Challenge: Expressive zero-shot voice conversion (VC) aims to modify source timbre to match unseen speaker . existing zero- shot VC systems struggle to reproduce paralinguistic information in highly expressive speech .
Approach: They propose a framework for expressive zero-shot voice conversion that uses hybrid content encoding and memory-augmented context-aware timbre modeling.
Outcome: The proposed framework surpasses state-of-the-art VC systems in speech naturalness, speaker similarity, and speaker similarness.

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Rhythm Controllable and Efficient Zero-Shot Voice Conversion via Shortcut Flow Matching (2025.acl-long)

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Challenge: Existing methods focus on disentangling speakers and content, while others focus on preserving the source's prosody.
Approach: They propose a rhythm-controllable and efficient zero-shot voice conversion model that transforms the source speaker’s timbre into an unseen one while retaining speech content.
Outcome: The proposed model adapts the linguistic content duration to the desired speaking style, facilitating the transfer of the target speaker’s rhythm.
EZ-VC: Easy Zero-shot Any-to-Any Voice Conversion (2025.findings-emnlp)

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Challenge: Current voice conversion methods struggle in zero-shot cross-lingual settings . authors develop a method that can be used in zero shot cross-linguistic settings despite advances in technology .
Approach: They propose a voice-conversion model that combines discrete speech representations with a non-autoregressive speech decoder.
Outcome: The proposed approach excels in zero-shot cross-lingual settings even for unseen languages and accents.
O_O-VC: Synthetic Data-Driven One-to-One Alignment for Any-to-Any Voice Conversion (2025.findings-emnlp)

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Challenge: Traditional voice conversion methods attempt to separate speaker identity and linguistic information into distinct representations, but this method often leads to information loss during training.
Approach: They propose a method that leverages synthetic speech data generated by a pretrained model . synthetic data pairs that share the same linguistic content are used as input-output pairs .
Outcome: The proposed method outperforms state-of-the-art methods in speaker-to-voice conversions.
FC-TTS: Style and Timbre Control in Zero-Shot Text-to-Speech with Disentangled Speech Representations (2026.acl-long)

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Challenge: Recent advances in text-to-speech (TTS) have enabled accurate imitation of reference speech in terms of both speaking style and speaker timbre.
Approach: They propose a zero-shot text-to-speech framework that enables disentangled control of style and timbre by conditioning on two distinct reference utterances.
Outcome: The proposed framework achieves high-fidelity synthesis and competitive zero-shot naturalness while supporting consistent and independent manipulation of style and timbre.
RT-VC: Real-Time Zero-Shot Voice Conversion with Speech Articulatory Coding (2025.acl-demo)

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Challenge: Experimental evaluations show RT-VC delivers a 13.3% reduction in latency . voice conversion modifies speech to match the timbre of a target speaker while preserving content information.
Approach: They propose a zero-shot real-time voice conversion system that leverages an articulatory feature space to naturally disentangle content and speaker characteristics.
Outcome: The proposed system achieves a CPU latency of 61.4 ms, representing a 13.3% reduction in latency.
Low-Resource Multilingual and Zero-Shot Multispeaker TTS (2022.aacl-main)

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Challenge: Currently, the amount of data needed for TTS is limited to the vast majority of the spoken languages.
Approach: They propose to use language agnostic meta learning procedure to learn speaking a new language with just 5 minutes of training data while retaining the ability to infer the voice of even unseen speakers.
Outcome: The proposed approach is able to learn speaking a new language using just 5 minutes of training data while retaining the ability to infer the voice of even unseen speakers in the newly learned language.
ControlSpeech: Towards Simultaneous and Independent Zero-shot Speaker Cloning and Zero-shot Language Style Control (2025.acl-long)

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Challenge: Prior zero-shot TTS models only mimic the speaker’s voice without further control and adjustment capabilities while prior controllable TTS systems cannot perform speaker-specific voice generation.
Approach: They propose a style control module that captures codec representations corresponding to timbre, content, and style in a discrete decoupling codec space.
Outcome: The proposed system can fully clone the speaker's voice and perform speech-specific adjustment and control functions.
Advancing Zero-shot Text-to-Speech Intelligibility across Diverse Domains via Preference Alignment (2025.acl-long)

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Challenge: Existing zero-shot text-to-speech systems struggle in challenging scenarios such as tongue twisters, repeated words, code-switching, and cross-lingual synthesis.
Approach: They propose a dataset that leverages preference alignment techniques to improve performance . they also extend the Direct Preference Optimization framework to accommodate diverse TTS architectures .
Outcome: The proposed dataset improves intelligibility, similarity, and audio quality for multiple models across domains.
MobileSpeech: A Fast and High-Fidelity Framework for Mobile Zero-Shot Text-to-Speech (2024.acl-long)

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Challenge: Existing zero-shot text-to-speech systems require a few seconds of unseen speaker voice prompts to generate high-quality voices.
Approach: They propose a zero-shot text-to-speech system based on mobile devices . they use a discrete speech codec to integrate hierarchical information from the codec .
Outcome: The proposed system achieves RTF of 0.09 on a single A100 GPU and has been successfully deployed on mobile devices.
TCSinger 2: Customizable Multilingual Zero-shot Singing Voice Synthesis (2025.findings-acl)

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Challenge: Existing zero-shot singing voice synthesis models depend on phoneme and note boundary annotations, limiting their robustness and producing poor transitions between phonemes and notes.
Approach: They propose a multi-task multilingual zero-shot SVS model with style transfer and style control based on various prompts.
Outcome: Experimental results show that TCSinger 2 outperforms baseline models in subjective and objective metrics across multiple related tasks.

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