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Reverberation is a result of multiple REFLECTIONs. A SOUND WAVE in an enclosed or semi-enclosed environment will be broken up as it is bounced back and forth among the reflecting surfaces. Reverberation is, in effect, a multiplicity of ECHOes whose speed of repetition is too quick for them to be perceived as separate from one another. W.C. Sabine established the official period of reverberation as the time required by a sound in a space to decrease to one-millionth of its original strength.
When a system with a natural vibrating FREQUENCY is stimulated by an outside force of the same frequency, the system can be set in a motion called VIBRATION. As the frequency of the stimulus closely approaches that of the system, OSCILLATION occurs, which reaches a maximum AMPLITUDE at the natural resonant frequency.
The tonal QUALITY or TIMBRE of a sound. The term is usually used in a subjective, descriptive manner, often with such adjectives as 'full' or 'rich'.
An ordering of a system of PITCHes, usually in ascending FREQUENCY order. The distance between any two pitches or NOTEs is called an interval.