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Proceedings of the 1992 South African Symposium on Communications and Signal Processing最新文献

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An ISDN interface for the PC compatible 具有与PC机兼容的ISDN接口
Proceedings of the 1992 South African Symposium on Communications and Signal Processing Pub Date : 1992-09-11 DOI: 10.1109/COMSIG.1992.274311
C. Broderick, M. R. Inggs
{"title":"An ISDN interface for the PC compatible","authors":"C. Broderick, M. R. Inggs","doi":"10.1109/COMSIG.1992.274311","DOIUrl":"https://doi.org/10.1109/COMSIG.1992.274311","url":null,"abstract":"Low bit rate ISDN (2B+D) connections are becoming available especially within a PABX. An interface card is described that allows IBM/sup TM/ PC compatible computers to connect to the ISDN. The design is innovative in that the interface operates as a COMx port obeying the HAYES/sup TM/ command set, as a memory mapped interface for customized applications and finally as a voice interface for telephony. The HAYES/sup TM/ mode allows the user to take advantage of the host of communications based software on the market. The paper also discusses the integrated circuits chosen to support the complex hardware interfaces required by the ISDN standards.<<ETX>>","PeriodicalId":342857,"journal":{"name":"Proceedings of the 1992 South African Symposium on Communications and Signal Processing","volume":"95 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127228892","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
Subpixel accuracy in motion estimation for video coding 视频编码运动估计的亚像素精度
Proceedings of the 1992 South African Symposium on Communications and Signal Processing Pub Date : 1992-09-11 DOI: 10.1109/COMSIG.1992.274303
F. Bellifemine, M. Celidonio, A. Chimienti, G. Marcone, R. Picco
{"title":"Subpixel accuracy in motion estimation for video coding","authors":"F. Bellifemine, M. Celidonio, A. Chimienti, G. Marcone, R. Picco","doi":"10.1109/COMSIG.1992.274303","DOIUrl":"https://doi.org/10.1109/COMSIG.1992.274303","url":null,"abstract":"The aim is analysis of estimation accuracy for use in hybrid DCT coding schemes. The traditional block-matching algorithm has been generalized in order to take into account displacements of subpixel accuracy: 1, 1/2 and 1/4 pixel accuracies and different interpolation functions have been tested. The prediction error energy has been used to evaluate the performance of the estimation process. The problem has also been approached from the rate distortion theory point of view and the total performance tested considering also the increase in overheads for transmission of the motion vectors. An attempt to overcome the computational complexity of subpixel accuracies has been made. Results have been obtained by simulating a hybrid coder for constant quality coding.<<ETX>>","PeriodicalId":342857,"journal":{"name":"Proceedings of the 1992 South African Symposium on Communications and Signal Processing","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116947054","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
A fast box counting algorithm for determining the fractal dimension of sampled continuous functions 一种确定采样连续函数分形维数的快速盒计数算法
Proceedings of the 1992 South African Symposium on Communications and Signal Processing Pub Date : 1992-09-11 DOI: 10.1109/COMSIG.1992.274315
Henri Boshoff
{"title":"A fast box counting algorithm for determining the fractal dimension of sampled continuous functions","authors":"Henri Boshoff","doi":"10.1109/COMSIG.1992.274315","DOIUrl":"https://doi.org/10.1109/COMSIG.1992.274315","url":null,"abstract":"An adaptation of the box counting algorithm to samples of a continuous signal is given. An iterative scheme is combined with an exploitation of continuity to yield a fast method. This reduces the algorithm's complexity from quadratic to linear. The method is applied to speech segments; in this context it is faster than morphological filtering and Hurst analysis, and has comparable performance. The new algorithm is also suitable to be parallelized. It is applied to calculation of the dimension of fricative phonemes and automatic segmentation of speech into periodic/noiselike segments. This dimension value may be used instead of zero crossing rate in some applications.<<ETX>>","PeriodicalId":342857,"journal":{"name":"Proceedings of the 1992 South African Symposium on Communications and Signal Processing","volume":"124 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134551811","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: 10
