Wyniki wyszukiwania dla: SIGNAL DENOISING

• Fast High-Impedance Spectroscopy Method Using SINC Signal Excitation

  Publikacja

  • M. Kowalewski
  • G. Lentka

  - Metrology and Measurement Systems - Rok 2013

  In this paper the method of fast impedance spectroscopy of technical objects with high impedance (|Zx| > 1 Gohm) is evaluated by means of simulation and practical experiment. The method is based on excitation of an object with a sinc signal and sampling response signals proportional to current flowing through and voltage across the measured impedance. The object impedance spectrum is obtained with use of continuous Fourier transform...

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• Usage of the Gstreamer framework for generation, analysis, processing and visualization of sonar signal

  Publikacja

  • K. Czarnecki
  • D. Dąbrowski

  - HYDROACOUSTICS - Rok 2015

  In this paper a novel method of the bearing estimation in a passive sonar system with a towed array is introduced. The classical approach of the bearing estimation based on the spatial spectrum is extended by using the synchrosqeezing method that is a part of the reassignment method introduced by Kodera et al. The usage of this method leads to the precise bearing estimation. The proposed method requires a relatively small amount...

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• Separation of the effects of notch and macro residual stress on the MFL signal characteristics

  Publikacja

  • Z. Usarek
  • B. Augustyniak
  • M. Augustyniak

  - IEEE TRANSACTIONS ON MAGNETICS - Rok 2014

  Magnetic flux leakage (MFL) distribution for three configurations of samples has been investigated in order to study the influence of notch and plastic deformation separately as well as together. Samples have been made of S355 steel. The MFL signal measurements were carried out along the longest dimension of the sample over a length of 120 mm. Two components of magnetic field were measured: 1) tangential to the main axis and 2)...

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• A diagnosis method of analog parts of mixed-signal systems controlled by microcontrollers.

  Publikacja

  • Z. Czaja

  - MEASUREMENT - Rok 2006

  Przedstawiono nową klasę K-D metod diagnostyki analogowych części mieszanych sygnałowo mikrosystemów bazujących na mikrokontrolerach. Metody składają się z trzech etapów: etapu przedtestowego tworzenia słownika uszkodzeń, etapu pomiarowego bazujacego na pomiarach próbek napięcia odpowiedzi układu analogowego na pobudzenie impulsem prostokątnym wykonywanych przez wewnętrzne zasoby mikrokontrolera i z etapu detekcji i lokalizacji...

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• Simulation of electric hearing - influence of simulation parameters on quality of output signal

  Publikacja

  • A. Walkowiak
  • B. Kostek
  • A. Lorens
  • A. Czyżewski
  • A. Obrycka
  • A. Wąsowski

  - Rok 2006

  W środowisku programistycznym Matlab stworzono symulację słuchu elektrycznego pacjenta implantowanego. W symulacji zastosowano algorytm przetwarzania wykorzystywany w komercyjnych systemach implantów ślimakowych - CIS (Continuous Interleaved Sampling). W pracy zbadano wpływ ilości kanałów, jak i innych parametrów sygnałów wyjściowych przy zastosowaniu sygału mowy jako sygnału wejściowego symulacji.

• Guided waves in steel rails - experimental works and wavelet signal processing

  Publikacja

  • M. Rucka
  • K. Wilde

  - Key Engineering Materials - Rok 2007

  W artykule zaprezentowano analizę falkową pomierzonych eksperymentalnie fal sprężystych wzbudzanych w szynach kolejowych.

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• Time variable gain for long range sonar with chirp sounding signal

  Publikacja

  • J. Marszal
  • Z. Ostrowski
  • J. Schmidt
  • L. Kilian
  • A. Jedel
  • A. Schmidt

  - HYDROACOUSTICS - Rok 2007

  The main purpose of applaying Time Variable Gain (TVG) in active sonars with digital signal processing is to reduce dynamic range of echo signal and adapt it to the dynamic range of the analogue to digital conversion. With high transmission losses level, the dynamic range of the input signal in long range sonars can be very high and even exceed 200dB. When chirp sounding signals with matched filtration are used, sonars can raech...

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• Analysis of the torque response of a car engine to the step change of the control signal

  Publikacja

  • J. Kropiwnicki
  • M. Ziółkowski

  - Combustion Engines - Rok 2011

  W pracy zamieszczono wyniki badań silnika samochodu osobowego w warunkach nieustalonych. Stan obciążenia silnika wynikał z realizowanego cyklu jezdnego w warunkach drogowych oraz sposobu sterowania układem napędowym. Parametry trakcyjne pojazdu mierzone były za pomocą systemu GPS z fenomenologiczną korektą sygnału wysokości, na której się on znajdował. Wybrane parametry pracy silnika mierzone były za pomocą sytemu komunikującego...

