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Timbre or tone QUALITY is determined by the behaviour in time of the FREQUENCY content or SPECTRUM of a sound, including its TRANSIENTs which are extremely important for the identification of timbre.
The psychological measure of the magnitude of a SOUND or SOUND OBJECT including its SPECTRUM (frequency and intensity), harmonic content, duration and spatial properties.
The stage that a particle in vibration has reached in its CYCLE. Particles are in phase when they are at the same stage in the cycle at the same time, and out of phase when they are at opposite stages. Phase is measured by the angle of rotation, in degrees or radians.
Any quantity or body is in a state of oscillation when its value or motion is continually changing so that it passes through maximum and minimum values or positions. When a system, body or quantity is set in PERIODIC motion or vibration, it is said to be in oscillation.