著者

Ueda Kazuo Hirahara Tatsuya

出版者

一般社団法人日本音響学会

雑誌

Journal of the Acoustical Society of Japan (E) (ISSN:03882861)

巻号頁・発行日

vol.12, no.3, pp.131-138, 1991-05

被引用文献数

3 1

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Loudness comparisons were performed by four subjects, under two experimental conditions: free field (anechoic room) and diffuse field (reverberation room). Each subject adjusted the headphone level of critical band noise bursts untill they were equally loud as those from a reference loudspeaker (70 dB SPL). Measurement scatter was smaller in the diffuse field than in the free field. To examine the reliability of loudness judgments at high frequencies, another method-hearing thresholds by Bekesy tracking-was employed. Each subject's threshold was measured with both loudspeakers and headphones. After compensation was made for the loudspeaker and room transfer functions, headphone frequency response was extrapolated from the results. This method led to high-frequency responses similar to those from loudness comparison. A loudness comparison experiment in which the subjects continuously wore a headphone was performed. However, the method of sound pressure loss measurement should be reconsidered.