Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!nrl-cmf!ukma!gatech!hubcap!ncrcae!ncr-sd!serene!pnet12!gbell
From: gbell@pnet12.cts.com (Greg Bell)
Newsgroups: sci.electronics
Subject: Re: Dial tone generation
Message-ID: <349@serene.UUCP>
Date: 27 Jan 89 22:16:05 GMT
Sender: root@serene.UUCP
Organization: People-Net [pnet12], Del Mar, CA
Lines: 15


    
>Now that we can decode DTMF, how hard would it be to add some functionality
 >to produce a dial tone?
 
 
     Well, according to my notes, a "precision dial tone" (whatever
"precision" means)  is a combination of 350 Hz and 440 Hz (ie. those two
frequencies at the same time).
 
 
    Greg Bell_________________________________________________________
      Hardware hacker          |
      Electronics hobbyist     | UUCP:  uunet!serene!pnet12!gbell
      EE major at UC San Diego |