IEEE - Institute of Electrical and Electronics Engineers, Inc. - Applications of touch-tone calling

Author(s): M. L. Benson ; F. L. Crutchfield ; H. F. Hopkins
Publisher: IEEE - Institute of Electrical and Electronics Engineers, Inc.
Publication Date: 1 April 1962
Volume: 81
Page(s): 262 - 267
ISSN (Paper): 0095-9197
DOI: 10.1109/EE.1962.6446830
Regular:

"Touch-Tone Calling," a system for initiating telephone calls by means of voice-frequency tones controlled by actuating buttons, is now in service on a trial basis. The resultant marked... View More

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