Department of Information and Communications Engineering

Audio signal processing

The Audio Signal Processing Research Group is working on wideband sound technology, which is extensively applicable for example in smart phones, music technology, gaming, sound reproduction, and noise control.
Acoustic measurements at the Aalto Acoustics Lab

Our research topics and projects are related to headset signal processing, loudspeakers, sound synthesis, effects processing algorithms, digital filters, musical instruments, acoustic measurements, subjective evaluation, and interactive audio systems. The emphasis of our research is on digital signal processing and machine learning methods which account for the properties of human hearing. We have collaborated with several companies, such as Genelec and Nokia Technologies. Much of our academic research is conducted in collaboration with foreign partners, such as Aalborg University, The University of Edinburgh, and Stanford University.

This research group organizes the Audio Signal Processing course at Aalto University annually in January-April. We also arrange the Audio Technology Seminar every second year (February-May). Both courses are suitable for Master's and doctoral students, who have a solid background in acoustics and digital signal processing. Additionally, we are responsible for the Noise Control course for Master's and doctoral students and for the Sound and Speech Processing course (Äänen- ja puheenkäsittely, in Finnish) for BSc students.

The Audio Signal Processing Research Group belongs to the Aalto Acoustics Lab. The research group is led by Professor Vesa Välimäki, IEEE Fellow, AES Fellow.

Latest publications

Differentiable Grouped Feedback Delay Networks for Learning Coupled Volume Acoustics

Orchisama Das, Gloria Dal Santo, Sebastian J. Schlecht, Vesa Välimäki, Zoran Cvetković 2026 IEEE Transactions on Audio, Speech and Language Processing

Four Decades of Digital Waveguides

Pablo Tablas DE PAULA, Julius O. Smith, Vesa Välimäki, Joshua D. Reiss 2026 AES: Journal of the Audio Engineering Society

Solving room impulse response inverse problems using flow matching with analytic Wiener denoiser

Kyung Yun Lee, Nils Meyer-Kahlen, Sebastian J. Schlecht, Vesa Välimäki 2026 Journal of the Acoustical Society of America

Suppression of Nyquist Ringing in FFT-Based Sample Rate Conversion

Roope Salmi, Vesa Valimaki 2026 IEEE Signal Processing Letters

Phase-Scaling Effects Using Giant FFT

Vesa Välimäki, Roope Salmi, Stefan Bilbao, Sebastian J. Schlecht, David Zicarelli, Joshua Kit Clayton 2026 AES: Journal of the Audio Engineering Society

Resampling Filter Design for Multirate Neural Audio Effect Processing

Alistair Carson, Vesa Valimaki, Alec Wright, Stefan Bilbao 2025 IEEE Transactions on Audio, Speech and Language Processing

An Octave-based Multi-Resolution CQT Architecture for Diffusion-based Audio Generation

Maurício do V. M. da Costa, Eloi Moliner Juanpere 2025 2025 IEEE 6th International Symposium on the Internet of Sounds (IS2)

FLAMO: An Open-Source Library for Frequency-Domain Differentiable Audio Processing

Gloria Dal Santo, Gian Marco De Bortoli, Karolina Prawda, Sebastian J. Schlecht, Vesa Välimäki 2025 2025 IEEE International Conference on Acoustics, Speech, and Signal Processing, ICASSP 2025 - Proceedings

Optimizing tiny colorless feedback delay networks

Gloria Dal Santo, Karolina Prawda, Sebastian J. Schlecht, Vesa Välimäki 2025 Eurasip Journal on Audio, Speech, and Music Processing

Similarity Metrics for Late Reverberation

Gloria Dal Santo, Karolina Prawda, Sebastian J. Schlecht, Vesa Välimäki 2025 Conference Record of the 58th Asilomar Conference on Signals, Systems and Computers, ACSSC 2024
More information on our research in the Aalto research portal.
Research portal
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