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Page 791 of 977 Results 7901 - 7910 of 9762

Gaetano Pasini, Pier Andrea Traverso, Domenico Mirri, Paolo Rossin
DESIGN, IMPLEMENTATION AND PERFORMANCE EVALUATION OF A FULLY PROGRAMMABLE TWIN-CHANNEL TIME INTERVAL GENERATOR

A programmable time interval generator, which is characterized by a resolution below the 50 ps, has been designed and fully implemented. The very high time-resolution is achieved by means of the synchronization between a down-counter and a digitally synthesised sinusoidal signal, whose phase can be tuned with a 14-bit resolution. The generator prototype presents two identical synchronized channels, whose outputs can be merged on the same time-axis allowing for high flexibility in the generation of the overall time interval sequence.

Aimè Lay-Ekuakille, Antonio V. Scarano
SNR LIDAR SIGNAL IMPROVEMENT BY ADAPTIVE TECNIQUES

Image filtering by Richardson-Lucy algorithm show an iterative solution for monodimensional signal deconvolution. In this paper the performance of this algorithm will verified when LIDAR signals are pre- filtere by an adaprive low-pass filter. Most intresting results, for real-time deconvolution and filtering of lidar signal, will also showed.

D.A. Lampasi, L. Podestà, P. Carbone
BINARY SEQUENCES FOR TEST SIGNAL GENERATION OBTAINED BY EVOLUTIONARY OPTIMIZATION

This paper describes a novel method for the digital synthesis of high quality signals by means of one-bit Digital-to-Analog Converters. The aim of the work is the analysis of the best binary sequences for signal generation, obtained using evolutionary algorithms.

Leopoldo Angrisani, Aldo Baccigalupi, Rosario Schiano Lo Moriello
NEW DSP-BASED ULTRASONIC DISTANCE/LEVEL METER

The paper describes a prototype of ultrasonic distance/level meter. The meter is based on a digital signal processor (DSP), mandated to supervise its whole functioning. Besides driving the piezoelectric transducer, the DSP manages the digitization of the received ultrasonic signal, processes the acquired samples, according to a suitable measurement algorithm, and delivers the desired result to the final user. The measurement algorithm, already presented and validated, grants functionalities typically provided by analog circuitry, with a consequent reduction of the impact of production tolerances of analog components on measurement accuracy.
Meter’s performance has been assessed through a number of laboratory tests involving known distances in different measurement conditions. A comparison of the experienced performance to that granted by other meters available on the market finally corroborate the reliability and efficacy of the proposed meter.

Grzegorz Lentka, Jerzy Hoja
THE INFLUENCE OF SAMPLING PARAMETERS ON ACCURACY OF CAPACITANCE MEASUREMENT IN THE METHOD BASED ON DSP

The paper presents the method of measurement of impedance parameters based on measurement signals sampling and DSP. The influence of main sources of uncertainty and errors on capacitance measurement accuracy has been analysed. The following have been included: non-synchronous sampling of two measurement signals proportional to current and voltage on impedance under measurement, A/D converter resolution and total number of collected samples. The results of simulations have been presented.

Slobodan Jankovic, Miodrag Ivkovic
DOMINANT NOISE SOURCES IDENTIFICATION AS COST-EFFECTIVE WAY IN TOTAL SOUND POWER REDUCTION

The paper deals with sound intensity measurement technique and its application in dominant sound sources identification as well as the reduction of total radiated sound power from a complex technical system.
Based on more restrictive regulation and other demands, mainly related to the environment protection, noise attenuation of technical systems has become common task for. Often the only solution is only system redesign. To enable cost effective approach to this demand the paper exposes a rational methodoloque. The SI mapping is used as framework for sound power integration across the independent subsystems, ranking their contribution to the total system noise level and finally, optimizing redesigning process based on expenses and expected noise attenuation.
Paper presents results achieved through the diesel engine noise attenuation.

A. Sabatini, A. Moschitta, P. Carbone
ΣΔ-BASED REMOVAL OF UNWANTED SPECTRAL COMPONENTS FOR SINEWAVE SYNTHESIS

This paper addresses the generation of spectrally pure sinewaves by combining the feedback structure of a ΣΔ loop with digital cancellation of unwanted spectral components in the output signal. In particular, the non-linearities of the in-loop Digital to Analog Converter (DAC) are compensated by applying a digital pre-distortion to the DAC input, and the feedback architecture is used to enhance the performance of the all digital estimation and cancellation algorithm.

G.Betta, D.Capriglione, C.Spataro, G.Tinè
SITE-TO-SITE REPRODUCIBILITY IN CONDUCTED IMMUNITY TESTS ON PC-BASED DATA ACQUISITION SYSTEMS

This paper deals with electromagnetic susceptibility of PC-based data acquisition systems (DASs) when subjected to electromagnetic disturbances considered in the EMC applicable standards. A suitable measurement procedure that allows the DAS susceptibility to be highlighted is proposed. Furthermore, a preliminary analysis of the measurement reproducibility is carried out with the aim of investigating some aspects that could affect the result reliability: the environmental and instrumentation features, the configuration set-up. To these aims, a number of tests are carried out by considering many data acquisition systems, different test set-up, and performing the experiments in two different sites. The connected results are compared and commented.

Zbigniew Czaja
TESTING METHOD OF ANALOG PARTS FOR MIXED SIGNAL MICROSYSTEMS BASED ON MICROCONTROLLERS

In the paper a new method of fault detection and location of a single soft fault in analog parts of mixed signal microsystems based on microcontrollers is presented. The idea of the method bases on the transformation which maps changes of the time response of the tested circuit on a square impulse resulting from changes of values of respective elements onto identification curves on a plane. The method consists of two stages. In the first stage a fault dictionary of an analog part in the form of a family of identification curves is generated and it is placed in the program memory of the microcontroller. In the second stage detection and a location of the fault are carried out.. This method does not require extra hardware in the microsystem. The measuring-diagnosis procedure is realised only by the microcontroller already existing in the microsystem.

Jan Chládek, Pavel Jurák, Josef Halámek, Igor Nestrašil, Robert Roman, Ivan Rektor
EVENT DIFFERENTIATION IN AVERAGED SIGNALS BY METHOD OF THE CREDITS

Presented Method of the Credits and its application are based on the determination of the statistically significant signal in the accumulated data. The method helps to determinate whether EEG signal is rather stimulus related than response related.

Page 791 of 977 Results 7901 - 7910 of 9762