Development of a Rotating Source Localisation Technique based on Cyclostationary Time-Frequency Analysis

Abstract

A new approach for sound source localisation of rotating and static sources is presented, which adopts a hybrid time-frequency analysis in order to facilitate simultaneous detection of both types of sources. The analysis technique makes use of the assumption of cyclostationarity enabling the calculation of instantaneous spectra, i.e. a sound pressure spectrum at each angular position along the trajectory of the rotating sources. Adaptations of Compressed Sensing-based and DAMAS deconvolution algorithms to the framework of simultaneous sparse approximation are introduced. The results for simulated test cases comprising tonal and broadband source spectra show the capabilities of the localisation technique in comparison with reference Beamforming techniques. As this is an ongoing development further advancements are discussed.