Temat: signal analysis - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Method for stabilogram characterization using angular-segment function
Autorzy:: Fiołka, J.
Kidoń, Z.
Powiązania:: https://bibliotekanauki.pl/articles/201643.pdf
Data publikacji:: 2013
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: posturography
biomedical signal analysis
signal processing
Opis:: This paper presents a new approach to descriptions of stabilograms. In the proposed method, a one-dimensional angular-segment function is generated from the stabilographic trajectory data. This allows to reduce the data dimensionality and makes the analysis easier. Moreover, three methods of angular-segment function parameterization are also presented in this study. The obtained results confirm the usefulness of the proposed parameters for medical diagnoses.
Źródło:: Bulletin of the Polish Academy of Sciences. Technical Sciences; 2013, 61, 2; 391-397
0239-7528
Pojawia się w:: Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: On Board Condition Monitoring of Feed Axes by Signal Decomposition for Machines with Ball Screw Drives
Autorzy:: Maier, D.
Sun, Z.
Powiązania:: https://bibliotekanauki.pl/articles/971168.pdf
Data publikacji:: 2009
Wydawca:: Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:: signal analysis
feed drive
wear
Opis:: In order to establish a condition monitoring system to detect wear of the mechanical components of feed drives with ball screws a measuring and data evaluation method has been established. In order to keep the costs down, boundary condition is to use the machines own functionalities only (On Board Diagnosis). At present, most of wear detecting methods use vibration analysis. Here, a signal analysis method is presented that may well complement established methods of vibration analysis. The publication presents a method to exploit positioning data to detect wear of a ball screw drive exemplarily that is run under real conditions. The presented method is partially derived from wear detection methods of roller bearings and may also be adapted for other parts such as linear guides.
Źródło:: Journal of Machine Engineering; 2009, 9, 3; 42-63
1895-7595
2391-8071
Pojawia się w:: Journal of Machine Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Prony’s method with reduced sampling - numerical aspects
Autorzy:: Zygarlicki, J.
Mroczka, J.
Powiązania:: https://bibliotekanauki.pl/articles/220676.pdf
Data publikacji:: 2014
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: signal analysis
harmonic analysis
signal processing
power quality
Opis:: This paper presents a new modification of the least-squares Prony’s method with reduced sampling, which allows for a significant reduction in the number of the analysed signal samples collected per unit time. The specific combination of non-uniform sampling with Prony’s method enables sampling of the analysed signals at virtually any average frequency, regardless of the Nyquist frequency, maintaining high accuracy in parameter estimation of sinusoidal signal components. This property allows using the method in measuring devices, such as for electric power quality testing equipped with low power signal processors, which in turn contributes to reducing complexity of these devices. This paper presents research on a method for selecting a sampling frequency and an analysis window length for the presented method, which provide maximum estimation accuracy for Prony’s model component parameters. This paper presents simulation tests performed in terms of the proposed method application for analysis of harmonics and interharmonics in electric power signals. Furthermore, the paper provides sensitivity analysis of the method, in terms of common interferences occurring in the actual measurement systems.
