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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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Time-frequency transform vs. Fourier transform for radar imaging 雷达成像的时频变换与傅立叶变换
Proceedings of Third International Symposium on Time-Frequency and Time-Scale Analysis (TFTS-96) Pub Date : 1996-06-18 DOI: 10.1109/TFSA.1996.550074
V. Chen, S. Qian
{"title":"Time-frequency transform vs. Fourier transform for radar imaging","authors":"V. Chen, S. Qian","doi":"10.1109/TFSA.1996.550074","DOIUrl":"https://doi.org/10.1109/TFSA.1996.550074","url":null,"abstract":"Conventional radar imaging systems use the Fourier transform for reconstruction of radar images. To use the Fourier transform adequately, some restrictions must be applied. Due to target's motion and manoeuvring, the reconstructed image by using Fourier transform becomes smeared. Therefore, some sophisticated motion compensation procedures must be applied to produce a clear image. However, the restrictions of Fourier transform can be lifted if a high resolution time-frequency transform can be used to retrieve the Doppler information. By replacing the conventional Fourier transform with the joint time-frequency transform, a 2-D range-Doppler Fourier frame becomes a 3-D time-range-Doppler cube. With sampling in time, a sequence of clear 2-D range-Doppler images can be simply reconstructed without using sophisticated motion compensation.","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":"131066694","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: 11
Using Malvar wavelets for transient detection 利用马尔瓦小波进行瞬态检测
Proceedings of Third International Symposium on Time-Frequency and Time-Scale Analysis (TFTS-96) Pub Date : 1996-06-18 DOI: 10.1109/TFSA.1996.547455
P. Ravier, P. Amblard
{"title":"Using Malvar wavelets for transient detection","authors":"P. Ravier, P. Amblard","doi":"10.1109/TFSA.1996.547455","DOIUrl":"https://doi.org/10.1109/TFSA.1996.547455","url":null,"abstract":"This paper is devoted to the detection of transient acoustic signals in very low signal-to-noise ratio contexts. The proposed algorithm uses the adaptive Malvar wavelet transform. It leads to a partition of the signal which is \"optimal\" according to a criteria that tests the Gaussian nature of the segments. A statistic based on the kurtosis is computed from this segmentation.","PeriodicalId":415923,"journal":{"name":"Proceedings of Third International Symposium on Time-Frequency and Time-Scale Analysis (TFTS-96)","volume":"9 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":"132507588","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: 9
On the effects of random sampling on spectral estimation of linear FM signals by means of the pseudo-discrete Wigner-Ville distribution 用伪离散Wigner-Ville分布研究随机抽样对线性调频信号频谱估计的影响
Proceedings of Third International Symposium on Time-Frequency and Time-Scale Analysis (TFTS-96) Pub Date : 1996-06-18 DOI: 10.1109/TFSA.1996.546707
Laurent Simon, J. Valière, C. Depollier
{"title":"On the effects of random sampling on spectral estimation of linear FM signals by means of the pseudo-discrete Wigner-Ville distribution","authors":"Laurent Simon, J. Valière, C. Depollier","doi":"10.1109/TFSA.1996.546707","DOIUrl":"https://doi.org/10.1109/TFSA.1996.546707","url":null,"abstract":"The effects of instabilities of sampling on spectra estimation are studied in the case of linear FM signals by means of the pseudo-discrete Wigner-Ville distribution (PDWVD). We show that the PDWVD allows one to extract the instantaneous frequency of the randomly sampled signal. The effects of random and non-uniform sampling are studied. Two sampling methods are analysed: an independent uniform jitter and a determinist accumulated sampling. The effects of the sampling instabilities are given in an analytic form, in terms of the frequency accuracy of the instantaneous frequency (IF) and in terms of the increase of the sidelobe level.","PeriodicalId":415923,"journal":{"name":"Proceedings of Third International Symposium on Time-Frequency and Time-Scale Analysis (TFTS-96)","volume":"10 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":"133217934","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
Complementary sets of sequences: a filter bank approach 互补序列集:一种滤波器组方法
Proceedings of Third International Symposium on Time-Frequency and Time-Scale Analysis (TFTS-96) Pub Date : 1996-06-18 DOI: 10.1109/TFSA.1996.546690
