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Proceedings of Third International Symposium on Time-Frequency and Time-Scale Analysis (TFTS-96)最新文献

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Real-time prototype for microcracks detection on ceramic materials 陶瓷材料微裂纹检测的实时原型
Proceedings of Third International Symposium on Time-Frequency and Time-Scale Analysis (TFTS-96) Pub Date : 1996-06-18 DOI: 10.1109/TFSA.1996.550094
M. Rodríguez, L. Vergara, J. Morales
{"title":"Real-time prototype for microcracks detection on ceramic materials","authors":"M. Rodríguez, L. Vergara, J. Morales","doi":"10.1109/TFSA.1996.550094","DOIUrl":"https://doi.org/10.1109/TFSA.1996.550094","url":null,"abstract":"The control of quality in industrial plants is an emerging field for signal processing applications. Among the numerous techniques utilised for detecting defects in materials are ultrasonics. We present a real-time prototype for the detection of microcracks in tiles of wet ceramic by means of ultrasonics. This non-destructive evaluation needs processing of the ultrasonic signals due to noise associated with these signals. The digital signal processing is based on the Wigner-Ville transform.","PeriodicalId":415923,"journal":{"name":"Proceedings of Third International Symposium on Time-Frequency and Time-Scale Analysis (TFTS-96)","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125652995","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 6
Adaptive local polynomial periodogram for time-varying frequency estimation 时变频率估计的自适应局部多项式周期图
Proceedings of Third International Symposium on Time-Frequency and Time-Scale Analysis (TFTS-96) Pub Date : 1996-06-18 DOI: 10.1109/TFSA.1996.547480
V. Katkovnik
{"title":"Adaptive local polynomial periodogram for time-varying frequency estimation","authors":"V. Katkovnik","doi":"10.1109/TFSA.1996.547480","DOIUrl":"https://doi.org/10.1109/TFSA.1996.547480","url":null,"abstract":"The local polynomial periodogram enables one to obtain nonparametric estimates of the instantaneous frequency (IF) and its derivatives. The optimal choice of the window size based on asymptotic formulas for the variance and bias can resolve the bias-variance trade-off usual for nonparametric estimation. However the practical value of such optimal estimator is not large because the optimal window size depends on the unknown smoothness of the IF. The main goal of this paper is to develop an adaptive estimator with a time-varying and data-driven window size which is able to provide a quality close to that which can be achieved if the smoothness of the IF is known in advance. The developed algorithm uses only the formulas for the variance of the estimates. Simulation shows a good tracking ability of the adaptive algorithm.","PeriodicalId":415923,"journal":{"name":"Proceedings of Third International Symposium on Time-Frequency and Time-Scale Analysis (TFTS-96)","volume":"120 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114520321","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 39
Time-frequency and time-scale analysis applied to soliton detection in the Caribbean sea 应用于加勒比海孤子探测的时频和时标分析
Proceedings of Third International Symposium on Time-Frequency and Time-Scale Analysis (TFTS-96) Pub Date : 1996-06-18 DOI: 10.1109/TFSA.1996.547486
M. Teixeira, J. Capella
{"title":"Time-frequency and time-scale analysis applied to soliton detection in the Caribbean sea","authors":"M. Teixeira, J. Capella","doi":"10.1109/TFSA.1996.547486","DOIUrl":"https://doi.org/10.1109/TFSA.1996.547486","url":null,"abstract":"Time-frequency and time-scale analysis methods are used to detect solitons, south of Puerto Rico, in the Caribbean Sea. A string of underwater sensors, deployed at particular depths, produced various temperature time series currently being analyzed for soliton detection. Different causes, such as a non-optimal placement of the sensor array in time or space, could yield a weak soliton signature deeply buried within the signal. Underwater sensor deployment is expensive, thus, the analysis methods were calibrated by incorporating a synthetic soliton into the original signal. Its parameters, such as peak amplitude, peak to peak distance and number of peaks, among others, were varied in order to \"ground truth\" the analysis results. The short time Fourier transform (STFT) and wavelet transform (WT) were used to analyze the data. The combined assessment of results, obtained through different methods, were used to pinpoint possible solitons in the time domain.","PeriodicalId":415923,"journal":{"name":"Proceedings of Third International Symposium on Time-Frequency and Time-Scale Analysis (TFTS-96)","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124054726","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A method for time-frequency multirate filtering 一种时频多速率滤波方法
