The effect of pre-processing approach for improving speech intelligibility in a hall: Comparison between diotic and dichotic listening conditions
Nao Hodoshima, Takahito Goto, Noriko Ohata, Tsuyoshi INOUE, Takayuki Arai · Nippon Onkyo Gakkaishi/Acoustical science and technology/Nihon Onkyo Gakkaishi · 2005
0.4–1.3 s. Clear improvements were obtained with reverberation times of 0.8–1.2 s. Binaural listening enhances the ability to understand speech in reverberation [15]. Helfer [16] compared the correct rate of binaural hearing with that of diotic hearing at a 1.6 s reverberation time and confirmed that the correct rate of binaural hearing (69.5%) was higher than that of diotic hearing (63.4%). The purpose of this study is to compare the effect of steady-state suppression in two listening environments: dichotic and diotic. In the dichotic case, different stimuli are presented to listener’s right and left ears in the largest lecture hall at Sophia University in Tokyo, Japan. In the diotic case, a speech signal is convolved with the monaural impulse response measured in the same lecture hall and is presented simultaneously to both the right and left earphones. Section 2 presents reverberation conditions used in our perceptual experiments. Section 3 describes Experiment I (a dichotic environment), and Section 4, Experiment II (a diotic environment). Finally, discussions and conclusions are detailed in Section 5. 2. Reverberation condition