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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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A low delay sub-band audio coder (20 Hz-15 kHz) at 64 kbit/s 低延迟子带音频编码器(20hz - 15khz)，速度为64kbit /s
Proceedings of Third International Symposium on Time-Frequency and Time-Scale Analysis (TFTS-96) Pub Date : 1996-06-18 DOI: 10.1109/TFSA.1996.547464
K. Hay, L. Mainard, S. Saoudi
{"title":"A low delay sub-band audio coder (20 Hz-15 kHz) at 64 kbit/s","authors":"K. Hay, L. Mainard, S. Saoudi","doi":"10.1109/TFSA.1996.547464","DOIUrl":"https://doi.org/10.1109/TFSA.1996.547464","url":null,"abstract":"a new method for coding generic audio signals at 64 kbit/s in the bandwidth 20-15000 Hz with a low delay is presented. It combines sub-band coding, low delay CELP algorithm and cascaded filterbanks. We show how the different parameters of LD-CELP can be adapted to achieve a better quality, perceptual coding techniques are integrated into the encoder for allocating bits to each sub-band.","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":"128575752","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: 3
Multiscale merging by a mixed approach for edge detection 一种混合多尺度融合边缘检测方法
Proceedings of Third International Symposium on Time-Frequency and Time-Scale Analysis (TFTS-96) Pub Date : 1996-06-18 DOI: 10.1109/TFSA.1996.546677
O. Laligant, F. Truchetet, L. Yan Voon
{"title":"Multiscale merging by a mixed approach for edge detection","authors":"O. Laligant, F. Truchetet, L. Yan Voon","doi":"10.1109/TFSA.1996.546677","DOIUrl":"https://doi.org/10.1109/TFSA.1996.546677","url":null,"abstract":"We present an edge detection algorithm from a multiscale analysis, for the real images with which we are confronted in our laboratory. These images are often 3D and because of the fields of depth of the lenses, the edges to be detected are blur. Our work is based on a generalization of the Canny-Deriche (1986, 1987) filter, modelized by a more realistic edge than the traditional ramp shape edge. This filter is used to generate a frame of wavelets. We propose a new criterium which allows to choose in a deterministic way the intrinsic parameters of the filters. This criterium introduces the concept of detection resolution which is a new concept in edge detection. For the merging of the data from the projection we use a new method which is based on a scanning of the scales in both directions: coarse-to-fine and fine-to-coarse, in order to ensure the best tradeoff between detection and localization. An example of the result obtained is presented with a /spl beta/-version of the method (monodimensional, without detection of the local maximums and without taking into account all our propositions).","PeriodicalId":415923,"journal":{"name":"Proceedings of Third International Symposium on Time-Frequency and Time-Scale Analysis (TFTS-96)","volume":"30 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":"134149352","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: 2
The local Karhunen-Loeve bases 当地Karhunen-Loeve基地
Proceedings of Third International Symposium on Time-Frequency and Time-Scale Analysis (TFTS-96) Pub Date : 1996-06-18 DOI: 10.1109/TFSA.1996.546703
R. Coifman, N. Saito
{"title":"The local Karhunen-Loeve bases","authors":"R. Coifman, N. Saito","doi":"10.1109/TFSA.1996.546703","DOIUrl":"https://doi.org/10.1109/TFSA.1996.546703","url":null,"abstract":"We propose yet another dictionary of orthonormal bases (which has the same tree structure as the popular wavelet packet or local trigonometric dictionaries) adapted to a given ensemble of signals. These orthogonal waveforms are generated by a set of locally adapted versions of the Karhunen-Loeve (KL) transform. The basis vectors in this dictionary represent local features in the time-frequency plane compared to the standard KL basis vectors. Because of the structure of the bases, the best basis selection algorithm of Coifman-Wickerhauser is readily applicable. Moreover, no a priori choice of conjugated quadrature filters or cosine/sine polarity is necessary; it is completely data driven. The computational cost to build this dictionary is comparable to or potentially less than that of the standard KL transform. As an application, we give an example of clustering geophysical acoustic waveforms.","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":"122056271","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: 23