Proceedings of Third International Symposium on Time-Frequency and Time-Scale Analysis (TFTS-96) Pub Date : 1996-06-18 DOI: 10.1109/TFSA.1996.546680
S. Wada, N. Takahashi
{"title":"A method for time-frequency multirate filtering","authors":"S. Wada, N. Takahashi","doi":"10.1109/TFSA.1996.546680","DOIUrl":"https://doi.org/10.1109/TFSA.1996.546680","url":null,"abstract":"A method for time-frequency multirate filtering of discrete-time signals is proposed. An input signal is nonuniformly decomposed into a number of subsignals, and the signals may be modified and combined on a specified time-frequency plane in real time processing. The modification process implies adaptive signal enhancement, filtering, movement and exchange over the time-frequency plane. The multirate filter is constructed based on parallel analysis and synthesis filter bank structures, and time-varying filtering may be achieved. By introducing a time-frequency plane and bifrequency maps, we formulate the multirate filters design completely. Design examples and experimental simulations are included.","PeriodicalId":415923,"journal":{"name":"Proceedings of Third International Symposium on Time-Frequency and Time-Scale Analysis (TFTS-96)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129456219","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Time-frequency formulation and design of optimal detectors 最佳探测器时频公式及设计
Proceedings of Third International Symposium on Time-Frequency and Time-Scale Analysis (TFTS-96) Pub Date : 1996-06-18 DOI: 10.1109/TFSA.1996.547219
G. Matz, F. Hlawatsch
{"title":"Time-frequency formulation and design of optimal detectors","authors":"G. Matz, F. Hlawatsch","doi":"10.1109/TFSA.1996.547219","DOIUrl":"https://doi.org/10.1109/TFSA.1996.547219","url":null,"abstract":"We present time-frequency (TF) formulations of optimal detectors for various nonstationary detection scenarios involving underspread processes. These TF formulations yield a better understanding of optimal detectors and simple TF design procedures.","PeriodicalId":415923,"journal":{"name":"Proceedings of Third International Symposium on Time-Frequency and Time-Scale Analysis (TFTS-96)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125399968","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 25
Classification using feature extraction based on time-frequency analysis and BCM theory 基于时频分析和BCM理论的特征提取分类
Proceedings of Third International Symposium on Time-Frequency and Time-Scale Analysis (TFTS-96) Pub Date : 1996-06-18 DOI: 10.1109/TFSA.1996.547456
Q. Huynh
{"title":"Classification using feature extraction based on time-frequency analysis and BCM theory","authors":"Q. Huynh","doi":"10.1109/TFSA.1996.547456","DOIUrl":"https://doi.org/10.1109/TFSA.1996.547456","url":null,"abstract":"Marine mammal sounds classification is demonstrated using a novel application of wavelet time/frequency decomposition, and feature extraction using the BCM neuron. The system achieves outstanding classification performance even when tested with mammal sounds recorded at very different locations (from training).","PeriodicalId":415923,"journal":{"name":"Proceedings of Third International Symposium on Time-Frequency and Time-Scale Analysis (TFTS-96)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129146138","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Applications of nonmaximally decimated multirate filterbanks in partial response channel ISI cancellation 非最大抽取多速率滤波器组在部分响应信道ISI消除中的应用
Proceedings of Third International Symposium on Time-Frequency and Time-Scale Analysis (TFTS-96) Pub Date : 1996-06-18 DOI: 10.1109/TFSA.1996.546687
X. Xia
{"title":"Applications of nonmaximally decimated multirate filterbanks in partial response channel ISI cancellation","authors":"X. Xia","doi":"10.1109/TFSA.1996.546687","DOIUrl":"https://doi.org/10.1109/TFSA.1996.546687","url":null,"abstract":"We study applications of nonmaximally decimated multirate filterbanks (NMDMF) in partial response channels, where the partial response transfer functions may not have inverses, such as frequency-selective fading channels. The NMDMF plays the preprocessing (or precoding) role. We present a necessary and sufficient condition on an FIR channel transfer function in terms of its zero set such that an FIR NMDMF with N channels and decimation by K, 0<K<N, for the encoder exists so that the decoder is able to recover the original signal with an FIR synthesis system, where the integers K and N are arbitrarily fixed. The condition is easy to check and satisfy. In addition to the conditions on the channel transfer functions, the practical design of the FIR NMDMF precoders and their FIR synthesis banks for the reconstruction is also given. An numerical example is presented to illustrate the theory.","PeriodicalId":415923,"journal":{"name":"Proceedings of Third International Symposium on Time-Frequency and Time-Scale Analysis (TFTS-96)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126390489","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 10
