DocumentCode :
1398636
Title :
An experimental voice-frequency dialling system
Author :
Toyoda, K. ; Yamamoto, T. ; Nakamura, T. ; Shimada, R. ; Sugihara, K.
Author_Institution :
Fuji Communication Apparatus Manufacturing Co., Kawasaki, Japan
Volume :
107
Issue :
20
fYear :
1960
fDate :
11/1/1960 12:00:00 AM
Firstpage :
371
Lastpage :
376
Abstract :
An experimental voice-frequency dialling system is described for signalling between a telephone set with pushbutton caller and timedivision-multiplex switching system, in which the talking path and logical circuit are both time-shared. In order to get good matching between signal-receiving and time-shared logic, single voice-frequency signals sent from a station set are digitally recognized by a periodmeasuring counter in the register without demodulation. The paper discusses some signal-level and noise problems and gives some criteria for system design, together with experimental results. Further consideration is given to frequency allocation, number of cycles and recognition time, and a signal generator is also described.
Keywords :
automatic telephone systems; telecommunication switching; telephone equipment;
fLanguage :
English
Journal_Title :
Proceedings of the IEE - Part B: Electronic and Communication Engineering
Publisher :
iet
ISSN :
0369-8890
Type :
jour
DOI :
10.1049/pi-b-2.1960.0059
Filename :
5244236
Link To Document :
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