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Stockwell-Transform based feature representation for detection and assessment of voice disorders

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Abstract

In literature, various time-frequency representation methods were investigated for automatic detection of voice disorders. Stockwell-Transform (S-Transform) provides good time-frequency localization; hence, it may efficiently capture the voice disorder related information from speech signal. With this motivation, we investigated different variants of S-Transform for the classification of voice disorders. This study proposed the S-Transform based cepstral coefficients for voice disorder detection and assessment. The performance of the proposed feature was compared with baseline features on SVD and HUPA databases. Compared to baseline features, proposed features performed best in terms of classification accuracy of 80.2% and 79.8% on HUPA and SVD databases, respectively for voice disorder detection task. Also, the proposed features performed better in case of assessment task. Further, the experimental results reveal that combining cepstral coefficients derived from S-Transform with baseline features improved the performance of proposed systems by 8% and 4% for detection and assessment tasks, respectively which highlights complementary nature of the explored features. We also analysed the effectiveness of S-Transform based spectral representation in capturing the acoustic characteristics for various voice qualities like breathiness, harshness, creakiness, and falsetto phonations. This representation was also compared with other time-frequency based methods such as STFT, ZTW and SFF. It was observed that S-Transform effectively captures the acoustic variations associated with different voice qualities compared to other baseline methods, which may be due to better spectro-temporal resolution offered by the S-Transform.

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Data availability

The current study used the publicly available SVD and HUPA datasets for the analysis. The SVD dataset is freely available at : http://www.stimmdatenbank.coli.uni-saarland.de/.

Notes

  1. It is freely available at http://www.stimmdatenbank.coli.uni-saarland.de/

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  1. Speech Processing Laboratory, LTRC, KCIS, International Institute of Information Technology, Hyderabad, 500032, India

    Purva Barche, Krishna Gurugubelli & Anil Kumar Vuppala

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Barche, P., Gurugubelli, K. & Vuppala, A.K. Stockwell-Transform based feature representation for detection and assessment of voice disorders. Int J Speech Technol 27, 101–119 (2024). https://doi.org/10.1007/s10772-024-10085-w

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