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Journal articles on the topic 'Butterworth optical filter'

Author: Grafiati

Published: 5 June 2025

Last updated: 1 August 2025

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1

Subhashini, N., and A. Brintha Therese. "Performance Analysis of Different Electrical Filters in 10G Hybrid Passive Optical Network." International Journal of Engineering & Technology 7, no. 4 (2018): 6652. http://dx.doi.org/10.14419/ijet.v7i4.15758.

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With growing number of applications and network traffic, optic fibers are extensively used in the access part of the network. Passive Optical Networks (PON) in particular, Ethernet PON (EPON) networks based on Time Division Multiple Access (TDMA) are more prominently used in many parts of the world. Though Wavelength Division Multiplexing (WDM) PON has its own advantages, considering the cost and utilisation of such networks in the access part makes it less useful. On the other hand, Hybrid PON network combines the advantages of both EPON and WDM PON Networks. The objective of this paper is to

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Sharma, Priyanka, and Himali Sarangal. "Simulation and Analysis of Filters Using Different Photodiode and Wavelength in Free Space Optics." Asian Journal of Computer Science and Technology 5, no. 1 (2016): 25–29. http://dx.doi.org/10.51983/ajcst-2016.5.1.1760.

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Free space optics is a technology which uses beam of light to provide optical connection for transmitting and receiving purposes. For the increasing demand for high bandwidth in different network topology, FSO links has been a solution to the connectivity bottleneck problem. Transmitter consists of NRZ modulating CW laser with the link range 1 km in the wavelength 1310 nm or 1550 nm. When the signal is transmitted in the channel, the performance could be severely degrated due to atmospheric attenuation and earth inequalities. The purpose of this paper is to find a suitable filter for any of th

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3

Li, Yong-An. "Synthesis for Butterworth Filter Using Compact VDTA Based on Sallen- Key Topology." Recent Advances in Electrical & Electronic Engineering (Formerly Recent Patents on Electrical & Electronic Engineering) 13, no. 5 (2020): 681–88. http://dx.doi.org/10.2174/2352096512666191004123213.

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Background: The original filter including grounded or virtual ground capacitors can be synthesized by using the NAM expansion. However, so far the filters including floating capacitor, such as Sallen-Key filter, have not been synthesized by means of the NAM expansion. This is a problem to be researched further. Methods: By using the adjoint network theory, the Sallen-Key filter including floating capacitor first is turned into a current-mode one, which includes a grounded capacitor and a virtual ground capacitor. Then the node admittance matrix, after derived, is extended by using NAM expansio

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Cai, Xiao Dong, and Zhi Gang Liu. "Signal Processing Circuit Design and Application for Infrared Optical System Based on FPGA." Applied Mechanics and Materials 347-350 (August 2013): 1328–32. http://dx.doi.org/10.4028/www.scientific.net/amm.347-350.1328.

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The signal processing circuit based on FPGA was proposed in the paper, carrying out the function such as programmable signal amplification, adaptive filtering and so on. Among them, the programmable amplifier module was achieved with the programmable gain amplifier in series; Adaptive filter module was implemented with the Butterworth second-order active filter, to change the cutoff frequency of the filter by changing the potentiometer resistance. Experimental results show that the signal processing circuit was applied in the infrared optical system improving the signal to noise ratio of the i

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Belevitch, Vitold. "On filter pairs with butterworth characteristics." International Journal of Circuit Theory and Applications 15, no. 1 (1987): 51–60. http://dx.doi.org/10.1002/cta.4490150104.

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Teresa Sanz, M., Santiago Celma, and Belén Calvo. "Low-distortion 4th order programmable Butterworth filter." Microelectronics Reliability 47, no. 2-3 (2007): 471–76. http://dx.doi.org/10.1016/j.microrel.2006.05.008.

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Duro, Xhoena Polisi, Arban Uka, Griselda Alushllari, Albana Ndreu Halili, Dimitrios A. Karras, and Nihal Engin Vrana. "Optimizing combination of feature extraction and classifiers in supervised classification of cells images." Edelweiss Applied Science and Technology 9, no. 2 (2025): 682–707. https://doi.org/10.55214/25768484.v9i2.4570.

