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One or Two Frequencies? The Empirical Mode Decomposition Answers

G. Rilling, P. Flandrin
2008 IEEE Transactions on Signal Processing  
Essentially two regimes are shown to exist, depending on whether the amplitude ratio of the tones is greater or smaller than unity, and the corresponding resolution properties of EMD turn out to be in  ...  of a composite two-tones signal.  ...  ACKNOWLEDGMENT The authors would like to thank Paulo Gonçalvès (LIP-ENS Lyon) for many useful discussions.  ... 
doi:10.1109/tsp.2007.906771 fatcat:dhabfxjrvragxmeqmfeonb3mji

One or Two Components? The Scattering Transform Answers [article]

Vincent Lostanlen and Alice Cohen-Hadria and Juan Pablo Bello
2020 arXiv   pre-print
Thirdly, we generalize the "one or two components" framework to three sine waves or more, and prove that the effective scattering depth of a Fourier series grows in logarithmic proportion to its bandwidth  ...  Secondly, we run a manifold learning algorithm (Isomap) on scattering coefficients to visualize the similarity space underlying parametric additive synthesis.  ...  In this respect, we follow a well-established methodology in nonstationary signal processing, colloquially known as: "One or two frequencies?  ... 
arXiv:2003.01037v2 fatcat:mgdd3achqjepbaini54ti6ttf4

Adapting new capabilities or enhancing functionality? Two sequence patterns of capability redeem in platform ecosystems

Philipp Hukal, Alexander Eck
2016 International Conference on Information Systems  
In particular, we find evidence for two sequence patterns.  ...  -on platform ecosystems.  ...  The authors would like to thank two anonymous reviewers as well as the participants of the Pre-ICIS event '8 th International Workshop on Software Ecosystems' on December 10 th in Dublin, Ireland for their  ... 
dblp:conf/icis/HukalE16 fatcat:iwyewj5mpjerpe4rbg4yfm5evu

Analysis of Frequency Selective with Nonlinear Antenna under Radiations of Bi-Frequency Waves Based on Genetic Algorithm

Mona Teimoory
2016 INTERNATIONAL JOURNAL OF COMPUTERS & TECHNOLOGY  
Generally, the primitive population greatness has 30 or 100 members.  ...  It is worth to mention that two waves, with two different frequencies between 100 and 120 MHz, are radiated to antenna. The Ieq and Yin, in mentioned frequencies, are measured through FEKO software.  ...  Depending on the type of favorable electronic devices, the existing filters are categorized in three types: high-pass filter, low-pass filter, band-pass filter or composite.  ... 
doi:10.24297/ijct.v15i7.1549 fatcat:aj3g7stv4jeypi626kv3u7phky

Degeneracy, frequency response and filtering in IMRT optimization

Jorge Llacer, Nzhde Agazaryan, Timothy D Solberg, Claus Promberger
2004 Physics in Medicine and Biology  
This paper attempts to provide an answer to some questions that remain either poorly understood, or not well documented in the literature, on basic issues related to intensity modulated radiation therapy  ...  The questions examined are: the relationship between degeneracy and frequency response of optimizations, effects of initial beamlet fluence assignment and stopping point, what does filtering of an optimized  ...  Their use imposes some compromises on the quality of the treatment plans and it remains to be seen whether minor, but noticeable improvements on optimized plan quality translate into improvements on the  ... 
doi:10.1088/0031-9155/49/13/007 pmid:15285252 fatcat:c7shdixf3jez5b4pu2kviag67i

Discrete frequency warped wavelets: theory and applications

G. Evangelista, S. Cavaliere
1998 IEEE Transactions on Signal Processing  
The shape of the wavelets is not invariant by translation. Rather, the "wavelet translates" are obtained from one another by allpass filtering.  ...  We show that the discrete-time warped wavelets lead to well-defined continuous-time wavelet bases, satisfying a warped form of the two-scale equation.  ...  We will consider two special cases where the 's are either constant or are determined by the exponential cut-off choice .  ... 
doi:10.1109/78.668543 fatcat:ycrglf4hdjan3p4s63be3dkezi

Tampering identification using Empirical Frequency Response

Wei-Hong Chuang, Ashwin Swaminathan, Min Wu
2009 2009 IEEE International Conference on Acoustics, Speech and Signal Processing  
This paper focusses on tampering-type identification and introduces a new approach based on the Empirical Frequency Response (EFR) to address this problem.  ...  We then extend the approach to estimate the EFR for scenarios where only the final image is available.  ...  These works aim to just detect tampering and thus focus on answering whether the given image was tampered or not, and are not for identifying the type of tampering.  ... 
doi:10.1109/icassp.2009.4959884 dblp:conf/icassp/ChuangSW09 fatcat:rqmmelogdba3xgpp3ngojnlcbu

ADAPTIVE DATA ANALYSIS VIA SPARSE TIME-FREQUENCY REPRESENTATION

THOMAS Y. HOU, ZUOQIANG SHI
2011 Advances in Adaptive Data Analysis  
One advantage of performing such a decomposition is to preserve some intrinsic physical property of the signal, such as trend and instantaneous frequency.  ...  Because our method is based on a solid mathematical formulation, its performance does not depend on numerical parameters such as the number of shifting or stop criterion, which seem to have a major effect  ...  Huang and Zhaohua Wu for many stimulating discussions on EMD/EEMD and topics related to the research presented here.  ... 
doi:10.1142/s1793536911000647 fatcat:pjw67p6b6ra7xfmetl3us5j5wq

