Abstract
A compandor for use on telephone speech circuits, which has a compression/expansion ratio of 2, and which gives a subjective improvement in signal/noise ratio of about 25 dB, is described. Junction transistors are used as variable-loss elements, control-current rectifiers and for temperature compensation, as well as for amplification. Use is made of the properties of the base-emitter junction of the transistor to achieve a closer approximation to the desired compression/expansion characteristic, over a wider range of signal levels than has been possible in the past, without the need for special selection or matching of the variable-loss circuit elements. A small number of compandors has been made and tested in the laboratory, and the performance of a typical unit is described.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Proceedings of the IEE - Part B: Electronic and Communication Engineering
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