Signal estimation using adapted tree-structured bases and the MDL principle 采用自适应树结构基和MDL原理的信号估计
Proceedings of Third International Symposium on Time-Frequency and Time-Scale Analysis (TFTS-96) Pub Date : 1996-06-18 DOI: 10.1109/TFSA.1996.546706
P. Moulin
{"title":"Signal estimation using adapted tree-structured bases and the MDL principle","authors":"P. Moulin","doi":"10.1109/TFSA.1996.546706","DOIUrl":"https://doi.org/10.1109/TFSA.1996.546706","url":null,"abstract":"We present a new signal denoising technique based on adapted tree-structured bases and the following paradigms: (a) use of the minimum description length (MDL) principle for estimating the signal in each branch of the tree and the best tree structure; (b) use of signal-adapted filter banks.","PeriodicalId":415923,"journal":{"name":"Proceedings of Third International Symposium on Time-Frequency and Time-Scale Analysis (TFTS-96)","volume":"32 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":"122137635","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: 32
Instantaneous frequency estimation using the crossterm deleted Wigner representation (CDWR) 基于交叉项删除维格纳表示(CDWR)的瞬时频率估计
Proceedings of Third International Symposium on Time-Frequency and Time-Scale Analysis (TFTS-96) Pub Date : 1996-06-18 DOI: 10.1109/TFSA.1996.547470
S. Kadambe, R. Orr
{"title":"Instantaneous frequency estimation using the crossterm deleted Wigner representation (CDWR)","authors":"S. Kadambe, R. Orr","doi":"10.1109/TFSA.1996.547470","DOIUrl":"https://doi.org/10.1109/TFSA.1996.547470","url":null,"abstract":"In this paper, an instantaneous frequency (IF) estimator based on the crossterm deleted Wigner representation (CDWR) is described. The performance of this estimator is verified by deriving the mean and the variance of the estimate. It has been demonstrated that the estimator is unbiased minimum variance under certain constraints. The Cramer-Rao lower bound for the two types of signals considered here are also derived. From the experimental results it can be seen that the mean square error of the estimates of the IF of these two types of signals is close to the theoretical bound at signal to noise ratios (SNR) greater than -3 dB.","PeriodicalId":415923,"journal":{"name":"Proceedings of Third International Symposium on Time-Frequency and Time-Scale Analysis (TFTS-96)","volume":"11 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":"130362827","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: 5
An approach to the polynomial Wigner distributions 多项式维格纳分布的一种方法
Proceedings of Third International Symposium on Time-Frequency and Time-Scale Analysis (TFTS-96) Pub Date : 1996-06-18 DOI: 10.1109/TFSA.1996.546709
S. Stankovic, L. Stanković
{"title":"An approach to the polynomial Wigner distributions","authors":"S. Stankovic, L. Stanković","doi":"10.1109/TFSA.1996.546709","DOIUrl":"https://doi.org/10.1109/TFSA.1996.546709","url":null,"abstract":"The distribution concentration along the instantaneous frequency is one of the interesting research topics in time frequency analysis. The oldest and simplest transform for time-frequency signal representation is the short-time Fourier transform (STFT). However, it may achieve high concentration at the instantaneous frequency only for signals whose frequency is constant. The quality of the time-frequency signal representation may be improved using the Wigner distribution. An analysis of the polynomial Wigner distributions, with respect to the concentration in the time-frequency plane is presented. A distribution with \"complex-time\" argument is defined. The concentration of the polynomial and the \"complex-time\" distributions is illustrated by examples.","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":"128887788","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: 3
Wavelet based fractal method in early human development 基于小波的人类早期发展分形方法
Proceedings of Third International Symposium on Time-Frequency and Time-Scale Analysis (TFTS-96) Pub Date : 1996-06-18 DOI: 10.1109/TFSA.1996.546694
M. Akay, E. Mulder
