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Ganjun Liu, Tao Zhang, Xiaonan Liu

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    This study introduces a novel non-linear voice repair vocoder to enhance speech quality and intelligibility for individuals with voice disorders. The PVR-Vocoder effectively repairs pathological speech, improving communication for those with voice conditions.

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    Area of Science:

    • Speech synthesis and signal processing.
    • Medical acoustics and voice pathology.

    Background:

    • Existing vocoder techniques primarily focus on synthesizing normal speech.
    • Pathological voice disorders present unique challenges in speech synthesis and require specialized solutions.
    • Current methods often neglect the specific needs of individuals with voice impairments, impacting speech intelligibility.

    Purpose of the Study:

    • To propose a non-linear voice repair vocoder (PVR-Vocoder) for pathological speech.
    • To enhance the quality and intelligibility of pathological vowels and sentences.
    • To address the limitations of existing vocoders in handling voice disorders.

    Main Methods:

    • Utilizing amplitude modulated-frequency modulated (AM-FM) and Teager energy operations for pitch and spectral envelope enhancement.
    • Implementing a spectral tracking algorithm to stabilize pitch and reduce errors.
    • Developing a spectral reconstruction algorithm for rebuilding spectral structure via energy operations.

    Main Results:

    • The PVR-Vocoder demonstrates exceptional performance in enhancing pathological voice intelligibility.
    • Objective indicators, subjective evaluations, and spectrum observations confirm the vocoder's effectiveness.
    • Significant improvements in speech quality and intelligibility for pathological voices were achieved.

    Conclusions:

    • The proposed PVR-Vocoder offers a viable solution for pathological voice repair.
    • This technique has the potential to significantly improve speech interaction for individuals with voice disorders.
    • The study highlights the importance of specialized vocoder approaches for addressing specific speech pathologies.