학술논문
Applications of touch-tone calling
Document Type
Periodical
Source
Electrical Engineering Electr. Eng. Electrical Engineering. 81(4):262-267 Apr, 1962
Subject
Language
ISSN
0095-9197
2376-7804
2376-7804
Abstract
“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 improvement in speed and ease of use appeal strongly to telephone users. Results of field tests of system feasibility are discussed