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Fourth International Symposium on Signal Processing and Its Applications最新文献

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Adaptive Multiple Snapshot Beamforming for the Rejection of Non Stationary and Coherent Interferers 用于抑制非平稳和相干干扰的自适应多快照波束形成
Fourth International Symposium on Signal Processing and Its Applications Pub Date : 1900-01-01 DOI: 10.1109/ISSPA.1996.615122
Dan Madurashinghe
{"title":"Adaptive Multiple Snapshot Beamforming for the Rejection of Non Stationary and Coherent Interferers","authors":"Dan Madurashinghe","doi":"10.1109/ISSPA.1996.615122","DOIUrl":"https://doi.org/10.1109/ISSPA.1996.615122","url":null,"abstract":"In beamforming applications, the degrees of freedom or the maximum number of signals allowed in the system, is an important number that will decide the number of sensors and hardware components required to achieve the desired performance. A flexible algorithm that allows us to control this number depenhng on the environment in which it operates is presented. The maximum degrees of freedom for an N element array is N - 1 for the incoherent case and (N-l)/2 for the fully coherent case. The most noticeable feature in this algorithm is that it can be implemented in real time since the updating of the weight equation involves only a rank one update each time a new snapshot arrives.","PeriodicalId":359344,"journal":{"name":"Fourth International Symposium on Signal Processing and Its Applications","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114163267","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
Combined Optimisation of Baseforms and Subword Models for an Hmm Based Speech Recogniser 基于Hmm的语音识别基形和子词模型的组合优化
Fourth International Symposium on Signal Processing and Its Applications Pub Date : 1900-01-01 DOI: 10.1109/ISSPA.1996.615746
T. Holter, T. Svendsen
{"title":"Combined Optimisation of Baseforms and Subword Models for an Hmm Based Speech Recogniser","authors":"T. Holter, T. Svendsen","doi":"10.1109/ISSPA.1996.615746","DOIUrl":"https://doi.org/10.1109/ISSPA.1996.615746","url":null,"abstract":"In this paper a framework for combined optimisation of baseforms and subword models for a speech recogniser is proposed. Given a set of subword Hidden Markov Models (HMMs) and a set of utterances of a specific word, the modified tree-trellis algorithm and the BaumWelch re-estimation procedure is used iteratively to achieve a combined optimisation of baseforms and subword models. The DARPA Resource Management (RM) database was used to evaluate the combined optimisation scheme. The proposed method resulted in a monotonic increase in the likelihood score of both test- and training data. When compared to the initial lexicon derived from the DARPA RM-distribution and a set of initial HMMs, a 13% reduction in word error rate is achieved at best.","PeriodicalId":359344,"journal":{"name":"Fourth International Symposium on Signal Processing and Its Applications","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130639223","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
Fractal Segmentation Using Multiresolution B-spline Wavelets 基于多分辨率b样条小波的分形分割
Fourth International Symposium on Signal Processing and Its Applications Pub Date : 1900-01-01 DOI: 10.1109/ISSPA.1996.615110
V. Anh, F. Gras, H. Tsui
{"title":"Fractal Segmentation Using Multiresolution B-spline Wavelets","authors":"V. Anh, F. Gras, H. Tsui","doi":"10.1109/ISSPA.1996.615110","DOIUrl":"https://doi.org/10.1109/ISSPA.1996.615110","url":null,"abstract":"Ihis paper presents a new method for obtaining high-resolution xlges of a natural image. The algorithm is based on the estimation 3f the local fractal dimension (FD) of the image using its local spectral density computed from the Fourier-wavelet transform. Using our high-resolution FD map, the FD and edge information is integrated into a region gowing algorithm for segmentation of nasural and real images. The efficiency of the method is illustrated on five real images.","PeriodicalId":359344,"journal":{"name":"Fourth International Symposium on Signal Processing and Its Applications","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126522061","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
4300 Megasamples/s Wave Digital Filter Implementation In Bit-parallel Tspc Circuit Technique 基于位并行Tspc电路技术的4300兆样本/s波数字滤波器的实现
Fourth International Symposium on Signal Processing and Its Applications Pub Date : 1900-01-01 DOI: 10.1109/ISSPA.1996.615131
J. Pihl, E. Aas
