Papers by Sergio Cavaliere
2008 International Conference on Computer Science and Software Engineering, 2008
ABSTRACT Our paper reports on an ongoing experiment aiming to use broadly principles and methods ... more ABSTRACT Our paper reports on an ongoing experiment aiming to use broadly principles and methods from virtual reality and augmented reality for didactical purposes. The specific field in which these methodologies have been proposed, studied and implemented, at a first stage, is in teaching physics, in particular, kinematics. Key idea is that of providing the observer, an elementary school student, with real time information on the kinematics of some moving object on which experiments are being carried on. This real time information will be provided by using the methods of augmented reality, that is mixing images from the real world with synthetic data; this is done just adding to the moving objects computer generated images for velocities and accelerations; thus the user may watch to a physical experiment by means of a webcam: on the computer screen he will see real bodies and superimposed to these relevant graphical annotations, mainly vectors for velocities; also virtualization is achieved by means of sonification of the events; sounds controlled by speed, varying speed (acceleration), crashes and similar are superimposed to the real scene in order to provide evidence of the events by means of augmented perception, using in this case, the acoustical channel for communicating events and parameters of the environment.
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A VME crate interconnect architecture has been developed for the Data Acquisition System of the K... more A VME crate interconnect architecture has been developed for the Data Acquisition System of the KLOE High Energy Physics experiment [1], based at INFN Laboratories in Frascati, Italy. A chain controller (ROCK Manager) can link up to 8 VME crates using a custom cable-bus. The bus protocol (Cbus) has been optimized for random-length block transfers. Data is transmitted isochronously at 10 MHz (40 Mbyte/s) using TTL differential logic. Each transaction on the Cbus is labeled by an event number, which allows the chain controller to ask for a specific data frame. Sub-event building is obtained collecting the data frames available for the requested event from all the devices on the Cbus. The chain controller has been designed around 3K and 4K family XILINX FPGAs. Dual port FIFO banks are used to decouple the VME and the Cbus data traffic. A preliminary version of the board is presented and test results are briefly discussed. I. THE CHAIN LAYOUT The DAQ System of the KLOE experiment ado...
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The accuracy of the results obtained by physical models in sound synthesis depends on the versati... more The accuracy of the results obtained by physical models in sound synthesis depends on the versatility of the computational model components. In fact, fitting a model to reality and perception is always necessary as on one hand the complex details of the physics of the source are often ignored and on the other hand it is impossible to take into account the variability of the system with respect to fine tuning, set up and adjustment. This is the paradigm of Physics-Based Sound Synthesis. Frequency warping, which consists in remapping the frequency axis in order to adjust the characteristics of the system, is certainly a can-didate method for model fitting. In several sources, as in stiff strings or membranes, frequency warping naturally arises from the model equations, at least in principle. We showed that synthesis by dispersive digital waveguides, consisting of a chain of allpass filters substituting the elementary delays, is equivalent to a non-dispersive digital waveguide cascaded...
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In this paper, we extend the definition of dyadic wavelets to include frequency warped wavelets. ... more In this paper, we extend the definition of dyadic wavelets to include frequency warped wavelets. The new wavelets are generated and the transform computed in discrete-time by alternating the Laguerre transform with perfect reconstruction filterbanks. This scheme provides the unique implementation of orthogonal or biorthogonal warped wavelets by means of rational transfer functions. We show that the discrete-time warped wavelets lead to well-defined continuous-time wavelet bases, satisfying a warped form of the two-scale equation. The shape of the wavelets is not invariant by translation. Rather, the "wavelet translates" are obtained from one another by allpass filtering. We show that the phase of the delay element is asymptotically a fractal. A feature of the warped wavelet transform is that the cut-off frequencies of the wavelets may be arbitrarily assigned while preserving a dyadic structure. The new transform provides an arbitrary tiling of the time--frequency plane, wh...
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2009 First International Conference on Advances in System Simulation, 2009
ABSTRACT This paper reports the methods and tools set up in order to deal efficiently with the de... more ABSTRACT This paper reports the methods and tools set up in order to deal efficiently with the design of a very large and complex digital electronic system. We describe the methods set up for the purpose of granting interactivity to the design of the electronics: this interactivity allows straightforward evaluation of different scenarios as well as evaluation of different what–if choices; it finally allows interactive fine tuning of the parameters of the chosen structure. The preliminary results obtained in the early stage of this project are very promising, because they result in a friendly, interactive and fast system for debugging different design choices, allowing easy comparison and also obtaining reliable figures on the performance of the overall system, measured along large time intervals as needed and subject to operating conditions which statistically would reproduce real life conditions.
