An overtone is an oscillatory mode above the fundamental mode in the same mode family. Waveguide branches are compared at fixed horizontal wavenumber. Their frequencies need not be integer multiples of the fundamental frequency. In a scalar layered guide, additional vertical nodes distinguish successive overtones.
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Overtone can refer to different concepts depending on the context in which it is used. Here are a few common interpretations: 1. **Music**: In music, an overtone is a frequency that is higher than the fundamental frequency of a sound. When an instrument or voice produces a note, it vibrates at a fundamental frequency, but it also generates additional frequencies that are multiples of the fundamental (harmonics). These overtones contribute to the richness and timbre of the sound.