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Communications Society Magazine, IEEE

Issue 1 • Date January 1978

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Displaying Results 1 - 13 of 13
  • [Front cover and table of contents]

    Page(s): 0
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  • Calendar of events

    Page(s): 1
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  • ComSoc spotlight

    Page(s): 2
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  • Part IV--The evolution of techniques for data communication over voiceband channels

    Page(s): 10 - 14
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    Data communication has grown dramatically in the past two decades, both in technical sophistication and in usage. While channels and networks designed expressly for data use have emerged, the voiceband channels of the telephone network continue to be the major transmission medium; data sets, or modems, play a role analogous to that of the telephone in voice communication. Fundamental developments such as adaptive equalization along with bandwidth-conserving signal formats have allowed the modem to better match the characteristics of the analog channel, resulting in increased available throughput. The quest for further improvements, along with elegant implementations and attractive user features, provide a continuing challenge to communication engineers. When the need arose to communicate digital data at transmission rates substantially higher than telegraph speeds, first for defense about mid-century and then for industry in the late 1950's, all the ingredients required for successful implementation were at hand. Decades earlier, Nyquist had formulated the filtering or band shaping requirements to allow the independent transmission of a sequence of signal samples. Just prior to mid-century, Shannon had published his celebrated information theory, which showed engineers the maximum rate at which they could signal through a channel if only they were clever enough. The telephone network, especially in the United States, had reached a high state of development and widespread accessibility; it seemed like an ideal vehicle to carry the new data communication traffic. View full abstract»

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  • Conferences

    Page(s): 15
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  • Comsoc election result announced

    Page(s): 16 - 17
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  • Part I--Digital techniques for communication signal processing

    Page(s): 18 - 22
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    Digital processing of communication signals is now a practical alternative to analog processing. This application of a well-understood theory as a viable alternative is largely due to the availability of low cost arithmetic and storage LSI circuits; the availability of low cost A/D and D/A circuits; the commonplace occurrence of digital signals due to the ever increasing use of digital transmission and routing; and the significant advantages offered by the flexibility of the digital approach. This paper is an attempt to present in an introductory manner the what, why, where, and how of digital signal processing. View full abstract»

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  • Part II--Digital signal processing architecture

    Page(s): 23 - 27
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    A number of the basic considerations involved in the selection of an overall digital signal processor architecture are reviewed. View full abstract»

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  • Book reviews - Introduction to communication systems

    Page(s): 28
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  • International abstracts

    Page(s): 29
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  • U.S.Abstracts

    Page(s): 30 - 31
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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