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Artykuły w czasopismach na temat „Comb filtering”

Autor: Grafiati

Data publikacji: 4 czerwca 2021

Data aktualizacji: 9 lutego 2022

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1

Horn, J., M. Jansen, and S. J. Prange. "Adaptive comb-filtering using neural networks." IEEE Transactions on Consumer Electronics 43, no. 3 (1997): 833–36. http://dx.doi.org/10.1109/30.628727.

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2

Nehorai, A., and B. Porat. "Adaptive comb filtering for harmonic signal enhancement." IEEE Transactions on Acoustics, Speech, and Signal Processing 34, no. 5 (October 1986): 1124–38. http://dx.doi.org/10.1109/tassp.1986.1164952.

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3

Ferreira, José L., Yan Wu, and Ronald M. Aarts. "Enhancement of the Comb Filtering Selectivity Using Iterative Moving Average for Periodic Waveform and Harmonic Elimination." Journal of Healthcare Engineering 2018 (2018): 1–14. http://dx.doi.org/10.1155/2018/7901502.

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A recurring problem regarding the use of conventional comb filter approaches for elimination of periodic waveforms is the degree of selectivity achieved by the filtering process. Some applications, such as the gradient artefact correction in EEG recordings during coregistered EEG-fMRI, require a highly selective comb filtering that provides effective attenuation in the stopbands and gain close to unity in the pass-bands. In this paper, we present a novel comb filtering implementation whereby the iterative filtering application of FIR moving average-based approaches is exploited in order to enh

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4

Hu, H. T. "Robust pitch estimation based on modified comb filtering approach." Electronics Letters 43, no. 25 (2007): 1471. http://dx.doi.org/10.1049/el:20071953.

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5

Wen Jin, Xin Liu, M. S. Scordilis, and Lu Han. "Speech Enhancement Using Harmonic Emphasis and Adaptive Comb Filtering." IEEE Transactions on Audio, Speech, and Language Processing 18, no. 2 (February 2010): 356–68. http://dx.doi.org/10.1109/tasl.2009.2028916.

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6

Ferreiro, T. I., T. P. Lamour, J. Sun, and D. T. Reid. "1.4 GHz femtosecond comb generation by Fabry‐Pérot filtering of optical parametric oscillator frequency comb." Electronics Letters 49, no. 13 (June 2013): 833–35. http://dx.doi.org/10.1049/el.2013.1504.

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7

Kitamura, Toshiaki. "Comb-Line Filter with Coupling Capacitor in Ground Plane." Active and Passive Electronic Components 2011 (2011): 1–6. http://dx.doi.org/10.1155/2011/919240.

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A comb-line filter with a coupling capacitor in the ground plane is proposed. The filter consists of two quarter-wavelength microstrip resonators. A coupling capacitor is inserted into the ground plane in order to build strong coupling locally along the resonators. The filtering characteristics are investigated through numerical simulations as well as experiments. Filtering characteristics that have attenuation poles at both sides of the passband are obtained. The input susceptances of even and odd modes and coupling coefficients are discussed. The filters using stepped impedance resonators (S

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8

Nishiyama, Akiko, Satoru Yoshida, Takuya Hariki, Yoshiaki Nakajima, and Kaoru Minoshima. "Sensitivity improvement of dual-comb spectroscopy using mode-filtering technique." Optics Express 25, no. 25 (December 6, 2017): 31730. http://dx.doi.org/10.1364/oe.25.031730.

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9

Šmíd, R., A. Hänsel, L. Pravdová, J. Sobota, O. Číp, and N. Bhattacharya. "Comb mode filtering silver mirror cavity for spectroscopic distance measurement." Review of Scientific Instruments 87, no. 9 (September 2016): 093107. http://dx.doi.org/10.1063/1.4962681.

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10

Hu, H. T. "Comb filtering of noisy speech using overlap-and-add approach." Electronics Letters 34, no. 1 (1998): 16. http://dx.doi.org/10.1049/el:19980107.

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11

Zhang, Heng, Jun Yao, Feng Gang Tao, and Xu Ye Zhuang. "MEMS Grating with Interdigitated-Comb Structure." Key Engineering Materials 503 (February 2012): 49–54. http://dx.doi.org/10.4028/www.scientific.net/kem.503.49.

