Dual Tone Multi Frequency - Definition. Was ist Dual Tone Multi Frequency
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Was (wer) ist Dual Tone Multi Frequency - definition

TELECOMMUNICATION SIGNALING SYSTEM
Dual-tone multifrequency signaling; DTMF; Multifrequency signaling; Dual tone multi-frequency; Touch tone; Touch Tone; Dual tone multi frequency; Tone dialing; Touch-Tone; Touch-tone; Touch tone frequencies; Touch tone music; Touchtone; Touch-tone dialing; Dtmf; Dual-tone multi-frequency; Dual-Tone Multi-Frequency; Dual-tone multi-frequency signalling; Touch tones; ITU-T Recommendation Q.23
  • Two CMD CM8870CSI DTMF Receivers
  • [[Autovon]] keypads were one of the few production units to include all 16 DTMF signals. The red keys in the fourth column produce the A, B, C, and D DTMF events.
  • DTMF keypad layout.
  • Combination of 1209 Hz and 697 Hz sine waves, representing DTMF "1"

Dual Tone Multi Frequency         
<communications> (DTMF, or "touch-tone") A method used by the telephone system to communicate the keys pressed when dialling. Pressing a key on the phone's keypad generates two simultaneous tones, one for the row and one for the column. These are decoded by the exchange to determine which key was pressed. (1995-03-28)
Dual-tone multi-frequency signaling         
Dual-tone multi-frequency signaling (DTMF) is a telecommunication signaling system using the voice-frequency band over telephone lines between telephone equipment and other communications devices and switching centers. DTMF was first developed in the Bell System in the United States, and became known under the trademark Touch-Tone for use in push-button telephones supplied to telephone customers, starting in 1963.
touch-tone         
¦ adjective denoting push-button telephones generating tones to dial rather than pulses.

Wikipedia

Dual-tone multi-frequency signaling

Dual-tone multi-frequency signaling (DTMF) is a telecommunication signaling system using the voice-frequency band over telephone lines between telephone equipment and other communications devices and switching centers. DTMF was first developed in the Bell System in the United States, and became known under the trademark Touch-Tone for use in push-button telephones supplied to telephone customers, starting in 1963. DTMF is standardized as ITU-T Recommendation Q.23. It is also known in the UK as MF4.

Touch-Tone dialing with a telephone keypad gradually replaced the use of rotary dials and has become the industry standard in telephony. Other multi-frequency systems are also used for signaling on trunks in the telephone network.