Źródło:: Metrology and Measurement Systems; 2014, 21, 3; 521-534
0860-8229
Pojawia się w:: Metrology and Measurement Systems
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Evaluating transmitters for quantifying respiratory airflow in the breathing mechanism
Autorzy:: Barański, Robert
Nitkiewicz, Szymon
Zając, Andrzej
Kukwa, Andrzej
Stano, Łukasz
Szawarc, Sebastian
Powiązania:: https://bibliotekanauki.pl/articles/27313802.pdf
Data publikacji:: 2024
Wydawca:: Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Tematy:: signal analysis
flow sensors
breathing
measurements
Opis:: Techniques for measuring fluid flow have been known since the 19th century. The first solutions based on the use of pressure only allowed relatively slow changes to be observed. It was not until measurement techniques based on the use of electronic components and the phenomenon of thermo-transfer, combined with a method enabling fast signal recording (A/C converters), that it became possible to analyse the flow of a medium (e.g. air) in detail. Although flow sensors based on measuring changes in resistance have been known for many years, new solutions are still being developed. This paper presents the results of a study using three sensors. Their response to laminar airflow was investigated for different velocities (1.2 - 2.6 m/s). The flow forcing was implemented using an axial fan and the signals were measured simultaneously for all the sensors tested. The results showed which sensors had the smallest dispersion of results (PAN and WA sensors) and confirmed that for the investigated velocity variations (0.14 m/s pitch) the results are unambiguously interpretable.. It should be noted that sensor research is related to the need to develop a device to measure flow as accurately as possible, while at the same time ensuring the comfort of the test person during the measurements. Therefore, the search was for a sensor that is small in size and at the same time resistant to damage and operation in a harsh humid environment.
Źródło:: Diagnostyka; 2024, 25, 1; art. no. 2024105
1641-6414
2449-5220
Pojawia się w:: Diagnostyka
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: A spectral-based method for tissue characterization
Autorzy:: Wójcik, J.
Byra, M.
Nowicki, A.
Powiązania:: https://bibliotekanauki.pl/articles/331796.pdf
Data publikacji:: 2016
Wydawca:: Polskie Towarzystwo Akustyczne
Tematy:: quantitative ultrasound
signal analysis
wave scattering
Opis:: Quantitative ultrasound methods are widely investigated as a promising tool for tissue characterization. In this paper, a novel quantitative method is developed which can be used to assess scattering properties of tissues. The proposed method is based on analysis of oscillations of the backscattered echo power spectrum. It is shown that these oscillations of the power spectrum are connected with the distances between scatterers within the medium. Two techniques are proposed to assess the scatterer’s distribution. First, we show that the inverse Fourier transform of the backscattered echo power spectrum corresponds to a histogram of the distances between scatterers. Second, the Hilbert-Huang transform is used to directly extract the power spectrum oscillations. Both methods are examined by means of a numerical experiment. A cellular gas model of a biological medium is considered. Results are presented and discussed. Both methods can be used to evaluate the scatterer’s distribution by means of the power spectrum oscillations.
Źródło:: Hydroacoustics; 2016, 19; 369-375
1642-1817
Pojawia się w:: Hydroacoustics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Computer-based speech analysis in stutter
Autorzy:: Szabelska, E.
Kruczyńska, A
Powiązania:: https://bibliotekanauki.pl/articles/117719.pdf
Data publikacji:: 2013
Wydawca:: Polskie Towarzystwo Promocji Wiedzy
Tematy:: speech therapy
stutter
logopaedics
signal analysis
Opis:: The paper presents computer aided approach to speech disorder analysis. The three levels definition of stutter is presented for describing this particular problem. The effective speech analysis algorithm used for segmentation of signal and detecting stutter is discussed and samples are presented.
Źródło:: Applied Computer Science; 2013, 9, 2; 34-42
1895-3735
Pojawia się w:: Applied Computer Science
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Employing Optical Measurements for Monitoring and Diagnostics of Combustion Process in Industrial Conditions
Autorzy:: Wójcik, W.
Suleimenov, B.
Junisbekov, M.
Kalizhanova, A.
Smailova, S.
Mussabekov, R.
Powiązania:: https://bibliotekanauki.pl/articles/124530.pdf
Data publikacji:: 2017
Wydawca:: Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:: combustion process
fiber optic probe
signal analysis
Opis:: The paper discusses some practical problems conected with introdction of modern coal combustion technologies as well as biomass co-combustion. In order to ensure that the combustion process runs in a proper way, the multichannel fiber optic monitoring system was applied. The system converts the optical signals coming from several flame zones to electrical that were further transmitted to the control room. The article prsents signal analyses made in time-frequency domain using short-time Fourier transform and wavelet transform and the way of their visualization to power boiler operators.
