Abstract
A method for computing and sharpening angular spectra, derived from low-order ambisonic signals, is presented in this paper, which is intended for high-resolution directional sound-field visualisation. The method relies on a re-assignment principle, whereby the directional energy for each grid point is assigned to a new direction, which corresponds to a direction-of-arrival (DoA) estimate within a spatially-localised region, centred around the respective grid point. This leads to the concentration of energy around the true sources, and hence, to sharper angular spectra than that of steered response power (SRP) beamformers of maximum directivity, with the same order of ambisonic input. It is demonstrated that the proposed method, when using low-order input, can achieve similar results to the SRP approach of much higher order.
| Original language | English |
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| Title of host publication | 44th IEEE International Conference on Acoustics, Speech, and Signal Processing, ICASSP 2019; Brighton; United Kingdom; 12-17 May 2019 : Proceedings |
| Publisher | IEEE |
| Pages | 576-580 |
| Number of pages | 5 |
| ISBN (Electronic) | 978-1-4799-8131-1 |
| ISBN (Print) | 978-1-4799-8132-8 |
| DOIs | |
| Publication status | Published - 1 May 2019 |
| MoE publication type | A4 Article in a conference publication |
| Event | IEEE International Conference on Acoustics, Speech, and Signal Processing - Brighton, United Kingdom Duration: 12 May 2019 → 17 May 2019 Conference number: 44 |
Publication series
| Name | Proceedings of the IEEE International Conference on Acoustics, Speech, and Signal Processing |
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| ISSN (Print) | 1520-6149 |
| ISSN (Electronic) | 2379-190X |
Conference
| Conference | IEEE International Conference on Acoustics, Speech, and Signal Processing |
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| Abbreviated title | ICASSP |
| Country/Territory | United Kingdom |
| City | Brighton |
| Period | 12/05/2019 → 17/05/2019 |
Keywords
- sound-field visualisation
- spatial sharpening
- Ambisonics
- spherical harmonic domain