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Developments in the medical field have opened the opportunity to conduct analyses on a personalized patient level. One of the important analyses that can be conducted is the cellular response to engineered materials, and the most appropriate non-invasive methods are imaging. These images of the cells are unstained brightfield images, as they are acquired from multiparametric microfluidic chambers in the presence of biomaterials and fluids that can change the optical path length over time as the cells’ health state is monitored. These experimental conditions lead to an image dataset with unique

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Roy, S. C. Dutta. "Average time delay of an analogue butterworth filter." International Journal of Circuit Theory and Applications 14, no. 1 (1986): 79–82. http://dx.doi.org/10.1002/cta.4490140105.

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Golovastikov, Nikita V., Dmitry A. Bykov, Evgeni A. Bezus, and Leonid L. Doskolovich. "Lines of Quasi-BICs and Butterworth Line Shape in Stacked Resonant Gratings: Analytical Description." Photonics 10, no. 4 (2023): 363. http://dx.doi.org/10.3390/photonics10040363.

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We propose analytical approximations of the reflection and transmission spectra of a stacked dielectric diffraction grating consisting of two identical resonant guided-mode gratings with a Lorentzian line shape. These approximations, derived using the scattering matrix formalism, are functions of both angular frequency ω and the tangential wave vector component kx of the incident wave. We analytically demonstrate and, using full-wave simulations with rigorous coupled-wave analysis technique, numerically confirm that by a proper choice of the thickness of the dielectric layer separating the gra

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Trefilov, S. A., Yu R. Nikitin, and D. A. Ponomarev. "Study of Digital Discrete Fast High Order Bandpass Filter on TMS320F28377D Processor for Mobile Robot Navigation." Vestnik IzhGTU imeni M.T. Kalashnikova 27, no. 4 (2024): 55–69. https://doi.org/10.22213/2413-1172-2024-4-55-69.

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A digital discrete high-order fast bandpass filter on the TMS320F28377D processor for mobile robot navigation is developed and investigated. The application of the developed band-pass filter in beacon laser navigation systems is proposed in order to increase the speed of mobile robot coordinate computation when solving the fast convolution problem. A fast convolution algorithm based on a digital continuous band-pass Butterworth filter, which is optimal in terms of minimum computation time, is presented. The developed 22-order Butterworth filter is implemented on a digital signal processor TMS3

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Davis, Daniel J., and John H. Challis. "Vertical Ground Reaction Force Estimation From Benchmark Nonstationary Kinematic Data." Journal of Applied Biomechanics 37, no. 3 (2021): 272–76. http://dx.doi.org/10.1123/jab.2020-0237.

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Time-differentiating kinematic signals from optical motion capture amplifies the inherent noise content of those signals. Commonly, biomechanists address this problem by applying a Butterworth filter with the same cutoff frequency to all noisy displacement signals prior to differentiation. Nonstationary signals, those with time-varying frequency content, are widespread in biomechanics (eg, those containing an impact) and may necessitate a different filtering approach. A recently introduced signal filtering approach wherein signals are divided into sections based on their energy content and the

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Degtyarev, Andrey N., Igor L. Afonin, and Alexander L. Polyakov. "Physically realizable reconstruction of a continuous signal after sampling." Radioelectronics. Nanosystems. Information Technologies. 16, no. 1 (2024): 3–10. http://dx.doi.org/10.17725/j.rensit.2023.16.003.

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It is proposed to describe signals in a physically realizable basis. Correlation functions of impulse characteristics of physically implemented filters are used as basic functions. To obtain analytical expressions of the functions of the proposed physically realizable basis, it is proposed to use inverse Fourier transforms from approximations (Butterworth, Chebyshev, etc.) of the squares of the amplitude-frequency characteristics of normalized low-pass filters. The basis, functions are copies of the indicated correlation functions of the impulse characteristics, shifted relative to each other

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Mahata, Shibendu, Rajib Kar, and Durbadal Mandal. "Optimal approximation of asymmetric type fractional‐order bandpass Butterworth filter using decomposition technique." International Journal of Circuit Theory and Applications 48, no. 9 (2020): 1554–60. http://dx.doi.org/10.1002/cta.2835.

