is influenced by the correct combination of tempo along with pitch, harmony, and melody in order to find music pleasurable. In this study, the resonance frequencies of the modelled resonance box have been analysed. The free-free modal analysis was performed in <em>ABAQUS</em> to obtain the modes shapes of the un-constrained sound box. To find music pleasing to the ear, the right pitch must be set, which is achieved by tuning the guitar strings. In order to analyse the sound elements, the Fourier analysis method was chosen and implemented in <em>MATLAB</em>. Identification of fundamentals and overtones of the individual string sounds were carried out prior and after tuning the string. The untuned strings showed irregular fundamental frequencies and higher partials of decay. Octaves and power spectrums have been presented and discussed in this paper.
