DocumentCode
1382478
Title
A Touch-Tone caller for station sets
Author
Ham, J. H. ; West, F.
Author_Institution
Bell Telephone Laboratories, Inc., Indianapolis, Ind.
Volume
82
Issue
1
fYear
1963
fDate
3/1/1963 12:00:00 AM
Firstpage
17
Lastpage
24
Abstract
The Touch-Tone caller is a dual-frequency oscillator capable of the generation of any one of 16 combinations of two frequencies under the control of a pushbutton actuated switching mechanism. Initial telephone sets for ordinary services will supply only ten signals. The oscillator design procedure is given and the mechanism is described. The characteristics of special components are discussed. Satisfactory performance of the new caller has been demonstrated in laboratory tests and field trials.
Keywords
Equations; Oscillators; Switches; Transistors; Tuning; Varistors; Windings;
fLanguage
English
Journal_Title
American Institute of Electrical Engineers, Part I: Communication and Electronics, Transactions of the
Publisher
ieee
ISSN
0097-2452
Type
jour
DOI
10.1109/TCE.1963.6373294
Filename
6373294
Link To Document