The exponential class and generalized time-shift covariant quadratic time-frequency representations 指数类和广义时移协变二次时频表示
Proceedings of Third International Symposium on Time-Frequency and Time-Scale Analysis (TFTS-96) Pub Date : 1996-06-18 DOI: 10.1109/TFSA.1996.550084
A. Papanreou-Suppappola, G. Boudreaux-Bartels
{"title":"The exponential class and generalized time-shift covariant quadratic time-frequency representations","authors":"A. Papanreou-Suppappola, G. Boudreaux-Bartels","doi":"10.1109/TFSA.1996.550084","DOIUrl":"https://doi.org/10.1109/TFSA.1996.550084","url":null,"abstract":"We propose the new exponential class of quadratic time-frequency representations (QTFRs) covariant to constant shifts in frequency and dispersive, exponential shifts in time. We obtain the exponential class from the two covariance properties it satisfies, and also by warping the affine class of scale and constant time-shift covariant QTFRs. We develop the class formulation, kernel constraints for desirable properties, new QTFR members, and the intersection of the exponential class with Cohen's class. We also propose QTFR classes that are covariant to generalized time-shifts according to arbitrary group delay functions. We obtain these classes from known QTFR classes (such as Cohen's class, the affine class, the hyperbolic class, and the power classes) using a generalized transformation based on the desirable group delay time-shift covariance.","PeriodicalId":415923,"journal":{"name":"Proceedings of Third International Symposium on Time-Frequency and Time-Scale Analysis (TFTS-96)","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126434206","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 17
Orthogonal wavelets and stochastic gradient-based algorithms 正交小波与随机梯度算法
Proceedings of Third International Symposium on Time-Frequency and Time-Scale Analysis (TFTS-96) Pub Date : 1996-06-18 DOI: 10.1109/TFSA.1996.550078
S. Attallah, M. Najim
{"title":"Orthogonal wavelets and stochastic gradient-based algorithms","authors":"S. Attallah, M. Najim","doi":"10.1109/TFSA.1996.550078","DOIUrl":"https://doi.org/10.1109/TFSA.1996.550078","url":null,"abstract":"Orthogonal wavelets have been used successfully to improve the convergence of the least mean squares (LMS) algorithm. This gave rise to the wavelet transform-domain LMS algorithm (WTDLMS). In this paper a fast version of this algorithm is presented. This algorithm is then applied to the problem of adaptive channel equalization.","PeriodicalId":415923,"journal":{"name":"Proceedings of Third International Symposium on Time-Frequency and Time-Scale Analysis (TFTS-96)","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126541286","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Pseudo-periodic 1/f-like noise 伪周期1/f样噪声
Proceedings of Third International Symposium on Time-Frequency and Time-Scale Analysis (TFTS-96) Pub Date : 1996-06-18 DOI: 10.1109/TFSA.1996.546701
G. Evangelista
{"title":"Pseudo-periodic 1/f-like noise","authors":"G. Evangelista","doi":"10.1109/TFSA.1996.546701","DOIUrl":"https://doi.org/10.1109/TFSA.1996.546701","url":null,"abstract":"This paper presents a new model for the synthesis of pseudo-periodic signals, based on self-similar noise processes that can be generated by computing the inverse multiplexed wavelet transform (MWT) of seed and characteristic sequences. These processes, which exhibit an approximate 1/f behavior near the harmonics of the fundamental frequency, are shown to be samples of a self-similar random field. They provide an extension of the Wornell-Oppenheim (1992) class of dy-homogeneous signals. Applications to speech and music are pointed out, where the defined processes may be used as excitation signals in order to approximate the fine structure of the frequency spectrum typical of voiced sounds.","PeriodicalId":415923,"journal":{"name":"Proceedings of Third International Symposium on Time-Frequency and Time-Scale Analysis (TFTS-96)","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126744669","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
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