Question

explain dtmf in detail. ​

Answer 1

DTMF

The abbreviation DTMF stands for Dual Tone Multiple-Frequency, also called Touch Tone. This can be a code that is used to send information with radio och phone. The prestigious American company Bell Labs that is owned by Nokia is the developer of DTMF.

The tones you hear when pressing buttons on a phone, it DTMF. Every click sends two tones on two different frequencies.Every number have their own, predestined frequencies. Number 1 consists of the tones 697 and 1209 Hz for example. The system has also proved reliability.

DTMF came to the US in the 1940s as a streamline of a system for telephony that then was built on the impulse system, with a rotary dial. Many that grew up in the 1970s or earlier are used to phones with rotary dials which were much more ineffective to call with.

• DTMF is a way to send information over vast distances
• The US based company Bell Labs invented the technique
• DTMF technique isn’t interruption sensitive and is considered reliable
• DTMF is a standard in phone telephony companies
• The previous system was phones with rotary dials
• Every number is coded with 2 tones on predestined frequencies
• Number recognition technique is excepted to be the next big breakthrough in the field

Answer 2

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DTMF, or Dual-Tone Multi-Frequency tones, are in-band telecommunications signals sent over voice frequencies. Commonly used over telephone lines, DTMF tones are also commonly called Touch Tones.

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