Determination of new equal-loudness level contours based on recent data with a loudness function model

摘要

A method of drawing equal-loudness level contours from discrete data points was developed based on a good knowledge of loudness perception. Four equations that express equal-loudness relation were deduced from four loudness functions, and an equation which best represents experimental results of equal-loudness relation was selected. Then, a new set of equal-loudness leel contours was determined by fitting the equation to recent experimental data. The resultant equal-loudness level contours lie significantly above the contours of the international standard, ISO 226, in both low and high frequency regions.