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

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Adaptive Mean/median Filtering 自适应均值/中值滤波
Fourth International Symposium on Signal Processing and Its Applications Pub Date : 1996-11-03 DOI: 10.1109/ISSPA.1996.615772
J. Schroeder, Monica Chitre
{"title":"Adaptive Mean/median Filtering","authors":"J. Schroeder, Monica Chitre","doi":"10.1109/ISSPA.1996.615772","DOIUrl":"https://doi.org/10.1109/ISSPA.1996.615772","url":null,"abstract":"The use of median and averaging filters is fairly routine in signal processing applications. One problem in using such algorithms is the lack of objective criteria by which to decide whether an averager or a median filter is more appropriate. We formulate an L/sub p/ (1/spl les/p/spl les/2) normed filter where p is chosen as a function of the kurtosis of the residual vector; we restrict attention in this work to a mean filter (p=2) and a median filter (p=1). In order to highlight the effectiveness of this filtering algorithm we demonstrate reduced sum squared error by adaptively filtering a sinusoid in the presence of both additive white Gaussian noise and an impulsive noise component.","PeriodicalId":359344,"journal":{"name":"Fourth International Symposium on Signal Processing and Its Applications","volume":"74 3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124261038","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 Application of Recurrent Neural Networks to Low Bit Rate Speech Coding 递归神经网络在低比特率语音编码中的应用
Fourth International Symposium on Signal Processing and Its Applications Pub Date : 1996-10-03 DOI: 10.1109/ICSLP.1996.607116
M. Kohata
{"title":"An Application of Recurrent Neural Networks to Low Bit Rate Speech Coding","authors":"M. Kohata","doi":"10.1109/ICSLP.1996.607116","DOIUrl":"https://doi.org/10.1109/ICSLP.1996.607116","url":null,"abstract":"It is well known that the LSP coefficient which represents the speech spectrum envelope as one of the linear prediction coefficients, shows good performance for spectral interpolation along the time axis, but it is also known that the duration of interpolation is limited up to 20/spl sim/30 ms. This limitation makes it difficult to reduce the bit rate in very low bit rate speech coding. To resolve this problem, recurrent neural networks (RNN) were applied to interpolate LSP coefficients, and it was possible to increase the duration of interpolation to about 100 ms without so much degradation of the synthesized speech quality.","PeriodicalId":359344,"journal":{"name":"Fourth International Symposium on Signal Processing and Its Applications","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116415796","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
Effect of Speech Coders on Speech Recognition Performance 语音编码对语音识别性能的影响
Fourth International Symposium on Signal Processing and Its Applications Pub Date : 1996-10-03 DOI: 10.21437/ICSLP.1996-593
B. T. Lilly, K. Paliwal
{"title":"Effect of Speech Coders on Speech Recognition Performance","authors":"B. T. Lilly, K. Paliwal","doi":"10.21437/ICSLP.1996-593","DOIUrl":"https://doi.org/10.21437/ICSLP.1996-593","url":null,"abstract":"Speech coders with bitrates as low as 2.4 kbits/s are now being developedfor speechtransmissioninthe telecommunicationsindustry. For speechcodersto work at this reducedbitrate, somespeechinfor-mation hasto beremovedandit is onlynatural to expectthat the per-formanceof speechrecognitionsystemswill deteriorate whencoded speech is applied as input to a recognition system. In this paper, the results of a study to examine the effects speech coders have on speech recogntion are presented. Six different speech coders rang-ing from 4.8 kbits/s to 40 kbits/s are used with two different speech recognition systems 1) isolated word recogntion and 2) phoneme recogntion from continuous speech. The effects on speech recognition performance by tandeming eachof the speechcoders are also presented.","PeriodicalId":359344,"journal":{"name":"Fourth International Symposium on Signal Processing and Its Applications","volume":"61 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122122438","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: 64
Fir Filtering with Fpgas Using Quadrature Sigma-Delta Modulation Encoding 利用正交Sigma-Delta调制编码的fpga Fir滤波