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Muhammad Daffa Khairi, Bedy Purnama, Imamura Kosuke, and Miki Abo. "Estimate the Region of Interest, Movement and Magnitude of Ciliary Beat with Dense Optical Flow." International Journal of Online and Biomedical Engineering (iJOE) 20, no. 11 (2024): 66–79. http://dx.doi.org/10.3991/ijoe.v20i11.48029.

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In this study, we analyze mucociliary transport (MCT) by measuring the magnitude and identifying regions of ciliary beats using high-frame-rate microscopic videos. Our methodology, integrating dense optical flow (DOF), connected component labeling (CCL), Butterworth filter, and Fast Fourier Transform (FFT), captures ciliary movement and magnitude. We focus on region extraction, quantification of ciliary activity, and classification of power and recovery strokes in ciliary beat frequency (CBF), which are crucial for evaluating MCT efficiency. Our approach was able to extract the ciliary region

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Shiu, Corwin, Ahmed Soliman, Roger O’Brient, et al. "Design and Performance of a 30/40 GHz Diplexed Focal Plane for the BICEP Array." Astrophysical Journal Supplement Series 272, no. 1 (2024): 12. http://dx.doi.org/10.3847/1538-4365/ad34d8.

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Abstract We demonstrate a wideband diplexed focal plane suitable for observing low-frequency foregrounds that are important for cosmic microwave background polarimetry. The antenna elements are composed of slotted bowtie antennas with 60% bandwidth that can be partitioned into two bands. Each pixel is composed of two interleaved 12 × 12 pairs of linearly polarized antenna elements forming a phased array, designed to synthesize a symmetric beam with no need for focusing optics. The signal from each antenna element is captured in-phase and uniformly weighted by a microstrip summing tree. The ant

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Eid, Mahmoud M. A., Abd El-Naser A. Mohammed, and Ahmed Nabih Zaki Rashed. "Different soliton pulse order effects on the fiber communication systems performance evaluation." Indonesian Journal of Electrical Engineering and Computer Science 23, no. 3 (2021): 1485–92. https://doi.org/10.11591/ijeecs.v23.i3.pp1485-1492.

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The study outlined the soliton pulse order effects on the performance efficiency of the optical transceiver systems. The power after fiber is reported for various Soliton pulse order. Max optical signal power (SP) and min optical noise power (NP) are clarified versus time after optical fiber for various soliton pulse order. As well as the max electrical power amplitude against time period is demonstrated after electrical filter for various soliton pulse order. It is reported that the optical transceiver performance efficiency can be upgraded with the first soliton order pulse. The soliton tech

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Ng, Zhan Heng, Connie Tee, Kan Yeep Choo, Michael Kah Ong Goh, Nurul Ain Abdul Aziz, and Hong Yeap Ngo. "Fiber Break Prevention Using Machine Learning Approaches." Journal of Informatics and Web Engineering 4, no. 1 (2025): 254–74. https://doi.org/10.33093/jiwe.2025.4.1.19.

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Modern fiber-optic communication systems are built around optical fiber, which allows data to be sent by emitting infrared light pulses. It is widely used by telecommunications firms and is essential to the smooth transmission of information in internet communication as well as the transmission of telephone signals. Nonetheless, optical fibers intrinsic fragility raises a problem, especially in areas where building projects are taking place. Especially nowadays construction-related impact and crushing pressures can cause physical damage that jeopardizes the fiber optic's integrity. Therefore,

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Chen, Xiangyu, та Yasuhiro Takahashi. "Floating Active Inductor Based Trans-Impedance Amplifier in 0.18 μm CMOS Technology for Optical Applications". Electronics 8, № 12 (2019): 1547. http://dx.doi.org/10.3390/electronics8121547.