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Grating as an important spectral component can be applied to spectral analysis, filtering, dispersion compensation, sensing and so on. Their advantages are compactness, potentially high actuation speed and the ability to deflect light at large angles. In this paper, a MEMS interdigitated-comb grating actuated by a comb-drive actuator is presented. An experiment is performed to demonstrate how the proposed grating works with an applied voltage. At 85V, the displacement of comb-drive actuator can achieve 2.1μm; accordingly the gap between the interdigitated-comb gratings varies by 2.1μm. The mec

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12

Wu, Rui, Minhyup Song, Daniel E. Leaird, and Andrew M. Weiner. "Comb-based radio-frequency photonic filtering with 20 ns bandwidth reconfiguration." Optics Letters 38, no. 15 (July 24, 2013): 2735. http://dx.doi.org/10.1364/ol.38.002735.

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13

Cramer, Claire E., Chih-Hao Li, Andrew J. Benedick, Alexander G. Glenday, Franz X. Kärtner, David F. Phillips, Dimitar Sasselov, Andrew Szentgyorgyi, and Ronald L. Walsworth. "Astro-comb: revolutionizing precision spectroscopy in astrophysics." Proceedings of the International Astronomical Union 4, S253 (May 2008): 499–501. http://dx.doi.org/10.1017/s174392130802704x.

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AbstractSearches for extrasolar planets using the periodic Doppler shift of stellar spectral lines have recently achieved a precision better than 60cm/s. To find a 1-Earth mass planet in an Earth-like orbit, a precision of 5cm/s is necessary. The combination of a laser frequency comb with a Fabry-Perot filtering cavity has been suggested as a promising approach to achieve such Doppler shift resolution via improved spectrograph wavelength calibration. Here we report the fabrication of such a filtered laser comb with up to 40 GHz (~1 Angstrom) line spacing, generated from a 1 GHz repetition-rate

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14

Pei, Jihong, Mi Zou, and Yang Zhao. "Adaptive comb-type filtering method for stripe noise removal in infrared images." Journal of Electronic Imaging 28, no. 01 (February 18, 2019): 1. http://dx.doi.org/10.1117/1.jei.28.1.013037.

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15

MK, Varun, Akhileshwar Mishra та Ravi Pant. "Slow-light based tunable delay and narrowband comb filtering at 2 μm". Optics Letters 44, № 21 (28 жовтня 2019): 5278. http://dx.doi.org/10.1364/ol.44.005278.

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16

Troncoso Romero, David Ernesto, Massimiliano Laddomada, and Gordana Jovanovic Dolecek. "Optimal Sharpening of Compensated Comb Decimation Filters: Analysis and Design." Scientific World Journal 2014 (2014): 1–9. http://dx.doi.org/10.1155/2014/950860.

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Comb filters are a class of low-complexity filters especially useful for multistage decimation processes. However, the magnitude response of comb filters presents a droop in the passband region and low stopband attenuation, which is undesirable in many applications. In this work, it is shown that, for stringent magnitude specifications, sharpening compensated comb filters requires a lower-degree sharpening polynomial compared to sharpening comb filters without compensation, resulting in a solution with lower computational complexity. Using a simple three-addition compensator and an optimizatio

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17

Rutkowski, Lucile, and Jérôme Morville. "Broadband cavity-enhanced molecular spectra from Vernier filtering of a complete frequency comb." Optics Letters 39, no. 23 (November 24, 2014): 6664. http://dx.doi.org/10.1364/ol.39.006664.

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18

Bao-Jian, Wu, Lu Xin, and Qiu Kun. "Magneto-Optic Fiber Gratings Useful for Dynamic Dispersion Management and Tunable Comb Filtering." Chinese Physics Letters 27, no. 6 (June 2010): 067803. http://dx.doi.org/10.1088/0256-307x/27/6/067803.

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19

Torres-Company, Victor, Daniel E. Leaird, and Andrew M. Weiner. "Simultaneous broadband microwave downconversion and programmable complex filtering by optical frequency comb shaping." Optics Letters 37, no. 19 (September 20, 2012): 3993. http://dx.doi.org/10.1364/ol.37.003993.

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20

Zhu, Dan Dan, and Hai Fang Wang. "The Application of Wavelet Denoise in Sampled Grating Comb Filter." Advanced Materials Research 1042 (October 2014): 135–38. http://dx.doi.org/10.4028/www.scientific.net/amr.1042.135.

