发布求助
文献互助 智能选刊 最新文献

Conference Proceeding IEEE Pacific Rim Conference on Communications, Computers and Signal Processing最新文献

筛选
英文 中文
Linear phase IIR filter design: a model reduction approach 线性相位IIR滤波器设计:模型简化方法
Conference Proceeding IEEE Pacific Rim Conference on Communications, Computers and Signal Processing Pub Date : 1989-06-01 DOI: 10.1109/PACRIM.1989.48334
V. Sreeram, P. Agathoklis
{"title":"Linear phase IIR filter design: a model reduction approach","authors":"V. Sreeram, P. Agathoklis","doi":"10.1109/PACRIM.1989.48334","DOIUrl":"https://doi.org/10.1109/PACRIM.1989.48334","url":null,"abstract":"A method is presented for the design of a linear-phase IIR filter. It involves designing a FIR filter satisfying the given frequency response specifications and subsequently obtaining a significantly lower-order IIR filter using model reduction. The method is illustrated by a design example and is compared with a direct method for the design of linear-phase IIR filters using equalizers. The filter designed using the proposed technique gives a better constant group delay for an almost equal order.<<ETX>>","PeriodicalId":256287,"journal":{"name":"Conference Proceeding IEEE Pacific Rim Conference on Communications, Computers and Signal Processing","volume":"171 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122975423","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
Blocking in an ISDN ring ISDN环中的阻塞
Conference Proceeding IEEE Pacific Rim Conference on Communications, Computers and Signal Processing Pub Date : 1989-06-01 DOI: 10.1109/PACRIM.1989.48321
G. Stamatelos, J. Hayes
{"title":"Blocking in an ISDN ring","authors":"G. Stamatelos, J. Hayes","doi":"10.1109/PACRIM.1989.48321","DOIUrl":"https://doi.org/10.1109/PACRIM.1989.48321","url":null,"abstract":"Results are presented of an exact analysis of the blocking conditions in a N nodes ring accessed by different classes of traffic. Blocking of a call request occurs when the number of slots required for the message transmission is not available on one (or more) of the tandem links that it traverses. The complexity of the technique proposed for the computation of the q(.) function increases exponentially with the number of nodes in the system. An approximation, therefore, may be required for the analysis of larger systems. The validity of the present work is not limited by this observation.<<ETX>>","PeriodicalId":256287,"journal":{"name":"Conference Proceeding IEEE Pacific Rim Conference on Communications, Computers and Signal Processing","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115790591","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
Frequency estimation and propagation loss for relative source/receiver motion in an oceanic waveguide 海洋波导中源/接收机相对运动的频率估计和传播损耗
Conference Proceeding IEEE Pacific Rim Conference on Communications, Computers and Signal Processing Pub Date : 1989-06-01 DOI: 10.1109/PACRIM.1989.48425
J. Fawcett
{"title":"Frequency estimation and propagation loss for relative source/receiver motion in an oceanic waveguide","authors":"J. Fawcett","doi":"10.1109/PACRIM.1989.48425","DOIUrl":"https://doi.org/10.1109/PACRIM.1989.48425","url":null,"abstract":"The effects of source and receiver motion on sound propagation in an oceanic waveguide are investigated. An explicit expression is given for the discrete Fourier transform of a harmonic signal emitted by a moving source in terms of the source and receiver velocities and the modes of the waveguide. This expression is shown to be very accurate and is used to investigate the variation of frequency observations as a function of range, dynamical, and signal-processing parameters. A realistic Northeast Pacific scenario is used in the numerical computations. The effect of source motion on propagation loss between the source and a receiver is examined.<<ETX>>","PeriodicalId":256287,"journal":{"name":"Conference Proceeding IEEE Pacific Rim Conference on Communications, Computers and Signal Processing","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115469949","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 data flow processor for edge tracing stored binary images 一种用于边缘跟踪存储二值图像的数据流处理器
Conference Proceeding IEEE Pacific Rim Conference on Communications, Computers and Signal Processing Pub Date : 1989-06-01 DOI: 10.1109/PACRIM.1989.48445
R. Tervo, R. Ding-Au