{"title":"4300 Megasamples/s Wave Digital Filter Implementation In Bit-parallel Tspc Circuit Technique","authors":"J. Pihl, E. Aas","doi":"10.1109/ISSPA.1996.615131","DOIUrl":"https://doi.org/10.1109/ISSPA.1996.615131","url":null,"abstract":"In this contribution we demonstrate how the TSPC circuit technique [I] when applied to bit-parallel carrysave (CS) wave digital filter architectures [4], provides considerable performance improvements over traditional implementations. Implementation results for a thirdorder lattice wave digital filter in a 0.8~ standard CMOS process indicate that a sample frequency of 300MHz is achievable, which is more than double the sample rate reported in previous works on the same filter[2],[5]. It is the high speed of the TSPC technique and absence of carry propagation in CS arithmetic, that provide the improvements.","PeriodicalId":359344,"journal":{"name":"Fourth International Symposium on Signal Processing and Its Applications","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114652037","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 Multistage Approach For Adaptive Time-scale Data Processing 一种多阶段自适应时间尺度数据处理方法
Fourth International Symposium on Signal Processing and Its Applications Pub Date : 1900-01-01 DOI: 10.1109/ISSPA.1996.615148
S. E. Godfrey, Sherry E. Hammer
{"title":"A Multistage Approach For Adaptive Time-scale Data Processing","authors":"S. E. Godfrey, Sherry E. Hammer","doi":"10.1109/ISSPA.1996.615148","DOIUrl":"https://doi.org/10.1109/ISSPA.1996.615148","url":null,"abstract":"This paper addresses signal analysis of discrete signals containing disparate features in the presence of noise. Such data is typical in many practical applications, for example, sonar where data streams are comprised of both transient and long duration tones. While classic Fourier techniques are well suited for analysis of global regularites, time-frequency techniques are showing promise for finding the location and spatial distribution of spurious events. However, it is widely regarded that no single transformation performs best on all types of data. In this paper, enhanced signal rep resentation is addressed by introducing a multistage approach to adaptive signal processing of data containing disparate features. The first stage consists of data partitioning into segments of like features. The next entails determining the appropriate time-scale decomposition for each data segment. Application of the technique is performed on both simulated and actual sonar data sets and results are compared with outputs from single stage techniques.","PeriodicalId":359344,"journal":{"name":"Fourth International Symposium on Signal Processing and Its Applications","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114118407","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
Oth Radar Ahttenna Array Calibration Analysis 雷达天线阵列校准分析
Fourth International Symposium on Signal Processing and Its Applications Pub Date : 1900-01-01 DOI: 10.1109/ISSPA.1996.615051
I. Solomon, Y. Abramovich, D. Gray, S. Anderson
{"title":"Oth Radar Ahttenna Array Calibration Analysis","authors":"I. Solomon, Y. Abramovich, D. Gray, S. Anderson","doi":"10.1109/ISSPA.1996.615051","DOIUrl":"https://doi.org/10.1109/ISSPA.1996.615051","url":null,"abstract":"In this paper we look at the effect of model errors on the performance of the optimum minimum variance distortionless response (MVDR) processor, when the weights are obtained using the noise only covariance matrix. We not only consider the typical model errors : gain errors, phase error and sensor position errors; but also consider the effect of uncompensated mutual coupling. While the signal-to-noise ratio and beampointing error are robust to model errors, the sidelobes are shown to be very sensitive. Due to this sensitivity, under non-stationary interferer environments, we show that model errors can greatly worsen the attainable sub-clutter visibility (clutter-to-noise ratio).","PeriodicalId":359344,"journal":{"name":"Fourth International Symposium on Signal Processing and Its Applications","volume":"293 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117350973","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
An Intelligent Microphone Array for Speech Enhancement 一种用于语音增强的智能麦克风阵列
Fourth International Symposium on Signal Processing and Its Applications Pub Date : 1900-01-01 DOI: 10.1109/ISSPA.1996.615766
Yuchang Cao, S. Sridharan, M. Moody
