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IEEE Transactions on Communication Technology最新文献

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Directional Correlation - A Technique to Reduce Bandwidth in PCM Television Transmissions 方向相关——一种在PCM电视传输中减少带宽的技术
IEEE Transactions on Communication Technology Pub Date : 1967-04-01 DOI: 10.1109/TCOM.1967.1089578
F. Manasse
{"title":"Directional Correlation - A Technique to Reduce Bandwidth in PCM Television Transmissions","authors":"F. Manasse","doi":"10.1109/TCOM.1967.1089578","DOIUrl":"https://doi.org/10.1109/TCOM.1967.1089578","url":null,"abstract":"Utilizing the new tool of frame storage of PCM encoded television pictures, a new technique for reducing the bandwidth requirements for transmission is described. The method involves the use of the high directional correlation inherent in picture point samples of the same frame, as well as frame to frame correlation. Using the procedures developed in the paper, a block diagram of a transmitter and receiver utilizing such a principle is illustrated and discussed. It is also shown how this technique improves on that of both simple and modified differential PCM encoding for television transmission.","PeriodicalId":134522,"journal":{"name":"IEEE Transactions on Communication Technology","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1967-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124471842","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
Crosspoint system in telex exchanges 电传交换机的交叉点系统
IEEE Transactions on Communication Technology Pub Date : 1967-04-01 DOI: 10.1109/TCOM.1967.1089566
H. Dobermann
{"title":"Crosspoint system in telex exchanges","authors":"H. Dobermann","doi":"10.1109/TCOM.1967.1089566","DOIUrl":"https://doi.org/10.1109/TCOM.1967.1089566","url":null,"abstract":"Low space requirements, ease of installation, highswitching speed, nominal maintenance requirements, and highly automated production are demands imposed on modem exchanges. The crosspoint system developed by Siemens AG has been specially designed to meet these requirements. Since most teleprinter exchanges are rated for a capacity of less than 100 subscribers, the first embodiment of the system principle is a subdistrict exchange catering to 50 subscribers and permitting expansion for a total of 400 subscribers. One version of district exchange intended for major switching applications is engineered as a transit exchange with trunk lines only.","PeriodicalId":134522,"journal":{"name":"IEEE Transactions on Communication Technology","volume":"28 Suppl 1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1967-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116902925","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
Frequency Spread in Ionospheric Radio Propagation 电离层无线电传播中的频率扩展
IEEE Transactions on Communication Technology Pub Date : 1967-04-01 DOI: 10.1109/TCOM.1967.1089568
R. Shepherd, J. Lomax
{"title":"Frequency Spread in Ionospheric Radio Propagation","authors":"R. Shepherd, J. Lomax","doi":"10.1109/TCOM.1967.1089568","DOIUrl":"https://doi.org/10.1109/TCOM.1967.1089568","url":null,"abstract":"As part of a research program on the time- and frequency-dispersive characteristics of ionospheric radio propagation, techniques were developed for precise measurement of the power spectrum of a received CW signal. Frequency resolution of 0.025 Hz is obtained. This resolution allows the observation of the various propagating modes and, with the aid of oblique-incidence ionograms taken simultaneously, identification of the modes. Occasionally, even the ordinary and extraordinary components of the wave can be separated and identified. Power spectra were derived from measurements made on a midlatitude path and on a transauroral path over a period of one year near the solar cycle minimum. In addition to the plotting of the power spectra, the root-mean-square widths of the spectra (defined as the frequency spread) and the means (or average Doppler shift) were computed. Distributions of these data are presented, and the frequency spread is compared with the magnetic activity, the timedelay spread, and the number of modes.","PeriodicalId":134522,"journal":{"name":"IEEE Transactions on Communication Technology","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1967-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114077276","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: 44
Performance of Suboptimum Feedback Functions for Sequential Detection Systems with Feedback 带反馈的序列检测系统次优反馈函数的性能
IEEE Transactions on Communication Technology Pub Date : 1967-04-01 DOI: 10.1109/TCOM.1967.1089551
S. Sugimoto
