Kurzweil:Amplitude

From Sonikmatter

Amplitude is the signal level, or the power of a signal. In wave theory it is the height of the wave, and for audio, it is very similar to the volume. The greater the Amplitude the louder the sound will be.

Amplitude and percieved loudness:

Perceived loudness increases logarithmically with amplitude.

• 3db = Barely perceptable
• 5db = Clearly perceptable
• 10db = Twice as loud

The sound level scale in decibels is a logarthmic rather than linear scale. A sound level change of 3 decibels is double (or half) of the previous power level. The ear registers this as just noticable. A change in power level of 10 decibels is a power change of 10 times, and the ear judges this as only twice (or half) as loud. These relationships do not hold true at all power levels or at the frequencies, as the ear is a very non-linear device.

The Puppeteer 04:33, 1 Jul 2005 (EDT)

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