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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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An adaptive tree search algorithm with application to multiresolution based perceptive audio coding 一种应用于多分辨率感知音频编码的自适应树搜索算法
Proceedings of Third International Symposium on Time-Frequency and Time-Scale Analysis (TFTS-96) Pub Date : 1996-06-18 DOI: 10.1109/TFSA.1996.546700
N. G. Prelcic, A. Pena
{"title":"An adaptive tree search algorithm with application to multiresolution based perceptive audio coding","authors":"N. G. Prelcic, A. Pena","doi":"10.1109/TFSA.1996.546700","DOIUrl":"https://doi.org/10.1109/TFSA.1996.546700","url":null,"abstract":"Search algorithms for selecting signal decompositions based on the minimization of a cost functional have been proposed in the literature, in addition to several additive and non-additive information costs. We introduce a new cost function and a search algorithm built from a perceptual criterion. Their efficiency is demonstrated with results showing higher quality compressed audio signals than preliminary approaches at similar bit-rates.","PeriodicalId":415923,"journal":{"name":"Proceedings of Third International Symposium on Time-Frequency and Time-Scale Analysis (TFTS-96)","volume":"114 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":"125417812","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
A wavelet based recursive reconstruction algorithm for linear measurements 基于小波的线性测量递归重构算法
Proceedings of Third International Symposium on Time-Frequency and Time-Scale Analysis (TFTS-96) Pub Date : 1996-06-18 DOI: 10.1109/TFSA.1996.546679
O. Arikan
{"title":"A wavelet based recursive reconstruction algorithm for linear measurements","authors":"O. Arikan","doi":"10.1109/TFSA.1996.546679","DOIUrl":"https://doi.org/10.1109/TFSA.1996.546679","url":null,"abstract":"A recursive algorithm is proposed to obtain an efficient regularized least squares solution to large linear system of equations which arises in many physical measurement models. The algorithm recursively updates the solution in an increasingly larger dimensional subspace whose basis vectors are chosen as a subset of a complete wavelet basis. Robust criterions on how to chose the basis vectors at each iteration, and when to stop the iterations are given.","PeriodicalId":415923,"journal":{"name":"Proceedings of Third International Symposium on Time-Frequency and Time-Scale Analysis (TFTS-96)","volume":"39 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":"114769884","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
Wavelet coefficients, quadrature mirror filters and the group SO(4) 小波系数、正交镜滤波器和群SO(4)
Proceedings of Third International Symposium on Time-Frequency and Time-Scale Analysis (TFTS-96) Pub Date : 1996-06-18 DOI: 10.1109/TFSA.1996.546682
S.D. Howard, S. Sirianunpiboon
{"title":"Wavelet coefficients, quadrature mirror filters and the group SO(4)","authors":"S.D. Howard, S. Sirianunpiboon","doi":"10.1109/TFSA.1996.546682","DOIUrl":"https://doi.org/10.1109/TFSA.1996.546682","url":null,"abstract":"Let c=(c/sub j/)/sub j/spl isin//sub //Z/spl isin/l/sup 2/ and u(/spl xi/) be its Fourier series. We consider the local or gauge group of linear transformations preserving the combined energy spectral density at angular frequencies offset by /spl pi/, |u(/spl xi/)|/sup 2/+|u(/spl xi/+/spl pi/)|/sup 2/, separately at each /spl xi//spl isin/[0,/spl pi/]. This gauge transformation group consists of the mappings from [0,/spl pi/]/spl rarr/SO(4), the group of 4-dimensional rotations. It is shown that the usual decomposition of a discrete sequence into scale and wavelet coefficients is a consequence of the local decomposition of the 4-dimensional (vector) represention of the group SO(4) as a tensor product of the half-spin representations of its associated spin group, Spin(4).","PeriodicalId":415923,"journal":{"name":"Proceedings of Third International Symposium on Time-Frequency and Time-Scale Analysis (TFTS-96)","volume":"69 6 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":"117238113","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
Reduction of autoregressive noise with shift-invariant wavelet-packets 平移不变性小波包的自回归降噪
Proceedings of Third International Symposium on Time-Frequency and Time-Scale Analysis (TFTS-96) Pub Date : 1996-06-18 DOI: 10.1109/TFSA.1996.546705
N. Whitmal, J. C. Rutledge, J. Cohen
