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Updated: Jun 21, 2026

Systematic Hearing Performance Evaluation Process for Adolescents with Cochlear Implantation at Early Ages
Published on: March 24, 2023
Cantonese tone recognition with enhanced temporal periodicity cues
Meng Yuan1, Tan Lee, Kevin C P Yuen
1Department of Electronic Engineering, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong. myuan@ee.cuhk.edu.hk
Enhancing temporal envelope and periodicity cues (TEPCs) significantly improves Cantonese tone recognition in noise, especially at lower signal-to-noise ratios. High-frequency TEPCs are crucial for accurate tone identification.
Area of Science:
- Auditory Neuroscience
- Speech Perception
- Signal Processing
Background:
- Cochlear implants often degrade temporal envelope and periodicity cues (TEPCs), impacting speech perception.
- Cantonese tone recognition is particularly challenging in noisy conditions due to the importance of pitch variations.
Purpose of the Study:
- To investigate the role of TEPCs in Cantonese tone recognition.
- To evaluate the effectiveness of enhancing TEPCs for improving tone identification in noise.
Main Methods:
- A noise-excited vocoder simulated cochlear implant processing.
- TEPCs were extracted from four frequency bands (60-500 Hz, 500-1000 Hz, 1000-2000 Hz, 2000-4000 Hz).
- Periodicity enhancement involved replacing temporal fluctuations with a sinusoid matching the fundamental frequency.
Main Results:
- TEPCs from higher frequency bands (1000-4000 Hz) were more critical for tone identification.
- Periodicity-enhanced TEPCs consistently improved tone identification accuracy.
- Improvements were more pronounced at low signal-to-noise ratios and for female voices.
Conclusions:
- TEPCs are vital for Cantonese tone recognition, with high-frequency cues being particularly important.
- Periodicity enhancement is a viable strategy to improve tone recognition in noisy environments, especially for cochlear implant users.
- The enhancement method benefits tone perception without compromising recognition of speech segments.
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