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In this paper, we present a greedy subspace method for the acoustic echoes labeling problem, which occurs in applications such as source localization and room geometry estimation. The orthogonal projection into the null space of the microphones position matrix is used to filter and sort all possible combinations of echoes. A greedy strategy, based on the rank constraint of Euclidean distance matrices...
Recent works on reconstruction of room geometry from echoes assume that the geometry of the sensor array is known. In this paper, we show that such an assumption is not essential; echoes provide sufficient clues to reconstruct the room's and the array's geometries jointly, even from a single acoustic event. Rather than focusing on the combinatorial problem of matching the walls and the recorded echoes,...
The geometry of room acoustics is such that the reverberant signal can be seen as the same waveform emitted from multiple locations. In analogy with the rake receiver from wireless communications, we propose several beamforming strategies that exploit, rather than suppress, this additional spatio-temporal diversity. Unlike earlier work in the frequency domain, time domain designs allow to shape the...
Energy saving is one of the most important research directions in the building sector. Daily new HVAC solutions and equipments are developed aiming higher efficiency and lower fossil fuel utilisation. There are cases when only the energy quantity is taken into account and the human side of the problem is neglected. The new energy saving ideas should be analysed from thermal comfort point too. The...
This paper describes an indoor positioning method using ultra-wideband (UWB) signals from one single transmitter at a known location together with a-priori floor plan information. The position of the receiver is estimated from the signal reflections in the room walls and the direct signal path. Therefore, the algorithm is inherently robust to non-line-of-sight conditions, which are considered a key...
The geometry of an enclosure is of interest for example when synthesizing impulse responses or when studying concert halls. Recently, several approaches for estimation of the room geometry, or the reflective surfaces, have been proposed. These approaches use a priori information of the source signal for the room geometry estimation, typically, impulse response measurements. Here, a method for estimating...
Non-speech audio is a non-explored characteristic in robot localization but due to its potentiality it can yield a valuable information together with other sensorial systems. In this work, a novel robot localization method is proposed based on audio signal pattern recognition with extracted features from signal identification. To reinforce the localization, avoiding ambiguity and reducing uncertainty,...
Common acoustical poles provide a convenient way of modeling different Room Transfer Functions relative to the same environment, by retaining the resonant properties of the room itself under the form of common auto-regressive coefficients; different methods have been proposed to estimate the latter, but all need an order to be priorly established. Although, for a few room geometries, a theoretical...
Although much work has been done on characterizing indoor RF propagation, some applications require a better understanding of such behavior within the confines of a single room. In this paper, we study a medium-size conference room using a ray-tracing model. A single specific room geometry is simulated but multiple narrowband realizations are obtained over a range of frequencies centered at 2.4 GHz...
An experimentally validated finite element method is used to model the sound level in rooms at low frequencies. It is demonstrated that the dimensions of rectangular rooms strongly influence the sound pressure level difference. Additional factors were investigated which are not normally considered in the frequency range where diffuse sound field conditions can be assumed. Three effects were investigated:...
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