This paper presents the phenomenon in which circularly rotating sound sources exhibit a spectral split at the center of rotation. It is shown that this spectral split occurs exclusively in the velocity field and is equivalent to the angular speed of the rotation. However, it does not affect the pressure field at the point of measurement, showing no change to the emitted spectrum of the source. To test this in both 2D and 3D, the sound field of a rapidly rotating sound source is reconstructed using Wavefield Synthesis. The reconstruction is done as faithfully as possible by minimising the discretisation artifacts using a large number of secondary sources along the circle perimeter and sphere surface respectively. The measurements taken confirm the theoretical findings. The applications of this phenomenon can range from fault analysis of rotating machines to spatial audio and may also inform on the perception of rotating sound beyond the previously determined limit.

Authors: Schmele, Timothy; Garriga, Adán
Affiliations: Eurecat, Centre Tecnològic de Catalunya, Barcelona, Spain and IMWI, Karlsruhe, Germany; Eurecat, Centre Tecnològic de Catalunya, Barcelona, Spain(See document for exact affiliation information.)
AES Convention: 154 (May 2023) Paper Number: 10657
Publication Date: May 13, 2023
Subject: VR/Devices/Synthesis

Download Now (2.8 MB)

This paper is Open Access which means you can download it for free.

No AES members have commented on this VR/Devices/Synthesis yet.

Subscribe to this discussion

To be notified of new comments on this VR/Devices/Synthesis you can subscribe to this RSS feed. Forum users should login to see additional options.

Start a discussion!

If you would like to start a discussion about this VR/Devices/Synthesis and are an AES member then you can login here:
Username:
Password:

If you are not yet an AES member and have something important to say about this VR/Devices/Synthesis then we urge you to join the AES today and make your voice heard. You can join online today by clicking here.