Loudness, in Bels (after Alexsander Bell), of a sound of intensity I is defined to be , where is the minimum intensity detectable by the human ear (such as the tick of a watch at 6 m under quiet conditions), . Sound loudness is a subjective term describing the strength of the ear's perception of a sound. The sound intensity must be factored by the ear's sensitivity to … Loudness, a subjective measure, is often confused with objective measures of sound strength such as sound pressure, sound pressure level, sound intensity … In a direct field or free field, the sound level (SPL) of a spherical wave decreases with doubling of the distance by (−)6 dB. The amplitude of a sound decides its intensity, which in … Loudness is a measurement of the sound perceived by the human ear. RMS or Root Mean Square measurements are a sort of averaging of sound levels over a short period of time. Loudness perception (and frequency) Amplitude plays the dominant role in loudness perception. Loudness, a subjective measure, is often confused with physical measures of sound strength such as sound pressure, sound pressure level (in decibels), sound intensity or sound power. Loudness is the characteristic of a sound that is primarily a psychological correlate of physical strength. Loudness is defined as “the attribute of auditory sensation in terms of which sounds can be ordered on a scale extending from quiet to loud,” by the American National Standards Institute. Loudness: Loudness is a measure of the response of the ear to the sound. The loudness of a sound is defined by its amplitude. Measure sound loudness levels by using a microphone on your phone, laptop or desktop computer. It is measured in decibels (dB). Volume levels can be measured in a few different ways, with RMS and Peak being the most common. Loudness is measured in units called decibels. The intensity or loudness of a sound depends upon the extent to which the sounding body vibrates, i.e., the amplitude of vibration. Start studying Musical Terms: Loudness. Weighting filters such as A-weighting and LKFS attempt to compensate measurements to correspond to loudness as perceived by the typical human. The threshold of human hearing has an intensity of about .0000000000001 watts per meter squared and corresponds to 0 decibels. More formally, it is defined as "that attribute of auditory sensation in terms of which sounds can be ordered on a scale extending from quiet to loud." The sound pressure decreases in inverse proportion to the distance, that is, with 1/r from the measuring point to the sound source, so that doubling of the distance decreases the sound pressure to a half (!) The loudness of a sound relates the intensity of any given sound to the intensity at the threshold of hearing. 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