<P> The perception of loudness is related to sound pressure level ( SPL ) , frequency content and duration of a sound . The human auditory system averages the effects of SPL over a 600 -- 1000 ms interval . A sound of constant SPL will be perceived to increase in loudness as samples of duration 20 , 50 , 100 , 200 ms are heard , up to a duration of about 1 second at which point the perception of loudness will stabilize . For sounds of duration greater than 1 second , the moment - by - moment perception of loudness will be related to the average loudness during the preceding 600 -- 1000 ms . </P>
<P> The perception of loudness is related to sound pressure level ( SPL ) , frequency content and duration of a sound . The human auditory system averages the effects of SPL over a 600 -- 1000 ms interval . A sound of constant SPL will be perceived to increase in loudness as samples of duration 20 , 50 , 100 , 200 ms are heard , up to a duration of about 1 second at which point the perception of loudness will stabilize . For sounds of duration greater than 1 second , the moment - by - moment perception of loudness will be related to the average loudness during the preceding 600 -- 1000 ms . </P>
what term describes the human perception of frequency
what term describes the human perception of frequency
sound pressure level ( SPL )
sound pressure level ( SPL )