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Development of a re-configurable ambisonic decoder for irregular loudspeaker configuration

Development of a re-configurable ambisonic decoder for irregular loudspeaker configuration

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This study reports a heuristic genetic algorithm to determine the decoding parameters in a first-order ambisonic system for reconstructing a three-dimensional sound field with an arbitrary quad speaker configuration. On this basis, a hardware prototype has been developed using a field programmable gate array (FPGA) to decode ambisonic signals that are encoded in the standard B-format. To allow direct coupling with digital audio sources, the input and output channels of the decoder are implemented with the I2S interface. Evaluations reveal that the decoding parameters derived by this method are superior to existing approaches in terms of flexibility in loudspeaker configuration and optimisation of some of the essential factors in surround sound reconstruction.

Inspec keywords: field programmable gate arrays; decoding; heuristic programming; audio coding; loudspeakers; genetic algorithms; acoustic field; reconfigurable architectures; acoustic signal processing; signal reconstruction

Other keywords: direct coupling; irregular loudspeaker configuration; first-order ambisonic system; decoding parameters; hardware prototype; digital audio sources; three-dimensional sound field; heuristic genetic algorithm; arbitrary quad speaker configuration; field programmable gate array; surround sound reconstruction; encoding; re-configurable ambisonic decoder; standard B-format

Subjects: Digital signal processing; Optimisation techniques; Signal processing and detection; Audio equipment and systems; Speech and audio coding

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