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Definition of "DTMF" |
Dual Tone Multiple Frequency (DTMF) is a signaling method developed by Bell Labs for sending telephone dialing information over the same analog, voice-quality phones lines that carry voice. Each digit is encoded as the sum of two sine wave bursts, of different frequencies. The two-tone method was chosen because it can be reliably distinguished from voice and normal phone conversations are highly unlikely to falsely trigger the DTMF receiver. DTMF was the basis for "TouchTone" (a former trademark of AT&T), the pushbutton system that replaced mechanical rotary dial telephones. / Dual-Tone Multiple Frequency, / Dual Tone Multiple Frequency is a signaling method developed by Bell Labs for sending telephone dialing information over the same analog, voice quality phones lines that carry voice. Each digit is encoded as the sum of two sine wave bursts, of different frequencies. / Dual-tone multi-frequency is a term for push button or Touchtone an AT&T trademark dialing. The pushed button makes a tone, actually the combination of two tones of high and low frequency. They are necessary to access advanced network features such as call barring and call forwarding. / A rotary cap, similar to a mechanically driven rotary switch, used to discharge a pulse forming network. |
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