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In this paper, a transimpedance amplifier (TIA) based on floating active inductors (FAI) is presented. Compared with conventional TIAs, the proposed TIA has the advantages of a wider bandwidth, lower power dissipation, and smaller chip area. The schematics and characteristics of the FAI circuit are explained. Moreover, the proposed TIA employs the combination of capacitive degeneration, the broadband matching network, and the regulated cascode input stage to enhance the bandwidth and gain. This turns the TIA design into a fifth-order low pass filter with Butterworth response. The TIA is implem

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Wang, Xiaoshuai, Binghong Chen, Ruimin Yang, Kai Liu, Kaixuan Cuan, and Mengbing Cao. "A Non-Contact and Fast Estimating Method for Respiration Rate of Cows Using Machine Vision." Agriculture 14, no. 1 (2023): 40. http://dx.doi.org/10.3390/agriculture14010040.

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Detecting respiration rate (RR) is a promising and practical heat stress diagnostic method for cows, with significant potential benefits for dairy operations in monitoring thermal conditions and managing cooling treatments. Currently, the optical flow method is widely employed for automatic video-based RR estimation. However, the optical flow-based approach for RR estimation can be time-consuming and susceptible to interference from various unrelated cow movements, such as rising, lying down, and body shaking. The aim of this study was to propose a novel optical flow-based algorithm for remote

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Liu, Ji-Chyun, Tai-Yi Wu, and Ching-Pin Kuei. "CPW-fed dual-mode double-ring resonators with Butterworth approximations for band-pass filter applications." Microwave and Optical Technology Letters 49, no. 5 (2007): 1217–21. http://dx.doi.org/10.1002/mop.22397.

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Ja, Y. H. "Design and characteristics of a periodic butterworth-like blocking filter using an s-shaped two-coupler optical fiber ring resonator." Microwave and Optical Technology Letters 7, no. 13 (1994): 613–16. http://dx.doi.org/10.1002/mop.4650071309.

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22

Sulistiyanto, Nanang. "Peningkatan Unjuk Kerja Sistem Sensor Garis Pemandu Pada Robot Kontes." Jurnal EECCIS (electrics, electronics, communications, controls, informatics, systems) 1, no. 1 (2016): 19. http://dx.doi.org/10.21776/jeeccis.v1i1.355.

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<p>Autonomous mobile robots competing during the Indonesian Domestic Robot Contest generally move by tracking a guidance line on the field based on information obtained from optical sensor systems. High intensity and non-homogenously distributed spotlights of television cameras have been the cause of most of the autonomous machines not to be able to move fast and accurately. As a solution, basic principles of Dual Tone Multi Frequency (DTMF) that has been successfully applied on telecommunication systems are adopted to increase the immunity of the sensor system from the disturbances. The

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LEE, Shuenn-Yuh, Cheng-Pin WANG, Chuan-Yu SUN, Po-Hao CHENG, and Yuan-Sun CHU. "Low-Power Fifth-Order Butterworth OTA-C Low-Pass Filter with an Impedance Scaler for Portable ECG Applications." IEICE Transactions on Electronics E101.C, no. 12 (2018): 942–52. http://dx.doi.org/10.1587/transele.e101.c.942.

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Tan, Mengying, Ning Zhou, Yao Cheng, Jiangwen Wang, Weihua Zhang, and Dong Zou. "A temperature-compensated fiber Bragg grating sensor system based on digital filtering for monitoring the pantograph–catenary contact force." Proceedings of the Institution of Mechanical Engineers, Part F: Journal of Rail and Rapid Transit 233, no. 2 (2018): 187–200. http://dx.doi.org/10.1177/0954409718786143.

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Optical sensors based on fiber Bragg gratings have become an important type of sensing element for strain measurements. In this study, fiber Bragg grating strain sensors and corresponding reference temperature sensors were integrated into a pantograph strip. The results of an online test indicated that the temperature of the pantograph strip impacting the strain measurement reaches about 80 ℃ while the vehicle was running. In addition, Fourier analysis showed that the energies of the temperature measurement signals dominated the relatively low-frequency band (less than 0.02 Hz), whereas the st

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Shoaib, Nosherwan, Imran Shoaib, and Sultan Shoaib. "A novel approach to transform an open circuit series stub to a short circuit shunt stub for the implementation of high-pass butterworth filter." Microwave and Optical Technology Letters 55, no. 3 (2013): 497–501. http://dx.doi.org/10.1002/mop.27354.