{"title":"Reduction of autoregressive noise with shift-invariant wavelet-packets","authors":"N. Whitmal, J. C. Rutledge, J. Cohen","doi":"10.1109/TFSA.1996.546705","DOIUrl":"https://doi.org/10.1109/TFSA.1996.546705","url":null,"abstract":"We present a new wavelet-based method for reducing additive autoregressive noise. The method uses a shift-invariant wavelet-packet transform to facilitate a linear transformation of wavelet-packet basis vectors. The transformed basis vectors are shown to be better suited than the original basis vectors for use in conventional wavelet-based denoising algorithms which use the minimum description length (MDL) or thresholding approaches. A computational example is presented which demonstrates the advantages of the new algorithm. Autoregressive (AR) models provide a useful tool for adapting the MDL algorithm to the reduction of correlated noise. A straightforward adaptation involves fitting an AR model to the noise component, building an FIR prediction-error filter from the AR model, and using the filter to whiten the noise component.","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":"131351027","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
On estimation of instantaneous bandwidth 关于瞬时带宽的估计
Proceedings of Third International Symposium on Time-Frequency and Time-Scale Analysis (TFTS-96) Pub Date : 1996-06-18 DOI: 10.1109/TFSA.1996.547215
B. Ristic, B. Boashash
{"title":"On estimation of instantaneous bandwidth","authors":"B. Ristic, B. Boashash","doi":"10.1109/TFSA.1996.547215","DOIUrl":"https://doi.org/10.1109/TFSA.1996.547215","url":null,"abstract":"In many applications, the instantaneous frequency of the observed signal describes some physical phenomenon of interest. The instantaneous frequency can be interpreted as the mean frequency at a particular instant of time. Then it is natural to supplement any measure of the instantaneous frequency by the estimate of its instantaneous spread or bandwidth. Assuming a polynomial model of log-envelope of an AM-FM signal, the paper first considers the maximum likelihood (ML) estimation and Cramer-Rao bounds for instantaneous bandwidth (IB). Then two simpler algorithms for IB estimation are proposed: the log-envelope difference algorithm and the LS method.","PeriodicalId":415923,"journal":{"name":"Proceedings of Third International Symposium on Time-Frequency and Time-Scale Analysis (TFTS-96)","volume":"23 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":"131491127","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
High-speed moving sources analysis 高速移动源分析
Proceedings of Third International Symposium on Time-Frequency and Time-Scale Analysis (TFTS-96) Pub Date : 1996-06-18 DOI: 10.1109/TFSA.1996.550076
F. Poisson, C. Depollier, O. Coste
{"title":"High-speed moving sources analysis","authors":"F. Poisson, C. Depollier, O. Coste","doi":"10.1109/TFSA.1996.550076","DOIUrl":"https://doi.org/10.1109/TFSA.1996.550076","url":null,"abstract":"This article describes the first step of moving acoustic sources analysis. Time-frequency and time-scale tools are used to characterize the signal received on a fixed microphone. It permits one to improve localisation methods. Simulations are presented in case of a sinusoidal source. An experiment with a known source fixed on a high speed train (TGV) is carried out. Then, the signal of a TGV coming by in real operating conditions is analysed.","PeriodicalId":415923,"journal":{"name":"Proceedings of Third International Symposium on Time-Frequency and Time-Scale Analysis (TFTS-96)","volume":"65 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":"131712104","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
Recursive implementation of some time-frequency representations 一些时频表示的递归实现
Proceedings of Third International Symposium on Time-Frequency and Time-Scale Analysis (TFTS-96) Pub Date : 1996-06-18 DOI: 10.1109/TFSA.1996.547476
C. Richard, R. Lengellé
{"title":"Recursive implementation of some time-frequency representations","authors":"C. Richard, R. Lengellé","doi":"10.1109/TFSA.1996.547476","DOIUrl":"https://doi.org/10.1109/TFSA.1996.547476","url":null,"abstract":"Cohen's class of time-frequency distributions (CTFDs), which includes the spectrogram and the Wigner-Ville distribution, has significant potential for the analysis of non-stationary signals. In order to efficiently compute long signal time-frequency representations, we propose fast algorithms using a recursive approach. First, we introduce a recursive algorithm dedicated to the spectrogram computation. We show that rectangular, half-sine, Hamming, Hanning and Blackman functions can be used as running \"short-time\" windows. Then the previous algorithm is extended to specific CTFDs. We show that the windows mentioned above can also be used to compute recursively smoothed pseudo Wigner-Ville distributions. Finally, we show that the constraints on candidate windows are not very restrictive: any function (assumed periodic) can be used in practice as long as it admits a \"short enough\" Fourier series decomposition.","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":"129735097","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
