Recommend me books about DTMF

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mengghee

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does anybody know any good books on DTMF ? ebooks ? or can anybody tell me is there is any other alternative way instead of using DTMF ? thank you

regards,
mengghee
 

Re: DTMF ?

Try this application note from Zarlink

**broken link removed**

Alternatives depend on your application. Dialling is always done either with pulse dialling or with DTMF. Data transmission can be done with FSK which is simpler.
 

Re: DTMF ?

DTMF is just the fine way for a lot of things
what IC do you use ?
I recommend MITEL and Zarlink
I had some sensibility problems with the input circuit using CMX
 

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