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Spectral analysis of bone-conducted speech using modified linear prediction

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Abstract

This paper improves the performance of linear prediction (LP) in precise spectral estimation of bone-conducted (BC) speech. Inherently, BC speech contains a wide spectral dynamic range that causes ill conditioning in the autocorrelation (ACR) method and its variants, where the Levinson–Durbin (L–D) algorithm is commonly implemented. Instead of the conventional LP-based spectral estimation methods, we utilize the covariance-based method, specifically the modified covariance (MC) method, where the orthogonal decomposition algorithm is deployed. In this paper, we derive the MC method from the least squares (LS) technique for BC speech analysis. The MC method reduces the eigenvalue expansion that compresses the spectral dynamic range of the BC speech signal. The effect of spectral dynamic range compression declines the ill-conditioned properties of LP. Through the proposed method using synthetic BC speech, the resulting power spectrum provides more accurate peaks than the conventional methods. The validity of the proposed method is also analyzed by inspecting real BC speech. This study reveals the utmost use of BC speech in speech processing systems. The experimental results demonstrate that the proposed method provides more accurate spectral estimation for synthetic and real BC speeches compared with conventional spectral estimation methods.

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Acknowledgements

We sincerely express our gratitude to United International University (UIU) for support in making this research happen. This research was funded by the Institute for Advanced Research Publication Grant of United International University, Ref. No.: IAR-2024-Pub-054.

Funding

This research was funded by the Institute for Advanced Research Publication Grant of United International University, Ref. No.: IAR-2024-Pub-054.

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Authors and Affiliations

  1. Computer Science and Engineering, Daffodil International University, Dhaka, 1216, Bangladesh

    Ohidujjaman

  2. Computer Science and Engineering, Comilla University, Comilla, 3506, Bangladesh

    Mahmudul Hasan

  3. School of Electrical and Information, Northeast Agricultural University, Harbin, 150030, China

    Shiming Zhang

  4. Computer Science and Engineering, United International University, Dhaka, 1212, Bangladesh

    Mohammad Nurul Huda

  5. Computer Science and Engineering, Green University of Bangladesh, Kanchon, 1460, Bangladesh

    Mohammad Shorif Uddin

  6. Computer Science and Engineering, Jahangirnagar University, Savar, 1342, Bangladesh

    Mohammad Shorif Uddin

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  1. Ohidujjaman
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  2. Mahmudul Hasan
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  3. Shiming Zhang
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  4. Mohammad Nurul Huda
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  5. Mohammad Shorif Uddin
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Contributions

Ohidujjaman: writing—original draft, writing—review & editing, conceptualization, formal analysis, data curation. Mahmudul Hasan: conceptualization, formal analysis, data curation. Shiming Zhang: writing—review & editing, data curation. Mohammad Nurul Huda: conceptualization, methodology. Mohammad Shorif Uddin: writing—review & editing, visualization, supervision.

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Correspondence to Ohidujjaman or Mahmudul Hasan.

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Ohidujjaman, Hasan, M., Zhang, S. et al. Spectral analysis of bone-conducted speech using modified linear prediction. Int J Speech Technol 27, 1039–1053 (2024). https://doi.org/10.1007/s10772-024-10151-3

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  • DOI: https://doi.org/10.1007/s10772-024-10151-3

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