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This paper based on the theoretical basis of sampled fiber grating, using transfer matrix method to analyze sampled fiber grating. By changing the parameters of sampled fiber grating and simulating its reflective spectrum. Four optical comb filters based on sampled grating were designed. Then the wavelet de-noising principle was introduced. In order to optimize designing of sampling grating comb filter, a filtering analysis and denoising method by using wavelet analysis to denoise was proposed. Finally, the automatic one-dimensional denoising was used with db6 wavelet. It not only denoise refl

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21

Siciliani de Cumis, Mario, Roberto Eramo, Jie Jiang, Martin E. Fermann, and Pablo Cancio Pastor. "Direct Comb Vernier Spectroscopy for Fractional Isotopic Ratio Determinations." Sensors 21, no. 17 (August 31, 2021): 5883. http://dx.doi.org/10.3390/s21175883.

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Accurate isotopic composition analysis of the greenhouse-gasses emitted in the atmosphere is an important step to mitigate global climate warnings. Optical frequency comb–based spectroscopic techniques have shown ideal performance to accomplish the simultaneous monitoring of the different isotope substituted species of such gases. The capabilities of one such technique, namely, direct comb Vernier spectroscopy, to determine the fractional isotopic ratio composition are discussed. This technique combines interferometric filtering of the comb source in a Fabry–Perot that contains the sample gas,

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22

Mildner, Jutta, Karl Meiners-Hagen, and Florian Pollinger. "Dual-frequency comb generation with differing GHz repetition rates by parallel Fabry–Perot cavity filtering of a single broadband frequency comb source." Measurement Science and Technology 27, no. 7 (May 31, 2016): 074011. http://dx.doi.org/10.1088/0957-0233/27/7/074011.

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23

Rutkowski, Lucile, and Jérôme Morville. "Continuous Vernier filtering of an optical frequency comb for broadband cavity-enhanced molecular spectroscopy." Journal of Quantitative Spectroscopy and Radiative Transfer 187 (January 2017): 204–14. http://dx.doi.org/10.1016/j.jqsrt.2016.09.021.

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24

McKinney, Jason D., Daniel E. Leaird, Alex S. Hastings, Andrew M. Weiner, and Keith J. Williams. "Optical Comb Sources and High-Resolution Optical Filtering for Measurement of Photodiode Harmonic Distortion." Journal of Lightwave Technology 28, no. 8 (April 2010): 1228–35. http://dx.doi.org/10.1109/jlt.2010.2044632.

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25

Jain, Sourabh, Sulabh Srivastava, Swati Rajput, Lalit Singh, Pragya Tiwari, Arvind K. Srivastava, and Mukesh Kumar. "Thermally Stable Optical Filtering Using Silicon-Based Comb-Like Asymmetric Grating for Sensing Applications." IEEE Sensors Journal 20, no. 7 (April 1, 2020): 3529–35. http://dx.doi.org/10.1109/jsen.2019.2960604.

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26

Nakajima, Yoshiaki, Takuya Hariki, Akiko Nishiyama, and Kaoru Minoshima. "Phase-stabilized all-fiber-based mode-filtering technique for generating a gigahertz frequency comb." Optics Express 28, no. 12 (May 27, 2020): 17502. http://dx.doi.org/10.1364/oe.393824.

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27

Li, Mengxian, Yiqing Shu, Lin Gu, Zhengwei Cui, Aiping Luo, Yongyao Li, and Weicheng Chen. "Modulated comb-like pulse distribution induced by intracavity Sagnac filtering in a fiber laser." Optics & Laser Technology 145 (January 2022): 107480. http://dx.doi.org/10.1016/j.optlastec.2021.107480.

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28

Xu Qin-Fang, Yin Mo-Juan, Kong De-Huan, Wang Ye-Bing, Lu Ben-Quan, Guo Yang, and Chang Hong. "Optical frequency comb active filtering and amplification for second cooling laser of strontium optical clock." Acta Physica Sinica 67, no. 8 (2018): 080601. http://dx.doi.org/10.7498/aps.67.20172733.

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29

Tsang, Peter W. M., Jung-Ping Liu, Hoson Lam, and Ting-Chung Poon. "Enhancing the Quality of Sampled Phase-Only Hologram (SPOH) Based on Time-Division Comb Filtering." Applied Sciences 10, no. 8 (April 15, 2020): 2732. http://dx.doi.org/10.3390/app10082732.

