. . . "Further, the timbres may be distinguished from one another in any of, for example, the following respects: kind of musical instrument such as a piano, a violin and a drum; kind of waveform of musical tones such as a sinusoidal waveform, a triangular waveform and a rectangular waveform; the magnitude of containing-ratios of specific components such as a high-order harmonic wave component and a nois" .