Title :
A robust approach to tele-control using DTMF signaling [telephone call transferring equipment]
Author :
Nishi, Hiroyuki ; Shinohara, Shin´ichi ; Umemoto, Hiroki
Author_Institution :
NTT, Yokosuka, Japan
fDate :
8/1/1991 12:00:00 AM
Abstract :
A novel method is proposed which is effective in preventing malfunction in the DTMF (dual-tone multifrequency) signal decoder caused by the holding melody. When the monitoring time is one second, the probability of a malfunction is at most 0.01. The proposed approach is a double DTMF signal monitoring method using the statistical characteristics of a DTMF signal decoder for a holding melody
Keywords :
signalling (telecommunication networks); telephone station equipment; DTMF signaling; double DTMF signal monitoring method; dual-tone multifrequency signal decoder; holding melody; telephone call transferring equipment; Automatic control; Communication system control; Computer vision; Control systems; Decoding; Frequency; Gas detectors; Monitoring; Robustness; Telephony;
Journal_Title :
Consumer Electronics, IEEE Transactions on
