By Topic

Communications, IEEE Transactions on

Issue 4 • Date August 1972

Filter Results

Displaying Results 1 - 25 of 25
  • [Front cover and table of contents]

    Publication Year: 1972 , Page(s): 0
    Save to Project icon | Request Permissions | PDF file iconPDF (218 KB)  
    Freely Available from IEEE
  • Preface

    Publication Year: 1972 , Page(s): 687 - 688
    Save to Project icon | Request Permissions | PDF file iconPDF (183 KB)  
    Freely Available from IEEE
  • [Back cover]

    Publication Year: 1972 , Page(s): 0
    Save to Project icon | Request Permissions | PDF file iconPDF (189 KB)  
    Freely Available from IEEE
  • Optical Communications in Japan

    Publication Year: 1972 , Page(s): 725 - 730
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (712 KB)  

    This paper reviews research and developmental activities in optical communications currently under way in Japan. Three major systems: 1) atmospheric optical communication systems, 2) optical-cable systems, and 3) lens-waveguide systems, using various types of lasers and newly developed optical devices and components, have been extensively studied at the Electrical Communication Laboratories of Nip... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Time-Division Switching Networks With Partial-Access Pulse Shifters Performing Serial-Parallel Conversion

    Publication Year: 1972 , Page(s): 762 - 768
    Cited by:  Patents (2)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (712 KB)  

    Some means of time-slot interchanging is required in a pulse-code-modulation (PCM) transit switching system to satisfy the blocking requirements due to the fact that average trunk loading is high and that the time slots of incoming calls are preassigned at the remote office. This paper presents the use of serial-to-parallel conversion and parallel-to-serial conversion pulse shifters, both having l... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Data Communications in Japan

    Publication Year: 1972 , Page(s): 753 - 762
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1000 KB)  

    Aspects of data communications in Japan are broadly summarized in this paper. First, various networks for data communication are described and some examples of data communication services using these networks are mentioned. Next, some topics in data communication technology are outlined. Topics include two large-scale computer projects and R&D on pattern recognition techniques in the data-proc... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Synchronization for Unknown Signal Sequence by Learning Procedure

    Publication Year: 1972 , Page(s): 780 - 787
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (696 KB)  

    Methods of synchronization for an unknown signal sequence by learning procedure, which computes a posteriori probabilities for the signal location, are presented. First, to avoid the difficulties of the interference between successive intervals, a signal sequence with ample guard spaces for getting rid of the interference is treated. Next, the case without guard space is treated. To the nonsupervi... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • General Trend in Electrical Communications in Japan

    Publication Year: 1972 , Page(s): 689 - 696
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (856 KB)  

    Systems are currently being designed for higher reliability and greater economy. Larger transmission capacity is required to meet a rapid increase in recent communication demands instigated by the introduction of video and information communications facilities. More flexibility, to deal with the variety of communication modes to come, and smaller hardware dimensions, to overcome situations caused ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Large-Capacity Magnetic-Drum Memory System for an Electronic Switching System

    Publication Year: 1972 , Page(s): 768 - 774
    Cited by:  Patents (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (760 KB)  

    A stored program-controlled electronic switching system (ESS) requires a large-capacity memory to store various kinds of programs and data. This paper describes a hierarchy arrangement including a high-speed memory and a low-cost largecapacity magnetic-drum memory for reduction of the cost of the ESS. The paper also describes the design philosophy, reliability, structure, and evaluation of the sys... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Queueing-Delay Formula for Common-Channel Signaling Systems

    Publication Year: 1972 , Page(s): 787 - 791
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (520 KB)  

    An approximate queueing model for common-channel signaling systems has been developed and the queueing-delay distribution has been obtained. As a special case, the approximate average queueing-delay formula for common-channel signaling systems has been derived. By simulation, it has been ascertained that this formula is reasonably accurate. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Satellite Communications in Japan

    Publication Year: 1972 , Page(s): 730 - 737
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (928 KB)  

    This paper describes recent research and development of satellite communication technology in Japan together with the future prospects. Newly developed earth station facilities for both commercial and experimental purposes are described first. New satellite communication systems, such as STAR, SMAX, TTT, SSB-PM, and SSRA, which originated and/or have been studied extensively in Japan, are describe... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Cable Communications in Japan

    Publication Year: 1972 , Page(s): 707 - 717
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1216 KB)  

    Japanese coaxial toll systems at the end of the fiscal year 1970 had grown to 29 980 km of coaxial cable (including both tubes of two-tube systems). In the next seven years, 1971 to 1977, the requirement is expected to be three times this capacity. Cable transmission systems fully utilizing modem electronics and communication engineering techniques are being developed to best meet this expected gr... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Carrier Synchronizer for Coherent Detection of High-Speed Four-Phase-Shift-Keyed Signals

    Publication Year: 1972 , Page(s): 803 - 808
    Cited by:  Papers (9)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (592 KB)  

    In a high-speed digital radio relay system with four-phase-shift keying and coherent detection, it is very important to realize an accurate, stable, and wide-band carrier synchronizer. In this paper, the influence of time delay causing trouble for the wide-band synchronizer realization is analyzed. Then the design procedure of this synchronizer is described. Finally, the realizability of such a sy... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Characteristics of an Experimental Guided Millimeter-Wave Transmission System

    Publication Year: 1972 , Page(s): 808 - 813
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (600 KB)  

