[ 12/11/2023 ] Labels: 2D2E.Resonance D
Cello's E sound (frequency = 166Hz, period = 6.04mS, wavelength = 2.05m, the most typical simple sound), the sound waves emitted from the top plate do not use the side walls(Bouts) for direct reflection. But interact between the back plate instead. It appears that the intensity is amplified by repeating resonance (reverberation) every 6mS.
Probably some of it (less than 10%) is ejected out of the cello body. As a result, the cello's sound is emitted almost evenly as omnidirectional sound centered in the normal direction of the top plate.
(See: https://celloresonance.blogspot.com/ Labels: 2D2E.Resonance D)Celloの E音(周波数=166Hz, 周期=6.04mS, 波長=2.05m), 表板から放出される音波は側壁(Bouts)を直接反射に使うことなく、裏板との間で6mSごとに増強されて共鳴(反響)を繰り返し音量を増幅されているように見える。
おそらくその一部(10%未満)が筐体の外へと放出される。その結果、チェロの音は表板の法線方向を中心に無指向性の音として概ね均等に放出されることになる。
