Julius Richter

Email:

Position:
Research / Technical Staff

Visiting Research Scientist
Education:
Ph.D. in Computer Science, University of Hamburg, Germany, 2025
Research Area:
- Speech & Audio
External Links:
- Google Scholar

Julius' Quick Links

Biography
Other Publications

Biography

Julius's research interests include generative models and multimodal learning for audio-visual understanding and restoration. During his Ph.D., he developed novel diffusion-based generative approaches for single-channel speech enhancement. Prior to joining MERL, he was a postdoctoral researcher at Meta Superintelligence Labs.
Other Publications
- Julius Richter, Danilo de Oliveira and Timo Gerkmann, "EDM2SE: A Magnitude-Preserving Network Architecture for Diffusion-Based Speech Enhancement", Proceedings of the IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP), 2026.
  BibTeX
  - @Inproceedings{Richter2026ICASSPEDM2SE,
  - author = {Richter, Julius and de Oliveira, Danilo and Gerkmann, Timo},
  - title = {{EDM2SE}: A Magnitude-Preserving Network Architecture for Diffusion-Based Speech Enhancement},
  - booktitle = {Proceedings of the IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP)},
  - year = 2026
  - }
- Jean-Marie Lemercier, Julius Richter, Simon Welker, Eloi Moliner, Vesa Välimäki and Timo Gerkmann, "Diffusion Models for Audio Restoration", IEEE Signal Processing Magazine, Vol. 41, No. 6, pp. 72-84, 2025.
  BibTeX
  - @Article{Lemercier2025SPMDiffusion,
  - author = {Lemercier, Jean-Marie and Richter, Julius and Welker, Simon and Moliner, Eloi and V{\"a}lim{\"a}ki, Vesa and Gerkmann, Timo},
  - title = {Diffusion Models for Audio Restoration},
  - journal = {IEEE Signal Processing Magazine},
  - year = 2025,
  - volume = 41,
  - number = 6,
  - pages = {72--84}
  - }
- Julius Richter, Danilo de Oliveira and Timo Gerkmann, "Investigating Training Objectives for Generative Speech Enhancement", Proceedings of the IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP), 2025.
  BibTeX
  - @Inproceedings{Richter2025ICASSPObjectives,
  - author = {Richter, Julius and de Oliveira, Danilo and Gerkmann, Timo},
  - title = {Investigating Training Objectives for Generative Speech Enhancement},
  - booktitle = {Proceedings of the IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP)},
  - year = 2025
  - }
- Julius Richter, Till Svajda and Timo Gerkmann, "ReverbFX: A Dataset of Room Impulse Responses Derived from Reverb Effect Plugins for Singing Voice Dereverberation", Proceedings of the ITG Conference on Speech Communication, 2025.
  BibTeX
  - @Inproceedings{Richter2025ITGReverbFX,
  - author = {Richter, Julius and Svajda, Till and Gerkmann, Timo},
  - title = {{ReverbFX}: A Dataset of Room Impulse Responses Derived from Reverb Effect Plugins for Singing Voice Dereverberation},
  - booktitle = {Proceedings of the ITG Conference on Speech Communication},
  - year = 2025
  - }
- Danilo de Oliveira, Julius Richter, Jean-Marie Lemercier, Simon Welker and Timo Gerkmann, "Non-intrusive Speech Quality Assessment with Diffusion Models Trained on Clean Speech", Proceedings of Interspeech, 2025.
  BibTeX
  - @Inproceedings{deOliveira2025InterspeechLikelihood,
  - author = {de Oliveira, Danilo and Richter, Julius and Lemercier, Jean-Marie and Welker, Simon and Gerkmann, Timo},
  - title = {Non-intrusive Speech Quality Assessment with Diffusion Models Trained on Clean Speech},
  - booktitle = {Proceedings of Interspeech},
  - year = 2025
  - }
- Bunlong Lay, Jean-Marie Lemercier, Julius Richter and Timo Gerkmann, "Single and Few-step Diffusion for Generative Speech Enhancement", Proceedings of the IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP), 2024.
  BibTeX
  - @Inproceedings{Lay2024ICASSPFewStep,
  - author = {Lay, Bunlong and Lemercier, Jean-Marie and Richter, Julius and Gerkmann, Timo},
  - title = {Single and Few-step Diffusion for Generative Speech Enhancement},
  - booktitle = {Proceedings of the IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP)},
  - year = 2024
  - }
- Julius Richter, Yi-Chiao Wu, Steven Krenn, Simon Welker, Bunlong Lay, Shinji Watanabe, Alexander Richard and Timo Gerkmann, "EARS: An Anechoic Fullband Speech Dataset Benchmarked for Speech Enhancement and Dereverberation", Proceedings of Interspeech, 2024.
  BibTeX
  - @Inproceedings{Richter2024InterspeechEARS,
