Xuanjun Chen

Ph.D. Candidate
NTU EECS

Xuanjun Chen (陳炫均)

Ph.D. Candidate, NTU EECS · Taipei, Taiwan

I am a Ph.D. student at National Taiwan University (NTU), advised by Hung-yi Lee & Jyh-Shing Roger Jang. Recently, my research focuses on speech tokenization and spoken language modeling.

Previously, I received my M.S. degree from NTU NTU (2023) and B.S. degree from Taiwan Tech Taiwan Tech (2020). My research encompassed speech processing, speech/text LLMs, and deepfake detection. I lead Deepfake research by proposing SingGraph for SingFake detection, developing CodecFake+ for data scarcity, and pioneering source tracing with SASTNet. Beyond security, I am a core contributor to several audio LLM and benchmarking projects, including DeSTA 2.5, Dynamic-SUPERB Phase 2, and Codec-SUPERB. I also mentor research on optimizing RAG efficiency for LLMs and uncovering their practical limitations. These works earned several honors, notably Best Paper Awards and Travel Grants. (see #Honors).

[ Email | Linkedin | Google Scholar | Github | X ]

Selected Publications (* equal contribution)

[1]
CodecFake+: Codec-Based Resynthesized Data as a Proxy for Detecting CodecFake Speech
Xuanjun Chen*, Jiawei Du*, Haibin Wu, Lin Zhang, I-Ming Lin, ..., Jyh-Shing Roger Jang, Hung-yi Lee
TASLP 2026 [ bib | arXiv | Project Page | Hugging Face | Code ]
[2]
DeSTA2.5-Audio: Toward General-Purpose Large Audio Language Model with Self-Generated Cross-Modal Alignment
Ke-Han Lu, Zhehuai Chen, Szu-Wei Fu, ..., Xuanjun Chen, ..., Boris Ginsburg, Yu-Chiang Frank Wang, Hung-yi Lee
TASLP 2026 [ bib | arXiv | Code ]
[3]
Joint Fullband-Subband Modeling for High-Resolution SingFake Detection
Xuanjun Chen*, Chia-Yu Hu*, Sung-Feng Huang, Haibin Wu, Hung-yi Lee, Jyh-Shing Roger Jang
INTERSPEECH 2026 (Submitted) [ bib | arXiv ]
[4]
How Does Instrumental Music Help SingFake Detection?
Xuanjun Chen, Chia-Yu Hu, I-Ming Lin, Yi-Cheng Lin, I-Hsiang Chiu, ..., Hung-yi Lee, Jyh-Shing Roger Jang
ICASSP 2026 [ bib | arXiv ]
[5]
Dynamic-SUPERB Phase-2: A Collaboratively Expanding Benchmark for Measuring the Capabilities of Spoken Language Models with 180 Tasks
Chien-yu Huang, Wei-Chih Chen, Shu-wen Yang, ..., Xuanjun Chen, ..., Shinji Watanabe, Hung-yi Lee
ICLR 2025 [ bib | arXiv | OpenReview | Code ]
[6]
A Preliminary Study of RAG for Taiwanese Historical Archives
Claire Lin*, Bo-Han Feng*, Xuanjun Chen*, Te-Lun Yang, Hung-yi Lee, Jyh-Shing Roger Jang
ROCLING 2025 [ bib | arXiv | ACL Anthology ] Best Paper Award
[7]
Towards Generalized Source Tracing for Codec-Based Deepfake Speech
Xuanjun Chen*, I-Ming Lin*, Lin Zhang, Haibin Wu, Hung-yi Lee, Jyh-Shing Roger Jang
IEEE ASRU 2025 [ bib | arXiv | Code ] Best Student Paper nominee
[8]
Codec-Based Deepfake Source Tracing via Neural Audio Codec Taxonomy
Xuanjun Chen*, I-Ming Lin*, Lin Zhang, Jiawei Du, Haibin Wu, Hung-yi Lee, Jyh-Shing Roger Jang
INTERSPEECH 2025 [ bib | arXiv | ISCA | Code ]
[9]
Singing Voice Graph Modeling for SingFake Detection
Xuanjun Chen, Haibin Wu, Jyh-Shing Roger Jang, Hung-yi Lee
INTERSPEECH 2024 (Oral) [ bib | arXiv | ISCA | Code | Lightning Talk ]
[10]
Codec-SUPERB @ SLT 2024: A lightweight benchmark for neural codec models
Haibin Wu, Xuanjun Chen, Yi-Cheng Lin, Jiawei Du, Kai-Wei Chang, ..., Shinji Watanabe, Hung-yi Lee
IEEE SLT 2024 [ bib | arXiv | IEEE Xplore ]
[11]
Codec-SUPERB: An In-Depth Analysis of Sound Codec Models
Haibin Wu, Ho-Lam Chung, Yi-Cheng Lin, ..., Xuanjun Chen, ..., Kai-Wei Chang, Alexander H. Liu, Hung-yi Lee
Findings of ACL 2024 [ bib | arXiv | ACL Anthology | Leaderboard | Code | Huggingface ]
[12]
Towards audio language modeling-an overview
Haibin Wu, Xuanjun Chen, Yi-Cheng Lin, Kai-wei Chang, Ho-Lam Chung, Alexander Liu, Hung-yi Lee
Tech Report, Feb. 2024 [ bib | arXiv | Awesome ]

Experience

  • : Research Intern, Shanda AI Research Tokyo, Japan
  • : Ph.D. in Communication EngineeringCommE, National Taiwan University
  • : M.S. in Computer ScienceCSIE, National Taiwan University
  • : B.S. in Computer ScienceCSIE, Taiwan Tech

Selected Honors & Services

Research and Academic Honors

  • : NTU Mr. Wen Tzu-Hsiang Memorial Scholarship, one of only 9 recipients in NTU
  • : Best Student Paper nominee, The IEEE Autom. Speech Recognit. and Underst. Workshop
  • : Best Paper Award, The 37th Conf. on Comput. Linguist. and Speech Processing
  • : Student Travel Grants, Google 2024 & ACLCLP in Taiwan 2025
  • : CTCI Foundation Bursary Award & Research Scholarship for Overseas Students,
  • : Ranked 3rd/42 submissions worldwide on the LA track of ASVspoof 2021 challenge
  • : Kwong Tung Community Outstanding Student Scholarship, awarded six years.
  • : Certificate of Achievement, Taiwan Tech (Top 5% of students; three semesters)
  • : 3rd Prize of SZIIT Academic Award , awarded by SZIIT (Top 20% of students)
  • : National Encouragement Scholarship, awarded by the Ministry of Education

International Event Organizer & Reviewer