DTMF signaling

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Explore the main themes, entities and connections around DTMF signaling. Start with the topic map, then use the sections below for research and deeper semantic analysis.

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Multifrequency signaling

Pulse dialing Local loop Calling party Pure tone Sine wave

21 related topics

Square, star, A, B, C, and D

Octothorpe Asterisk Vertical service codes Caller ID Payphones

12 related topics

Decoding

Filter banks Digital signal processing Goertzel algorithm MUSIC algorithm

4 related topics

Other multiple frequency signals

Call-progress tones Precise Tone Plan Modems

3 related topics

Key facts & relationships

High-confidence facts extracted from structured source data. Use them as anchors for further research.

Abbreviation: DTMF
Authors: Bell Laboratories
Committee: ITU-T
Status: Active
Year started: 1963; 63 years ago (1963)

Topics to explore

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Overview

Telecommunication signaling
Telephone lines Telephone line
Switching centers Switching center
Bell System
Push-button telephones Push-button telephone
ITU-T
Telephone keypad
Rotary dials Rotary dial
Multi-frequency
Intercom door systems Intercom

Multifrequency signaling

Pulse dialing
Local loop
Calling party
Pure tone
Sine wave
Protocols Communications protocol
CCITT
In-band
Long-distance Long-distance calling
Telephone operators Switchboard operator
Digit Numerical digit
Keypad
R2 R2 signalling
SS7 Signalling System No 7
Northern Electric Company
In-band signaling
Cable television
Broadcasters Broadcasting
Cue tones Cue tone
Out-of-band signaling
IP telephony

Keypad

Decoding

Other multiple frequency signals

Advanced semantic analysis

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Map overview Semantic statistics

Nodes58

Edges57

Triples14

Avg. degree1.97

Density0.034483

Components1

How this topic connects Entity context

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DTMF signaling

Top relations

related to Decoding · 5

DTMF signaling → As DTMF, By, DTMF, Goertzel, MUSIC

Abbreviation · 1

DTMF signaling → DTMF

Authors · 1

DTMF signaling → Bell Laboratories

Committee · 1

DTMF signaling → ITU-T

Status · 1

DTMF signaling → Active

Website · 1

DTMF signaling → ITU-T Recommendation Q.23

Year started · 1

DTMF signaling → 1963; 63 years ago (1963)

Important terminology Word statistics

Use these terms to understand the vocabulary surrounding the topic, not as a checklist for keyword stuffing.

Important terminology

dtmf signaling telephone used tones system signals multi-frequency bell keypad equipment also systems united touch-tone signal switching frequencies control use

Entity relationships Subject–Predicate–Object triples

Subject	Predicate	Object	Confidence	Src
DTMF signaling	Abbreviation	DTMF	1.00	infobox
DTMF signaling	Authors	Bell Laboratories	1.00	infobox
DTMF signaling	Committee	ITU-T	1.00	infobox
DTMF signaling	Status	Active	1.00	infobox
DTMF signaling	Website	ITU-T Recommendation Q.23	1.00	infobox
DTMF signaling	Year started	1963; 63 years ago (1963)	1.00	infobox
Digitone were used by the Northern Electric Company in Canada.As a method of in-band signaling	instance of	Other trade names	0.80	text
DTMF signals were also used by cable television broadcasters as cue tones to indicate the start	instance of	Other trade names	0.80	text
stop times of local commercial insertion points during station breaks for the benefit of cable companies	instance of	Other trade names	0.80	text
DTMF signaling	related to Decoding	DTMF	0.60	section
DTMF signaling	related to Decoding	By	0.60	section
DTMF signaling	related to Decoding	Goertzel	0.60	section

Related concept clusters Concept neighborhoods

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Connections between topic areas Semantic bridges

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