Sound or sound is a mechanical compression or longitudinal waves that propagate through a medium. Medium or intermediate substances may be liquid, solid, gas. So, for example, sound waves can propagate in the water, coal, or air.
Most of the sound is a combination of various signals, but the pure sound can theoretically be explained by the speed or frequency of oscillation is measured in Hertz (Hz) and amplitude or loudness of sound measurements in decibels.
Humans hear when sound waves, the vibrations in the air or other medium, to the human eardrum. Limit the frequency of sound can be heard by the human ear is approximately from 20 Hz to 20 kHz in general amplitude with variations in the response curve. Sounds above 20 kHz are called ultrasound and below 20 Hz is called infrasound.
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