APSIPA Transactions on Signal and Information Processing | |
Digital acoustics: processing wave fields in space and time using DSP tools | |
Mihailo Kolundžija1  Martin Vetterli1  Francisco Pinto1  | |
[1] Swiss Federal Institute of Technology (EPFL) | |
关键词: Parametric array loudspeaker; Acoustic beamforming; Directivity model; | |
DOI : 10.1017/ATSIP.2014.13 | |
学科分类:计算机科学(综合) | |
来源: Cambridge University Press | |
【 摘 要 】
Systems with hundreds of microphones for acoustic field acquisition, or hundreds of loudspeakers for rendering, have been proposed and built. To analyze, design, and apply such systems requires a framework that allows us to leverage the vast set of tools available in digital signal processing in order to achieve intuitive and efficient algorithms. We thus propose a discrete space–time framework, grounded in classical acoustics, which addresses the discrete nature of the spatial and temporal sampling. In particular, a short-space/time Fourier transform is introduced, which is the natural extension of the localized or short-time Fourier transform. Processing in this intuitive domain allows us to easily devise algorithms for beam-forming, source separation, and multi-channel compression, among other useful tasks. The essential space band-limitedness of the Fourier spectrum is also used to solve the spatial equalization task required for sound field rendering in a region of interest. Examples of applications are shown.
【 授权许可】
Unknown
【 预 览 】
Files | Size | Format | View |
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RO201912020426414ZK.pdf | 2087KB | download |