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An Improved Weighting Curve Based on Equal-Loudness Contour

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In the real world, there are plenty of sound sources around us. Most of audio system desires to reproduce the sound sources as natural as possible. In measuring sound pressure level, we desire to obtain the value as similar as our perceived level. With many intense works done before, some researchers found that there is a relationship between perceived loudness level and measured sound level. In the theoretical words, the sensitivity of hearing varies as the frequency varies. Hence, a kind of weighting that represents human auditory system well is required to get more reasonable sound pressure level when measuring sound pressure level with a sort of machine such as a sound level meter. With this sense, some weighting functions have been developed and internationally standardized. Examples are A, B and C weighting. Such weighting functions are based on equal-loudness-level contour which is based on our human auditory characteristic called as equal-loudness relationship. At low loudness levels, low-frequency components don¡¯t have much contribution to the total loudness of the sound than those of high-frequency. So an A-weighting is commonly used. At higher level, applying another weighting gives closer answer to our perceived level. Thus, it would be very useful if we use only one weighting equation no matter how big the loudness level is. From this sense, a new weighting equation is achieved in this paper. It was constructed on the basis of the equal-loudness-level contour which internationally standardized in the document, ISO226:2003.

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