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“ú–{•ŸŽƒHŠw‰ïŽ Vol. 11, No. 2, pp. 37-42 (2009)

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Improvement of listening to public announcements by amplitude compression (I)
Listening of normal-hearing persons under noisy environments

Takaya KATO, Asobu HATTORI, Yutaka SUZUKI, Osamu SAKATA, Shun-ichi IMAMURA, Shuichiro ENDO, Akihito MIZUKOSHI and Keisuke MASUYAMA

Since the amplitude of some consonants such as voiceless consonant is low, listening to these consonants tends to be affected by environmental noise. When a speech is delivered in a noisy environment, listeners may experience difficulty in grasping the contents of the speech in spite of it being audible. In this study, small portions of speech were amplified by amplitude compression. As a result, word intelligibility scores among young listeners without hearing disabilities in a noisy environment improved a maximum rise of 30 points.

Key words: Universal design, Amplitude compression, Public announcements, Normal hearing, Noisy environments