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• Ground-based, Hyperbolic Radiolocation System with Spread Spectrum Signal - AEGIR

  Publikacja

  • S. J. Ambroziak
  • R. Katulski
  • J. Sadowski
  • W. Siwicki
  • J. Stefański

  - Rok 2011

  The most popular radiolocation systems in the world (at present), is the American GPS (Global Positioning System). It is managed by the Department of Defense and there is always the possibility of the occasional inaccuracies or deliberate introduction of errors that prevent its use by the special services or armies of other countries than the U.S.A. This situation has spawned the need to develop an autonomous, ground-based radiolocation...

• Self-optimizing narrowband interference canceller - can reference signal help?

  Publikacja

  • M. Niedźwiecki
  • M. Meller

  - Rok 2011

  SONIC (Self-Optimizing Narrowband Interference Canceller) is an acronym of the recently proposed active noise control algorithm with interesting adaptivity and robustness properties. SONIC is a purely feedback controller, capable of rejecting nonstationary sinusoidal disturbances (with time-varying amplitudes and/or frequencies) in the presence of plant (secondary path) uncertainties. We show that even though SONIC can work reliably...

• Narrowband Transmission Quality in Presence of Modified IEEE 802.15.4a UWB Signal

  Publikacja

  • J. Sadowski
  • R. Katulski

  - Rok 2011

  This paper presents results of measurement of narrowband transmission quality in presence of impulse radio UWB interference. In the first part of paper, unmodified IEEE 802.15.4a IR UWB signal is used. Then some modification of transmitted pulse sequence is proposed, which allow to reduce UWB power spectral density at frequency of narrowbandtransmission. Finally narrowband transmission quality in presence of modified ultrawideband...

• Implementation complexity analysis of the turbo decoding algorithms on digital signal processor

  Publikacja

  • O. Bisikalo
  • O. Stukach
  • R. Ignatovska
  • Z. Azeshova
  • R. Romaniuk
  • O. Romanyuk
  • Y. Ivanov
  • R. S. Romaniuk

  - Rok 2018

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• Guided Waves in Steel Rails – Experimental Works and Wavelet Signal Processing

  Publikacja

  • M. Rucka
  • K. Wilde

  - Rok 2007

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• Investigation of OSL signal of resistors from mobile phones for accidental dosimetry

  Publikacja

  • A. Mrozik
  • B. Marczewska
  • P. Bilski
  • W. Gieszczyk

  - RADIATION MEASUREMENTS - Rok 2014

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• A simulation investigation into the signal reconstruction accuracy of the transducer with pulse frequency output

  Publikacja

  • E. Pawlowski

  - Rok 2016

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• Method and system for disciplining a local reference oscillator by GPS 1PPS signal

  Publikacja

  • E. Pawłowski

  - Przegląd Elektrotechniczny - Rok 2018

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• A Modeling Problem of a Continuous-Time Domain Signal and Its Discrete Counterpart

  Publikacja

  • B. Szlachetko
  • Z. Swietach

  - Rok 2021

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• Accuracy improvement of short signal frequency estimation with the use of digital filtration

  Publikacja

  • E. Blok
  • M. Blok

  - Proceedings of SPIE - Rok 2006

  W pracy przedstawiono metodę estymacji częstotliwości krótkiej obserwacji zaszumionego sygnału sinusoidalnego. Podstawowy pomiar uzyskuje się za pomocą DFT. Jednak taki pomiar dla krótkich obserwacji cechuje bardzo mała dokładność. W omawianej metodzie pomiar ten jest poprawiany z użyciem specjalnie dobranego filtru cyfrowego. Jakość przedstawianej metody porównano z kilkoma innymi metodami również bazującymi na DFT.

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• Investigation on accelerated impedance spectrum measurement method with multisine signal stimulation

  Publikacja

  • M. Niedostatkiewicz
  • R. Zielonko

  - Metrology and Measurement Systems - Rok 2009

  The paper presents an investigation on the accelerated impedance spectrum measurement method, oriented at parameter identification of technical objects modelled by a linear equivalent circuit, e.g. anticorrosion coatings.The method is based on multisine signal stimulation of an object and response analysis by triangle window filterbanks.It has several advantages, as compared with conventional point-by-point spectrum measurement....