    An experimental guided millimeter-wave transmission system is constructed employing two 806-Mbit/s digital repeaters, an 8.4-km waveguide line loop, and channel coupling networks. This paper presents its characteristics, such as waveforms, amplitude and delay, error rate, and timing jitter in some detail. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • An Audio Response Unit Based on Partial Autocorrelation

    Publication Year: 1972 , Page(s): 792 - 797
    Cited by:  Papers (19)  |  Patents (3)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (584 KB)  

    This paper describes an audio response unit used in data communication services. The speech segments necessary to respond are stored in a large capacity magnetic drum in terms of partial autocorrelation (PARCOR) coefficients and excitation source information. PARCOR coefficient is a new parameter to express accurately the spectrum envelope of speech signals. Multiple speech signals can be synthesi... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Mobile Radio Communications in Japan

    Publication Year: 1972 , Page(s): 738 - 746
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (920 KB)  

    After a short historical sketch of mobile communications in Japan, technical problems and future prospects are described. The peculiarities characteristic of mobile communication include complicated radio propagation and requirements for continuous communication and determination of mobile subscribers' location. This paper discusses major problems of future mobile communication, for example, radio... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Microwave and Millimeter-Wave Communications in Japan

    Publication Year: 1972 , Page(s): 717 - 725
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (976 KB)  

    This paper reviews the status of research and development in both microwave radio-relay systems and millimeter-wave transmission systems as well as the technical features in these fields, mainly developed under the auspices of Nippon Telegraph and Telephone Public Corporation (NTT). Recent activities have been the development of new solid-state devices and high-capacity systems. The application of... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Construction of Highly Accurate Segment Companding Voice Codec

    Publication Year: 1972 , Page(s): 825 - 829
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (496 KB)  

    Construction of a highly accurate segment companding voice codec is described in this paper. It is shown that an ideal precompressor placed in front of the segment coder enables moderating the accuracy required by 4 times in the 13-segment coder and by 8 times in the 15-segment coder. Two precompressor circuits with a negligible accuracy degradation are proposed and their performances are thorough... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Electronic Switching Systems in Japan

    Publication Year: 1972 , Page(s): 746 - 752
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (832 KB)  

    A recently introduced large-size commercially available electronic switching system has versatility in application to different hierarchies of switching stages and is available not only in the telephone systems, but for forthcoming new telecommunication services such as video telecommunications, data applications, mobile radio telephones, etc. Successive developmental programs are now in progress ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Recent Progress in Communication Theory in Japan

    Publication Year: 1972 , Page(s): 696 - 707
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1448 KB)  

    This paper reviews recent progress in communication theory in Japan, mainly in the past three years. The topics to be discussed include 1) waveform transmission in band-limited channels and active transmission lines, 2) source-coding problems such as optimal quantizing characteristics, delta modulation, and linear transformation, 3) transmission codes, where mainly multilevel codes have been discu... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • New Alphagraphic Printer GRAPHTYPER

    Publication Year: 1972 , Page(s): 797 - 802
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (608 KB)  

    This paper describes a new teleprinter that can print graphs as well as characters through the combination of an X-Y plotter using a high-speed incremental servo with a large-scale integration (LSI) character pattern memory that converts telegraphic signals into plotter signals. This device prints 20 characters per second, and the characters are formed by co... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • An Optical Communication System Using Envelope Modulation

    Publication Year: 1972 , Page(s): 813 - 819
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (704 KB)  

    A wide-band optical communication system that modulates the envelope of the carrier of a high-speed optical pulse having no relation to the PCM signals, was developed. This optical pulse is supplied from a He-Ne gas laser oscillator that is controlled to generate a single transversal mode. The transmission bit rate of this optical communication system is 123 Mbits/s, and this system has a transmis... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Development of a Small-Size Telephone Set Using Integrated Circuits

    Publication Year: 1972 , Page(s): 830 - 834
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (488 KB)  

    A small-size telephone set under developmental research at Nippon Telegraph and Telephone Public Corporation (NTT) is presented. The telephone utilizes recent advances in integrated-circuit technology and miniaturization technology of telephone parts, and offers several additional new services and human engineering improvements in size, weight, and comfort. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Matched-Transmission Technique for Channels With Intersymbol Interference

    Publication Year: 1972 , Page(s): 774 - 780
    Cited by:  Papers (327)  |  Patents (81)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (616 KB)  

    A new transmission scheme for channels with intersymbol interference named "matched-transmission (MT) technique" is proposed. An implementation of the MT system is presented and its relations with conventional techniques are described. It is shown that the partial response scheme is a special case of our new technique. The performance of the MT technique is discussed from the view point of the out... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • TTT System (50 Mbits/s PCM-TDMA System With Time Preassignment and TASI) and Its Satellite Test Results

    Publication Year: 1972 , Page(s): 820 - 825
    Cited by:  Papers (1)  |  Patents (13)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (664 KB)  

    An experimental 50 Mbits/s pulse-code modulation-time-division multiple access (PCM-TDMA) system with time preassignment and time-assignment speech interpolation (TASI) features (called the TTT system) was built for use in a satellite test. This system was designed for application in the INTELSAT IV network and has the channel capacity of more than 700 telephone channels. This capacity can be incr... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.

Aims & Scope

IEEE Transactions on Communications focuses on all telecommunications including telephone, telegraphy, facsimile, and point-to-point television by electromagnetic propagation.

 

 

Full Aims & Scope

Meet Our Editors

Editor-in-Chief
Robert Schober
University of British Columbia