第14章音Sound原書 p.431–472

amplitude the amount that matter is disrupted during a sound wave, as measured by the difference in height between the crests and troughs of the sound wave.

振幅 音波のあいだに物質が乱される量。音波の山と谷の高さの差で測られる

beat a phenomenon produced by the superposition of two waves with slightly different frequencies but the same amplitude

うなり 振動数がわずかに違い振幅は同じ二つの波の重ね合わせで生じる現象

beat frequency the frequency of the amplitude fluctuations of a wave

うなりの振動数 波の振幅の揺らぎの振動数

damping the reduction in amplitude over time as the energy of an oscillation dissipates

減衰 振動のエネルギーが散るにつれて振幅が時間とともに減ること

decibel a unit used to describe sound intensity levels

デシベル 音の強さのレベルを表すのに使われる単位

Doppler effect an alteration in the observed frequency of a sound due to relative motion between the source and the observer

ドップラー効果 源と観測者の間の相対運動によって、観測される音の振動数が変わること

fundamental the lowest-frequency resonance

基本音 最も低い振動数の共鳴

harmonics the term used to refer to the fundamental and its overtones

倍音 基本音とその上音を指すのに使われる語

hearing the perception of sound

聴覚 音を感じ取ること