Pub Date : 1991-05-09DOI: 10.1109/PACRIM.1991.160800
S. Deng, U. Maydell, H. Hassanein
The ACR-NEMA standard (1985) allows different medical devices to communicate compatibly in a picture archiving and communication system (PACS) environment. The authors evaluate the performance of PACSs incorporating the ACR-NEMA standard. The ACR-NEMA standard requires that the ACR-NEMA bus be placed between any medical device and a network interface unit. The authors propose the removal of the ACR-NEMA bus from the archive-workstation path. Therefore, the ACR-NEMA protocol delays would be eliminated from all viewing requests. The ACR-NEMA bus is to be kept at the image generating equipment (IGE) workstations. The authors introduce the enhanced PACS architecture. Some numerical results of the architecture are shown and compared to results obtained by following the ACR-NEMA bus placement specification as stated in the standard.
{"title":"On placement of the ACR-NEMA bus in picture archiving and communications systems","authors":"S. Deng, U. Maydell, H. Hassanein","doi":"10.1109/PACRIM.1991.160800","DOIUrl":"https://doi.org/10.1109/PACRIM.1991.160800","url":null,"abstract":"The ACR-NEMA standard (1985) allows different medical devices to communicate compatibly in a picture archiving and communication system (PACS) environment. The authors evaluate the performance of PACSs incorporating the ACR-NEMA standard. The ACR-NEMA standard requires that the ACR-NEMA bus be placed between any medical device and a network interface unit. The authors propose the removal of the ACR-NEMA bus from the archive-workstation path. Therefore, the ACR-NEMA protocol delays would be eliminated from all viewing requests. The ACR-NEMA bus is to be kept at the image generating equipment (IGE) workstations. The authors introduce the enhanced PACS architecture. Some numerical results of the architecture are shown and compared to results obtained by following the ACR-NEMA bus placement specification as stated in the standard.","PeriodicalId":289986,"journal":{"name":"[1991] IEEE Pacific Rim Conference on Communications, Computers and Signal Processing Conference Proceedings","volume":"88 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116384335","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}
Pub Date : 1991-05-09DOI: 10.1109/PACRIM.1991.160868
S. A. Altekar, N. Beaulieu
The authors derive some upper bounds to the error probability of decision feedback equalization (DFE). The bounds are valid for the same conditions as the bounds of D.L. Duttweiler et al. (1974). The bounds are as much as 2.8 dB tighter in signal-to-noise ratio (SNR) than those of Duttweiler for certain channels. An upper bound based on considering distinct single error states is derived. A second bound based on examining distinct single and distinct double consecutive error states is presented. Worthwhile improvement over the second bound is obtained by adding all distinct double error states to the reduced state model. Triple consecutive error state bounds are considered, and a revised comparison of DFE with linear equalization is made using the tighter bounds.<>
{"title":"Tight upper bounds to the error probability of decision feedback equalization","authors":"S. A. Altekar, N. Beaulieu","doi":"10.1109/PACRIM.1991.160868","DOIUrl":"https://doi.org/10.1109/PACRIM.1991.160868","url":null,"abstract":"The authors derive some upper bounds to the error probability of decision feedback equalization (DFE). The bounds are valid for the same conditions as the bounds of D.L. Duttweiler et al. (1974). The bounds are as much as 2.8 dB tighter in signal-to-noise ratio (SNR) than those of Duttweiler for certain channels. An upper bound based on considering distinct single error states is derived. A second bound based on examining distinct single and distinct double consecutive error states is presented. Worthwhile improvement over the second bound is obtained by adding all distinct double error states to the reduced state model. Triple consecutive error state bounds are considered, and a revised comparison of DFE with linear equalization is made using the tighter bounds.<<ETX>>","PeriodicalId":289986,"journal":{"name":"[1991] IEEE Pacific Rim Conference on Communications, Computers and Signal Processing Conference Proceedings","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126733208","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}
Pub Date : 1991-05-09DOI: 10.1109/PACRIM.1991.160748
A. T. Schneider, J. Hanson