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The ARGO-YBJ experiment is presently under construction at the Yangbaijing High Altitude Cosmic R... more The ARGO-YBJ experiment is presently under construction at the Yangbaijing High Altitude Cosmic Ray Laboratory (4300 m a.s.l), 90 km North to Lhasa (Tibet, Peo-ple's Republic of China). ARGO will study foundamental issues in cosmic ray and astroparticle physics by detecting small size air showers. The detector covers 74 × 78 m 2 with single layer Resistive Plate Counters (RPCs), surrounded by a partially instrumented guard ring. The ARGO Level-1 Data Acquisition System is designed around custom protocols and hardware read-out controllers developed to achieve high data transfer rate and event building capability without software overhead. In this paper we describe the architecture of the system and the hardware developed in the Level 1 environment to acquire the detector's data.
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Nuclear Instruments and Methods in Physics Research, 1981
ABSTRACT
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The ARGO-YBJ experiment is presently under construction at the Yangbaijing High Altitude Cosmic R... more The ARGO-YBJ experiment is presently under construction at the Yangbaijing High Altitude Cosmic Ray Laboratory (4300 m a.s.l), 90 km North to Lhasa (Tibet, People's Republic of China). ARGO will study foundamental issues in cosmic ray and astroparticle physics by detecting small size air showers. The detector covers 74 × 78 m2 with single layer Resistive Plate Counters (RPCs), surrounded
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2008 International Conference on Computer Science and Software Engineering, 2008
ABSTRACT Our paper reports on an ongoing experiment aiming to use broadly principles and methods ... more ABSTRACT Our paper reports on an ongoing experiment aiming to use broadly principles and methods from virtual reality and augmented reality for didactical purposes. The specific field in which these methodologies have been proposed, studied and implemented, at a first stage, is in teaching physics, in particular, kinematics. Key idea is that of providing the observer, an elementary school student, with real time information on the kinematics of some moving object on which experiments are being carried on. This real time information will be provided by using the methods of augmented reality, that is mixing images from the real world with synthetic data; this is done just adding to the moving objects computer generated images for velocities and accelerations; thus the user may watch to a physical experiment by means of a webcam: on the computer screen he will see real bodies and superimposed to these relevant graphical annotations, mainly vectors for velocities; also virtualization is achieved by means of sonification of the events; sounds controlled by speed, varying speed (acceleration), crashes and similar are superimposed to the real scene in order to provide evidence of the events by means of augmented perception, using in this case, the acoustical channel for communicating events and parameters of the environment.
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Journal of Renal Nutrition, 1996
A data acquisition system for a real time large scale application (more than 30,000 acquisition c... more A data acquisition system for a real time large scale application (more than 30,000 acquisition channels) has been developed. This required the design of two custom busses (AUXbus and Cbus), a readout controller (ROCK) and a read-out controller manager (ROCK manager). A crate containing a VME CPU, a ROCK, (1-16) front end slave boards and an Auxbus backplane comprise one
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The ARGO-YBJ experiment has been designed in order to study the cosmic rays, mainly cosmic gamma-... more The ARGO-YBJ experiment has been designed in order to study the cosmic rays, mainly cosmic gamma-radiation, at an energy threshold of ~100GeV, by means of the detection of small size air showers. This goal will be achieved by operating a full coverage array detector in the Yangbajing Laboratory (Tibet, China) at 4300m a. s. l. The ARGO DAQ is based on a high speed event driven architecture previously developed for high energy physics experiments on colliders.
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Signal Processing, 1982
ABSTRACT
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IEEE Transactions on Nuclear Science, 2002
The ARGO-YBJ experiment is presently under construction at the Yangbaijing High-Altitude Cosmic R... more The ARGO-YBJ experiment is presently under construction at the Yangbaijing High-Altitude Cosmic Ray Laboratory (4300 m a.s.l), 90 km north to Lhasa (Tibet, People's Republic of China). ARGO will study fundamental issues in cosmic ray and astroparticle physics by detecting small-size air showers. The detector covers 74 × 78 m2 with single layer resistive plate counters (RPCs), surrounded by a
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IEEE Transactions on Nuclear Science, 2000
A read-out controller (ROCK) has been developed for the data acquisition system of the KLOE High ... more A read-out controller (ROCK) has been developed for the data acquisition system of the KLOE High Energy Physics experiment, based in Frascati, Italy. The ROCK performs data acquisition in an event-driven fashion on the AUXbus, a custom high speed parallel bus. The AUXbus's main features are data cycles labeled by event number, sparse data scan operations and an asynchronous protocol
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EURASIP Journal on Advances in Signal Processing, 2004
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Papers by Sergio Cavaliere