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• Narrowband Transmission Quality in Presence of Modified IEEE 802.15.4a UWB Signal

  Publikacja

  • J. Sadowski
  • R. Katulski

  - Rok 2010

  This paper presents results of measurement of narrowband transmission quality in presence of impulse radio UWB interference. In the first part of paper, unmodified IEEE 802.15.4a IR UWB signal is used. Then some modification of transmitted pulse sequence is proposed, which allow to reduce UWB power spectral density at frequency of narrowband transmission. Finally narrowband transmission quality in presence of modified ultrawideband...

• Narrowband Transmission Quality in Presence of Modified IEEE 802.15.4a UWB Signal

  Publikacja

  • J. Sadowski
  • R. Katulski

  - Przegląd Telekomunikacyjny + Wiadomości Telekomunikacyjne - Rok 2010

  Publikacja przedstawia opis stanowiska laboratoryjnego użytego do badania wpływu zakłóceń impulsowych na jakość odbioru sygnałów wąskopasmowych. Przedstawione zostały przykładowe wyniki pomiaru jakości transmisji wąskopasmowych wraz z wykazaniem, że modyfikacja widma zakłócającego sygnału IR UWB powoduje poprawę jakości odbioru sygnałów wąskopasmowych.

• Broadband LFM signal source for a module-based diver detection sonar

  Publikacja

  • K. Zachariasz
  • W. Lis
  • A. Elminowicz

  - HYDROACOUSTICS - Rok 2010

  Praca przedstawia koncepcję źródła impulsów sondujących sonaru DDS, dla pogrupowanych po stronie nadawczej elementarnych sekcji przetwornika w moduły 8 lub 16 elementowe. Na podstawie oszacowania teoretycznego i pomiarów czwórnikowych określono potrzebną moc wyjściową i topologię tych nadajników. Przedstawione są też uzyskane na drodze pomiarów charakterystyki częstotliwościowe modułów przetwornika, razem z zastosowanym układem...

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• Local dynamics of fluids and dielectrics as the foundation of signal-carrying wave properties

  Publikacja

  • H. Lasota

  - Rok 2014

  This paper develops an original approach to fundamental problems of classical linear acoustics and electromagnetics, proving a crucial role of doubly-dynamic local properties of a propagation medium in supporting wave-like fields able to carry information signals. The proof is composed of two steps concerning, subsequently, fluid acoustics and dielectric electromagnetics. The first step consists in complementing a common, practically...

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• Signal Propagation in Electromagnetic Media Modelled by the Two-Sided Fractional Derivative

  Publikacja

  • J. Gulgowski
  • D. Kwiatkowski
  • T. Stefański

  - Fractal and Fractional - Rok 2021

  In this paper, wave propagation is considered in a medium described by a fractional-order model, which is formulated with the use of the two-sided fractional derivative of Ortigueira and Machado. Although the relation of the derivative to causality is clearly specified in its definition, there is no obvious relation between causality of the derivative and causality of the transfer function induced by this derivative. Hence, causality...

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• QRS Morphology-Based EDR Signal—Factors Determining its Properties

  Publikacja

  • P. Przystup
  • A. Poliński
  • J. Wtorek

  - IEEE Access - Rok 2022

  Respiration-induced signals contain a clinically significant information. It could be obtained utilizing both direct and indirect methods. ECG-Derived Respiration (EDR) method is the latter one. However, in this case, two approaches could be distinguished. First one is based on determining changes in the morphology of QRS complexes while the second one is based on the Respiratory Sinus Arrhythmia (RSA) mechanism. The former approach...

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• Wideband Signal Generation for Jamming Radio-Controlled Improvised Explosive Devices

  Publikacja

  • J. Magiera

  - Rok 2018

  This paper focuses on modelling operation of a wideband jamming signal generator, considering the effects present in real device which influence the shape of transmitted signal’s spectrum. Introduction is followed by a brief overview of AEGIS project, aim of which is to develop a mobile generator of electromagnetic curtain. Next, simulation model is described which includes the factors...

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• Signal filtering method of the fast-varying diesel exhaust gas temperature

  Publikacja

  • P. Puzdrowska

  - Combustion Engines - Rok 2018

  The paper presents the problem of the impact of external distortions originating on laboratory test stands on the results of measurements of fast-varying diesel exhaust gas temperature. It has been stressed how significant the aspect of the test stand adaptation is during an experiment to ensure the smallest possible impact. This paper, however, focuses on the methods of mathematical processing of a signal recorded during experimental...