Improved FM demodulation in a fading environment 在衰落环境下改进调频解调
Proceedings of Third International Symposium on Time-Frequency and Time-Scale Analysis (TFTS-96) Pub Date : 1996-06-18 DOI: 10.1109/TFSA.1996.546673
H. Kwok, D.L. Jones
{"title":"Improved FM demodulation in a fading environment","authors":"H. Kwok, D.L. Jones","doi":"10.1109/TFSA.1996.546673","DOIUrl":"https://doi.org/10.1109/TFSA.1996.546673","url":null,"abstract":"Analog frequency modulation remains an important format for wireless communications, such as in the AMPS cellular telephone standard. Frequency modulation codes the signal as the instantaneous frequency of the transmitted waveform, so FM demodulation corresponds to the problem of instantaneous frequency (IF) estimation. Time-frequency methods have been shown to provide better IF estimates at low-SNR, which makes them attractive for FM demodulation in low-SNR scenarios. However, fading is a common problem in mobile wireless communications. We demonstrate here that a high-performance IF estimation method based on an adaptive short-time Fourier transform works well under fading conditions and offers much better performance than traditional methods such as a phase lock loop (PLL). While more expensive than PLLs, basic versions of this approach should be implementable in real time on a single DSP microprocessor.","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":"114503825","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
Theory and design of shift-invariant filter banks and wavelets 平移不变滤波器组和小波的理论与设计
Proceedings of Third International Symposium on Time-Frequency and Time-Scale Analysis (TFTS-96) Pub Date : 1996-06-18 DOI: 10.1109/TFSA.1996.546683
Y. Hui, C. Kok, T.Q. Nguyen
{"title":"Theory and design of shift-invariant filter banks and wavelets","authors":"Y. Hui, C. Kok, T.Q. Nguyen","doi":"10.1109/TFSA.1996.546683","DOIUrl":"https://doi.org/10.1109/TFSA.1996.546683","url":null,"abstract":"A drawback of the critical-sampling multirate system is its shift-variant property at the subband output. This prevents wavelets from many applications where shift-invariance is required. For a given set of filter coefficients and cost function, all of the existing methods solve the problem by finding the path in the decomposition tree that minimizes shift-variance with respect to a given cost function. This procedure is signal dependent and is inefficient, especially for long data sets and images, since the subband decomposition has to be performed for all shifts of input signal during the processing time. In this paper, we establish a framework for a shift-invariant filter bank by connecting the relation between the polyphase representation and shift-invariant property of filter banks. Theory, analysis, and design are presented, and comparison to the existing systems is discussed. Design examples and simulations on image coding are presented.","PeriodicalId":415923,"journal":{"name":"Proceedings of Third International Symposium on Time-Frequency and Time-Scale Analysis (TFTS-96)","volume":"77 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":"124886757","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
Analysing heart murmurs using time-frequency methods 用时频法分析心脏杂音
Proceedings of Third International Symposium on Time-Frequency and Time-Scale Analysis (TFTS-96) Pub Date : 1996-06-18 DOI: 10.1109/TFSA.1996.550073
P. White, W. Collis, A. Salmon
{"title":"Analysing heart murmurs using time-frequency methods","authors":"P. White, W. Collis, A. Salmon","doi":"10.1109/TFSA.1996.550073","DOIUrl":"https://doi.org/10.1109/TFSA.1996.550073","url":null,"abstract":"Discusses the use of time-frequency methods in the detection and analysis of heart murmurs in Phono-CardioGraphic (PCG) signals. These heart sounds can yield important diagnostic information and are measured in a non-invasive fashion. The methods employed are developed heuristically based on a model of heart sounds, but their connection to existing techniques is also presented. The method exploits averaged versions of the Pseudo-Wigner-Ville distribution (PWVD). The algorithms are shown to detect two types of heart murmur and to be able to distinguish between them, a task which requires an experienced human listener.","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":"127726527","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
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