Dynamic range controllers (DRCs) find wide application in the recording and reproduction of audio signals. With the advent of powerful, low-cost digital signal processing hardware, the potential for creating low-cost digital dynamic range controllers (DDRCs) has increased. Previous DDRC designs used expensive custom hardware and were typically reimplementations of traditional architectures. A description is presented of the design and real-time implementation of a single-channel DDRC. The design uses adaptive recovery and signal measurement to improve performance.<>
{"title":"An adaptive dynamic range controller for digital audio","authors":"A. T. Schneider, J. Hanson","doi":"10.1109/PACRIM.1991.160748","DOIUrl":"https://doi.org/10.1109/PACRIM.1991.160748","url":null,"abstract":"Dynamic range controllers (DRCs) find wide application in the recording and reproduction of audio signals. With the advent of powerful, low-cost digital signal processing hardware, the potential for creating low-cost digital dynamic range controllers (DDRCs) has increased. Previous DDRC designs used expensive custom hardware and were typically reimplementations of traditional architectures. A description is presented of the design and real-time implementation of a single-channel DDRC. The design uses adaptive recovery and signal measurement to improve performance.<<ETX>>","PeriodicalId":289986,"journal":{"name":"[1991] IEEE Pacific Rim Conference on Communications, Computers and Signal Processing Conference Proceedings","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129159405","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}
Pub Date : 1991-05-09DOI: 10.1109/PACRIM.1991.160835
Z. Ulman, M. Czyzak, J. Zurada
A residue division technique is presented. The technique is based on the use of a number system termed the radix-based residue number system (RNS) and, associated with it, the homogeneous mixed-radix number system (HMRS). The quotient is obtained as the sum of the rounded partial quotients of the HMRS weights and the divisor. The division is fast, noniterative, and implementable in a parallel look-up table based architecture. Contrary to binary division by right shifting, the division time is fixed and independent of the divisor value.<>
{"title":"Fast division in residue arithmetic","authors":"Z. Ulman, M. Czyzak, J. Zurada","doi":"10.1109/PACRIM.1991.160835","DOIUrl":"https://doi.org/10.1109/PACRIM.1991.160835","url":null,"abstract":"A residue division technique is presented. The technique is based on the use of a number system termed the radix-based residue number system (RNS) and, associated with it, the homogeneous mixed-radix number system (HMRS). The quotient is obtained as the sum of the rounded partial quotients of the HMRS weights and the divisor. The division is fast, noniterative, and implementable in a parallel look-up table based architecture. Contrary to binary division by right shifting, the division time is fixed and independent of the divisor value.<<ETX>>","PeriodicalId":289986,"journal":{"name":"[1991] IEEE Pacific Rim Conference on Communications, Computers and Signal Processing Conference Proceedings","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129026055","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}
Pub Date : 1991-05-09DOI: 10.1109/PACRIM.1991.160724
C. X. Tan, Y.L. Ma
It is shown that for a slowly rotating sensor array accurate direction finding can still be achieved if the power method together with a rotation correction scheme is applied. The bearing estimation error curves along with input SNR, correlation of the ambient noise field, and incident direction of the source are also given. It also can be used for moving target tracking.<>
{"title":"Rapid direction finding for principal source with applications to underwater sound","authors":"C. X. Tan, Y.L. Ma","doi":"10.1109/PACRIM.1991.160724","DOIUrl":"https://doi.org/10.1109/PACRIM.1991.160724","url":null,"abstract":"It is shown that for a slowly rotating sensor array accurate direction finding can still be achieved if the power method together with a rotation correction scheme is applied. The bearing estimation error curves along with input SNR, correlation of the ambient noise field, and incident direction of the source are also given. It also can be used for moving target tracking.<<ETX>>","PeriodicalId":289986,"journal":{"name":"[1991] IEEE Pacific Rim Conference on Communications, Computers and Signal Processing Conference Proceedings","volume":"104 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132904232","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}
Pub Date : 1991-05-09DOI: 10.1109/PACRIM.1991.160755
T. Calvert, J. Dickinson, J. Dill, W. Havens, J. Jones, L. Bartram
