Implementation of Steady-State Suppression Using a Digital Signal Processor for Real-Time Processing: Evaluation of the Processing in an Actual Hall

摘要

In an actual hall, reverberation degrades speech intelligibility, which is the result of overlap-masking occurred when segments of an acoustic signal are affected by reverberation components of previous segments. Arai et al. (2001, 2002) have been proposed a pre-processing technique which suppresses steady-state portion of speech in order to prevent the result of overlap-masking. However, the originally proposed technique is not suitable for real-time processing. Therefore, Arai et al. (2003) suggested alternative technique based on the First Fourier Transform (FFT) with cepstral analysis in order to implement real-time processing. In this study, we successfully implemented the real-tune processing of steady-state suppression based on the FFT with a digital signal processor (DSP) (Goto et al., 2005). Also, the effectiveness of the real-time processing implemented with a DSP was evaluated for younger as well as elderly people in an actual reverberant environment.