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首页> 外文期刊>Electrical Engineers - Part III: Radio and Communication Engineering, Journal of the Institution of >A survey of the telephone transmission-rating problem
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A survey of the telephone transmission-rating problem

机译：电话传输速率问题调查

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摘要

The quality of service provided by a telephone concern is an essential factor in its financial economy. In this relation it is necessarily the overall quality as experienced by the subscribers. Division into different aspects such as traffic quality and transmission quality is arbitrary; each may be separately measured, but for economic balanced planning there is need of a combined measure of overall quality. The paper deals only with transmission quality. Planning has, in the past, been in terms of circuit attenuation and instrument efficiency, with the object of ensuring an adequate level of received speech, but this conception is no longer adequate or economical. The direct observation of the number of times a subscriber finds it necessary, in a unit time-interval, to repeat a word or a sentence is the best known indication of transmission quality in service; a complete rating system based upon such observations and other considerations has been put into operation by the American Telephone and Telegraph Co. In Europe, the repetition-rate criterion of service quality has been accepted, but application of the practice presents difficulties. Two plans are being investigated: (a) attempts are being made to find, under certain restricted conditions, a correlation between repetition rate in service and laboratory articulation tests; and (b) a provisional system of rating based on articulation tests (without reference to repetition rate) is being studied. Both plans are described, and possible correlation procedures are discussed. Reference is made to the economy aspect of rating on the broader basis of transmission quality, but the subject is too large to treat adequately in the present paper. Brief mention is made of foreign publications. Appendices include detailed descriptions of the experimental procedure to establish transmission service ratings. On account of the fluid condition of the subject of the paper, standardized terminology is not in existence and therefo-nre definitions of the terms used are given as a final appendix.
机译：电话服务提供的服务质量是其金融经济的重要因素。在这种关系中，必然是订户所体验的整体质量。划分到不同方面，例如流量质量和传输质量是任意的；可以分别测量每个参数，但是对于经济平衡的计划，需要对整体质量进行综合测量。本文仅涉及传输质量。过去，计划是在电路衰减和仪器效率方面进行的，目的是确保接收到足够水平的语音，但是这种概念已不再足够或不经济。以单位时间间隔直接观察订户发现有必要重复一个单词或一个句子的次数是众所周知的服务传输质量的指标。基于这种观察和其他考虑的完整评级系统已由美国电话电报公司投入运营。在欧洲，服务质量的重复率标准已被接受，但实践的应用存在困难。正在研究两个计划：（a）试图在一定的限制条件下，发现服务的重复率与实验室的咬合测试之间的相关性； （b）正在研究基于发音测试的临时评分系统（不参考重复率）。描述了两个计划，并讨论了可能的关联过程。在更广泛的传输质量基础上，参考了评级的经济方面，但是本文讨论的主题太大，无法适当处理。简要提到了外国出版物。附录包括对建立传输服务等级的实验程序的详细说明。由于本文主题的不确定性，不存在标准化的术语，因此对所用术语的定义已作最终附录。

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