Simon Welker, MSc

Research interests

Publications

1. Jean-Marie Lemercier, Julius Richter, Simon Welker, Eloi Moliner, Vesa Välimäki, Timo Gerkmann, "Diffusion Models for Audio Restoration: A review [Special Issue On Model-Based and Data-Driven Audio Signal Processing]," IEEE Signal Processing Magazine, vol. 41, no. 6, pp. 72-84, Nov. 2024.
   [DOI] [arXiv]
2. Danilo de Oliveira, Simon Welker, Julius Richter, Timo Gerkmann, "The PESQetarian: On the Relevance of Goodhart's Law for Speech Enhancement," ISCA Interspeech, Kos, Greece, September 2024.
   [DOI] [arXiv]
3. Julius Richter, Yi-Chiao Wu, Steven Krenn, Simon Welker, Bunlong Lay, Shinji Watanabe, Alexander Richard, Timo Gerkmann, "EARS: An Anechoic Fullband Speech Dataset Benchmarked for Speech Enhancement and Dereverberation," ISCA Interspeech, Kos, Greece, September 2024.
   [DOI] [arXiv] [Audio] [Code]
4. Simon Welker, Tal Peer, Henry N. Chapman, Timo Gerkmann, "Live Iterative Ptychography with projection-based algorithms," IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP), Seoul, Republic of Korea, April 2024.
   [DOI] [arXiv] [Code]
5. Tal Peer, Simon Welker, Johannes Kolhoff, Timo Gerkmann, "A Flexible Online Framework for Projection-Based STFT Phase Retrieval," IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP), Seoul, Republic of Korea, April 2024.
   [DOI] [arXiv]
6. Navin Raj Prabhu, Bunlong Lay, Simon Welker, Nale Lehmann-Willenbrock, Timo Gerkmann, "EMOCONV-Diff: Diffusion-Based Speech Emotion Conversion for Non-Parallel and in-the-Wild Data," IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP), Seoul, Republic of Korea, April 2024.
   [DOI] [arXiv]
7. Julius Richter, Simon Welker, Jean-Marie Lemercier, Bunlong Lay, Tal Peer, Timo Gerkmann, "Causal Diffusion Models for Generalized Speech Enhancement," IEEE Open Journal of Signal Processing, vol. 5, pp 780-789, 2024.
   [DOI] [Audio]
8. Simon Welker, Henry N. Chapman, Timo Gerkmann, "DriftRec: Adapting diffusion models to blind JPEG restoration," IEEE Transactions on Image Processing (TIP), vol. 33, pp 2795-2807, 2024.
   [DOI] [arXiv]
9. Eloi Moliner, Jean-Marie Lemercier, Simon Welker, Timo Gerkmann, Vesa Välimäki, "BUDDy: Single-Channel Blind Unsupervised Dereverberation with Diffusion Models," 18th International Workshop on Acoustic Signal Enhancement (IWAENC), Aalborg, Denmark, September 2024.
   [DOI] [arXiv] [Audio] [Code]
10. Jean-Marie Lemercier, Simon Welker, Timo Gerkmann, "Diffusion Posterior Sampling for Informed Single-Channel Dereverberation," IEEE Workshop on Applications of Signal Processing to Audio and Acoustics (WASPAA), New Paltz, NY, USA, 2023.
    [DOI] [arXiv]
11. Jean-Marie Lemercier, Julius Richter, Simon Welker, Timo Gerkmann, "StoRM: A Diffusion-based Stochastic Regeneration Model for Speech Enhancement and Dereverberation," IEEE/ACM Transactions on Audio, Speech, Language Processing, vol. 31, pp. 2724 -2737, 2023.
    [DOI] [arXiv] [Audio] [Code]
12. Julius Richter, Simon Welker, Jean-Marie Lemercier, Bunlong Lay, Timo Gerkmann, "Speech Enhancement and Dereverberation with Diffusion-Based Generative Models," IEEE/ACM Transactions on Audio, Speech, and Language Processing, vol. 31, pp. 2351 - 2364, 2023.
    [DOI] [arXiv] [Audio] [Code]
13. Julius Richter, Simon Welker, Jean-Marie Lemercier, Bunlong Lay, Tal Peer, Timo Gerkmann, "Speech Signal Improvement Using Causal Generative Diffusion Models," IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP), Rhodes, Greece, June 2023.
    [DOI] [arXiv] [Audio]
14. Tal Peer, Simon Welker, Timo Gerkmann, "DiffPhase: Generative Diffusion-Based STFT Phase Retrieval," IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP), Rhodes, Greece, June 2023.
    [DOI] [arXiv]
15. Bunlong Lay, Simon Welker, Julius Richter, Timo Gerkmann "Reducing the Prior Mismatch of Stochastic Differential Equations for Diffusion-based Speech Enhancement", ISCA Interspeech, Dublin, Ireland, August 2023.
    [DOI] [arXiv] [Audio] [Code]
16. Jean-Marie Lemercier, Julius Richter, Simon Welker, Timo Gerkmann, "Analysing Diffusion-based Generative Approaches versus Discriminative Approaches for Speech Restoration," IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP), Rhodes, Greece, June 2023.
    [DOI] [arXiv]
17. Simon Welker, Julius Richter, Timo Gerkmann, "Speech Enhancement with Score-Based Generative Models in the Complex STFT Domain," ISCA Interspeech, Incheon, Korea, Sep. 2022.
    [DOI] [arXiv] [Audio] [Code]
18. Simon Welker, Henry N. Chapman, Timo Gerkmann, "Blind Drifting: Diffusion models with a linear SDE drift term for blind image restoration tasks," NeurIPS 2022 Workshop "The Symbiosis of Deep Learning and Differential Equations II" (DLDE II), December 2022.
    [OpenReview]
19. Tal Peer, Simon Welker, Timo Gerkmann, "Beyond Griffin-Lim: Improved Iterative Phase Retrieval for Speech," 17th International Workshop on Acoustic Signal Enhancement (IWAENC), Bamberg, Germany, September 2022.
    [DOI] [arXiv]
20. Simon Welker, Tal Peer, Henry N. Chapman, Timo Gerkmann, "Deep Iterative Phase Retrieval for Ptychography," IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP), Singapore, May 2022.
    [DOI] [arXiv]