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Mahata, Shibendu, Norbert Herencsar, and David Kubanek. "Optimal Approximation of Fractional-Order Butterworth Filter Based on Weighted Sum of Classical Butterworth Filters." IEEE Access 9 (2021): 81097–114. http://dx.doi.org/10.1109/access.2021.3085515.

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Devaki, V., and T. Jayanthi. "SMARTPHONE-BASED DIAGNOSTIC MODEL FOR HYPERTENSION USING FEATURES FROM PHOTOPLETHYSMOGRAM." Biomedical Engineering: Applications, Basis and Communications 32, no. 04 (2020): 2050027. http://dx.doi.org/10.4015/s1016237220500271.

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Photoplethysmography (PPG) is an optical technique which measures blood volume changes in the arterial blood using red and IR LEDs of wavelengths 660[Formula: see text]nm and 940[Formula: see text]nm, respectively. This paper proposes a methodology to measure the pulse rate from the video signal obtained using an LETV-LE MAX 2 mobile phone’s camera and also to evaluate hypertension. The Android smartphone records the intensity of light reflected from the index finger. The recorded video is separated into red, green and blue frames. Since the red video frames returned useful plethysmographic in

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Rodrigues, Luis, Mónica Figueiredo, and Luis Nero Alves. "Optimized Analog Multi-Band Carrierless Amplitude and Phase Modulation for Visible Light Communication-Based Internet of Things Systems." Sensors 21, no. 7 (2021): 2537. http://dx.doi.org/10.3390/s21072537.

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This paper presents a multi-user Visible Light Communication (VLC)-based Internet of Things (IoT) system using multi band-Carrierless Amplitude and Phase (m-CAP) modulation for IoT applications. The proposed system uses a digital m-CAP modulator embedded in a ceiling LED light fixture and analog receivers, aiming at low-cost, low-power, and small-sized IoT devices. The performance was evaluated in terms of the filtering stage design and the usage of guard bands. Different pairs of emitter and receiver filters were considered. While Bessel and Butterworth analog filters were tested in the analo

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Lysechko, Volodymyr, and Vyacheslav Bershov. "Justification of Filter Selection Methods for Enhancing the Efficiency of Multilevel Recurrent Time-Frequency Segmentation." Security of Infocommunication Systems and Internet of Things 2, no. 1 (2024): 01006. http://dx.doi.org/10.31861/sisiot2024.1.01006.

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The article examines the issue of substantiation of filter selection methods to increase the efficiency of multi-level recurrent time-frequency segmentation in cognitive telecommunication systems. The main attention is paid to the analysis of signal filtering methods to improve the quality of data transmission in the dynamic conditions of the radio environment. The purpose of the article is to evaluate the effectiveness of various filtering methods for segmentation of ensembles of complex signals. The methods described in the article include Butterworth, Chebyshev, Bessel, Kaiser, elliptic, an

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Shan, Jerry W., Paisan Atsavapranee, Peter A. Chang, Wesley M. Wilson, and Stephan Verosto. "Characteristics of Fuel Droplets Discharged From a Compensated Fuel/Ballast Tank." Journal of Fluids Engineering 128, no. 5 (2006): 893–902. http://dx.doi.org/10.1115/1.2234780.

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Fuel droplets, formed by the interaction of fuel plumes with a water/fuel interface, can be discharged during the refueling of water-filled compensated fuel/ballast tanks. Motivated by increasingly stringent environmental regulations, a study was initiated to understand the physical mechanisms involved in the formation and transport of fuel droplets by complex immiscible flows inside a model tank. In particular, optical measurements were made of the size distribution of fuel droplets in water discharged from a three-bay model of a compensated fuel/ballast tank. The volumetric fuel concentratio

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Mahata, Shibendu, Rajib Kar та Durbadal Mandal. "Optimal Modelling of (1 + α) Order Butterworth Filter under the CFE Framework". Fractal and Fractional 4, № 4 (2020): 55. http://dx.doi.org/10.3390/fractalfract4040055.

