Apparatus standards of telephonic transmission, and the technique of testing microphones and receivers
作者:
B.S.Cohen,
期刊:
Journal of the Institution of Electrical Engineers
(IET Available online 1928)
卷期:
Volume 66,
issue 374
页码: 165-189
年代: 1928
DOI:10.1049/jiee-1.1928.0008
出版商: IEE
数据来源: IET
摘要:
The first part of this paper deals with the selection, calibration, maintenance and operation of apparatus standards selected as representative samples of the types of telephones in general use. Particulars of the acoustical and electrical characteristics of microphones and receivers are given.The second part of the paper deals with telephone standards giving high-quality transmission and specially designed for standardization purposes, and of which the acoustical and electrical characteristics are capable of precise specification and measurement.The Appendix deals with the range of frequencies required for various classes of telephonic transmission.
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