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• Estimation of the amplitude of the signal for the active optical gesture sensor with sparse detectors

  Publikacja

  • K. Czuszyński
  • J. Rumiński
  • A. Poliński
  • A. Bujnowski

  - Rok 2016

  In this paper we deal with the problem of precise gesture recognition for the active optical proximity sensor with sparse 8 photodiodes. We particularly focus on developing the method of estimating the real, usually not observable, maximum signal value representing maximum intensity of light reflected from an obstacle present in the front of the sensor. Different configurations of the fingers were used as an obstacle. The Monte Carlo...

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• Accuracy analysis of the RSSI BLE SensorTag signal for indoor localization purposes

  Publikacja

  • M. Kaczmarek
  • J. Rumiński
  • A. Bujnowski

  - Rok 2016

  In this paper we describe possibility of use the RSSI signal (Radio Signal Strength Indication) from Texas Instruments SensorTag CC2650 for indoor positioning purposes. This idea is not a new but in our opinion it is possible to use SensorTags with Bluetooth LE wireless interface for positioning inside buildings in such applications as people findings in hospitals, senior come care, etc. RSSI is mostly selected as the sensor localization...

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• Signal conditioning for examination of shallow-water acoustic noise correlation properties

  Publikacja

  • M. Rudnicki
  • J. Marszal

  - HYDROACOUSTICS - Rok 2016

  The article describes the process of signal conditioning for examination of acoustic noise correlation properties in shallow water. Knowledge of these properties is very important for the design processes of passive and active hydroacoustic systems. This paper focuses on the above issue from the point of view of passive sonar. In sonar systems, signal processing algorithms operate on both useful acoustic signals, and accompanying...

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• Probe signal processing for channel estimation in underwater acoustic communication system

  Publikacja

  • I. Kochańska
  • J. Schmidt

  - Rok 2017

  Underwater acoustic communication channels are characterized by a large variety of propagation conditions. Designing a reliable communication system requires knowledge of the transmission parameters of the channel, namely multipath delay spread, Doppler spread, coherence time, and coherence bandwidth. However, the possibilities of its estimation in a realtime underwater communication system are limited, mainly due to the computational...

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• Determining Pronunciation Differences in English Allophones Utilizing Audio Signal Parameterization

  Publikacja

  • B. Kostek
  • M. Piotrowska
  • T. Ciszewski
  • A. Czyżewski

  - Rok 2017

  An allophonic description of English plosive consonants, based on audio-visual recordings of 600 specially selected words, was developed. First, several speakers were recorded while reading words from a teleprompter. Then, every word was played back from the previously recorded sample read by a phonology expert and each examined speaker repeated a particular word trying to imitate correct pronunciation. The next step consisted...

• Signal Reconstruction from Sparse Measurements Using Compressive Sensing Technique

  Publikacja

  • B. Pałczyńska

  - Rok 2019

  The paper presents the possibility of applying a new class ofmathematical methods, known as Compressive Sensing (CS) for recovering thesignal from a small set of measured samples. CS allows the faithful recon-struction of the original signal back from fewer random measurements bymaking use of some non-linear reconstruction techniques. Since of all thesefeatures, CSfinds its applications especially in the areas where, sensing is...

• TIME- AND FREQUENCY-DOMAIN QUASI-2D SMALL-SIGNAL MOSFET MODELS

  Publikacja

  • W. Kordalski
  • T. Stefański
  • D. Trofimowicz

  - Rok 2019

  A novel approach to small-signal MOSFET modeling is presented in this book. As a result, time- and frequency-domain physics-based quasi-2D NQS four-terminal small-signal MOSFET models are proposed. The time-domain model provides the background to a novel DIBL-included quasi‑2D NQS four-terminal frequency-domain small-signal MOSFET model. Parameters and electrical quantities of the frequency-domain model are described by explicit...

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• Implementation of constant component filter in measurements of random telegraph signal noise

  Publikacja

  • A. Szewczyk
  • S. Babicz-Kiewlicz
  • A. Dudziak

  - Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej - Rok 2012

  Noise is generated in all semiconductor devices. The intensity of these fluctuations depends on used elements, manufacturing process, operating conditions and device type. The result noise is a superposition of different kinds of fluctuations like thermal noise, generation-recombination noise, 1/f noise, shot noise and Random Telegraph Signal (RTS) noise. The last one, RTS noise is observed as nonstationary impulse fluctuations....