{"title":"Performance of Suboptimum Feedback Functions for Sequential Detection Systems with Feedback","authors":"S. Sugimoto","doi":"10.1109/TCOM.1967.1089551","DOIUrl":"https://doi.org/10.1109/TCOM.1967.1089551","url":null,"abstract":"The performances of the optimum and several suboptimum feedback functions for sequential binary communication systems with a feedback link are evaluated and compared in terms of the error probability vs. normalized transmission rate characteristic. Evaluation is also made of nonsequential systems with optimum feedback functions. It is shown that the power advantage attained by the optimum system can be achieved without considerable loss by the suboptimum feedback functions.","PeriodicalId":134522,"journal":{"name":"IEEE Transactions on Communication Technology","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1967-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121804153","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
Orthogonal Tree Codes for Communication in the Presence of White Gaussian Noise 高斯白噪声下的正交树通信编码
IEEE Transactions on Communication Technology Pub Date : 1967-04-01 DOI: 10.1109/TCOM.1967.1089561
A. Viterbi
{"title":"Orthogonal Tree Codes for Communication in the Presence of White Gaussian Noise","authors":"A. Viterbi","doi":"10.1109/TCOM.1967.1089561","DOIUrl":"https://doi.org/10.1109/TCOM.1967.1089561","url":null,"abstract":"This paper describes a convolutional encoder for generating tree codes whose distinct codewords are orthogonal over the constraint length of the code. The performance of this class of codes is analyzed and the error probability is shown to decrease exponentially with the energy-to-noise ratio over the constraint length period of the code. The performance is compared with wellknown results for orthogonal block codes and shown to be considerably superior to the latter. Asymptotic results are also obtained which coincide with results for the class of very noisy memoryless channels.","PeriodicalId":134522,"journal":{"name":"IEEE Transactions on Communication Technology","volume":"66 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1967-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127587464","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: 47
Engineering Aspects of Office Balance 办公室平衡的工程方面
IEEE Transactions on Communication Technology Pub Date : 1967-04-01 DOI: 10.1109/TCOM.1967.1089570
R. Schindler
{"title":"Engineering Aspects of Office Balance","authors":"R. Schindler","doi":"10.1109/TCOM.1967.1089570","DOIUrl":"https://doi.org/10.1109/TCOM.1967.1089570","url":null,"abstract":"Office balance, as applied to the toll telephone network, can be divided into two major divisions, those of through and terminal balance. Through balance concerns the connection of one 4-wire intertoll trunk with another, switched on a 2-wire basis. Terminal balance is required for the interconnection of an intertoll trunk with a toll connecting trunk to the subscriber's central office. Because of the extent of private networks presently being engineered, it is necessary to balance the interconnection of calls within these networks. This paper is concerned with the basic principles of through and terminal balance, but primarily centers on terminal balance in the private and DDD networks, because that is the area of the majority of engineering problems.","PeriodicalId":134522,"journal":{"name":"IEEE Transactions on Communication Technology","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1967-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133321764","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
APC Systems Used in Broadband Carrier Systems for Video Signal Transmission APC系统在宽带载波系统中用于视频信号传输
IEEE Transactions on Communication Technology Pub Date : 1967-04-01 DOI: 10.1109/TCOM.1967.1089579
M. Kawashima, T. Higeta, K. Endo, G. Yazaki
{"title":"APC Systems Used in Broadband Carrier Systems for Video Signal Transmission","authors":"M. Kawashima, T. Higeta, K. Endo, G. Yazaki","doi":"10.1109/TCOM.1967.1089579","DOIUrl":"https://doi.org/10.1109/TCOM.1967.1089579","url":null,"abstract":"From the viewpoint of better utilization of synchronization information in suppressed carrier VSB (vestigial sideband) television signals, various carrier regeneration and phase tracking systems are examined. Two APC (automatic phase control) systems with improved utilization of synchronous information are discussed further with emphasis placed on their precision phase tracking and carrier regeneration characteristics. Test models of both systems have obtained a carrier phase accuracy of ± 0.5 degree, which permits color television transmission over a chain of long haul links. Practical utilization of the first system, which employs an approximateBSB(both sidebands) component is featured by the use of a variable parameter phase tracking control loop system which attains a stable, high sensitivity. To satisfy stability, sensitivity, and practical requirements, a second-order variable parameter astatic zero tracking system has been adopted. Response of the test equipment to