Analysis of a half-rate invertible Type-II hybrid protocol for meteor burst communication 流星爆发通信的半速率可逆ii型混合协议分析
Proceedings of the 1992 South African Symposium on Communications and Signal Processing Pub Date : 1992-09-11 DOI: 10.1109/COMSIG.1992.274280
B. Whitby
{"title":"Analysis of a half-rate invertible Type-II hybrid protocol for meteor burst communication","authors":"B. Whitby","doi":"10.1109/COMSIG.1992.274280","DOIUrl":"https://doi.org/10.1109/COMSIG.1992.274280","url":null,"abstract":"The performance of a Type-II hybrid ARQ scheme code is analysed and evaluated. The Fritchman error model describes the channel error characteristics more accurately than current techniques which assume the channel to be binary symmetric. This equation forms the basis of the performance analysis of experimental Port Elizabeth-Salbu and Camperdown-Salbu MBC links.<<ETX>>","PeriodicalId":342857,"journal":{"name":"Proceedings of the 1992 South African Symposium on Communications and Signal Processing","volume":"137 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125239334","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 robust MSK demodulator through DSP 一种基于DSP的鲁棒MSK解调器
Proceedings of the 1992 South African Symposium on Communications and Signal Processing Pub Date : 1992-09-11 DOI: 10.1109/COMSIG.1992.274282
M.S. Hodgart, J. A. Schoonees
{"title":"A robust MSK demodulator through DSP","authors":"M.S. Hodgart, J. A. Schoonees","doi":"10.1109/COMSIG.1992.274282","DOIUrl":"https://doi.org/10.1109/COMSIG.1992.274282","url":null,"abstract":"A minimum shift keying or fast frequency shift keying coherent demodulating algorithm is discussed. Both carrier synchronisation and optimal symbol correlation are done within two decision switched Costas loops, each operating at one of the reference signal frequencies. Simulation shows the demodulator to be robust against phase distortion and frequency drift in the received signal. The receiver is relatively simple and well suited to a DSP or digital implementation.<<ETX>>","PeriodicalId":342857,"journal":{"name":"Proceedings of the 1992 South African Symposium on Communications and Signal Processing","volume":"86 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123572591","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
Novel loop structure enables a bit synchronizer to operate over multi-decade data rates 新颖的环路结构使位同步器能够在数十年的数据速率上运行
Proceedings of the 1992 South African Symposium on Communications and Signal Processing Pub Date : 1992-09-11 DOI: 10.1109/COMSIG.1992.274281
R. Braun
{"title":"Novel loop structure enables a bit synchronizer to operate over multi-decade data rates","authors":"R. Braun","doi":"10.1109/COMSIG.1992.274281","DOIUrl":"https://doi.org/10.1109/COMSIG.1992.274281","url":null,"abstract":"The extraction of a spectral component at the clock frequency is solved by means of an edge detector. The requirement for a constant Q in the bandpass filter is solved by a state variable filter controlled by two multiplying DACs. The phase locked loop is controlled by three multiplying DACs that enable a constant damping factor to be maintained whilst varying the natural frequency very widely.<<ETX>>","PeriodicalId":342857,"journal":{"name":"Proceedings of the 1992 South African Symposium on Communications and Signal Processing","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131601470","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
A versatile colour system capable of fruit sorting and accurate object classification 一个多功能的颜色系统，能够分类水果和准确的对象分类
Proceedings of the 1992 South African Symposium on Communications and Signal Processing Pub Date : 1992-09-11 DOI: 10.1109/COMSIG.1992.274296
G. Kay, G. de Jager