{"title":"A data flow processor for edge tracing stored binary images","authors":"R. Tervo, R. Ding-Au","doi":"10.1109/PACRIM.1989.48445","DOIUrl":"https://doi.org/10.1109/PACRIM.1989.48445","url":null,"abstract":"A data flow processor is described which can autonomously trace the perimeter of a stored binary image. Based on a unique reconfigurable two-dimensional memory, the prototype circuit demonstrates the power of in-memory processing in applications including object recognition, data reduction, connectivity analysis, and automatic inspection. In this application, the edges of stored binary objects are identified and traced autonomously, with no intervention from the host computer.<<ETX>>","PeriodicalId":256287,"journal":{"name":"Conference Proceeding IEEE Pacific Rim Conference on Communications, Computers and Signal Processing","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123662152","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
Using gradient orientation for edgel detection 利用梯度定向进行边缘检测
Conference Proceeding IEEE Pacific Rim Conference on Communications, Computers and Signal Processing Pub Date : 1989-06-01 DOI: 10.1109/PACRIM.1989.48361
P. Gregson
{"title":"Using gradient orientation for edgel detection","authors":"P. Gregson","doi":"10.1109/PACRIM.1989.48361","DOIUrl":"https://doi.org/10.1109/PACRIM.1989.48361","url":null,"abstract":"Selection of suitable thresholds for edgel detection is discussed. An analysis of the variation in gradient direction is performed to estimate the probability density function of gradient direction as a function of image signal-to-noise ratio. A direction band about the mean of the PDF is determined on the basis of the minimum acceptable fraction of the cumulative neighborhood gradient magnitudes due to those gradients which have directions within the band. The proposed algorithm thus bases edgel detection on the distribution of local gradient direction rather than merely the magnitude response. Corners and small-radius curves are accommodated by permitting multiple histogram peaks with attendant reduction in both the minimum cumulative response fraction required and the direction bandwidth.<<ETX>>","PeriodicalId":256287,"journal":{"name":"Conference Proceeding IEEE Pacific Rim Conference on Communications, Computers and Signal Processing","volume":"140 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122148304","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
Direct sequence spread-spectrum multiple access system performance in an indoor milieu characterized by a Rician channel 直接序列扩频多址系统在室内环境下的性能
Conference Proceeding IEEE Pacific Rim Conference on Communications, Computers and Signal Processing Pub Date : 1989-06-01 DOI: 10.1109/PACRIM.1989.48318
E.C. Lim, P. Galko
{"title":"Direct sequence spread-spectrum multiple access system performance in an indoor milieu characterized by a Rician channel","authors":"E.C. Lim, P. Galko","doi":"10.1109/PACRIM.1989.48318","DOIUrl":"https://doi.org/10.1109/PACRIM.1989.48318","url":null,"abstract":"The performance of a direct-sequence spread-spectrum multiple-access (DS/SS-MA) system operating in an indoor milieu characterized by a Rician fading multipath channel is evaluated. The system uses selection diversity and differential phase shift keying as the modulation. The performance of the system is presented for Rician channels with parameters derived from reported actual channel measurements at data rates of 32, 64, and 144 kb/s. It is found that the performance of these systems can be enhanced by exploiting the frequency diversity characteristic inherent in DS/SS signals. It is shown that the improvement in system performance is greatest when space diversity reception operates in tandem with DS/SS modulation.<<ETX>>","PeriodicalId":256287,"journal":{"name":"Conference Proceeding IEEE Pacific Rim Conference on Communications, Computers and Signal Processing","volume":"60 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123912646","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
High quality audio encoding within 128 kbit/s 128 kbit/s以内的高质量音频编码
Conference Proceeding IEEE Pacific Rim Conference on Communications, Computers and Signal Processing Pub Date : 1989-06-01 DOI: 10.1109/PACRIM.1989.48383
R. J. Beaton
{"title":"High quality audio encoding within 128 kbit/s","authors":"R. J. Beaton","doi":"10.1109/PACRIM.1989.48383","DOIUrl":"https://doi.org/10.1109/PACRIM.1989.48383","url":null,"abstract":"An algorithm to encode 15-KHz bandwidth audio at 128 kb/s has been developed which has important applications in ISDN, digital audio recording, and the broadcasting industry. The algorithm uses subband ADPCM coding combined with adaptive bit allocation over multiple subbands to achieve high audio quality at a net data rate of 4 b per sample. Subband coders are generally found to perform better than the equivalent full-band coder in subjective tests, even though the full-band coder may achieve a higher SNR rating. This is due to perceptual masking effects which cause the band-limited quantization noise below a certain threshold in each subband to be masked by the signal. Dynamic allocation of bits to subbands on a sample-by-sample basis, together with a simple multiplexing strategy, eliminates the need for side information and makes the algorithm robust in the presence of network bit errors.<<ETX>>","PeriodicalId":256287,"journal":{"name":"Conference Proceeding IEEE Pacific Rim Conference on Communications, Computers and Signal Processing","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129517953","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
