CHAPTER 44

FACSIMILE (FAX)

In addition to basic signals consisting of speech, music, or telegraph codes, a telecommunication system is often required to transmit signals of a visual nature. Facsimile means an exact reproduction, and in facsimile transmission an exact reproduction of a document or picture is provided at the receiving end. Television means visually at a distance and a television system is used to reproduce any scene at the receiving end. It differs from facsimile in that the scene may be live (i.e. include movement).

Information is transmitted at a much faster rate in television transmission than it is in facsimile transmission. As a result, television transmission requires a much larger bandwidth, and special wideband circuits ...

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