S. Burley, M. Darnell
{"title":"Complementary sets of sequences: a filter bank approach","authors":"S. Burley, M. Darnell","doi":"10.1109/TFSA.1996.546690","DOIUrl":"https://doi.org/10.1109/TFSA.1996.546690","url":null,"abstract":"The relationship between orthogonal finite impulse response filter bank structures, and orthonormal bases of compactly supported wavelets is a well-developed theory. In this paper, we identify further relationships between the design and construction of complementary pairs of sequences, filter banks satisfying the condition for perfect reconstruction and the property of losslessness. We then develop a construction method which enables a new class of complementary sequences to be formulated. Finally, we generalise these new sequences to form complementary sets, thus increasing the number of possible application areas for this class of sequences.","PeriodicalId":415923,"journal":{"name":"Proceedings of Third International Symposium on Time-Frequency and Time-Scale Analysis (TFTS-96)","volume":"112 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":"132087288","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
Periodic autoregressive time-frequency analysis for monitoring of rotating machinery with variable period 变周期旋转机械监测的周期自回归时频分析
Proceedings of Third International Symposium on Time-Frequency and Time-Scale Analysis (TFTS-96) Pub Date : 1996-06-18 DOI: 10.1109/TFSA.1996.550093
J. Spanjaard, P. Sherman, L. White, S. Lau
{"title":"Periodic autoregressive time-frequency analysis for monitoring of rotating machinery with variable period","authors":"J. Spanjaard, P. Sherman, L. White, S. Lau","doi":"10.1109/TFSA.1996.550093","DOIUrl":"https://doi.org/10.1109/TFSA.1996.550093","url":null,"abstract":"The development of a periodic autoregressive spectral estimator which is insensitive to variations in period is considered. The extended Kalman filter is investigated for estimation of the period. This estimate is then incorporated into a rotational framework to produce a time-varying spectral estimate for a nominally periodic system. It is expected that the method will be useful for monitoring the intracycle behaviour of rotating machinery such as diesel engines, compressors, gears and bearings. Use of the short time Fourier transform for variable speed envelope analysis is also shown to be a necessary tool for detection of faults in low, variable speed rotating machinery.","PeriodicalId":415923,"journal":{"name":"Proceedings of Third International Symposium on Time-Frequency and Time-Scale Analysis (TFTS-96)","volume":"41 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":"127701273","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
A study of refinable function vectors via a nonlinear operator 用非线性算子研究可细化函数向量
Proceedings of Third International Symposium on Time-Frequency and Time-Scale Analysis (TFTS-96) Pub Date : 1996-06-18 DOI: 10.1109/TFSA.1996.547472
Ying Huang, B. Suter
{"title":"A study of refinable function vectors via a nonlinear operator","authors":"Ying Huang, B. Suter","doi":"10.1109/TFSA.1996.547472","DOIUrl":"https://doi.org/10.1109/TFSA.1996.547472","url":null,"abstract":"This paper studies a certain nonlinear operator T from L/sup 2/(R,C/sup N/) to itself under which every refinable function vector is a fixed point. The iterations T/sup n/f of T on any f/spl isin/L/sup 2/(R,C/sup N/) with the Riesz basis property are investigated; they turn out to be the \"cascade algorithm\" iterates of f with weights depending on f only. The paper also gives conditions for convergence of T/sup m/f to a limit in different topologies.","PeriodicalId":415923,"journal":{"name":"Proceedings of Third International Symposium on Time-Frequency and Time-Scale Analysis (TFTS-96)","volume":"101 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":"128975279","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
Linear prediction and filter-banks: two complementary techniques in L/sup /spl infin//-norm compression 线性预测和滤波器组:L/sup /spl中//-范数压缩中的两种互补技术
Proceedings of Third International Symposium on Time-Frequency and Time-Scale Analysis (TFTS-96) Pub Date : 1996-06-18 DOI: 10.1109/TFSA.1996.546685
L. Karray