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Generation of digital phase-only Fresnel holograms is an important research area in digital holography, as it leads to a substantial simplification of a holographic display system. However, the quality of the reconstructed image of a hologram without the magnitude component is heavily degraded. The problem can be reduced by down-sampling the intensity of an image prior to generating the hologram. The method, referred to as “sampled phase-only hologram” (SPOH) generation, results in reconstructed images that are masked with the pattern of the down-sampling lattice. This paper reports a novel, l

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30

Wu, Rui, Christopher M. Long, Daniel E. Leaird, and Andrew M. Weiner. "Directly Generated Gaussian-Shaped Optical Frequency Comb for Microwave Photonic Filtering and Picosecond Pulse Generation." IEEE Photonics Technology Letters 24, no. 17 (September 2012): 1484–86. http://dx.doi.org/10.1109/lpt.2012.2205673.

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31

Zhang, Yun Dong, Jin Li, Han Yang Li, and Ping Yuan. "The Optical Response of Trapezoidal Comb-Like Nanostructures." Applied Mechanics and Materials 284-287 (January 2013): 2816–20. http://dx.doi.org/10.4028/www.scientific.net/amm.284-287.2816.

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Metal nanostructures can be used to control light transmission on the nanometer scale. In this paper, we propose a ladder-type comb-like metal nano-grating structure, based on optical filtering properties of the comb-like nanostructures and surface plasmon resonance effect of the metal nano-structures. The comb part of the structure is the silver nano-grating with the width of 20nm and a depth difference of 5nm between the adjacent gratings. We use the 532nm CW laser as the incident light source to study the reflective properties of the P polarized light and calculate the reflected power spect

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32

Santhanam, Balasubramaniam, and Petros Maragos. "Harmonic analysis and restoration of separation methods for periodic signal mixtures: Algebraic separation versus comb filtering." Signal Processing 69, no. 1 (August 1998): 81–91. http://dx.doi.org/10.1016/s0165-1684(98)00088-7.

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33

Nakajima, Yoshiaki, Akiko Nishiyama, and Kaoru Minoshima. "Mode-filtering technique based on all-fiber-based external cavity for fiber-based optical frequency comb." Optics Express 26, no. 4 (February 13, 2018): 4656. http://dx.doi.org/10.1364/oe.26.004656.

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34

Yang, Ruitao, Haisu Lv, Jing Luo, Pengcheng Hu, Hongxing Yang, Haijin Fu, and Jiubin Tan. "Ultrastable Offset-Locking Continuous Wave Laser to a Frequency Comb with a Compound Control Method for Precision Interferometry." Sensors 20, no. 5 (February 25, 2020): 1248. http://dx.doi.org/10.3390/s20051248.

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A simple and robust analog feedforward and digital feedback compound control system is presented to lock the frequency of a slave continuous wave (CW) laser to an optical frequency comb. The beat frequency between CW laser and the adjacent comb mode was fed to an acousto-optical frequency shifter (AOFS) to compensate the frequency dithering of the CW laser. A digital feedback loop was achieved to expand the operation bandwidth limitation of the AOFS by over an order of magnitude. The signal-to-noise ratio of the interference signal was optimized using a grating-based spectral filtering detecti

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35

Bai, Mingsian R., and Kwuen-Yieng Ou. "Synthesis of Room Responses Using the Virtual Source Representation and the Comb-Nested Allpass Filters." Journal of Vibration and Acoustics 128, no. 6 (October 9, 2005): 690–98. http://dx.doi.org/10.1115/1.2360951.

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An artificial reverberator is proposed in this paper to synthesize room responses. The method employs the virtual source representation and the comb-nested allpass filters to generate the early reflection and late reverberation, respectively, of room responses. The virtual source method is based on a simple representation of sound field with a distribution of discrete simple sources on the boundary. The complex strengths of the virtual sources are then calculated by solving a frequency domain least-square problem. Parameters such as room geometry, size, and wall absorption are naturally incorp

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36

Hou, Lei, Hai-Nian Han, Wei Wang, Long Zhang, Li-Hui Pang, De-Hua Li, and Zhi-Yi Wei. "A 23.75-GHz frequency comb with two low-finesse filtering cavities in series for high resolution spectroscopy." Chinese Physics B 24, no. 2 (February 2015): 024213. http://dx.doi.org/10.1088/1674-1056/24/2/024213.

