Nao Hodoshima

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Overlap-masking degrades speech intelligibility in reverberation [R. H. Bolt and A. D. MacDonald, J. Acoust. Soc. Am. 21(6), 577-580 (1949)]. To reduce the effect of this degradation, steady-state suppression has been proposed as a preprocessing technique [Arai et al., Proc. Autumn Meet. Acoust. Soc. Jpn., 2001; Acoust. Sci. Tech. 23(8), 229-232 (2002)].(More)
Most listeners have difficulty understanding speech in reverberant conditions. The purpose of this study is to investigate whether it is possible to reduce the degree of degradation of speech intelligibility in reverberation through the development of an algorithm. The modulation spectrum is the spectral representation of the temporal envelope of the speech(More)
1. Introduction When listening to a lecture in a large auditorium it is often difficult to understand the speech. Among other factors, comprehension may be impaired by reverberation, which is sound reflecting from the wall, interfering with direct sound. Based on the modulation transfer function (MTF), the speech transmission index (STI) has been proposed(More)
In previous studies (Arai et al., 2001; Arai et al., 2002), we hypothesized that segments of an acoustic signal are masked by reverberation components of previous segments, degrading speech intelligibility. To reduce masking influences, we suppressed steady-state portions having more energy, but which are less crucial for speech perception. We have(More)
In a large auditorium, perceiving speech may become difficult. One reason that reverberation degrades speech intelligibility is the effect of overlap-masking (Bolt and MacDonald, 1949; Nabelek and Robinette, 1978). Reverberation is a more critical issue for elderly people to perceive speech than it is for young people (Fitzgibbons and Gordon-Salant, 1999).(More)
Reverberation is a large problem for speech communication and it is known that strong reverberation affects speech intelligibility. This is especially true for people with hearing impairments and/or elderly people. Several approaches have been proposed and discussed to improve speech intelligibility degraded by reverberation. Steady-state suppression is one(More)
1. Introduction It is known that strong reverberation affects speech intelligibility. Although early reflections often help speech intelligibility (the Haas effect, e.g., [1]) late reflections degrade speech intelligibility [2]. Overlap-masking in rever-berant environments is the main source of degradation in speech intelligibility [3–5]. Because of(More)
Public-address (PA) announcements are used to convey emergency information; however, noise and reverberation sometimes make announcements in public spaces unintelligible. Therefore, the present study investigated how combinations of speech spoken in an urgent style and preceding sounds affect speech intelligibility and perceived urgency in noisy and(More)
When we speak in an environment with noise, we often modify our speech production, and speech spoken in noise is generally more intelligible than speech produced in a quiet environment, which is known as the Lombard effect. Our goal is to provide intelligible speech announcements in noisy and/or reverberant public spaces, such as train stations. Thus, the(More)