A description is presented of the first steps towards an intelligent CAD system based on a mixed-initiative approach. The expert system is an object-oriented model-based reasoning engine using constraint propagation and dependency backtracking. The architecture is built around the expert system, a CAD engine, and a user interface/controller module mediating the mixed-initiative relationship between designer and system. Initial experience has shown the need to model both experts and objects in the knowledge base and both the need and difficulty of representing design and constraint spaces to the designer. The preliminary results of a study of how people use a CAD system to better understand the design process itself suggest directions for the development of intelligent CAD.<>
{"title":"An intelligent basis for design","authors":"T. Calvert, J. Dickinson, J. Dill, W. Havens, J. Jones, L. Bartram","doi":"10.1109/PACRIM.1991.160755","DOIUrl":"https://doi.org/10.1109/PACRIM.1991.160755","url":null,"abstract":"A description is presented of the first steps towards an intelligent CAD system based on a mixed-initiative approach. The expert system is an object-oriented model-based reasoning engine using constraint propagation and dependency backtracking. The architecture is built around the expert system, a CAD engine, and a user interface/controller module mediating the mixed-initiative relationship between designer and system. Initial experience has shown the need to model both experts and objects in the knowledge base and both the need and difficulty of representing design and constraint spaces to the designer. The preliminary results of a study of how people use a CAD system to better understand the design process itself suggest directions for the development of intelligent CAD.<<ETX>>","PeriodicalId":289986,"journal":{"name":"[1991] IEEE Pacific Rim Conference on Communications, Computers and Signal Processing Conference Proceedings","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127185711","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}
Pub Date : 1991-05-09DOI: 10.1109/PACRIM.1991.160828
M. A. Hasan, J. Lee, V. Bhargava
In the presence of strong jamming signals, the use of interference cancellers with spread-spectrum modulation has proved to be effective in providing a sufficient degree of interference rejection capability in data transmission systems. An adaptive interference canceller with an adjustable center weight is proposed to improve the performance of the conventional canceller. The input signal of the canceller is assumed to consist of the data, interference, and additive white Gaussian noise. The results obtained can readily be applied to data transmission systems such as normal binary phase shift keying (BPSK) and direct-sequence spread-spectrum BPSK modems. The performance of the interference canceller is shown to be better than the conventional canceller by analysis and computer simulations.<>
{"title":"Performance of a narrowband interference canceller with an adjustable center weight","authors":"M. A. Hasan, J. Lee, V. Bhargava","doi":"10.1109/PACRIM.1991.160828","DOIUrl":"https://doi.org/10.1109/PACRIM.1991.160828","url":null,"abstract":"In the presence of strong jamming signals, the use of interference cancellers with spread-spectrum modulation has proved to be effective in providing a sufficient degree of interference rejection capability in data transmission systems. An adaptive interference canceller with an adjustable center weight is proposed to improve the performance of the conventional canceller. The input signal of the canceller is assumed to consist of the data, interference, and additive white Gaussian noise. The results obtained can readily be applied to data transmission systems such as normal binary phase shift keying (BPSK) and direct-sequence spread-spectrum BPSK modems. The performance of the interference canceller is shown to be better than the conventional canceller by analysis and computer simulations.<<ETX>>","PeriodicalId":289986,"journal":{"name":"[1991] IEEE Pacific Rim Conference on Communications, Computers and Signal Processing Conference Proceedings","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131201379","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}
Pub Date : 1991-05-09DOI: 10.1109/PACRIM.1991.160822
H. Baher
A technique for the design of wave digital bandpass filters with amplitude selectivity and phase linearity in a significant portion of the passband is presented. The technique is a nontrivial extension of the lowpass design given by H. Baher et al. (1990). The author considers a design of a sixth-order wave digital bandpass filter as an example. The amplitude and delay responses of the filter are given.<>