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37

Caraquitena, José, and Javier Martí. "High-rate pulse-train generation by phase-only filtering of an electrooptic frequency comb: Analysis and optimization." Optics Communications 282, no. 18 (September 2009): 3686–92. http://dx.doi.org/10.1016/j.optcom.2009.06.017.

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38

Villa, Carlos, Michael Hayduk, and Eric Donkor. "Terahertz Optical Frequency Comb Generation by Spectral Filtering of Broadband Spontaneous Amplified Emissions From a Semiconductor Optical Amplifier." Journal of Lightwave Technology 27, no. 23 (December 2009): 5437–41. http://dx.doi.org/10.1109/jlt.2009.2026722.

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39

Ustinavičius, Tomas. "DIGITAL PROCESSING OF INVESTIGATED DAC’S SIGNALS." Mokslas - Lietuvos ateitis 2, no. 1 (February 28, 2010): 45–49. http://dx.doi.org/10.3846/mla.2010.010.

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The article shows that in designed algorithm for determination of digital signal processing and settling time of DAC the greatest influence on the test has 1/f type internal noise of the sampling converter. It is offered to filter the preliminary digital signal and to construct pseudo-periodic sequence from n realization periods of examined signals and internal noise. It is shown, that standard digital filters because of very high the demands are not suitable. The structure of digital comb filter is proposed. Investigations have shown that the given filter can effectively be used for filtering

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40

Liu, Jingfei, and Nico F. Declercq. "Pulsed ultrasonic comb filtering effect and its applications in the measurement of sound velocity and thickness of thin plates." Ultrasonics 75 (March 2017): 199–208. http://dx.doi.org/10.1016/j.ultras.2016.12.003.

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41

Schmeissner, Roman, Valerian Thiel, Clément Jacquard, Claude Fabre, and Nicolas Treps. "Analysis and filtering of phase noise in an optical frequency comb at the quantum limit to improve timing measurements." Optics Letters 39, no. 12 (June 11, 2014): 3603. http://dx.doi.org/10.1364/ol.39.003603.

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42

Condon, Marissa, and Brendan Hayes. "Control of limit cycles in buck converters." COMPEL: The International Journal for Computation and Mathematics in Electrical and Electronic Engineering 33, no. 4 (July 1, 2014): 1448–61. http://dx.doi.org/10.1108/compel-09-2013-0293.

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Purpose – The purpose of this paper is to investigate limit cycles in digitally Proportional, Integral and Derivative (PID) controlled buck regulators. Filtering is examined as a means of removing the limit cycles in digitally controlled buck regulators. Design/methodology/approach – The paper explains why limit cycles occur in a digitally PID controlled buck converter. It then proceeds to propose two filters for their elimination. Results indicate the effectiveness of each of the filters. Findings – The paper gives a mathematical analysis of the occurrence of limit cycles in digitally control

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43

Cao, Hui, Youjian Song, Yuepeng Li, Runmin Li, Haosen Shi, Jiahe Yu, Minglie Hu, and Chingyue Wang. "Reduction of Moving Target Time-of-Flight Measurement Uncertainty in Femtosecond Laser Ranging by Singular Spectrum Analysis Based Filtering." Applied Sciences 8, no. 9 (September 12, 2018): 1625. http://dx.doi.org/10.3390/app8091625.

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Femtosecond laser ranging has drawn great interest in recent years, particularly based on an asynchronous optical sampling implementation where a pair of femtosecond lasers are used. High precision absolute ranging either relies on tightly-phase-locked optical frequency combs (a dual-comb setup) or multiple averaging of the measurements from two free-running femtosecond lasers. The former technique is too complicated for practical applications, while the latter technique does not apply to moving targets. In this report, we propose a new route to utilizing a powerful singular spectrum analysis

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44

Silva, C. F. C., A. J. Seeds, and P. J. Williams. "Terahertz span >60-channel exact frequency dense WDM source using comb generation and SG-DBR injection-locked laser filtering." IEEE Photonics Technology Letters 13, no. 4 (April 2001): 370–72. http://dx.doi.org/10.1109/68.917856.

