Xuanjun Chen

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 Jyh-Shing Roger Jang and Hung-yi Lee. Prior to this, I earned my M.S. and B.S. in Computer Science from NTU NTU (2023) and Taiwan Tech Taiwan Tech (2020). My research interests include large language models, spoken language models, speech generation, and deepfakes. Along the way, I have been fortunate to receive several research honors, highlighted by:

Currently, I am exploring model training and benchmarking for audio understanding and generation. Previously, my research spanned three threads: leading work on audio deepfakes (SingGraph, CodecFake+, SASTNet), contributing to large audio-language models and benchmarks (DeSTA 2.5-Audio, Dynamic-SUPERB Phase-2, Codec-SUPERB), and mentoring research on LLMs for RAG efficiency and their inherent limits.

Feel free to reach out to me at d12942018 [at] ntu.edu.tw, or find me on LinkedIn, Scholar, GitHub, 𝕏.

Research Highlights * equal contribution

[1]
MetaBench-Harness: Unlocking End-to-End Optimization of Benchmark Harnesses
Xuanjun Chen, Hua-Hsuan Chen, Wei-Chung Lu, Yinghao Ma, Jyh-Shing Roger Jang, Hung-yi Lee
Technical Report, Sep. 2026 bib · arXiv
[2]
Can LLM Agents Automate Reinforcement Learning for Text-to-Speech?
Xuanjun Chen, Zixiong Su, Hao Shi, Chang Zeng, Kai Li, Jyh-Shing Roger Jang, Hung-yi Lee
Technical Report, Sep. 2026 bib
[3]
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
IEEE TASLP 2026 bib · arXiv · IEEE · Project · HF · Code
[4]
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 (Long Oral) bib · arXiv
[5]
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 · IEEE
[6]
CodaRAG: Connecting the Dots with Associativity Inspired by Complementary Learning
Cheng-Yen Li*, Xuanjun Chen*, Claire Lin, Wei-Yu Chen, Wenhua Nie, Hung-yi Lee, Jyh-Shing Roger Jang
ACM Trans. Intell. Syst. Technol. (ACM TIST) bib · arXiv
[7]
Only Ask What You Don't Know: Grounded Delta Planning for Efficient Multi-step RAG
Wei-Chieh Chou*, Xuanjun Chen*, Jian-Ren Lin, Claire Lin, Hung-yi Lee, Jyh-Shing Roger Jang
COLM 2026 bib · arXiv
[8]
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
IEEE TASLP 2026 bib · arXiv · IEEE · Code
[9]
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
[10]
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 Best Paper Award bib · arXiv · Anthology
[11]
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 Best Student Paper nominee bib · arXiv · Code
[12]
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
[13]
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
[14]
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 · Anthology · Leaderboard · Code · HF
[15]
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
[16]
Towards audio language modeling-an overview
Haibin Wu, Xuanjun Chen, Yi-Cheng Lin, Kai-wei Chang, Ho-Lam Chung, Alexander Liu, Hung-yi Lee
Technical Report, Feb. 2024 bib · arXiv · Awesome

Experience

  • : Lead Student Researcher, NVIDIA Academic Grant Program, Taipei, Taiwan
  • : Research Intern, Shanda Group, Tokyo, Japan
  • : Ph.D. in Communication EngineeringCommunication Engineering, National Taiwan University ·  GPA 4.3/4.3
  • : M.S. in Computer ScienceComputer Science, National Taiwan University ·  GPA 4.19/4.3
  • : B.S. in Computer ScienceComputer Science, Taiwan Tech ·  GPA 4.11/4.3

Selected Honors & Service

Research and Academic Honors

  • : IEEE Signal Processing Society Scholarship One of dozens of international recipients
  • : NVIDIA Academic Grant Recipient Awarded dedicated GPU compute via competitive global selection
  • : NTU Mr. Wen Tzu-Hsiang Memorial Scholarship One of nine recipients at NTU
  • : Best Student Paper nominee The IEEE Automatic Speech Recognition and Understanding Workshop
  • : Best Paper Award The 37th Conference on Computational Linguistics and Speech Processing
  • : Student Travel Grants Google APAC 2024, ACLCLP 2025 & NSTC Subsidy 2025
  • : CTCI Foundation Science and Technology Scholarship Research Scholarship 2025 & Bursary Award 2024
  • : Ranked 3rd of 42 worldwide On the LA track of ASVspoof 2021 challenge
  • : Taipei City Guangdong Association Scholarship Awarded across six academic years
  • : Certificate of Achievement Top 5% in CSIE, Taiwan Tech, across three semesters
  • : 3rd Prize, SZIIT Academic Award Top 20% of students
  • : National Encouragement Scholarship Ministry of Education

International Event Organizer, Speaker & Reviewer