A simple measurement system (MS) is developed to perform sound localization on a plane and evaluate its performances with specific attention to calibration and uncertainty evaluation. The sensing element is composed of two microphones mounted at the left and right ears on a cap. The localization of sound source is obtained by the estimation of the delay between the time instants of arrival of the sound to the two microphones, through a cross-correlation technique. The principle of this paper is described in mathematical terms and is experimentally validated in the azimuthal angle (θ) range ±90° at three different distances between the microphones. The MS has a nonlinear response over the whole range, on the other hand it can be considered linear within plusmn;15°. In addition, the sensor presents a low discrimination threshold (2°). The uncertainty evaluation of the MS is performed using the propagation of uncertainty and the Monte Carlo method: simulations show an uncertainty < ∼ 5° in the range ±90°. The characteristic of wearability, typical feature of sensors used to perform early detection of disorders, the good accuracy and resolution allow the chance to introduce the MS in the field of developmental psychology and, in particular, as a support for early diagnosis of pervasive developmental disorders (e.g., autism spectrum disorders)

Calibration and uncertainty evaluation using monte carlo method of a simple 2D sound localization system

Schena E;Silvestri S
2013-01-01

Abstract

A simple measurement system (MS) is developed to perform sound localization on a plane and evaluate its performances with specific attention to calibration and uncertainty evaluation. The sensing element is composed of two microphones mounted at the left and right ears on a cap. The localization of sound source is obtained by the estimation of the delay between the time instants of arrival of the sound to the two microphones, through a cross-correlation technique. The principle of this paper is described in mathematical terms and is experimentally validated in the azimuthal angle (θ) range ±90° at three different distances between the microphones. The MS has a nonlinear response over the whole range, on the other hand it can be considered linear within plusmn;15°. In addition, the sensor presents a low discrimination threshold (2°). The uncertainty evaluation of the MS is performed using the propagation of uncertainty and the Monte Carlo method: simulations show an uncertainty < ∼ 5° in the range ±90°. The characteristic of wearability, typical feature of sensors used to perform early detection of disorders, the good accuracy and resolution allow the chance to introduce the MS in the field of developmental psychology and, in particular, as a support for early diagnosis of pervasive developmental disorders (e.g., autism spectrum disorders)
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.12610/5563
 Attenzione

Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo

Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 12
  • ???jsp.display-item.citation.isi??? ND
social impact