The following audio examples accompany the submission
T. Deppisch, J. Ahrens, S. Amengual Garí, P. Calamia, “Spatial Subtraction of Reflections From Room Impulse Responses Measured with a Spherical Microphone Array,” IEEE WASPAA, 2021.
We provide binaural renderings of a drum sample convolved with directional room impulse responses (DRIRs) and different modifications thereof. The DRIRs were separated into a directional component, containing only direct sound and a number of extracted reflections, and the residual, obtained after the spatial subtraction.
Small Conference Room
These examples correspond to the ones described in section 5 of the paper. The DRIR was measured in a small conference room using the Eigenmike em32 allowing up to fourth-order spherical harmonics decomposition. The DRIR is available here. In this example, the direct sound and the 8 most prominent reflections were extracted.
First, listen to the drum sample, convolved with the unmodified DRIR:
Now you can compare the extracted directional and residual components of the conventional method and the proposed method. The conventional method uses the plane-wave prototype from eq. (8) in the paper. The proposed method uses the plane-wave prototype from eq. (10) and takes into account regularized radial filtering, order truncation and spatial aliasing.
Conventional method | Proposed method | |
Directional component | ||
Residual |
The proposed method extracts the directional components more accurately, especially the loss of low-frequency content in the directional component of the conventional method is observable. Further, the more accurate extraction of the directional components allows for a more accurate subtraction of thereof, creating a more diffuse-sounding residual.
Below are further examples using two other DRIRs that are not described in the paper.
Audio Lab at Applied Acoustics Chalmers
The DRIR was measured in a small lab room using the Eigenmike em32 allowing up to fourth-order spherical harmonics decomposition. In this example, the direct sound and the 15 most prominent reflections were extracted.
First, listen to the drum sample, convolved with the unmodified DRIR:
Now you can compare the extracted directional and residual components of the conventional method and the proposed method.
Conventional method | Proposed method | |
Directional component | ||
Residual |
Foyer Hall at Applied Acoustics Chalmers
The DRIR was measured in a foyer hall using the Core Sound TetraMic allowing up to first-order spherical harmonics decomposition. In this example, the direct sound and the 3 most prominent reflections were extracted.
First, listen to the drum sample, convolved with the unmodified DRIR:
Now you can compare the extracted directional and residual components of the conventional method and the proposed method.
Conventional method | Proposed method | |
Directional component | ||
Residual |