Fourth International Symposium on Signal Processing and Its Applications Pub Date : 1996-09-23 DOI: 10.1109/ISSPA.1996.615770
C. Dick
{"title":"Fir Filtering with Fpgas Using Quadrature Sigma-Delta Modulation Encoding","authors":"C. Dick","doi":"10.1109/ISSPA.1996.615770","DOIUrl":"https://doi.org/10.1109/ISSPA.1996.615770","url":null,"abstract":"This paper addresses the problem of implementing narrow-band FIR filters using FPGAs. The method uses a tunable quadrature sigma-delta modulator to re-quantise a real- or complex-valued input stream to a reduced precision, so removing the requirement for a full multiplier in the filter hardware. This makes the technique very attractive for implementation using FPGAs. The re-quantisation process preserves the dynamic range of the signal components contained in the bandwidth of the filter, while shifting the re-quantisation noise to the spectral region to be rejected by the filter. The filter architecture described and its implementation using Xilinx FPGAs is presented.","PeriodicalId":359344,"journal":{"name":"Fourth International Symposium on Signal Processing and Its Applications","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131863885","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
Optimal HMM Processing Of Differentially Phase Modulated Communication Systems 差分相位调制通信系统的最优HMM处理
Fourth International Symposium on Signal Processing and Its Applications Pub Date : 1996-08-25 DOI: 10.1109/ISSPA.1996.615085
Emily Lane, J. Ford, J. Moore
{"title":"Optimal HMM Processing Of Differentially Phase Modulated Communication Systems","authors":"Emily Lane, J. Ford, J. Moore","doi":"10.1109/ISSPA.1996.615085","DOIUrl":"https://doi.org/10.1109/ISSPA.1996.615085","url":null,"abstract":"This paper investigates demodulation of differentially phase modulated signals (DPMS) using optimal HMM filters. The optimal HMM filter presented in the paper is computationally of order N 3 per time instant, where N is the number of message symbols. Previously, optimal HMM filters have been of computational order N 4 per time instant. Also, suboptimal HMM filters have be proposed of computation order N 2 per time instant. The approach presented in this paper uses two coupled HMM filters and exploits knowledge of their interdependence to achieve computational gains. A simulation study is also presented.","PeriodicalId":359344,"journal":{"name":"Fourth International Symposium on Signal Processing and Its Applications","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133483182","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
A Sar Moving Target Ambiguity Function Sar运动目标模糊度函数
Fourth International Symposium on Signal Processing and Its Applications Pub Date : 1900-01-01 DOI: 10.1109/ISSPA.1996.615179
J. Legg, D. Gray, A. Bolton
{"title":"A Sar Moving Target Ambiguity Function","authors":"J. Legg, D. Gray, A. Bolton","doi":"10.1109/ISSPA.1996.615179","DOIUrl":"https://doi.org/10.1109/ISSPA.1996.615179","url":null,"abstract":"The moving target ambiguity function of a ground mapping, airbome synthetic aperture radar is derived. It is shown that a nonuniform pulse repetition interval gives this radar the dual capability of full resolution ground imaging and unambiguous, two dimensional moving target velocity and position determination.","PeriodicalId":359344,"journal":{"name":"Fourth International Symposium on Signal Processing and Its Applications","volume":"17 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":"116800996","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
Object Recognition Using B-Spline Wavelets 基于b样条小波的目标识别
Fourth International Symposium on Signal Processing and Its Applications Pub Date : 1900-01-01 DOI: 10.1109/ISSPA.1996.615754
Q. Tieng, W. Boles
{"title":"Object Recognition Using B-Spline Wavelets","authors":"Q. Tieng, W. Boles","doi":"10.1109/ISSPA.1996.615754","DOIUrl":"https://doi.org/10.1109/ISSPA.1996.615754","url":null,"abstract":"An algorithm based on the dyadic B-Spline wavelet transform to recognise planar objects under a similarity transformation (translation, rotation and scaling) is presented. The algorithm consists of two stages: constructing the representation and the matching process. The representation is a set of curvature waveforms of an object contour viewed at different resolution levels. In the matching procedure, only extrema on the representation are used. This makes the process efficient and less sensitive to small variations on the representation. Experimental results show that the representation is robust and, combined with the matching algorithm, it efficiently classifies unknown objects.","PeriodicalId":359344,"journal":{"name":"Fourth International Symposium on Signal Processing and Its Applications","volume":"19 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":"123543687","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