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45

Azam, S. M. Kayser, Muhammad I. Ibrahimy, S. M. A. Motakabber, A. K. M. Zakir Hossain, and Md Shazzadul Islam. "A miniaturized hairpin resonator for the high selectivity of WLAN bandwidth." Bulletin of Electrical Engineering and Informatics 8, no. 3 (September 1, 2019): 916–22. http://dx.doi.org/10.11591/eei.v8i3.1496.

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In this article, a miniaturized hairpin resonator has been presented to introduce the high selectivity of Wireless Local Area Network (WLAN) bandwidth. In the construction of the hairpin resonator, short-circuited comb-lines are electrically coupled with the two longer edges of a rectangular-shaped loop. The hairpin resonator has been designed and fabricated with the Taconic TLX-8 substrate with a center-frequency at 2.45 GHz. The resonator exhibits a second order quasi-Chebyshev bandpass response. A low insertion loss has been found as -0.36 dB with a minimum return loss as -36.71 dB. The fil

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46

Rämö, Jussi, and Vesa Välimäki. "Digital Augmented Reality Audio Headset." Journal of Electrical and Computer Engineering 2012 (2012): 1–13. http://dx.doi.org/10.1155/2012/457374.

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Augmented reality audio (ARA) combines virtual sound sources with the real sonic environment of the user. An ARA system can be realized with a headset containing binaural microphones. Ideally, the ARA headset should be acoustically transparent, that is, it should not cause audible modification to the surrounding sound. A practical implementation of an ARA mixer requires a low-latency headphone reproduction system with additional equalization to compensate for the attenuation and the modified ear canal resonances caused by the headphones. This paper proposes digital IIR filters to realize the r

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47

El kadmiri, Ilyass, Youssef Ben-Ali, Aissam Khaled, and Driss Bria. "Acoustic filtering and guiding by the presence of a defect at the opened resonators level’s in one-dimensional comb-like phononic structure." Materials Today: Proceedings 31 (2020): S33—S40. http://dx.doi.org/10.1016/j.matpr.2020.05.552.

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48

Liu, Zichen, Chao Li, Jin Tao, and Shaohua Yu. "Programmable High-Resolution Spectral Processor in C-band Enabled by Low-Cost Compact Light Paths." Photonics 7, no. 4 (December 7, 2020): 127. http://dx.doi.org/10.3390/photonics7040127.

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The flexible photonics spectral processor (PSP) is an indispensable element for elastic optical transmission networks that adopt wavelength division multiplexing (WDM) technology. The resolution and system cost are two vital metrics when developing a PSP. In this paper, a high-resolution 1 × 6 programmable PSP is investigated and experimentally demonstrated by using low-cost compact spatial light paths, which is enabled by a 2 K (1080p) liquid crystal on silicon (LCoS) and two cascaded transmission gratings with a 1000 line/mm resolution. For each wavelength channel, the filtering bandwidth an

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49

Mewada, Hiren K., and Jitendra Chaudhari. "Low computation digital down converter using polyphase IIR filter." Circuit World 45, no. 3 (August 5, 2019): 169–78. http://dx.doi.org/10.1108/cw-02-2019-0015.

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Purpose The digital down converter (DDC) is a principal component in modern communication systems. The DDC process traditionally entails quadrature down conversion, bandwidth reducing filters and commensurate sample rate reduction. To avoid group delay, distortion linear phase FIR filters are used in the DDC. The filter performance specifications related to deep stopband attenuation, small in-band ripple and narrow transition bandwidth lead to filters with a large number of coefficients. To reduce the computational workload of the filtering process, filtering is often performed as a two-stage

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Pack, A. I., D. A. Silage, R. P. Millman, H. Knight, E. T. Shore, and D. C. Chung. "Spectral analysis of ventilation in elderly subjects awake and asleep." Journal of Applied Physiology 64, no. 3 (March 1, 1988): 1257–67. http://dx.doi.org/10.1152/jappl.1988.64.3.1257.

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We studied the periodicities of ventilation in elderly subjects using digital comb filtering. Two groups of subjects were studied, those with and without sleep apnea. Measurements were made in wakefulness, stage 1-2 sleep, and where possible in stage 3-4 sleep. For each of the digital filters we calculated the average power of the oscillatory output. To compare subject groups we first specifically determined the average power in the filter with the maximum output. The mean of this measurement was greater in elderly subjects with apnea compared with those without apnea, both during wakefulness

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