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• Noise as stimulus signal for digital circuits noise immunity measurementand simulation

  Publikacja

  • L. Hasse
  • L. Spiralski
  • J. Piasecki

  - Rok 2003

  Wyniki pomiarów podatności na zakłócenia układów cyfrowych istotnie zależą od parametrów sygnału stymulujacego. Przedstawiono metodę pomiaru i symulacji dynamicznej odporności na zakłócenia z zastosowaniem sygnału szumu białego o różnej szerokości pasma częstotliwości. Modele symulacyjne dla sygnału pobudzającego (gaussowskiego szumu białego) zarówno szerokopasmowego jak i wąskopasmowego opracowano w środowisku programistycznym...

• Testing method of analog parts for mixed signal microsystems based on microcontrolles.

  Publikacja

  • Z. Czaja

  - Rok 2004

  Zaproponowano nową metodę detekcji i lokalizacji pojedynczych uszkodzeń parametrycznych, która może znaleźć zastosowanie do samo-testowania sieci analogowych w mikrosystemach mieszanych sygnałowo sterowanych mikrokontrolerami. Metoda ta jest oparta na przekształceniu transformującym próbki odpowiedzi czasowej na pobudzenie impulsem prostokątnym na krzywe identyfikacyjne na płaszczyźnie. Metoda pozwala na detekcję i lokalizację...

• Data Compression in Ultrasonic Network Communication via Sparse Signal Processing

  Publikacja

  • B. Zima
  • O. Reyes Márquez
  • M. Mohammadgholiha
  • J. Moll
  • L. Marchi De

  - Rok 2022

  This document presents the approach of using compressed sensing in signal encoding and information transferring within a guided wave sensor network, comprised of specially designed frequency steerable acoustic transducers (FSATs). Wave propagation in a damaged plate was simulated using commercial FEM-based software COMSOL. Guided waves were excited by means of FSATs, characterized by the special shape of its electrodes, and modeled...

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• EURASIP Journal on Advances in Signal Processing

  Czasopisma

  ISSN: 1687-6172 , eISSN: 1687-6180

• EURASIP JOURNAL ON APPLIED SIGNAL PROCESSING

  Czasopisma

  ISSN: 1110-8657

• APSIPA Transactions on Signal and Information Processing

  Czasopisma

  ISSN: 2048-7703

• Sampling Theory in Signal and Image Processing

  Czasopisma

  ISSN: 1530-6429

• Foundations in Signal Processing, Communications and Networking

  Czasopisma

  ISSN: 1863-8538 , eISSN: 1863-8546

• IEEE Open Journal of Signal Processing

  Czasopisma

  eISSN: 2644-1322

• Ewa Hermanowicz prof. dr hab. inż.

  Osoby

• Signal Partitioning Algorithm for Highly Efficient Gaussian Mixture Modeling in Mass Spectrometry

  Publikacja

  • A. Polanski
  • M. Marczyk
  • M. Pietrowska
  • P. Widlak
  • J. Polanska

  - PLOS ONE - Rok 2015

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• AM Modulation Signal Estimation Allowing Further Research on Sources of Voltage Fluctuations

  Publikacja

  • P. Kuwalek
  • P. Kuwałek

  - IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS - Rok 2020

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• Supply current signal and artificial neural networks in the induction motor bearings diagnostics

  Publikacja

  • T. Ciszewski
  • L. Swędrowski

  - Rok 2013

  This paper contains research results of the diagnostics of induction motor bearings based on measurement of the supply current with usage of artificial neural networks. Bearing failure amount is greater than 40% of all engine failures, which makes their damage-free operation crucial. Tests were performed on motors with intentionally made bearings defects. Chapter 2 introduces the concept of artificial neural networks. It presents...

• Pitch estimation of narrowband-filtered speech signal using instantaneous complex frequency

  Publikacja

  • T. Bandurski
  • Ł. Hamerski
  • M. Papaj
  • A. Paruzel
  • K. Świder

  - Rok 2007

  In this paper we propose a novel method of pitch estimation, based on instantaneous complex frequency (ICF). New iterative algorithm for analysis of ICF of speech signal in presented. Obtained results are compared with commonly used methods to prove its accuracy and connection between ICF and pitch, particularly for narrowband-filtered speech signal.

• Combined method of multibeam sonar signal processing and image analysis for seafloor classification

  Publikacja

  • A. Stepnowski
  • Z. Łubniewski

  - Rok 2011

  The combined approach to seafloor characterisation was investigated. It relies on calculation of several descriptors (parameters) related to seabed type using three types of multibeam sonar data obtained during seafloor sensing: 1) the grey-level sonar images (echograms) of seabed, 2) the 3D model of the seabed surface which consists of bathymetric data, 3) the set of time domain bottom echo envelopes received in the consecutive...