  - author = {Richter, Julius and Wu, Yi-Chiao and Krenn, Steven and Welker, Simon and Lay, Bunlong and Watanabe, Shinji and Richard, Alexander and Gerkmann, Timo},
  - title = {{EARS}: An Anechoic Fullband Speech Dataset Benchmarked for Speech Enhancement and Dereverberation},
  - booktitle = {Proceedings of Interspeech},
  - year = 2024
  - }
- Julius Richter and Timo Gerkmann, "Diffusion-based Speech Enhancement: Demonstration of Performance and Generalization", Audio Imagination Workshop at NeurIPS, 2024.
  BibTeX
  - @Inproceedings{Richter2024NeurIPSAudioImagination,
  - author = {Richter, Julius and Gerkmann, Timo},
  - title = {Diffusion-based Speech Enhancement: Demonstration of Performance and Generalization},
  - booktitle = {Audio Imagination Workshop at NeurIPS},
  - year = 2024
  - }
- Julius Richter, Simon Welker, Jean-Marie Lemercier, Bunlong Lay, Tal Peer and Timo Gerkmann, "Causal Diffusion Models for Generalized Speech Enhancement", IEEE Open Journal of Signal Processing, Vol. 5, pp. 780-789, 2024.
  BibTeX
  - @Article{Richter2024OJSPCausal,
  - author = {Richter, Julius and Welker, Simon and Lemercier, Jean-Marie and Lay, Bunlong and Peer, Tal and Gerkmann, Timo},
  - title = {Causal Diffusion Models for Generalized Speech Enhancement},
  - journal = {IEEE Open Journal of Signal Processing},
  - year = 2024,
  - volume = 5,
  - pages = {780--789}
  - }
- Bunlong Lay, Simon Welker, Julius Richter and Timo Gerkmann, "Reducing the Prior Mismatch of Stochastic Differential Equations for Diffusion-based Speech Enhancement", Proceedings of Interspeech, 2023.
  BibTeX
  - @Inproceedings{Lay2023InterspeechPriorMismatch,
  - author = {Lay, Bunlong and Welker, Simon and Richter, Julius and Gerkmann, Timo},
  - title = {Reducing the Prior Mismatch of Stochastic Differential Equations for Diffusion-based Speech Enhancement},
  - booktitle = {Proceedings of Interspeech},
  - year = 2023
  - }
- Jean-Marie Lemercier, Julius Richter, Simon Welker and Timo Gerkmann, "StoRM: A Diffusion-based Stochastic Regeneration Model for Speech Enhancement and Dereverberation", IEEE/ACM Transactions on Audio, Speech, and Language Processing, Vol. 31, pp. 2724-2737, 2023.
  BibTeX
  - @Article{Lemercier2023TASLPStoRM,
  - author = {Lemercier, Jean-Marie and Richter, Julius and Welker, Simon and Gerkmann, Timo},
  - title = {{StoRM}: A Diffusion-based Stochastic Regeneration Model for Speech Enhancement and Dereverberation},
  - journal = {IEEE/ACM Transactions on Audio, Speech, and Language Processing},
  - year = 2023,
  - volume = 31,
  - pages = {2724--2737}
  - }
- Hector Martel, Julius Richter, Kai Li, Xiaolin Hu and Timo Gerkmann, "Audio-Visual Speech Separation in Noisy Environments with a Lightweight Iterative Model", Proceedings of Interspeech, 2023.
  BibTeX
  - @Inproceedings{Martel2023InterspeechAVSep,
  - author = {Martel, Hector and Richter, Julius and Li, Kai and Hu, Xiaolin and Gerkmann, Timo},
  - title = {Audio-Visual Speech Separation in Noisy Environments with a Lightweight Iterative Model},
  - booktitle = {Proceedings of Interspeech},
  - year = 2023
  - }
- Julius Richter, Simon Welker, Jean-Marie Lemercier, Bunlong Lay, Tal Peer and Timo Gerkmann, "Speech Signal Improvement Using Causal Generative Diffusion Models", Proceedings of the IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP), 2023.
  BibTeX
  - @Inproceedings{Richter2023ICASSPSpeechImprovement,
  - author = {Richter, Julius and Welker, Simon and Lemercier, Jean-Marie and Lay, Bunlong and Peer, Tal and Gerkmann, Timo},
  - title = {Speech Signal Improvement Using Causal Generative Diffusion Models},
  - booktitle = {Proceedings of the IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP)},
  - year = 2023
  - }
- Julius Richter, Simone Frintrop and Timo Gerkmann, "Audio-Visual Speech Enhancement with Score-Based Generative Models", Proceedings of the ITG Conference on Speech Communication, 2023.
  BibTeX
  - @Inproceedings{Richter2023ITGAVScore,
  - author = {Richter, Julius and Frintrop, Simone and Gerkmann, Timo},
  - title = {Audio-Visual Speech Enhancement with Score-Based Generative Models},
  - booktitle = {Proceedings of the ITG Conference on Speech Communication},
  - year = 2023
  - }
- Julius Richter, Simon Welker, Jean-Marie Lemercier, Bunlong Lay and 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.
