In an urban environment, vehicles can opportunistically exploit in- frastructure through open Acc... more In an urban environment, vehicles can opportunistically exploit in- frastructure through open Access Points (APs) to efficiently com- municate with other vehicles. This is to avoid long wireless ad hoc paths, and to alleviate congestion in the wireless grid. Analytic and simulation models are used to optimize the communications and networking strategies. For realistic results, one important challenge is the accurate representation of traffic mobility patterns. In this paper we introduce realistic vehicular mobility traces of downtown Portland, Oregon, obtained from extremely detailed large scale traffic simulations performed at the Los Alamos National Lab- oratories (LANL). To the best of our knowledge, these are among the most accurate synthetic motion traces available for study, with the exception of actual car trace measurements. The new mobility model is used to evaluate AODV [1] in flat and opportunistic in- frastructure routing. To assess the importance of a realistic mobil- ity model for this evaluation, we compare these results with those obtained with CORSIM [2] traces. The paper makes the following contributions: (a) introduction of efficient, opportunistic strategies for extending the AP infrastruc- ture to use vehicle to vehicle paths, and (b) assessment of different mobility models - CORSIM traces and LANL’s realistic vehicular traces - in the modeling of different routing strategies.
2013 IEEE International Conference on Acoustics, Speech and Signal Processing, 2013
ABSTRACT A computational model for prediction of localisation uncertainty of phantom auditory sou... more ABSTRACT A computational model for prediction of localisation uncertainty of phantom auditory sources is proposed. The interaural level and time difference pairs due to point sources in free field are used as a reference. The mismatch between these “natural” pairs and interaural time and level difference pairs elicited by phantom sources is quantified by means of the 0.5-norm distance, which is justified on psychoacoustic grounds. The model is validated by results of subjective listening tests, achieving a high level of correlation with experimental data.
... Enzo De Sena, Hüseyin Hacıhabibo˘glu and Zoran Cvetkovic Centre for Digital Signal Processing... more ... Enzo De Sena, Hüseyin Hacıhabibo˘glu and Zoran Cvetkovic Centre for Digital Signal Processing Research (CDSPR) King's College London Strand, WC2R 2LS, London, United Kingdom 1e.desena|huseyin.hacihabiboglu|zoran.cvetkovicl@kcl.ac.uk ABSTRACT ...
A Room Impulse Response (RIR) shows a complex time-frequency structure, due to the presence of so... more A Room Impulse Response (RIR) shows a complex time-frequency structure, due to the presence of sound reflections and room resonances at low frequencies. Many acoustic signal enhancement applications, such as acoustic feedback cancellation, dereverberation and room equalization, require simple yet accurate models to represent a RIR. Parametric modeling of room acoustics attempts at approximating the Room Transfer Function (RTF), for given positions of source and receiver inside a room, by means of rational functions in the z-domain that can be implemented through digital filters. However, conventional parametric models, such as all-zero and pole-zero models, have some limitations. In this presentation, a particular fixed-pole Infinite Impulse Response (IIR) filter based on Orthonormal Basis Functions (OBFs) is used as an alternative, motivated by its analogy to the physical definition of the RIR as a Green's function of the acoustic wave equation. An accurate estimation of the mo...
IEEE Transactions on Audio, Speech, and Language Processing, 2000
ABSTRACT This paper presents a systematic framework for the analysis and design of circular multi... more ABSTRACT This paper presents a systematic framework for the analysis and design of circular multichannel surround sound systems. Objective analysis based on the concept of active intensity fields shows that for stable rendition of monochromatic plane waves it is beneficial to render each such wave by no more than two channels. Based on that finding, we propose a methodology for the design of circular microphone arrays, in the same configuration as the corresponding loudspeaker system, which aims to capture inter-channel time and intensity differences that ensure accurate rendition of the auditory perspective. The methodology is applicable to regular and irregular microphone/speaker layouts, and a wide range of microphone array radii, including the special case of coincident arrays which corresponds to intensity-based systems. Several design examples, involving first and higher-order microphones are presented. Results of formal listening tests suggest that the proposed design methodology achieves a performance comparable to prior art in the center of the loudspeaker array and a more graceful degradation away from the center.
In an urban environment, vehicles can opportunistically exploit in- frastructure through open Acc... more In an urban environment, vehicles can opportunistically exploit in- frastructure through open Access Points (APs) to efficiently com- municate with other vehicles. This is to avoid long wireless ad hoc paths, and to alleviate congestion in the wireless grid. Analytic and simulation models are used to optimize the communications and networking strategies. For realistic results, one important challenge is the accurate representation of traffic mobility patterns. In this paper we introduce realistic vehicular mobility traces of downtown Portland, Oregon, obtained from extremely detailed large scale traffic simulations performed at the Los Alamos National Lab- oratories (LANL). To the best of our knowledge, these are among the most accurate synthetic motion traces available for study, with the exception of actual car trace measurements. The new mobility model is used to evaluate AODV [1] in flat and opportunistic in- frastructure routing. To assess the importance of a realistic mobil- ity model for this evaluation, we compare these results with those obtained with CORSIM [2] traces. The paper makes the following contributions: (a) introduction of efficient, opportunistic strategies for extending the AP infrastruc- ture to use vehicle to vehicle paths, and (b) assessment of different mobility models - CORSIM traces and LANL’s realistic vehicular traces - in the modeling of different routing strategies.
