DTMF system |
Codes DTMF
en Français |
DTMF
the signal generated by a DTMF encoder is a direct algebraic summation, in real time, of the amplitudes of two sine (cosine) waves of different frequencies.
i.e. pressing '1' will send a tone made by adding 1209 Hz and 697 Hz to the other end of the line |
DTMF
Dual Tone Multi-Frequency tones, DTMF is the signalling method used for
dialing by most modern telephones |
DTMF Touch Tone Dialling,
Touch Tones |
DTMF TouchTone sounds |
DTMF
also known as touch tone DTMF, or dual tone multi frequency, uses two tones to represent each key on the touch pad |
DTMF chart
DTMF chart |
DTMF chart
DTMF chart, Standard Touch-Tone (DTMF) Dial (key pad), To
hear each tone pair, click mouse on any of the 16 buttons on the "touch-
tone dial" |
DTMF encoding
DTMF means Dual Tone Modulation Frequency. This systems is intended to transmit keys pressed on a keyboard through an audio channel such as a telephone line or
a radio connection. For each pressed key two audio frequencies are emitted: one (higher) corresponds to the column in which the key is in, and the other (lower)
corresponds to the row |
DTMF frequencies
four-by-four array produces 16 different combinations |
DTMF
(Dual-Tone Multi-Frequency) tones
DTMF (Dual-Tone
Multi-Frequency) tones |
DTMF also known as
touch tone dual tone multi frequency, uses two tones to represent each key
on the touch pad |
DTMF keypad |
DTMF signals
Dual-tone Multi-Frequency (DTMF) signaling is the basis for
voice communications control and is widely used worldwide in modern telephony to
dial numbers and configure switchboards. It is also used in systems such as in
voice mail, electronic mail and telephone banking |
DTMF tones
The sounds used for touch tone dialing are refered to as DTMF (Dual Tone
Multiple Frequencies) tones. Each number (as well as the "#" and "*") is
represented by a pair of tones |
Dual tone multi frequency
Dual tone multi frequency, DTMF, also known as Touch Tone or Tone Dialing, is
used for telephone signaling over the line in the voice frequency band to the
call switching center |
Dual
Tone Multi-Frequency (Touch-Tone®) Reference Dual Tone Multi-Frequency, or
DTMF is a method for instructing a telephone switching system of the telephone
number to be dialed, or to issue commands to switching systems or related
telephony equipment |
DTMF Tone Generation
Making Telephone Calls: Transmission of Digits and Signaling Information,
provides an overview of how digits and signaling information are transmitted
when a telephone call is made,
Educypedia |
Spectral Analysis of Dual-Tone Multi Frequency (DTMF)
Spectral Analysis of
Dual-Tone Multi Frequency (DTMF) |
Horizontaal |
Telephony signalling system |
Dial Tone Signal by Country The Dial Tone signal is used in Public Switched
Telephone Networks to indicate that the telephone network switching equipment
has recognized that a telephone has gone off-hook, and the switching equipment
is prepared to receive the dialed digits or DTMF codes |
Ring-back Signaling by Country The Ring-back signal is used in Public
Switched Telephone Networks to indicate to the caller that the called number is
not busy, and that the line is being "rung" or signaled that an incoming call is
present, ... |
Rotary dial system
Theory of Electromechanical Switching |
Signalling between
exchanges
Common Channel Signalling and Channel Associated Signalling |
Signalling System 7
pdf file |
Signalling System 7 Signalling
System #7 (SS7) is a set of telephony signalling protocols which are used to set
up the vast majority of the world's PSTN telephone calls, ... |
SS7 Overview |
SS7 Technology
and Applications Overview This document is intended to be used by those who
want to understand how the Common Channel Signalling System 7 (CCSS7 or SS7)
network works. The goal is to bring voice and data communication personnel who
are unfamiliar with SS7 up to speed rapidly, ...,
Educypedia |
Telecommunications
Reference Index Dual Tone Multi-Frequency (Touch-Tone®) Reference,
International Telephone Dial Tone Signaling Reference, International Telephone
Ring-Back Signal Reference,
International Telephone Busy Signal Reference |
Telephone
touch tone, dial tone, Bell System, phone, Alexander Graham Bell, Thomas Watson,
telegraph, switchboard, ITT, technical description of the Dual Tone Multi
Frequency (DTMF) signals produced by the touch tone dial |
Telephone Number Display The given circuit, when connected in parallel to a
telephone, displays the number dialled from the telephone set using the DTMF
mode. This circuit can also show the number dialled from the phone of the called
party,
pdf file |
Telephony Signaling - Cisco Systems |
Telephony dialing and signaling tones
Dial Tone, Ring Back, Busy tone, on hook, off hook |
The
Public Switched Telephone System
pdf file |
Touch tone telephone
overview when you dial a phone number on a touch tone telephone, the telephone generates a dual tone multifrequency (DTMF) |
Voice Network Signaling and Control |
Horizontaal |
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Last updated on:
2011-01-02
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