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This paper presents the optimal rational approximation of (1+α) order Butterworth filter, where α ∊ (0,1) under the continued fraction expansion framework, by employing a new cost function. Two simple techniques based on the constrained optimization and the optimal pole-zero placements are proposed to model the magnitude-frequency response of the fractional-order lowpass Butterworth filter (FOLBF). The third-order FOLBF approximants achieve good agreement to the ideal characteristic for six decades of design bandwidth. Circuit realization using the current feedback operational amplifier is pre

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Kavita, Singh, Kumar Rajesh, and Narang Tulika. "Brain MRI Enhancement using Butterworth Filtering and Autoencoders." Advancement in Image Processing and Pattern Recognition 8, no. 3 (2025): 32–47. https://doi.org/10.5281/zenodo.15581751.

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<em>This paper focuses on the utilization of the Butterworth filter and autoencoders to enhance the quality and interpretability of MRI (Magnetic Resonance Imaging) images. It delves into the comparative analysis of two design techniques, Analog filter design and Pole Zero Placement method, to gauge the effectiveness of the Butterworth filter. Additionally, autoencoders are employed to further refine the images by learning optimal feature representations and reducing artifacts. The research relies on several quantitative evaluation metrics, such as Mean Squared Error (MSE), Peak Signal-to-Nois

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Bittendorf, Carl, Thorsten Stein, Stefan Sell, and Bernd J. Stetter. "Development of an IMU-based motion capture system for swimming: A study protocol." Current Issues in Sport Science (CISS) 9, no. 4 (2024): 015. http://dx.doi.org/10.36950/2024.4ciss015.

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Optical motion capture systems are the gold standard for collecting three-dimensional kinematic data in sports. However, while their use in flow channels is somewhat practical, they are difficult to employ in swimming pools, e.g. due to camera placement and the dynamic refraction of light and air bubbles. IMUs can circumvent these problems, but have so far primarily been used to calculate relatively condensed information such as distance per stroke or lap counts (Magalhaes et al., 2015). Additionally, current commercially available IMU-based systems for the collection of segment orientations a

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Shovon, S. K. F. Alam, Rafid Rizwan Sohan, Tanmay Deb Dhurba, Sajal Kumar Ghosh, Muhammad Johirul Islam, and M. Iqbal Bahar Chowdhury. "Proteus-Matlab Based Implementation and Filter Performance Analysis of an Analog Front-End Circuit for ECG Signal Processing." Journal of Advancement in Electronics Signal Processing 2, no. 2 (2025): 1–12. https://doi.org/10.46610/joaesp.2025.v02i02.001.

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This study describes the design and development of a front-end analog circuit for processing ECG signals, with signal analysis done in MATLAB® and preliminary simulations done with Proteus. An electrostatic discharge (ESD) protection module, an instrumental amplifier, and several filters intended to enhance the ECG signal are all part of the analog front-end circuit. The circuit uses both low-pass and high-pass filters to create a frequency range of 0.5 Hz to 100 Hz. It starts with an ESD safety stage and ends with an instrumental amplifier. The change from a 4th-order to a 6th-order Bessel fi

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Begon, Mickaël, and Patrick Lacouture. "Accuracy of 3-D Reconstruction with Occlusions." Journal of Applied Biomechanics 26, no. 1 (2010): 104–8. http://dx.doi.org/10.1123/jab.26.1.104.

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A marker has to be seen by at least two cameras for its three-dimensional (3-D) reconstruction, and the accuracy can be improved with more cameras. However, a change in the set of cameras used in the reconstruction can alter the kinematics. The purpose of this study was to quantify the harmful effect of occlusions on two-dimensional (2-D) images and to make recommendations about the signal processing. A reference kinematics data set was collected for a three degree-of-freedom linkage with three cameras of a commercial motion analysis system without any occlusion on the 2-D images. In the 2-D i

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Honda, Norinari, Kikuo Machida, Jirou Tsukada, Hiroyuki Kaizu, and Minoru Hosoba. "Optimal preprocessing Butterworth-Wiener filter for Tl-201 myocardial SPECT." European Journal of Nuclear Medicine 13, no. 8 (1987): 404–7. http://dx.doi.org/10.1007/bf00292492.