Źródło:: Journal of Ecological Engineering; 2017, 18, 1; 273-283
2299-8993
Pojawia się w:: Journal of Ecological Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Adaptive procedure for automatic modulation recognition
Autorzy:: Liedtke, F.
Powiązania:: https://bibliotekanauki.pl/articles/308334.pdf
Data publikacji:: 2004
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: modulation recognition
modulation classification
signal analysis
radio monitoring
Opis:: An adaptive procedure for automatic modulation recognition is described. With it the automatic modulation classification and recognition of radio communication signals with a priori unknown parameters is possible effectively. The results of modulation recognition are important in the context of radio monitoring or electronic support measurements. The special features of the procedure are the possibility to adapt it dynamically to nearly all modulation types, and the capability to recognize continuous phase modulation (CPM) signals like Gaussian minimum-shift keying (GMSK) too. A time synchronization to the symbol rate is not necessary.
Źródło:: Journal of Telecommunications and Information Technology; 2004, 4; 91-97
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Silent Calls – Causes and Measurements
Autorzy:: Baran, K.
Cegłowski, P.
Kula, S.
Powiązania:: https://bibliotekanauki.pl/articles/308612.pdf
Data publikacji:: 2015
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: key performance indicators
silent calls
speech signal analysis
Opis:: The quality of telephone services is very important from either operator or subscriber point of view. One of the negative phenomenon which affects quality of telephone services is lack of speech signal during a call. This situation occurs relatively frequently in mobile telephony, and is called silent call (SC). Lack of speech signal can occur only once or many times during the call, and degrade connection quality. In this paper, an analysis of this phenomenon is presented. The research base are the results of measurements mobile network one of operators in Trójmiasto a large urban area consisting of three cities: Gdańsk, Gdynia, and Sopot. To estimate impact of silent calls on speech quality, mean opinion score index was calculated using POLQA algorithm.
Źródło:: Journal of Telecommunications and Information Technology; 2015, 1; 20-22
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Event detection in ECG, carotid pulse, phonocardiogram, and detection of consecutive systolic time intervals
Autorzy:: Strasz, A.
Niewiadomski, W.
Skupińska, M.
Gąsiorowska, A.
Laskowska, D.
Leonarcik, R.
Cybulski, G.
Powiązania:: https://bibliotekanauki.pl/articles/384357.pdf
Data publikacji:: 2012
Wydawca:: Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:: systolic time intervals
ECG
polyphysiography
automatic signal analysis
Opis:: We developed a program which allows measurement of consecutive time intervals between chosen events in ECG, carotid pulse, and phonocardiogram. Currently it is possible to determine following systolic time intervals (STI): PEP - pre-ejection period, Q-S2 – time between trough of Q wave and aortic valve closure, Q-D - time between trough of Q wave and dicrotic notch, S2-D - time between aortic valve closure and dicrotic notch, as well as QQ interval. Measurements were performed on 30 young, healthy subjects. Subjects were supine, they performed two-minute isometric handgrip (HG) twice. First HG was followed by four-minute rest, second HG by two-minute occlusion of the working arm. Preliminary analyses revealed: 1/ the QQ interval changes were reflected weakly or not at all in changes of STI, 2/ shortening of QQ during handgrip was paralleled by slight decrease of Q-D and Q-S2, 3/ during occlusion, when QQ intervals returned to baseline also Q-D and Q-S2 returned to baseline, despite sustained elevation of arterial pressure, 4/ there were distinct oscillation in the time course of Q-S2 intervals, time course of Q-D intervals was relatively smooth, thus S2 and D may reflect different events contrary to common notation.
Źródło:: Journal of Automation Mobile Robotics and Intelligent Systems; 2012, 6, 3; 13-16
1897-8649
2080-2145
Pojawia się w:: Journal of Automation Mobile Robotics and Intelligent Systems
Dostawca treści:: Biblioteka Nauki

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