a typical picture has been analyzed, and the theoretical results have been verified by experiment. If the sensitivity parameter is fixed, the first system becomes the phase tracking circuitry of the second system. This is a carrier reproducing system which uses time band filtering, sampling, and which must fully utilize trisynchronization (V- and H-synch and blanking) information to secure the start and continuance of sampling. Its carrier regeneration system features the use of a self-holding gate which synchronously gates by using the natural and horizontal synchronous periods and not regating for a certain fixed time period. The stationary and starting transient responses of this system are discussed and its reliable starting verified through experimentation. It has been found to be effective with an ECR (excess carrier ratio) of 0.5. A phase tracking method similar to that in the first system was used.","PeriodicalId":134522,"journal":{"name":"IEEE Transactions on Communication Technology","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1967-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115874927","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
Automatic Number Identification for Small Step-by-Step Offices 小型分步办公室的自动号码识别
IEEE Transactions on Communication Technology Pub Date : 1967-04-01 DOI: 10.1109/TCOM.1967.1089567
H. Moore
{"title":"Automatic Number Identification for Small Step-by-Step Offices","authors":"H. Moore","doi":"10.1109/TCOM.1967.1089567","DOIUrl":"https://doi.org/10.1109/TCOM.1967.1089567","url":null,"abstract":"With the aid of a new automatic number identification (ANI) system, direct distance dialing (DDD) is being provided to telephone customers served by small step-by-step offices. This paper describes this new system designated ANI Type-C. Electronic and electromechanical techniques are used with glow lamps serving as major circuit elements. A brief review of previous ANI developments is also included.","PeriodicalId":134522,"journal":{"name":"IEEE Transactions on Communication Technology","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1967-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122483312","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 Approximate Analysis of a Periodically Switched Filter 周期开关滤波器的近似分析
IEEE Transactions on Communication Technology Pub Date : 1967-04-01 DOI: 10.1109/TCOM.1967.1089564
K. Ozone
{"title":"An Approximate Analysis of a Periodically Switched Filter","authors":"K. Ozone","doi":"10.1109/TCOM.1967.1089564","DOIUrl":"https://doi.org/10.1109/TCOM.1967.1089564","url":null,"abstract":"A rapid means of analyzing linear networks containing a periodically operated switch is presented. It is assumed that the switch closure time is very short compared to the network time constants and the switching period. The method is based on obtaining an approximation for the pulse transfer function (ptf) of an arbitrary minimum reactance impedance by approximating the real part of the impedance as a sum of triangular elemental real part impedances. The approximate ptf is used in the analysis of a specific resonant transfer filter and the transmission response is computed. The approximate result is compared with the result based on more exact calculations. A table of normalized values for the ptf corresponding to elemental triangles is included so that the approximation can be used generally for other applications.","PeriodicalId":134522,"journal":{"name":"IEEE Transactions on Communication Technology","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1967-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127476838","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
Potential Demand Shift and Its Impact on Technological Implementation in International Telecommunications 潜在需求转移及其对国际电信技术实施的影响
IEEE Transactions on Communication Technology Pub Date : 1967-04-01 DOI: 10.1109/TCOM.1967.1089562
J. McNaul
{"title":"Potential Demand Shift and Its Impact on Technological Implementation in International Telecommunications","authors":"J. McNaul","doi":"10.1109/TCOM.1967.1089562","DOIUrl":"https://doi.org/10.1109/TCOM.1967.1089562","url":null,"abstract":"Preliminary thoughts on the effect a shift in demand type from voice to video bandwidths may have on international communications are presented. Given that a demand may evolve for point to point video, or high capacity data transmission, some potential impacts on technological implementation of transmission means are raised and their possible effects on industry structure mentioned.","PeriodicalId":134522,"journal":{"name":"IEEE Transactions on Communication Technology","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1967-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125326683","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
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