{"title":"A versatile colour system capable of fruit sorting and accurate object classification","authors":"G. Kay, G. de Jager","doi":"10.1109/COMSIG.1992.274296","DOIUrl":"https://doi.org/10.1109/COMSIG.1992.274296","url":null,"abstract":"A colour system that can be used for high speed colour classification of fruit in an automatic sorting environment is proposed. The hue, saturation, and intensity (HSI) colour system derived from the red, green, blue system can be represented in various forms. Specifically it is the 'hue' part of the colour system that makes the HSI system so versatile. It is shown that pixels containing the H-I features can be classified using cluster analysis. Supervised and unsupervised classification has applications in colour segmentation and area measurements.<<ETX>>","PeriodicalId":342857,"journal":{"name":"Proceedings of the 1992 South African Symposium on Communications and Signal Processing","volume":"137 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128668812","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: 16
Image coding through skeletonization 通过骨架化的图像编码
Proceedings of the 1992 South African Symposium on Communications and Signal Processing Pub Date : 1992-09-11 DOI: 10.1109/COMSIG.1992.274306
J. Kotzé, J.J.D. van Schalkwyk
{"title":"Image coding through skeletonization","authors":"J. Kotzé, J.J.D. van Schalkwyk","doi":"10.1109/COMSIG.1992.274306","DOIUrl":"https://doi.org/10.1109/COMSIG.1992.274306","url":null,"abstract":"A new technique for the compression of grey-level images is evaluated and slightly improved. The technique is based on the decomposition of an image into its bit-maps whereafter each bit-map is coded by representing it by its skeleton, a thinned version of the bitmap, which exactly describes its shape.<<ETX>>","PeriodicalId":342857,"journal":{"name":"Proceedings of the 1992 South African Symposium on Communications and Signal Processing","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122179621","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
A comparison of conventional, adaptive and hybrid Doppler processing techniques 传统、自适应和混合多普勒处理技术的比较
Proceedings of the 1992 South African Symposium on Communications and Signal Processing Pub Date : 1992-09-11 DOI: 10.1109/COMSIG.1992.274299
B. C. Armstrong
{"title":"A comparison of conventional, adaptive and hybrid Doppler processing techniques","authors":"B. C. Armstrong","doi":"10.1109/COMSIG.1992.274299","DOIUrl":"https://doi.org/10.1109/COMSIG.1992.274299","url":null,"abstract":"The relative performance of several well known Doppler processors is examined under a wide range of clutter conditions. Parameters are chosen to reflect land and sea clutter environments, including possible weather clutter components. Performance measures are discussed, with particular attention to filter-bank processing and M/N detection. The improvement factor of each processor and its loss relative to the optimal filter is evaluated in each clutter scenario. The insertion of MTI cancellers before LP or Hsaio filters for dealing with point clutter is discussed. Conventional AMTI and MTI filters are shown to provide dramatically inferior performance in many clutter environments.<<ETX>>","PeriodicalId":342857,"journal":{"name":"Proceedings of the 1992 South African Symposium on Communications and Signal Processing","volume":"236 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122359409","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
Characterization of digital channels using hidden Markov models 利用隐马尔可夫模型表征数字信道
Proceedings of the 1992 South African Symposium on Communications and Signal Processing Pub Date : 1992-09-11 DOI: 10.1109/COMSIG.1992.274287
J. Brummer
{"title":"Characterization of digital channels using hidden Markov models","authors":"J. Brummer","doi":"10.1109/COMSIG.1992.274287","DOIUrl":"https://doi.org/10.1109/COMSIG.1992.274287","url":null,"abstract":"To characterise the error process in binary symmetric channels with memory, the hidden Markov model allows more powerful modelling than the commonly used Fritchman models. Baum-Welch re-estimation is used to infer the model parameters from error sequences measured over the channel. This method is computationally very demanding for long error sequences, which are necessary when low BER channels are modelled. An efficient re-estimation has computational load directly proportional to the number of errors in the sequence rather than to its length. Channel simulation may be speeded-up similarly.<<ETX>>","PeriodicalId":342857,"journal":{"name":"Proceedings of the 1992 South African Symposium on Communications and Signal Processing","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132537935","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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