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Application of Touch-Tone calling in the Bell system

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3 Author(s)
Benson, M. L. ; American Telephone and Telegraph Company, New York, N. Y. ; Crutchfield, F. L. ; Hopkins, H. F.

A new system of initiating telephone calls employing voice-frequency tones, controlled by actuating buttons, and known as ¿Touch-Tone Calling¿ is now in service on a trial basis. The resultant marked improvement in speed and ease of use appears to appeal strongly to telephone users. This system is described and the engineering and psycho-physical steps necessary to its development are outlined. Field tests of system feasibility and results obtained are discussed. Three companion papers present technical features of the system components.

Published in:

American Institute of Electrical Engineers, Part I: Communication and Electronics, Transactions of the  (Volume:82 ,  Issue: 1 )