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Frequency-specific temporal envelope and periodicity components for lexical tone identification in Cantonese
Kevin C P Yuen1, Meng Yuan, Tan Lee
1Institute of Human Communicative Research, and Division of Otorhinolaryngology, Department of Surgery, The Chinese University of Hong Kong, Hong Kong, China. kevinyuen@surgery.cuhk.edu.hk
Ear and Hearing
|May 15, 2007
Summary
Temporal envelope and periodicity components (TEPC) are crucial for speech recognition in tonal languages. High-frequency TEPC significantly aids lexical tone identification in Cantonese, suggesting potential for hearing aid improvements.
Area of Science:
- Speech processing
- Acoustic phonetics
- Psychoacoustics
Background:
- Temporal envelope and periodicity components (TEPC) are vital for speech recognition, particularly in tonal languages.
- Understanding the role of TEPC in lexical tone identification is essential for developing advanced speech recognition technologies.
Purpose of the Study:
- To quantify the contribution of TEPC to lexical tone identification in Cantonese.
- To determine if TEPC's contribution to tone identification varies across different frequency bands.
Main Methods:
- Extracted TEPC from Cantonese monosyllable words using full-wave rectification and low-pass filtering.
- Modulated speech spectrum noise with TEPC from various frequency bands to create test stimuli.
- Assessed lexical tone identification by 18 normal-hearing adults using these stimuli.
Main Results:
- Lexical tone identification was optimal using TEPC from high-frequency bands (1-2 kHz and 2-4 kHz).
- Performance was poorest when using TEPC solely from low-frequency bands (60-500 Hz and 500-1000 Hz).
- Identification accuracy was higher for male speech stimuli compared to female stimuli.
Conclusions:
- High-frequency TEPC are critical for lexical tone identification in Cantonese.
- Findings suggest that signal processing algorithms can leverage TEPC for improved speech recognition in hearing prostheses for tonal language users.
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