Neural Circuit For Self-regulated Attentional Learning In Selective Attention Adaptive Resonance Theory (saart) Neural Networks 选择性注意自适应共振理论(saart)神经网络中自我调节注意学习的神经回路
Fourth International Symposium on Signal Processing and Its Applications Pub Date : 1900-01-01 DOI: 10.1109/ISSPA.1996.615096
P. Lozo
{"title":"Neural Circuit For Self-regulated Attentional Learning In Selective Attention Adaptive Resonance Theory (saart) Neural Networks","authors":"P. Lozo","doi":"10.1109/ISSPA.1996.615096","DOIUrl":"https://doi.org/10.1109/ISSPA.1996.615096","url":null,"abstract":"This paper presents a novel neural mechanism of self regulated attentional learning for real-time competitive neural networks that are also capable of selective attention. The neural circuit, currently aimed at SAART neural networks, detects whether the input is familiar or novel and then uses the generated signals to modulate synaptic signal transfer at various stages.","PeriodicalId":359344,"journal":{"name":"Fourth International Symposium on Signal Processing and Its Applications","volume":"30 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":"125478557","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
Fast And Accurate Computation Of The Discrete Cosine Transform Using TMS320C50 DSP 利用TMS320C50 DSP实现离散余弦变换的快速精确计算
Fourth International Symposium on Signal Processing and Its Applications Pub Date : 1900-01-01 DOI: 10.1109/ISSPA.1996.615133
J. Agbinya
{"title":"Fast And Accurate Computation Of The Discrete Cosine Transform Using TMS320C50 DSP","authors":"J. Agbinya","doi":"10.1109/ISSPA.1996.615133","DOIUrl":"https://doi.org/10.1109/ISSPA.1996.615133","url":null,"abstract":"In this paper a DCT algorithm is implemented which requires only 2N DCT coefficients i n the look-up table. Fixed-point methods are used, inputs are represented as 14-bit fixed-point numbers, and computation is done in double precision to increase accuracy. Results are presented as 16-bit values. My algorithm uses Clenshaw's recursive formula described in [3-51 to compute the DCT coefficients, {X(k)}, for the sequence {x(n)). I assume a series expansion of x(t) as N k=O x (t) = L h k F k (t) (3) where Fk(t) is a sequence chosen to obey the recursive relation:","PeriodicalId":359344,"journal":{"name":"Fourth International Symposium on Signal Processing and Its Applications","volume":"88 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":"122085627","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
Subband Coding of Images Using Predictive Vector Quantization 基于预测矢量量化的图像子带编码
Fourth International Symposium on Signal Processing and Its Applications Pub Date : 1900-01-01 DOI: 10.1109/ISSPA.1996.615694
K. Paliwal, F. Golchin
{"title":"Subband Coding of Images Using Predictive Vector Quantization","authors":"K. Paliwal, F. Golchin","doi":"10.1109/ISSPA.1996.615694","DOIUrl":"https://doi.org/10.1109/ISSPA.1996.615694","url":null,"abstract":"In this paper, two bfferent schemes for predictive vector quantization (VQ) of subband decomposed images are investigated. The aim is to reduce the quantization error by incorporating memory into the VQ scheme. The first scheme is a form of finite-state VQ FSVQ) which we will call subband FSVQ (SB-FSVQ) and the second is a form of predictive VQ (PVQ) applied to image subbands. We will refer to the second scheme as subband PVQ (SB-PVQ). It was found that both techniques outperform conventional subband VQ (memory-less) and spatial domain VQ in PSNR and perceptual tesms. It was also found that despite SB-FSVQ's ability to capture non-linear dependencies, SB-PVQ performs slightly better.","PeriodicalId":359344,"journal":{"name":"Fourth International Symposium on Signal Processing and Its Applications","volume":"12 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":"116735464","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
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