{"title":"Linear prediction and filter-banks: two complementary techniques in L/sup /spl infin//-norm compression","authors":"L. Karray","doi":"10.1109/TFSA.1996.546685","DOIUrl":"https://doi.org/10.1109/TFSA.1996.546685","url":null,"abstract":"This paper compares two coding techniques based on L/sup /spl infin//-norm and confidence interval criteria: one uses linear prediction and the other filter-banks. It shows that they are complementary, and proposes a combination of the two decorrelation techniques within the same coding scheme.","PeriodicalId":415923,"journal":{"name":"Proceedings of Third International Symposium on Time-Frequency and Time-Scale Analysis (TFTS-96)","volume":"168 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":"115972784","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
Bayesian estimation of instantaneous frequency 瞬时频率的贝叶斯估计
Proceedings of Third International Symposium on Time-Frequency and Time-Scale Analysis (TFTS-96) Pub Date : 1996-06-18 DOI: 10.1109/TFSA.1996.546672
A. Doucet, P. Duvaut
{"title":"Bayesian estimation of instantaneous frequency","authors":"A. Doucet, P. Duvaut","doi":"10.1109/TFSA.1996.546672","DOIUrl":"https://doi.org/10.1109/TFSA.1996.546672","url":null,"abstract":"The problem addressed in this paper is the Bayesian estimation of the instantaneous frequency for parametric nonstationary processes. We carry out Bayesian inference on the unknown parameters using powerful stochastic algorithms, the Markov chain Monte Carlo methods. Applications of such techniques to several models are presented and results of a simulation for one of those models are presented.","PeriodicalId":415923,"journal":{"name":"Proceedings of Third International Symposium on Time-Frequency and Time-Scale Analysis (TFTS-96)","volume":"94 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":"116731242","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
Binary morphological subband decomposition for image coding 二值形态子带分解图像编码
Proceedings of Third International Symposium on Time-Frequency and Time-Scale Analysis (TFTS-96) Pub Date : 1996-06-18 DOI: 10.1109/TFSA.1996.547487
M. Gurcan, O. N. Gerek, A. Cetin
{"title":"Binary morphological subband decomposition for image coding","authors":"M. Gurcan, O. N. Gerek, A. Cetin","doi":"10.1109/TFSA.1996.547487","DOIUrl":"https://doi.org/10.1109/TFSA.1996.547487","url":null,"abstract":"A binary waveform coding method based on morphological subband decomposition coupled with embedded zero-tree and entropy coding is described. This method can be utilized in text compression or bit-plane coding of images. Binary morphological subband decomposition operations are carried out in the Galois field(2), resulting in a computationally efficient structure. Simulation studies are presented.","PeriodicalId":415923,"journal":{"name":"Proceedings of Third International Symposium on Time-Frequency and Time-Scale Analysis (TFTS-96)","volume":"15 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":"115351212","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: 13
Time-frequency vector quantization with application to isolated world recognition 时频矢量量化及其在孤立世界识别中的应用
Proceedings of Third International Symposium on Time-Frequency and Time-Scale Analysis (TFTS-96) Pub Date : 1996-06-18 DOI: 10.1109/TFSA.1996.550101
F. Rogers, P. van Aken, V. Cuperman
{"title":"Time-frequency vector quantization with application to isolated world recognition","authors":"F. Rogers, P. van Aken, V. Cuperman","doi":"10.1109/TFSA.1996.550101","DOIUrl":"https://doi.org/10.1109/TFSA.1996.550101","url":null,"abstract":"In low-complexity speaker-independent isolated word recognition systems based on vector quantization (VQ) with multiple codebooks, the performance of the VQ has a big impact on the overall performance of the system. This paper introduces two techniques for combining spectral and temporal information in the VQ process, with the objective of improving the recognition performance, while maintaining or decreasing the storage requirement. The proposed techniques are compared to an existent method based on the probability distribution of the time of occurrence of spectral vectors in the quantization process. The experimental results show that the proposed methods improve significantly the recognition performance and have similar or lower memory requirements to the reference method.","PeriodicalId":415923,"journal":{"name":"Proceedings of Third International Symposium on Time-Frequency and Time-Scale Analysis (TFTS-96)","volume":"83 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":"116101399","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
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