{"title":"An Intelligent Microphone Array for Speech Enhancement","authors":"Yuchang Cao, S. Sridharan, M. Moody","doi":"10.1109/ISSPA.1996.615766","DOIUrl":"https://doi.org/10.1109/ISSPA.1996.615766","url":null,"abstract":"This paper describes the design of an intelligent microphone array system for speech enhancement. The proposed system consists of a non-linearly spaced array structure followed by a speech seeking unit, a dual-beamformer, a post-processing stage as well as an artificial neural network (ANN) central control unit. The system can seek and track the target speaker automatically and obtain an optimal output with the best quality and intelligibility. Extensive simulation results have shown that the proposed system is a useful device for speech signal acquisition in the presence of competing speech and/or background noise. The application of this technique include hands-free telephone and covert recording systems for forensic application.","PeriodicalId":359344,"journal":{"name":"Fourth International Symposium on Signal Processing and Its Applications","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124164107","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
On The Performance Analysis Of The Cdma Systems With Antenn-a Arrays 天线a阵列Cdma系统的性能分析
Fourth International Symposium on Signal Processing and Its Applications Pub Date : 1900-01-01 DOI: 10.1109/ISSPA.1996.615141
Jinho Choi
{"title":"On The Performance Analysis Of The Cdma Systems With Antenn-a Arrays","authors":"Jinho Choi","doi":"10.1109/ISSPA.1996.615141","DOIUrl":"https://doi.org/10.1109/ISSPA.1996.615141","url":null,"abstract":"The performance analysis of the code division multiple access (CDMA) system with antenna arrays has been considered in this paper. We define the array gain, which is proportional to the signal to interference plus noise ratio (SINR), and show that the array gain is varying over the angle of arrival (AOA) of the signal impinging on the antenna array. It means that the SINR of a user can differ from that of other user depending on the user‘s location. The average array gain is obtained with respect to the AOA. Using the average array gain, we can define the optimum antenna array that maximizes the average array gain. Some properties of the optimum antenna array are considered. From this, we observe that the uniform linear array (ULA) is closer to the optimum array than the uniform circular array (UCA).","PeriodicalId":359344,"journal":{"name":"Fourth International Symposium on Signal Processing and Its Applications","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122081186","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
An Hmm Soft-Output Decoder for Qam Signals with a Clustered Constellation 基于聚类星座的Qam信号Hmm软输出解码器
Fourth International Symposium on Signal Processing and Its Applications Pub Date : 1900-01-01 DOI: 10.1109/ISSPA.1996.615705
I. Collings, J. Moore
{"title":"An Hmm Soft-Output Decoder for Qam Signals with a Clustered Constellation","authors":"I. Collings, J. Moore","doi":"10.1109/ISSPA.1996.615705","DOIUrl":"https://doi.org/10.1109/ISSPA.1996.615705","url":null,"abstract":"This paper presents a new HMM soft-output decoder for QAM signals transmitted through narrow-band flat-fading channels, in the case where the signal constellation has points which are clustered into groups. Parallel HMM filters are used for QAM detection, with one filter for each group of constellation points. This greatly reduces the number of computations required. A Kalman Filter (KF) is then applied for channel estimation. The resulting adaptive algorithms appear as coupled KF and HMM filters. As well as having reduced computations, this approach does not require so called ‘hard-decoding-decisions’ to be made, which result s in better robustness to noise.","PeriodicalId":359344,"journal":{"name":"Fourth International Symposium on Signal Processing and Its Applications","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122100990","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
Quantisation Techniques for Prototype Waveforms 原型波形的量化技术
Fourth International Symposium on Signal Processing and Its Applications Pub Date : 1900-01-01 DOI: 10.1109/ISSPA.1996.615673
Duong H. Pham, I. Burnett
{"title":"Quantisation Techniques for Prototype Waveforms","authors":"Duong H. Pham, I. Burnett","doi":"10.1109/ISSPA.1996.615673","DOIUrl":"https://doi.org/10.1109/ISSPA.1996.615673","url":null,"abstract":"Speech coders based on Prototype Waveform techniques can produce speech at rates as low as 2.4kbIs. These coders represent the speech residual by a series of pitch length characteristic or prototype waveform which are aligned and interpolated to rcumstruct the excitation at the receiver. The Prototype Waveforms can be decomposed into noisy and periodic components for quantisation. This paper examines the different quantisation requirements of these two distinct, variable-length vector components and describes codebook solutions leading to near-Toll quality Multi-Rototype Waveform coders at bit-rates from 2.4 to4kbIs.","PeriodicalId":359344,"journal":{"name":"Fourth International Symposium on Signal Processing and Its Applications","volume":"482 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115630648","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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