2013 IEEE International Conference on Acoustics, Speech and Signal Processing, 2013
ABSTRACT A computational model for prediction of localisation uncertainty of phantom auditory sou... more ABSTRACT A computational model for prediction of localisation uncertainty of phantom auditory sources is proposed. The interaural level and time difference pairs due to point sources in free field are used as a reference. The mismatch between these “natural” pairs and interaural time and level difference pairs elicited by phantom sources is quantified by means of the 0.5-norm distance, which is justified on psychoacoustic grounds. The model is validated by results of subjective listening tests, achieving a high level of correlation with experimental data.
... Enzo De Sena, Hüseyin Hacıhabibo˘glu and Zoran Cvetkovic Centre for Digital Signal Processing... more ... Enzo De Sena, Hüseyin Hacıhabibo˘glu and Zoran Cvetkovic Centre for Digital Signal Processing Research (CDSPR) King's College London Strand, WC2R 2LS, London, United Kingdom 1e.desena|huseyin.hacihabiboglu|zoran.cvetkovicl@kcl.ac.uk ABSTRACT ...
A Room Impulse Response (RIR) shows a complex time-frequency structure, due to the presence of so... more A Room Impulse Response (RIR) shows a complex time-frequency structure, due to the presence of sound reflections and room resonances at low frequencies. Many acoustic signal enhancement applications, such as acoustic feedback cancellation, dereverberation and room equalization, require simple yet accurate models to represent a RIR. Parametric modeling of room acoustics attempts at approximating the Room Transfer Function (RTF), for given positions of source and receiver inside a room, by means of rational functions in the z-domain that can be implemented through digital filters. However, conventional parametric models, such as all-zero and pole-zero models, have some limitations. In this presentation, a particular fixed-pole Infinite Impulse Response (IIR) filter based on Orthonormal Basis Functions (OBFs) is used as an alternative, motivated by its analogy to the physical definition of the RIR as a Green's function of the acoustic wave equation. An accurate estimation of the mo...
IEEE Transactions on Audio, Speech, and Language Processing, 2000
ABSTRACT This paper presents a systematic framework for the analysis and design of circular multi... more ABSTRACT This paper presents a systematic framework for the analysis and design of circular multichannel surround sound systems. Objective analysis based on the concept of active intensity fields shows that for stable rendition of monochromatic plane waves it is beneficial to render each such wave by no more than two channels. Based on that finding, we propose a methodology for the design of circular microphone arrays, in the same configuration as the corresponding loudspeaker system, which aims to capture inter-channel time and intensity differences that ensure accurate rendition of the auditory perspective. The methodology is applicable to regular and irregular microphone/speaker layouts, and a wide range of microphone array radii, including the special case of coincident arrays which corresponds to intensity-based systems. Several design examples, involving first and higher-order microphones are presented. Results of formal listening tests suggest that the proposed design methodology achieves a performance comparable to prior art in the center of the loudspeaker array and a more graceful degradation away from the center.
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Papers by Enzo De Sena
In this paper we introduce realistic vehicular mobility traces of downtown Portland, Oregon, obtained from extremely detailed large scale traffic simulations performed at the Los Alamos National Lab- oratories (LANL). To the best of our knowledge, these are among the most accurate synthetic motion traces available for study, with the exception of actual car trace measurements. The new mobility model is used to evaluate AODV [1] in flat and opportunistic in- frastructure routing. To assess the importance of a realistic mobil- ity model for this evaluation, we compare these results with those obtained with CORSIM [2] traces.
The paper makes the following contributions: (a) introduction of efficient, opportunistic strategies for extending the AP infrastruc- ture to use vehicle to vehicle paths, and (b) assessment of different mobility models - CORSIM traces and LANL’s realistic vehicular traces - in the modeling of different routing strategies.
In this paper we introduce realistic vehicular mobility traces of downtown Portland, Oregon, obtained from extremely detailed large scale traffic simulations performed at the Los Alamos National Lab- oratories (LANL). To the best of our knowledge, these are among the most accurate synthetic motion traces available for study, with the exception of actual car trace measurements. The new mobility model is used to evaluate AODV [1] in flat and opportunistic in- frastructure routing. To assess the importance of a realistic mobil- ity model for this evaluation, we compare these results with those obtained with CORSIM [2] traces.
The paper makes the following contributions: (a) introduction of efficient, opportunistic strategies for extending the AP infrastruc- ture to use vehicle to vehicle paths, and (b) assessment of different mobility models - CORSIM traces and LANL’s realistic vehicular traces - in the modeling of different routing strategies.