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This study applies an automated procedure, Amplitude Envelope Modulation Spectrum (AEMS), to probe rhythmic differences between L1 Japanese and Japanese accented English. AEMS directly and automatically quantifies temporal regularities in the amplitude envelope of the speech waveform within specified frequency bands and has been shown to successfully differentiate types of dysarthria and utterances with and without code-switches. Ten native speakers of Japanese (1 male, 9 female) produced the rainbow passage in both Japanese and English. The passages will be segmented into sentences before AEMS application. The AEMS consist of the slow-rate (up to 10 Hz) amplitude modulations of the full signal and 7 octave bands ranging in center frequency from 125 to 8000 Hz. Six variables relating to peak frequency and amplitude and relative energy above, below, and in the region of 4 Hz will be calculated from each frequency bands. Discriminant function analyses (DFA) will then be performed to determine which sets of predictor variables best discriminate between the two passages.
Wayland et al. (Tue,) studied this question.