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Signals in Communication Engineering History

机译：通讯工程史上的信号

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This paper is a study of various electric signals, which have been employed throughout the history of communication engineering in its two main landmarks: the telegraph and the telephone. The signals are presented in their time and frequency domain representations. The historical order has been followed in the presentation: wired systems, spark gap wireless, continuous wave (CW) and amplitude modulation (AM), detection by rectification, and frequency modulation (FM). The analysis of these signals is meant to lead into a better understanding of the evolution of communication technology. The material presented in this work could be used to illustrate “Signals and Systems” and “Communication Systems” courses by taking advantage of its technical as well as historical contents.
机译：本文是对各种电信号的研究，在整个通信工程的历史中，电信号的两个主要标志是电报和电话。信号以其时域和频域表示形式呈现。本演示文稿遵循的历史顺序是：有线系统，无线火花隙，连续波（CW）和调幅（AM），通过整流检测以及调频（FM）。对这些信号的分析旨在使人们更好地了解通信技术的发展。通过利用其技术和历史内容，本文中介绍的材料可用于说明“信号和系统”和“通信系统”课程。

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