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.
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.
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.
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...
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.
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...
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.
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...
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...
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.