Coding of spatio-temporal audio spectra using tree-structured directional filterbanks

We address the problem of integrating directional analysis of sound into the filterbank of a spatial audio coder, with the purpose of processing and coding with some degree of inde- pendence the plane waves traveling in different directions. A plane wave represents an elementary waveform in the spatio-temporal analysis of the sound field, the same way a complex exponential is an elementary waveform in the time domain analysis of signals. Since a two-dimensional separable filterbank is not flexible enough for this purpose, we propose a non-separable approach based on the quin- cunx filterbank with diamond-shaped filters, cascaded with a base transform filterbank. This solution provides an in- vertible and critically sampled decomposition of the spatio- temporal spectra into subbands representing the different di- rections of wave propagation.


Published in:
Proceedings of IEEE Workshop on Applications of Signal Processing to Audio and Acoustics, 277 - 280
Presented at:
2009 IEEE Workshop on Applications of Signal Processing to Audio and Acoustics, New Palz, New York, October 18-21, 2009
Year:
2009
Keywords:
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 Record created 2009-10-30, last modified 2018-03-17

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