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Antara, Adi Surya, N. Gunantara, and NMAED Wirastuti. "Metode RF Filter untuk Perbaikan Kinerja Received Total Wideband Power pada Sistem UMTS." Majalah Ilmiah Teknologi Elektro 15, no. 1 (2016): 61. http://dx.doi.org/10.24843/mite.2016.v15i01p11.

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Cellular communication system with multiple network operators operate on a co-located area (heterogeneus network) causing effect of radio frequency interference. RTWP (received total wideband power) value emerges as indicator radio frequency interference on UMTS system, which is primary contribution of degraded QoS cellular communication system. RF filter butterworth circuit two half section resulted as optimal design to reach the goal compare to the other circuit section. By implemented RF filter has showed improvement indicator perform RTWP on UMTS network operator. DOI: 10.24843/MITE.1501.1

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Ünal, Zeynep. "Image preprocessing techniques applied on NIR images for fruit bruise detection." BIO Web of Conferences 85 (2024): 01028. http://dx.doi.org/10.1051/bioconf/20248501028.

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This study investigates the transformative potential of image preprocessing techniques when applied to near-infrared (NIR) images for early bruise detection. It emphasizes the nuanced selection of filters to retain essential image features while accentuating bruise characteristics. Filters as noise-reduction tools, rendering bruises more visible without erasing critical details. Subsequently, the limitations of conventional edge detection filters were examined such as Sobel, Prewitt, and Canny, which excel in outlining fruit edges but fall short in delineating bruises. Adaptive thresholding me

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Nilufar Niyozmatova, Kuanish Jalelov, Boymirzo Samijonov, and Mukhtaram Madrahimova. "Eliminating noise from a speech signal based on a pair of filters." International Journal of Science and Research Archive 13, no. 2 (2024): 401–10. http://dx.doi.org/10.30574/ijsra.2024.13.2.2058.

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Today, the increase in the number of devices working based on speech interfaces increases the importance of speech quality. However, even a minimal noise level can seriously affect the accuracy of speech signal recognition and processing. Therefore, denoising speech signals is an important task in signal processing, and it also serves to improve speech quality in telecommunications, speech recognition systems, and other speech-related applications. Applying existing noise reduction filters separately may not always be effective. Therefore, in this research, a noise reduction approach based on

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Lovchakov, V. I., та O. A. Shibyakin. "Modiﬁed Butterworth Filters in Solving the Inverse Problem of Analytical Design of Optimal Controllers". Mekhatronika, Avtomatizatsiya, Upravlenie 22, № 2 (2021): 71–82. http://dx.doi.org/10.17587/mau.22.71-82.

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In this work, for linear stationary one-dimensional control objects, the inverse problem of analytical design of optimal controllers (ADOC) is considered, which consists in determining the weight coefficients of the quadratic functional of the optimality of the control process that provide the closed-loop control system with the specified values of the time of transient processes and overshoot. The time of the transient process (regulation time) of the synthesized system is understood in the sense of the classical theory of automatic control and is determined using a " tube" , the value of whi

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Su, Te-Jen, Qian-Yi Zhuang, Wei-Hong Lin, Ya-Chung Hung, Wen-Rong Yang, and Shih-Ming Wang. "Design of Infinite Impulse Response Filters Based on Multi-Objective Particle Swarm Optimization." Signals 5, no. 3 (2024): 526–41. http://dx.doi.org/10.3390/signals5030029.

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The goal of this study is to explore the effectiveness of applying multi-objective particle swarm optimization (MOPSO) algorithms in the design of infinite impulse response (IIR) filters. Given the widespread application of IIR filters in digital signal processing, the precision of their design plays a significant role in the system’s performance. Traditional design methods often encounter the problem of local optima, which limits further enhancement of the filter’s performance. This research proposes a method based on multi-objective particle swarm optimization algorithms, aiming not just to

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Mecozzi, Antonio. "Soliton transmission control by Butterworth filters." Optics Letters 20, no. 18 (1995): 1859. http://dx.doi.org/10.1364/ol.20.001859.

