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Acoustic analysis is an objective measurement approach commonly used in the assessment of the singing voice. It involves parameters such as fundamental frequency, formant, intensity, vibrato pattern, and others, providing parameters on the internal view of the singing voice. However, presenting multi-dimensional voice data from multiple audio files simultaneously in current studies is a challenging task. This review summarises existing methodologies, highlighting their limitations and proposing future directions, particularly integrating Information and Communications Technology to enhance vocal analysis visualisation. This study also emphasises the critical role of advanced visualisation methods in enhancing the accuracy, accessibility, and impact of vocal analysis, and it aims to enhance the understanding of vocal mechanisms, support singers and students in vocal practice, and drive forward the field of vocal research through innovative, user-friendly technologies. Our future work will focus on developing interactive visualisation techniques to simplify and enrich the interpretation of vocal data, making complex acoustic properties accessible to a broader audience, including non-experts.
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