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Omschrijving

For the communications engineer, there exist two possible ways for his planning into the future: to follow the rule that communications traffic will have doubled in ab out ten years, and to employ the method of operations research developed during the recent past. Using the latter, for example, an estimate was made of the prospective inter-continental communications re- quirements to be expected for the year of 1970. In the fo'llowing, it will be shown that future requirements can be satisfied for the mentioned period by systems either already in existence or under development, or by systems which are still in the planning stage but can be judged already now as re- gards their operation al efficiency. The basic problems involved in the science of communications are the criteria of bandwidth and signal-to-noise ratio. In selecting the bandwidth for communication purposes, the decisive factor is intelligible transmission audibility which is adversely affected by reduction in bandwidth. The same applies for the signal-to-noise ratio. With normal audio communication, 4 kcls for the bandwidth and 100:1 for the signal-to-noise ratio are in common use.