  BibTeX
  - @Article{Richter2023TASLPDiffusion,
  - author = {Richter, Julius and Welker, Simon and Lemercier, Jean-Marie and Lay, Bunlong and Gerkmann, Timo},
  - title = {Speech Enhancement and Dereverberation with Diffusion-Based Generative Models},
  - journal = {IEEE/ACM Transactions on Audio, Speech, and Language Processing},
  - year = 2023,
  - volume = 31,
  - pages = {2351--2364}
  - }
- Danilo de Oliveira, Julius Richter, Jean-Marie Lemercier, Tal Peer and Timo Gerkmann, "On the Behavior of Intrusive and Non-intrusive Speech Enhancement Metrics in Predictive and Generative Settings", Proceedings of the ITG Conference on Speech Communication, 2023.
  BibTeX
  - @Inproceedings{deOliveira2023ITGMetrics,
  - author = {de Oliveira, Danilo and Richter, Julius and Lemercier, Jean-Marie and Peer, Tal and Gerkmann, Timo},
  - title = {On the Behavior of Intrusive and Non-intrusive Speech Enhancement Metrics in Predictive and Generative Settings},
  - booktitle = {Proceedings of the ITG Conference on Speech Communication},
  - year = 2023
  - }
- Julius Richter, Jeanine Liebold and Timo Gerkmann, "Continuous Phoneme Recognition based on Audio-Visual Modality Fusion", Proceedings of the IEEE World Congress on Computational Intelligence, 2022.
  BibTeX
  - @Inproceedings{Richter2022WCCIAVPhoneme,
  - author = {Richter, Julius and Liebold, Jeanine and Gerkmann, Timo},
  - title = {Continuous Phoneme Recognition based on Audio-Visual Modality Fusion},
  - booktitle = {Proceedings of the IEEE World Congress on Computational Intelligence},
  - year = 2022
  - }
- Simon Welker, Julius Richter and Timo Gerkmann, "Speech Enhancement with Score-Based Generative Models in the Complex STFT Domain", Proceedings of Interspeech, 2022.
  BibTeX
  - @Inproceedings{Welker2022InterspeechComplex,
  - author = {Welker, Simon and Richter, Julius and Gerkmann, Timo},
  - title = {Speech Enhancement with Score-Based Generative Models in the Complex {STFT} Domain},
  - booktitle = {Proceedings of Interspeech},
  - year = 2022
  - }
- Guillaume Carbajal, Julius Richter and Timo Gerkmann, "Guided Variational Autoencoder for Speech Enhancement with a Supervised Classifier", Proceedings of the IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP), 2021.
  BibTeX
  - @Inproceedings{Carbajal2021ICASSPGuidedVAE,
  - author = {Carbajal, Guillaume and Richter, Julius and Gerkmann, Timo},
  - title = {Guided Variational Autoencoder for Speech Enhancement with a Supervised Classifier},
  - booktitle = {Proceedings of the IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP)},
  - year = 2021
  - }
- Guillaume Carbajal, Julius Richter and Timo Gerkmann, "Disentanglement Learning for Variational Autoencoders Applied to Audio-Visual Speech Enhancement", Proceedings of the IEEE Workshop on Applications of Signal Processing to Audio and Acoustics (WASPAA), 2021.
  BibTeX
  - @Inproceedings{Carbajal2021WASPAA,
  - author = {Carbajal, Guillaume and Richter, Julius and Gerkmann, Timo},
  - title = {Disentanglement Learning for Variational Autoencoders Applied to Audio-Visual Speech Enhancement},
  - booktitle = {Proceedings of the IEEE Workshop on Applications of Signal Processing to Audio and Acoustics (WASPAA)},
  - year = 2021
  - }
- Quan Nguyen, Julius Richter, Mikko Lauri, Timo Gerkmann and Simone Frintrop, "Improving Mix-and-Separate Training in Audio-Visual Sound Source Separation with an Object Prior", Proceedings of the International Conference on Pattern Recognition (ICPR), 2020.
  BibTeX
  - @Inproceedings{Nguyen2020ICPRAVPrior,
  - author = {Nguyen, Quan and Richter, Julius and Lauri, Mikko and Gerkmann, Timo and Frintrop, Simone},
  - title = {Improving Mix-and-Separate Training in Audio-Visual Sound Source Separation with an Object Prior},
  - booktitle = {Proceedings of the International Conference on Pattern Recognition (ICPR)},
  - year = 2020
  - }
- Julius Richter, Guillaume Carbajal and Timo Gerkmann, "Speech Enhancement with Stochastic Temporal Convolutional Networks", Proceedings of Interspeech, 2020.
  BibTeX
  - @Inproceedings{Richter2020InterspeechTCN,
  - author = {Richter, Julius and Carbajal, Guillaume and Gerkmann, Timo},
  - title = {Speech Enhancement with Stochastic Temporal Convolutional Networks},
  - booktitle = {Proceedings of Interspeech},
  - year = 2020
  - }