Simulation of error sequences in a mobile communications channel with Fritchman's error generation model 用Fritchman误差生成模型模拟移动通信信道中的误差序列
Conference Proceeding IEEE Pacific Rim Conference on Communications, Computers and Signal Processing Pub Date : 1989-06-01 DOI: 10.1109/PACRIM.1989.48323
J. Chouinard, M. Lecours, G. Delisle
{"title":"Simulation of error sequences in a mobile communications channel with Fritchman's error generation model","authors":"J. Chouinard, M. Lecours, G. Delisle","doi":"10.1109/PACRIM.1989.48323","DOIUrl":"https://doi.org/10.1109/PACRIM.1989.48323","url":null,"abstract":"A digital mobile radio channel simulator is presented. It is based on Fritchman's model (1967) with the parameter values as estimated using the gradient approximation technique. Fritchman's error generation model can be simulated by setting the simulator's parameters to the computed values; realistic error sequences can thus be generated. The implementation of the error sequences generator is straightforward and can be used to evaluate the performances of error correction and detection strategies for digital communication channels corrupted by error bursts.<<ETX>>","PeriodicalId":256287,"journal":{"name":"Conference Proceeding IEEE Pacific Rim Conference on Communications, Computers and Signal Processing","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121963606","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
An IF carrier recovery loop using decision feedback for a 16-QAM demodulator 一种用于16-QAM解调器的中频载波恢复环路
Conference Proceeding IEEE Pacific Rim Conference on Communications, Computers and Signal Processing Pub Date : 1989-06-01 DOI: 10.1109/PACRIM.1989.48376
R.H.E. Gulikers, A. P. Verlijsdonk, G. Janssen
{"title":"An IF carrier recovery loop using decision feedback for a 16-QAM demodulator","authors":"R.H.E. Gulikers, A. P. Verlijsdonk, G. Janssen","doi":"10.1109/PACRIM.1989.48376","DOIUrl":"https://doi.org/10.1109/PACRIM.1989.48376","url":null,"abstract":"A carrier recovery loop based upon decision-directed IF remodulation techniques is presented. The 16-QAM signal is converted into a 3-ary ASK signal containing a discrete carrier component, which can be tracked by a phase-locked loop. The symbol timing recovery is accomplished by a coherent early-late tracking loop, which uses decision feedback as well. Thus, the carrier recovery, the symbol timing recovery, and the data detection are strongly interrelated processes, each being of vital importance for the correct demodulation of the received 16-QAM signal.<<ETX>>","PeriodicalId":256287,"journal":{"name":"Conference Proceeding IEEE Pacific Rim Conference on Communications, Computers and Signal Processing","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116028816","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
Development of a demisyllable-based speech synthesis system 基于半音节的语音合成系统的开发
Conference Proceeding IEEE Pacific Rim Conference on Communications, Computers and Signal Processing Pub Date : 1989-06-01 DOI: 10.1109/PACRIM.1989.48402
S. Eady, T. Hemphill, J. Woolsey, J. Clayards
{"title":"Development of a demisyllable-based speech synthesis system","authors":"S. Eady, T. Hemphill, J. Woolsey, J. Clayards","doi":"10.1109/PACRIM.1989.48402","DOIUrl":"https://doi.org/10.1109/PACRIM.1989.48402","url":null,"abstract":"The development of a microcomputer-based voice output system for English that uses prerecorded demisyllables as units of synthesis is described. With an inventory of approximately 950 demisyllables, the system is capable of producing all possible syllables and words of English. By combining these units to form continuous speech, the system can produce any English sentence.<<ETX>>","PeriodicalId":256287,"journal":{"name":"Conference Proceeding IEEE Pacific Rim Conference on Communications, Computers and Signal Processing","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125461040","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
首页 上一页 下一页 尾页
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整，为了账户安全，请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
请完成安全验证×
相关产品
×
本文献相关产品
联系我们：info@booksci.cn Book学术提供免费学术资源搜索服务，方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号：481959085
Book学术官方微信