The purpose of this article is to detail and evaluate three alternative approaches to soundfield visualization, which all employ the use of spatially localized active-intensity (SLAI) vectors. These SLAI vectors are of particular interest, as they allow direction-of-arrival (DoA) estimates to be extracted in multiple spatially localized sectors, such that a sound source present in one sector has reduced influence on the DoA estimate made in another sector. These DoA estimates may be used to visualize the sound-field by either: (I) directly depicting the estimates as icons, with their relative size dictated by the corresponding energy of each sector; (II) generating traditional activity maps via histogram analysis of the DoA estimates; or (III) by using the DoA estimates to reassign energy and subsequently sharpen traditional beamformer-based activity maps. Since the SLAI-based DoA estimates are continuous, these approaches are inherently computationally efficient, as they forego the need for dense scanning grids to attain high-resolution imaging. Simulation results also show that these SLAI-based alternatives outperform traditional active-intensity and beamformer-based approaches, for the majority of cases.

No abstract

No abstract

Advanced automotive applications like Active Noise Cancellation (ANC) and Individual Listening Zones (ILZ) require a high number of transducers (i.e., microphones, accelerometers, and loudspeakers) usually employed as arrays. Also outside the automotive field, transducer arrays are widely employed in several applications as teleconferencing systems, industrial and civil noise and vibration monitoring. Automotive Audio Bus (A 2 B) is an audio transport protocol that solves the latest requirements of the automotive and industrial field. A 2 B allows transporting up to 32 channels in a multi-node daisy chain network and guarantees synchronization and low deterministic latency. This paper aims to develop a clock propagation model of an A 2 B network composed by transducer arrays. This model will be useful to evaluate the impact of the bus on the array performances. Firstly, a theoretical description of the A 2 B protocol and jitter analysis is provided. Then jitter measures were carried out on the clocks distributed along the A 2 B network. Lastly, latency introduced by nodes of the network is investigated.

No abstract