ON INSTANTANEOUS FREQUENCY

NORDEN E. HUANG, ZHAOHUA WU, STEVEN R. LONG, KENNETH C. ARNOLD, XIANYAO CHEN, KARIN BLANK
2009 Advances in Adaptive Data Analysis  
This paper offers an overview of the difficulties involved in using AS, and two new methods to overcome the difficulties for computing IF.  ...  Downloaded from www.worldscientific.com by 67.224.183.114 on 03/08/13. For personal use only. 178 N. E.  ...  A patent has been filed by NASA on the empirical AM-FM decomposition through spline fitted normalization scheme in computing the IF.  ... 
doi:10.1142/s1793536909000096 fatcat:j5zbo7ommnez7b3gpuotpvqz2a

Monitoring Screen Time or Redesigning It?

Mingrui Ray Zhang, Kai Lukoff, Raveena Rao, Amanda Baughan, Alexis Hiniker
2022 CHI Conference on Human Factors in Computing Systems  
To develop Chirp, we identifed 16 features that infuence users' sense of agency on Twitter through a survey of 129 participants and a design workshop.  ...  Existing designs helping people manage their social media use include: 1) external supports that monitor and limit use; 2) internal supports that change the interface itself.  ...  Any opinions, fndings, and conclusions or recommendations are those of the authors and do not necessarily refect the views of the National Science Foundation.  ... 
doi:10.1145/3491102.3517722 fatcat:tfs6zdybzvhqpfxn6dp6bgbb5u

Adaptive Multi-Trace Carving for Robust Frequency Tracking in Forensic Applications [article]

Qiang Zhu, Mingliang Chen, Chau-Wai Wong, Min Wu
2020 arXiv   pre-print
To address these issues, we propose Adaptive Multi-Trace Carving (AMTC), a unified approach for detecting and tracking one or more subtle frequency components under very low signal-to-noise ratio (SNR)  ...  AMTC takes as input a time-frequency representation of the system's preprocessing results (such as the spectrogram), and identifies frequency components through iterative dynamic programming and adaptive  ...  ACKNOWLEDGMENT The authors would like to thank the associate editor and anonymous reviewers whose comments and suggestions have helped improve the clarity and evaluations of this paper.  ... 
arXiv:2005.06686v2 fatcat:vxzkfcjw2bc7phoujtbbqqx52e

Multiparameter tuning of surface-acoustic-wave filters

R.W. Cohn, R.S. Wagers
1990 IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control  
nthe\iLe improved filter responses. Sensitivity measurement\. meawremenl accuracy and control of frequenc! response \idelolm are demonstrated for devices fabricated on ( M ) lithium niol~ate.  ...  for tuning the frequenc? response of sur~ce-acoustic-Har.c. (SAW') filter5 after initial fahrication is demonstrated.  ...  MULTIPARAMETER T U N I N G OF SAW FILTERS The Type-I filter (one unapodized and one apodized IDT) is compensated in two iterations of the compensation loop using the 16 perturbation measurements Learning  ... 
doi:10.1109/58.55316 pmid:18285039 fatcat:b7ywyqqn4facfjlxpvffntf6gu

A New Frequency Dependent Approach to Model Validation [chapter]

Pedro Balaguer, Ramon Vilanov
2009 Frontiers in Adaptive Control  
• No indication on how to improve the model on the next iteration (i.e. model order selection and/or input experiment design).  ...  Model Validation on Iterative Identification and Control Schemes The benefits of the frequency dependent model validation for the iterative identification and control schemes hinge on the frequency domain  ...  the original is properly cited and derivative works building on this content are distributed under the same license.  ... 
doi:10.5772/6423 fatcat:guc6m7va6zetpp7dynehzgb5hu

Frequency Domain Identification

T. McKelvey
2000 IFAC Proceedings Volumes  
For the finite data case the exact frequency domain expressions are derived relating the transfer function with the discret Fourier transformed data for both continuous and discrete time systems.  ...  It is shown how the discrete Fourier transform can be applied to generate frequency domain data from sampled time domain data.  ...  An important question to pose then is in which cases can it be advantageous to use the frequency domain method? The following points can shed some light on the answer.  ... 
doi:10.1016/s1474-6670(17)39719-7 fatcat:hn7po52ay5davemir5d75f45sm

Space-frequency quantization for wavelet image coding

Zixiang Xiong, K. Ramchandran, M.T. Orchard
1997 IEEE Transactions on Image Processing  
Despite the basic form of the two quantizers considered, the resulting algorithm demonstrates coding performance that is competitive, often outperforming the very best coding algorithms in the literature  ...  Recently, a new class of image coding algorithms coupling standard scalar quantization of frequency coefficients with tree-structured quantization (related to spatial structures) has attracted wide attention  ...  The predictability of subtrees depends on two thresholds output from the spatial quantizer.  ... 
doi:10.1109/83.568925 pmid:18282961 fatcat:a7lqra4qbvcjlhoyoj2id2f2uq
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