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Where can I get some info about DTMF?

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ajaykumar988

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I need some application notes on DTMF.can anyone provide it ?
 

Re: DTMF info required

THe best source for the information of DTMF
You can find in www.4shared.com, you just have to type DTMF in search field it will give numerous of links about it.
 
Re: DTMF info required

DTMF Dual-tone multi-frequency (DTMF) signaling is used for telephone signaling over the line in the voice-frequency band to the call switching center. The version of DTMF used for telephone tone dialing is known by the trademarked term Touch-Tone, and is standardised by ITU-T Recommendation Q.23. A different version is used for signaling internal to the telephone network.

DTMF is an example of a multifrequency shift keying (MFSK) system. Today DTMF is used for most call setup to the telephone exchange, at least in developed regions of the world, and trunk signalling is now done out of band using the SS7 signaling system. The in band trunk signalling tones were different from the DTMF tones known as Touch-Tone, with a two out of six code being used rather than a square matrix.
 
Re: DTMF info required

All you need in this page and also a related project
**broken link removed**
 

DTMF info required

thanks falflay good informative site
 

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