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Mahata, Shibendu, Rajib Kar, and Durbadal Mandal. "Optimal fractional-order highpass Butterworth magnitude characteristics realization using current-mode filter." AEU - International Journal of Electronics and Communications 102 (April 2019): 78–89. http://dx.doi.org/10.1016/j.aeue.2019.02.014.

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Łukaniszyn, Marian, Michał Lewandowski, and Łukasz Majka. "Comparison of Optimal SASS (Sparsity-Assisted Signal Smoothing) and Linear Time-Invariant Filtering Techniques Dedicated to 200 MW Generating Unit Signal Denoising." Energies 17, no. 19 (2024): 4976. http://dx.doi.org/10.3390/en17194976.

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Performing reliable calculations of power system dynamics requires accurate models of generating units. To be able to determine the parameters of the models with the required precision, a well-defined testing procedure is used to record various unit transient signals. Unfortunately, the recorded signals usually contain discontinuities, which complicates the removal of the existing harmonic interferences and noise. A set of four transient signals recorded during typical disturbance tests of a 200 MW power-generating unit was used as both training and research material for the signal denoising/i

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Binh, L. N., N. X. Thien, and N. Q. Ngo. "Realisation of Butterworth-type optical filters using 3 × 3 coupler ring resonators." IEE Proceedings - Optoelectronics 143, no. 2 (1996): 126. http://dx.doi.org/10.1049/ip-opt:19960079.

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Mahata, Shibendu, Suman Kumar Saha, Rajib Kar, and Durbadal Mandal. "Optimal design of fractional order low pass Butterworth filter with accurate magnitude response." Digital Signal Processing 72 (January 2018): 96–114. http://dx.doi.org/10.1016/j.dsp.2017.10.001.

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Mahata, Shibendu, Rajib Kar, and Durbadal Mandal. "Optimal rational approximation of bandpass Butterworth filter with symmetric fractional-order roll-off." AEU - International Journal of Electronics and Communications 117 (April 2020): 153106. http://dx.doi.org/10.1016/j.aeue.2020.153106.

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Khatar, Zakaria, Dounia Bentaleb, and Saadia Drissi. "Bayesian Methods for Multi-Objective Optimization of Hybrid Numerical Filters in ECG Signal Processing for Accurate Arrhythmia Classification." Statistics, Optimization & Information Computing 13, no. 3 (2024): 993–1012. https://doi.org/10.19139/soic-2310-5070-2272.

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This study introduces an innovative method for ECG signal processing that combines advanced filtering techniques, multi-objective Bayesian optimization, and a sophisticated deep learning architecture for classification. The methodology starts with Enhanced Empirical Mode Decomposition (EEMD) to break down the ECG signal into Intrinsic Mode Functions (IMFs). These IMFs undergo filtration through a series of Chebyshev Type II, Butterworth, Daubechies Wavelet, and Savitzky-Golay filters. To achieve optimal performance, a Bayesian multi-objective optimization strategy, augmented by reinforcement l

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Kumngern, Montree, Nattharinee Aupithak, Fabian Khateb, and Tomasz Kulej. "0.5 V Fifth-Order Butterworth Low-Pass Filter Using Multiple-Input OTA for ECG Applications." Sensors 20, no. 24 (2020): 7343. http://dx.doi.org/10.3390/s20247343.

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This paper presents a 0.5 V fifth-order Butterworth low-pass filter based on multiple-input operational transconductance amplifiers (OTA). The filter is designed for electrocardiogram (ECG) acquisition systems and operates in the subthreshold region with nano-watt power consumption. The used multiple-input technique simplifies the overall structure of the OTA and reduces the number of active elements needed to realize the filter. The filter was designed and simulated in the Cadence environment using a 0.18 µm Complementary Metal Oxide Semiconductor (CMOS) process from Taiwan Semiconductor Manu

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Ja, Y. H. "Butterworth-like filters using a S-shaped two-coupler optical fiber ring resonator." Microwave and Optical Technology Letters 6, no. 6 (1993): 376–78. http://dx.doi.org/10.1002/mop.4650060612.

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