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How Does Alignment Error Affect Automated Pronunciation Scoring in Children's Speech?

Prad Kadambi¹, Tristan Mahr², Lucas Annear²

¹Arizona State University, USA.

|April 9, 2025

Summary

This summary is machine-generated.

Automated pronunciation scoring can be accurate for children. Our study shows that alignment errors have a moderate impact, ensuring reliable comparisons between child speakers using different scoring methods.

Keywords:

alignment error automatic pronunciation evaluation forced alignment goodness of pronunciation phoneme segmentation

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Area of Science:

Speech Science
Computational Linguistics
Child Language Acquisition

Background:

Automated pronunciation scoring assesses speech deviation from adult norms via phonetic segmentation and phoneme likelihood computation.
Distinguishing alignment error from true acoustic deviation is crucial for accurate automated scoring.
Children's speech presents unique challenges, potentially magnifying both pronunciation deviations and alignment errors.

Purpose of the Study:

To quantify the difference between pronunciation scores derived from manual versus automatic speech alignment.
To investigate the influence of alignment error and other factors (phoneme position, type) on pronunciation scoring in children.

Main Methods:

Utilized mixed-effects modeling to predict the difference in pronunciation scores.
Compared scores calculated using manual phonetic alignment ( ) against those from automatic forced alignment ( ).
Analyzed the impact of alignment error, phoneme position, and phoneme type on scoring discrepancies.

Main Results:

Alignment error was found to have a moderate effect on the pronunciation score difference ( ).
Other analyzed variables, such as phoneme position and type, had minimal to no significant effect.
Manual and automatically calculated scores showed close agreement after cross-utterance averaging.

Conclusions:

Automated forced alignment provides a reliable method for pronunciation scoring in children.
The impact of alignment error is manageable and does not preclude accurate comparisons.
Practical comparisons of child speakers are highly comparable whether using manual or automatic alignment methods.