Sign in to follow this  
Followers 0
warmonger666

DTMF Project

5 posts in this topic

Ok.

I was wondering if anyone could give me some help with this project.

I am trying to build a DTMF recogniser. A unit that can be hooked to a phone line and give the corresponding binary translation of the DTMF tones produced by a caller.

Once I have the DTMF as a digital equivalent I'm solid. Is there some kind of IC chip designed for this task (common to phone systems possibly)? If so where can I find one?

:help:

0

Share this post


Link to post
Share on other sites

There are a few DTMF "receiver" chips on the market:

http://assets.zarlink.com/DS/zarlink_MT8870D_OCT_06.pdf

http://pdf1.alldatasheet.com/datasheet-pdf.../SSI75T203.html

http://pdf1.alldatasheet.com/datasheet-pdf...L/CD22204E.html

..just to name a few :) ..

You can get the 'MT8870DE' for around $1.45 here, http://www.futurlec.com/ICSFZarlink.shtml

Or you could probably pick one up at Mouser (mouser.com) or Digi-Key (digikey.com).

DTMF Decoder Projects via Google:

http://www.bobblick.com/techref/projects/t...ec/tonedec.html

http://www.boondog.com/tutorials/dtmf/dtmf.htm

http://members.aol.com/pdrunen/

http://www.ee.washington.edu/conselec/A95/...lome/dschem.gif

I've built a few in the past, fairly easy-straight forward project.

Hope this helps,

-kenetik

Edited by kenetik
0

Share this post


Link to post
Share on other sites

OR there are a number of software DTMF decoders, im sure if you google them youll find some... but I understand wanting the challenge of building your own.

0

Share this post


Link to post
Share on other sites

I have a dialerbuddy that works GREAT at recording DTMF digits / audio over the line :D aka wiretap in a handy box :P

Things spendy as fuck but well worth it if you can put it to use.

I installed a headphone jack so I can hookup a tape recorder. ([note to fbi] no I dont use this to commit fellonies only personal telecom technical work / authorized telecom technical work.)

As for building one I have no clue.

http://www.dialerbuddy.com/

0

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!


Register a new account

Sign in

Already have an account? Sign in here.


Sign In Now
Sign in to follow this  
Followers 0