Challenge: Existing textless speech-to-speech translation models have two main challenges: 1) learning cross-modal features and 2) learning alignment of difference languages in long sequences.
Approach: They propose a unit language to overcome two main modeling challenges . they propose task prompt modeling to utilize the unit language in guiding the modeling process.
Outcome: The proposed language improves over a strong baseline and achieves comparable performance to models trained with text.

Similar Papers

Direct Speech-to-Speech Translation With Discrete Units (2022.acl-long)

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Challenge: Existing direct speech-to-speech translation models rely on text generation as an intermediate step.
Approach: They propose a direct speech-to-speech translation model that translates speech from one language to another without relying on intermediate text generation.
Outcome: The proposed model produces 6.7 BLEUs in the Fisher Spanish-English dataset when trained without any text transcripts and with text supervision.
Textless Speech-to-Speech Translation on Real Data (2022.naacl-main)

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Challenge: Existing text-based speech-to-speech translation systems rely on cascaded approach . text-to text translation systems require text generation and a single input to generate output .
Approach: They propose a textless speech-to-speech translation system that can translate speech from one language into another without the need of text data.
Outcome: The proposed system can translate speech from one language into another without text data.
Dub-S2ST: Textless Speech-to-Speech Translation for Seamless Dubbing (2025.findings-emnlp)

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Challenge: Existing speech translation approaches often overlook the transfer of speech patterns, leading to mismatches with source speech and limiting their suitability for dubbing applications.
Approach: They propose a diffusion-based speech-to-unit translation model with explicit duration control that enables time-aligned translation.
Outcome: The proposed system preserves key characteristics such as duration, speaker identity, and speaking speed while maintaining key characteristics.
Speech-to-Speech Translation for a Real-world Unwritten Language (2023.findings-acl)

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Challenge: a new study examines speech-to-speech translation (S2ST) that translates speech from one language into another . the research area for unwritten languages remains a research area with little exploration due to the lack of training data.
Approach: They propose a system that translates speech from one language into another . they use Taiwanese Hokkien as an example of an unwritten language .
Outcome: The proposed system can be used to train models in languages without standard writing systems.
Can We Achieve High-quality Direct Speech-to-Speech Translation without Parallel Speech Data? (2024.acl-long)

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Challenge: Existing two-pass direct speech-to-speech translation models require parallel speech data to train, which is challenging to collect.
Approach: They propose a two-pass direct speech-to-speech translation (S2ST) model that decomposes the task into speech- to-text translation (s2TT) and text-tospech (TTS) they propose 'composer' S2ST model that integrates pretrained S2TT and TTS models into a direct S2 ST model.
Outcome: The proposed model integrates pretrained S2TT and TTS models into a direct S2ST model without parallel speech data.
Toward Joint Language Modeling for Speech Units and Text (2023.findings-emnlp)

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Challenge: Speech and text are two major forms of human language and little effort has been made to model them together.
Approach: They propose to combine speech and text models to create mixed speech-text data by using different tokenizers and automatic metrics to evaluate how well the model mixes speech and texts.
Outcome: The proposed model improves over a speech-only baseline and shows zero-shot cross-modal transferability.
Speech-to-Speech Translation with Discrete-Unit-Based Style Transfer (2024.acl-srw)

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Challenge: Existing methods to translate spoken utterances from one language to another are unable to preserve speaker timbre of source speech.
Approach: They propose a pipeline with style-transfer capability on the basis of self-supervised speech representations and codec units.
Outcome: The proposed model achieves zero-shot cross-lingual style transfer on previously unseen source languages.
PromptST: Abstract Prompt Learning for End-to-End Speech Translation (2023.emnlp-main)

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Challenge: Experimental results show that PromptST can improve speech-to-text translation by capturing richer linguistic knowledge.
Approach: They propose a plug-in prompt-enhanced S2T model that captures richer linguistic knowledge . they use a 10GB linguistic probing benchmark to investigate the fusion of speech and text features .
Outcome: The proposed model can improve on a strong baseline by capturing richer linguistic knowledge.
Back Translation for Speech-to-text Translation Without Transcripts (2023.acl-long)

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Challenge: End-to-end speech-totext translation (ST) is often achieved by utilizing source transcripts, but transcripts are only sometimes available since numerous unwritten languages exist worldwide.
Approach: They propose an algorithm to synthesize pseudo ST data from monolingual target data to enhance ST without generating source transcripts.
Outcome: The proposed method achieves an average boost of 2.3 BLEU on MuST-C En-De, En-Fr, and En-Es datasets.
Leveraging Large Pre-trained Multilingual Models for High-Quality Speech-to-Text Translation on Industry Scenarios (2025.coling-main)

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Challenge: Speech-to-Text Translation systems rely on a sequential pipeline that combines ASR and MT models.
Approach: They propose a parameter-efficient framework that integrates one LPSM with a multilingual MT engine.
Outcome: The proposed framework integrates one LPSM with a multilingual MT engine.

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