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Old 03-19-2011, 08:17 PM   #2
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Knowledge Focus: answer list. Loudness loudness ,moncler jacket, also known as sound intensity or volume, it represents the strength of sound energy level , depending on the size of the sound wave amplitude . The general loudness of sound by sound pressure ( dyne / cm ), or sound intensity ( watts / square centimeter ) to measure the sound pressure of the unit of Pa (Pa), ..
loudness, also known as the sound intensity or volume, It represents the strength of sound energy level , depending on the size of the sound wave amplitude . The general loudness of sound by sound pressure ( dyne / cm ), or sound intensity ( watts / square centimeter ) to measure the sound pressure of the unit of Pa (Pa), it is the ratio of sound pressure and the base is called the sound pressure level of Is expressed in decibels (dB). The loudness of the psychological feelings , the general units Song (Sone) to measure and define lkHz, 40dB loudness of pure tones as a Song. The relative amount of loudness is called loudness level,moncler down jacket, it represents a ratio of loudness and loudness of the reference value , in units of port side (phon),layout designed to keep the original, that is, when the ear was the sound of a single frequency with 1kHz pure tone as sound ,洋了好欠好, the sound Sound pressure level in decibels that its loudness level. Can be seen ,moncler down jackets, both in objective and subjective , these two concepts are completely different units , in addition to 1kHz pure tone , the sound pressure level is generally not equal to the value of the value of the loudness level , the use of to note.
loudness is the basis for hearing . The strength of normal human hearing range is 0dB-140dB ( It was also considered to be -5dB-130dB). Of course , beyond the audible frequency range of the human ear (ie frequency domain) of the sound , even if the loudness is bigger, the human ear can not sense (that is,moncler shop, loudness is zero). However, the human ear 's audible frequency domain, if the sound or strong to weak to a certain extent ,outlet moncler, the human ear can not hear the same . When the sound can be reduced to the human ear has just heard ,Thunder and Flashget answer list are good, the sound level at this time known as the 1kHz tone generally subject to measurement , the human ear can hear just the sound pressure is 0dB ( 0.3dB that is feeling more than usually ), when the sound intensity is 10-16W/cm2 loudness level as the 0 side. When the sound enhancement to make people feel pain in the ear , the threshold referred to as 1kHz tone is still subject to be measured , people feel pain in the ear to sound pressure level of about 140dB or so.
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