{"title":"Wavelet based fractal method in early human development","authors":"M. Akay, E. Mulder","doi":"10.1109/TFSA.1996.546694","DOIUrl":"https://doi.org/10.1109/TFSA.1996.546694","url":null,"abstract":"Fractal methods have found to be useful in characterizing biomedical signals. The use of fractal estimation requires the estimation of parameter H, which is directly related to the fractal dimension D. However, traditional fractal analysis requires that the biomedical signals be stationary. Here, the authors propose a novel approach which is a combination of the wavelet transform and fractal estimators to characterize the human fetal breathing signals. This study was performed on 26 fetuses. The variances of the wavelet coefficients were estimated at each scale. The slope of the representation on a logarithmic plot from the scales 5 to 1 was used to estimate the fractal dimension of the fetal breathing signals. The authors' results suggested that fetal breathing rates have a rough structure.","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":"129226546","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: 2
Statistical analysis of subband adaptive filters 子带自适应滤波器的统计分析
Proceedings of Third International Symposium on Time-Frequency and Time-Scale Analysis (TFTS-96) Pub Date : 1996-06-18 DOI: 10.1109/TFSA.1996.546689
S. Ohno
{"title":"Statistical analysis of subband adaptive filters","authors":"S. Ohno","doi":"10.1109/TFSA.1996.546689","DOIUrl":"https://doi.org/10.1109/TFSA.1996.546689","url":null,"abstract":"This paper presents an analysis of subband adaptive digital filters (ADF) for a stationary input. First, the subband adaptive filtering scheme is reexpressed by the polyphase matrices of the filter bank and the unknown system. Based on this structure the subband ADF with cross terms is studied. Then, for the conventional subband ADF, the optimal subband filters and the time-averaged mean-squared error are treated in the frequency domain. These representations enable us to easily see the aliasing effects in subband adaptive filtering.","PeriodicalId":415923,"journal":{"name":"Proceedings of Third International Symposium on Time-Frequency and Time-Scale Analysis (TFTS-96)","volume":"107 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":"117225610","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
Adaptive nonuniform sampling delta modulation for image processing 图像处理中的自适应非均匀采样增量调制
Proceedings of Third International Symposium on Time-Frequency and Time-Scale Analysis (TFTS-96) Pub Date : 1996-06-18 DOI: 10.1109/TFSA.1996.547465
S. Leung, Y.S. Zhu, C. M. Wong, K.K. Wong
{"title":"Adaptive nonuniform sampling delta modulation for image processing","authors":"S. Leung, Y.S. Zhu, C. M. Wong, K.K. Wong","doi":"10.1109/TFSA.1996.547465","DOIUrl":"https://doi.org/10.1109/TFSA.1996.547465","url":null,"abstract":"A novel image compression method based on a adaptive nonuniform sampling delta modulation technique is presented. An edge restoration algorithm is also developed for improving the quality of the reconstructed image. Simulation results have shown that the SNR of the proposed technique is higher than that of the linear delta modulation (LDM), adaptive delta modulation (ADM) and nonuniform sampling delta modulation (NS-DM) techniques.","PeriodicalId":415923,"journal":{"name":"Proceedings of Third International Symposium on Time-Frequency and Time-Scale Analysis (TFTS-96)","volume":"51 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":"122818765","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: 7
Redundancy in a frame of wavelets-based matched-filter 基于小波匹配滤波的帧冗余
Proceedings of Third International Symposium on Time-Frequency and Time-Scale Analysis (TFTS-96) Pub Date : 1996-06-18 DOI: 10.1109/TFSA.1996.547462
O. Lemoine, P. Abry
{"title":"Redundancy in a frame of wavelets-based matched-filter","authors":"O. Lemoine, P. Abry","doi":"10.1109/TFSA.1996.547462","DOIUrl":"https://doi.org/10.1109/TFSA.1996.547462","url":null,"abstract":"We propose in this paper a formulation for the matched-filter (MF) based on the frame of wavelets. We precisely compare the performance of the time-domain MF to that of this wavelet-based MF, with respect to the level of redundancy of the sampling of the time-scale plane, or equivalently, of the frame. The main result is that the redundancy of the discrete wavelet transform, instead of improving the detection performance, introduces false alarms which degrades this performance in the sense of the Neyman-Pearson criterion.","PeriodicalId":415923,"journal":{"name":"Proceedings of Third International Symposium on Time-Frequency and Time-Scale Analysis (TFTS-96)","volume":"26 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":"130872535","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: 2
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