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Dither theory gives the condition of unbiasedness for non-subtractive dither, which can only be fulfilled with continuous-amplitude dithers. However, within a computer or a DSP, only digital dither can be used. A condition was given for digital dither, however, the condition and the proof was only approximate. This paper makes the statement precise, and gives a full proof for unbiasedness. Implementation...
High energies physics is nowadays challenging the unprecedented opportunity of studying and investigating the ultimate constituents of matter and their interaction. Thanks to its superior energy level, Large Hadron Collider (LHC), currently under construction at CERN (Geneva), will allow a deep insight into elementary particles world. To create and study elementary particles, it is, in fact, necessary...
Practically all measurement processes end up in making a decision, according to the result of a comparison between the measurement result and another given value, either a threshold or another measurement result. Moreover, in the recent years, thanks to the great diffusion of instruments based on digital signal processing, decisions are also required within the measurement process itself, and not...
Simple and efficient nonparametric spectral estimation is becoming more important as a signal processing tool in applied measurement science. A novel spectral analysis technique based on cepstrum thresholding is presented, which is shown to be an effective semi-automatic way of obtaining a smoothed nonparametric estimate of the spectrum of a stationary signal. The numerical study includes an example...
Depending on the types of engine failures, we attain some means to abstract the eigenvalues of signal in frequency field and time field, and design an intelligent analysis system based on TMS320VC5402. The particular hardware and software design based on the DSP device is present in the paper. The analysis system is high in speed, low in power consumption and small in size to be portable. It is fit...
An ultrasonic collision warning system suitable for embedding into a long cane for the sight impaired was designed. Using a sensor array and digital signal processing (DSP) techniques, an algorithm for collision hazard identification was formulated using a synthetic aperture to discriminate between echoes constituting real threats and those that do not. A prototype system was built using a Freescale...
This paper presents the advanced digital modifications of the conventional DC Anderson current loop circuit for impedance transducers as presented by Anderson (1998). The statistical DSP algorithms of current loop responses are applied for diminishing of measurement errors. The improved DC loop circuit used for absolute resistance measurement with high precision is offered. The experimental result...
Amplitude and phase measurements are important for balancing rotating machinery by means of signal analyzers. The most common methods use fast Fourier transform (FFT) algorithm to find the vibration spectrum and extract imbalance force parameters. A different solution is proposed here, based on the FFT but requiring less computational power. Additionally, the algorithms needed for implementation on...
This paper proposes a procedure aimed to measure very close tones in a wide frequency band. In many cases some tone can be hidden because of the inter-tone interference. The procedure is able to detect possibly hidden tones and to measure these interfering spectral components. The procedure is implemented on a wide bandwith digital scope resulting in an instrument capable to measure all the spectral...
The paper is focused on monitoring operations performed in power systems. The attention is paid to slow variations characterizing frequency and amplitude parameters of sinusoidal components. A suitable digital signal processing method aimed at estimating frequency and amplitude variations characterizing both the fundamental component as well as single harmonics and interharmonics contained in distorted...
In this paper, the system-level implementation of readout and control electronics for a microelectromechanical angular velocity sensor will be presented. The sensor element for which the electronics is designed is a bulk micromachined silicon device with electrostatic detection and excitation. The electronics is divided into two parts, analog and digital. Analog electronics is implemented with a 0...
Digital signal processing algorithms are nowadays playing a more and more important role in most measurement processes. Also in the presence of poor digitized data, reliable and repeatable results can often be assured by complementing the adopted measurement procedure with a suitable processing stage. The realization of a "collection" of measurement algorithms to be shared among researchers...
In this paper a four-electrode measurement cell is proposed for conductivity measurements. The main advantages of these cells include a wide measurement range and an intrinsic capability to minimize errors caused by fouling and polarization effects. The implemented prototype provides a flexible solution for data acquisition and signals processing and includes a capability to generate excitation signals...
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