Gabriel Pablo Nava

Sony LSI Design Inc., SONY

Recent optical wireless acoustic sensors have demonstrated the possibility to simultaneously sense massive numbers of audio channels in real time. Although this technology has enabled the deployment of large-scale applications, it raises new challenges from the computational perspective. In this regard, Graphics Processing Units provide significant...

This paper introduces an optical wireless audio system, which takes advantage of the parallel transmission feature offered by the arrangement of LEDs and a high-speed video camera. The motivation for building such system is the limitation encountered when deploying huge arrays of sound sensors, as existent wired and RF wireless microphones are unde...

We envision the future of sound sensing as large acoustic sensor networks present in wide spaces providing highly accurate noise cancellation and ultra-realistic environmental sound recording. To achieve this, we developed a real-time system capable of recording the audio signals of large microphone arrays by exploiting the parallel-data transmissi...

Sensing sound fields at multiple locations often may become considerably time consuming and expensive when large wired sensor arrays are involved. Although several techniques have been developed to reduce the number of necessary sensors, less work has been reported on efficient techniques to acquire the data from all the sensors. This paper introdu...

Optical communication through light-emitting diodes (LEDs) and video cameras is rapidly gaining attention due to the increasing pervassiveness of those devices, and because of its potential data capacity. However, the communication quality is greatly compromised by the low resolution of the imaging sensor which produces blurred images of the LEDs a...

Optical communication through light-emitting diodes (LEDs) and video cameras is rapidly gaining attention due to the increasing pervassiveness of those devices, and because of its potential data capacity. However, the communication quality is greatly compromised by the low resolution of the imaging sensor which produces blurred images of the LEDs a...

Sensing sound fields at multiple locations often may become considerably time consuming and expensive when large wired sensor arrays are involved. Although several techniques have been developed to reduce the number of necessary sensors, less work has been reported on efficient techniques to acquire the data from all the sensors. This paper introdu...

As numerical simulations of large-scale complex-shape sound fields have become affordable by powerful computers and algorithms, there is an increasing interest on new methods of in situ assessment of acoustic impedance and absorption coefficients to yield accurate sound predictions. Among the existent approaches, those based on inverse boundary fra...

In most audio-visual multimedia applications, conventional stereo loudspeakers have been used to implement auditory displays. However, a fundamental problem with this kind of displays is that only the listeners situated at the sweet spot and over the symmetrical axis of the loudspeaker array are able to accurately localize the sound images. Althoug...

Most multimedia applications involving auditory displays for digital video contents rely on audio signal processing and conventional stereo loudspeakers to create sound images on the screens. Although a number of examples of these techniques have been reported in the literature showing successful results for narrow listening areas, it seems that th...

A method for in situ estimation of the acoustic impedance of surfaces in interiors is introduced in this paper. The key difference with traditional in situ measurement techniques is the use of an inverse acoustic boundary framework which allows us to overcome some geometry constraints from previous methods (such as the planar-surface requirement an...

Traditional videoconferencing systems that work on the basis of face-to-face configurations allow the use of standard 2-channel stereo loudspeakers in order to achieve sound-image localization by the users. In contrast, immersive systems that do not constraint the users to a face-to-face viewpoint introduce new challenges in their acoustic design....

Prediction of acoustic response and modal analysis in the interior of rooms are often performed using numerical simulations which require the assessment of boundary values related to the acoustic properties of the materials. However, the traditional techniques to measure the acoustic properties in situ suffer from geometrical constraints that preve...

In situ measurement of acoustic impedance is traditionally performed using pairs of microphones located close to the test surface. However, this method becomes troublesome if inaccessible complex-shaped surfaces, such as those in a real room, are considered. To overcome this problem a method to estimate the normal acoustic impedance on the interior...

We present a method based on the inverse boundary element method (IBEM) for the in-situ estimation of normal acoustic impedances of the surfaces in a room. As input to the inverse process, this technique uses the geometry of the interior space, the position and strength of the sound source, and a set of sound pressures measured at random positions...

報告番号: 甲22805 ; 学位授与年月日: 2007-03-22 ; 学位の種別: 課程博士 ; 学位の種類: 博士(情報理工学) ; 学位記番号: 博情第135号 When acoustic engineers make analysis of the sound propagation with numerical methods,　they use values of the acoustic properties of the objects to describe the behavior of　a given object when a sound wave hits its surface. In other words, these numerical methods　o...

This paper presents a new approach to piano onset detection based on a convolutional kernel modeled from the salient characteristics of the transients of piano onsets. Preliminary experiments performed with piano recordings, show that our method promises to achieve reasonable high level of onset detection even in complex signals such as piano jazz...