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Zehai Tu

7 accepted papers

2025

Can We "Cherry-Pick"? Investigating Multiple Renditions from a Generative Speech Synthesis Model

ICASSP 2025accepted

Generative Speech Models (GSMs) have seen a surge in popularity due to their ability to generate diverse and high-quality speech. Evaluating models that generate many different renditions for a given input sentence presents a new challenge. Listening tests are still the gold standard for evaluating…

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2025

Enabling Beam Search for Language Model-Based Text-to-Speech Synthesis

ICASSP 2025accepted

Tokenising continuous speech into sequences of discrete tokens and modelling them with language models (LMs) has led to significant success in text-to-speech (TTS) synthesis. Despite these models can generate speech with high quality and naturalness, their synthesised samples can still suffer from a…

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2025

Enhancing Expressive Voice Conversion with Discrete Pitch-Conditioned Flow Matching Model

ICASSP 2025accepted

This paper introduces PFlow-VC, a conditional flow matching voice conversion model that leverages fine-grained discrete pitch tokens and target speaker prompt information for expressive voice conversion (VC). Previous VC works primarily focus on speaker conversion, with further exploration needed in…

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2023

The 2nd Clarity Enhancement Challenge for Hearing Aid Speech Intelligibility Enhancement: Overview and Outcomes

ICASSP 2023accepted

This paper reports on the design and outcomes of the 2nd Clarity Enhancement Challenge (CEC2), a challenge for stimulating novel approaches to hearing-aid speech intelligibility enhancement. The challenge was for a listener attending to a target speaker in a noisy, domestic environment. The challeng…

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2022

Auditory-Based Data Augmentation for end-to-end Automatic Speech Recognition

ICASSP 2022accepted

End-to-end models have achieved significant improvement on automatic speech recognition. One common method to improve performance of these models is expanding the data-space through data augmentation. Meanwhile, human auditory inspired front-ends have also demonstrated improvement for automatic spee…

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