Xuanjun Chen

Xuanjun Chen (陳炫均)

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

Hello! I am a Ph.D. student at the EECS College, National Taiwan University, advised by Profs. Hung-yi Lee and Jyh-Shing Roger Jang. My research focuses on Speech & Audio Processing and Large Language Models, specifically audio understanding, audio generation, deepfake speech, and agentic LLMs. My work is supported by  NVIDIA Academic Grant and IEEE SPS IEEE SPS Scholarship. I have published over 20 peer-reviewed papers, 15 as first/co-first author, across top ML/NLP (ICLR, ACL, COLM, TIST) and speech (TASLP, ICASSP, INTERSPEECH, etc.) venues. My research received the Best Paper Award at ROCLING 2025 and Best Paper Nominations at IEEE ASRU 2025 and ISCSLP 2026. I am actively looking for a 2027 research internship!

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

Research Highlights

See all on Google Scholar or browse by topic.

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, Oct. 2026

What Does LALM Post-training Learn? Rethinking Audio Understanding and Reasoning Capabilities

Hua-Hsuan Chen*, Xuanjun Chen*, Wei-Chung Lu, Chih-Kai Yang, Yu-Xiang Lin, Sung-Feng Huang, Haibin Wu, Hung-yi Lee

Technical Report, Oct. 2026

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, Oct. 2026

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 2026JCR Q1, IF 5.173 Citations as of Oct. 2026

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 2025Accept Rate 32.08%99 Citations as of Oct. 2026

Codec-SUPERB: An In-Depth Analysis of Sound Codec Models

Haibin Wu*, Ho-Lam Chung*, Yi-Cheng Lin†, Yuan-Kuei Wu†, Xuanjun Chen†, ..., Alexander H. Liu, Hung-yi Lee

ACL Findings 2024Accept Rate 22.1%311 GitHub Stars

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. 202488 Citations as of Oct. 2026

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 TIST 2026JCR Q1, IF 10.7

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 2026Accept Rate 29.1%

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

IEEE TASLP 2026JCR Q1, IF 5.1

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 2025Best Student Paper Nomination (Top 2.5%)

Singing Voice Graph Modeling for SingFake Detection

Xuanjun Chen, Haibin Wu, Jyh-Shing Roger Jang, Hung-yi Lee

INTERSPEECH 2024 (Oral)Lightning Talk @ SLT '2435 Citations as of Oct. 2026

Experience

  • : Lead Student Researcher, NVIDIA Academic Grant Program, Taipei, Taiwan
  • : Research Intern, Shanda Group, Tokyo, Japan
  • : Ph.D. in Communication EngineeringCommunication Eng., 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

See all on the Honors page.

Research and Academic Honors

  • : NVIDIA Academic Grant Awarded dedicated GPU compute via competitive selection by NVIDIA
  • : IEEE SPS Scholarship One of dozens of recipients worldwide from the IEEE Signal Processing Society
  • : Selected Outstanding Paper (ISCSLP 2026) Selected 8 out of 110 accepted papers (Top 7%)
  • : Best Student Paper Nomination (ASRU 2025) Selected 11 out of 447 submitted papers (Top 2.5%)
  • : Best Paper Award (ROCLING 2025) Selected 1 out of 36 accepted papers (Top 2.8%)
  • : CTCI Foundation Science and Technology Scholarship Research Scholarship for Overseas Students
  • : Google Student Travel Grant Sponsored by Google Asia Pacific to present at ICASSP 2024
  • : 3rd Place Worldwide, ASVspoof 2021 Challenge On the LA track of ASVspoof 2021 challenge (out of 42 teams)
  • : Dean’s List (3 terms) Certificate of Achievement for the top 5% of CSIE students, Taiwan Tech

Service and Outreach