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Communications Society Magazine, IEEE

Issue 1 • Date January 1977

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Displaying Results 1 - 14 of 14
  • [Front cover and table of contents]

    Page(s): 0
    Save to Project icon | Request Permissions | PDF file iconPDF (239 KB)  
    Freely Available from IEEE
  • Editorial - Good news... and an invitation

    Page(s): 1
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    Freely Available from IEEE
  • ComSoc spotlight

    Page(s): 2
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    Freely Available from IEEE
  • Presentation of the first Alexander Graham Bell medal

    Page(s): 3
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  • ComSoc election results announced

    Page(s): 4 - 5
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  • ComSoc awards

    Page(s): 6 - 7
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  • Echo cancellation in the telephone network

    Page(s): 8 - 15
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1376 KB)  

    Most long-distance telephone connections generate echoes, which must be heavily attenuated in order to obtain satisfactory transmission quality. Voice-actuated switches (echo suppressors) are widely used to eliminate echoes but have an unfortunate tendency also to cut out part of the desired signal from the other end of the line. Because the distortion caused by echo suppressors is particularly noticeable on satellite-routed connections, the advent of telephone communication via satellite, including the recent introduction of satellite circuits into the U.S. domestic network, has motivated the search for a better way to eliminate echoes. The answer may be the echo canceler, an adaptive filter which selectively eliminates echoes. Advanced echo canceler designs have been undergoing field trials in recent years. This article explains why echo cancelers are advantageous and how they work. View full abstract»

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  • Cost effectiveness in global satellite communications

    Page(s): 16 - 27
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1636 KB)  

    Global satellite communications, as the INTELSAT system has demonstrated, is a commercially successful business with over ten years of operating experience. The system provides high-quality reliable communications over a large number of links in successful competition with other modes of communications. The cost effectiveness of the INTELSAT system has increased in the last decade as measured by the per-circuit-year cost of satellites in orbit, space segment charges, and earth station and total circuit costs. Economies of scale and the use of progressively more advanced technology are expected to increase the cost effectiveness of global satellite communications in the future. View full abstract»

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  • U.S. Abstracts

    Page(s): 28
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  • International abstracts

    Page(s): 29
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  • Society and chapter news

    Page(s): 30
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  • Call for papers

    Page(s): 30
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  • IEEE seeking delegates to attend 1977 USSR popov society congress

    Page(s): 32
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  • [Back cover]

    Page(s): c4
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Aims & Scope

This Periodical ceased publication in 1978. The current retitled publication is 

IEEE Communications Magazine.

Full Aims & Scope