Loudness and timbre of broad-band noise mixed with frequency-modulated sounds

概要

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A series of experiments was conducted concerning the loudness and timbre of broadband noise mixed with frequency-modulated sounds. The results suggested the followings: (1) FM sounds overlapped on broad-band noise can be just detectable when S/N is around zero (S: the level of FM sound, N: the 1/3 octave band level of broad-band noise with center frequency corresponding to carrier frequency of FM sound). (2) FM sounds overlapped on broad-band noise can be detected at S/N of -10 dB or less when it is interrupted. (3) The loudness of broad-band noise shows good correspondence with L__eq. However, when a prominent frequency component, such as FM sounds, is included, loudness level based on ISO 532B (LLz) shows better correspondence than L__eq. (4) The timbre becomes deteriorated when the level of specific frequency component increases or when its frequency becomes high. These effects were found even when the overall values of L__eq were kept constant. Neither L__eq nor LLz is sufficient for evaluating these effects. The methond for calculating sharpness proposed by von Bismarck is an appropriate method for evaluating the metallic aspect of the timbre.
社団法人日本音響学会の論文