Overview

This study is undertaken to determine whether recent technological progress has resulted in the development of modulation techniques which are superior to frequency modulation for use with mobile or man packed military radio sets. A simplified model of the single channel commun1cation system is developed. In this model the modulation process is considered in two steps. First, some form of speech processing is assumed to be performed. Various types of speech processing considered are clipping, amplitude limiting, filtering, sampling, coding, and vocoding. The second stage of modulation is considered to be the modulation of a radio frequency signal with the output of the speech processor. This model leads logically to a determination of the various possible modulation techniques. Next, performance criteria are developed by considering the requirements of the military communications user and the limitations imposed by the military environment. These considerations result in the selection of spectrum utilization, signal to noise ratio, simplicity of operation, size and weight, reliability and power required as the criteria to be used for the comparison of the various modulation techniques. This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work was reproduced from the original artifact, and remains as true to the original work as possible. Therefore, you will see the original copyright references, library stamps (as most of these works have been housed in our most important libraries around the world), and other notations in the work. This work is in the public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work. As a reproduction of a historical artifact, this work may contain missing or blurred pages, poor pictures, errant marks, etc. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.

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