{"title":"Design of wave digital bandpass filters with simultaneous approximation to the ideal delay and amplitude characteristics","authors":"H. Baher","doi":"10.1109/PACRIM.1991.160822","DOIUrl":"https://doi.org/10.1109/PACRIM.1991.160822","url":null,"abstract":"A technique for the design of wave digital bandpass filters with amplitude selectivity and phase linearity in a significant portion of the passband is presented. The technique is a nontrivial extension of the lowpass design given by H. Baher et al. (1990). The author considers a design of a sixth-order wave digital bandpass filter as an example. The amplitude and delay responses of the filter are given.<<ETX>>","PeriodicalId":289986,"journal":{"name":"[1991] IEEE Pacific Rim Conference on Communications, Computers and Signal Processing Conference Proceedings","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131232469","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}
Pub Date : 1991-05-09DOI: 10.1109/PACRIM.1991.160806
N. Parthasarathy, M. Ahmadi, M. Shridhar
A system with a complex data structure which provides for diagnosis of multiple disorders of the heart is introduced. In the proposed data structure, a tree is used to represent a waveform. The normal and abnormal electrocardiogram (ECG) waveforms are represented by a tree structure. The degree of mismatch between the two trees in terms of node splitting and merging operations are calculated. The three distances which are a measure of the structural deformation of the waveforms form the background medical information required for diagnosis. A key characteristic of the system is the congenial man-machine interface. The system is capable of explaining to the user the reasoning process for its diagnosis. The model is independent, thereby allowing expansions to include disorders from other disciplines.<>
{"title":"Pattern based ECG diagnosis","authors":"N. Parthasarathy, M. Ahmadi, M. Shridhar","doi":"10.1109/PACRIM.1991.160806","DOIUrl":"https://doi.org/10.1109/PACRIM.1991.160806","url":null,"abstract":"A system with a complex data structure which provides for diagnosis of multiple disorders of the heart is introduced. In the proposed data structure, a tree is used to represent a waveform. The normal and abnormal electrocardiogram (ECG) waveforms are represented by a tree structure. The degree of mismatch between the two trees in terms of node splitting and merging operations are calculated. The three distances which are a measure of the structural deformation of the waveforms form the background medical information required for diagnosis. A key characteristic of the system is the congenial man-machine interface. The system is capable of explaining to the user the reasoning process for its diagnosis. The model is independent, thereby allowing expansions to include disorders from other disciplines.<<ETX>>","PeriodicalId":289986,"journal":{"name":"[1991] IEEE Pacific Rim Conference on Communications, Computers and Signal Processing Conference Proceedings","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131425455","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}
Pub Date : 1991-05-09DOI: 10.1109/PACRIM.1991.160716
M. Y. Cheung, W. Grover, W. Krzymień
A combined framing and error control scheme is proposed for the DS3 signal by replacing the F-bits with FEC parity check bits. A suitable extended and shortened Hamming code is used. A fast syndrome computation scheme is developed for the DS3-FEC code with distributed parity check bits to facilitate faster reframe times. The proposed scheme has a better overall framing performance than that of F-bit framing. It also offers the output BER reduction to approximately 1360 P/sub e//sup 2/.<>
{"title":"Combined framing and FEC coding for digital multiplex signals","authors":"M. Y. Cheung, W. Grover, W. Krzymień","doi":"10.1109/PACRIM.1991.160716","DOIUrl":"https://doi.org/10.1109/PACRIM.1991.160716","url":null,"abstract":"A combined framing and error control scheme is proposed for the DS3 signal by replacing the F-bits with FEC parity check bits. A suitable extended and shortened Hamming code is used. A fast syndrome computation scheme is developed for the DS3-FEC code with distributed parity check bits to facilitate faster reframe times. The proposed scheme has a better overall framing performance than that of F-bit framing. It also offers the output BER reduction to approximately 1360 P/sub e//sup 2/.<<ETX>>","PeriodicalId":289986,"journal":{"name":"[1991] IEEE Pacific Rim Conference on Communications, Computers and Signal Processing Conference Proceedings","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131518767","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}
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