Article View: sci.electronics
Article #5255Re: DTMF tones
From: Jeff DePolo
Date: Wed, 25 Jul 1990 17:43
Date: Wed, 25 Jul 1990 17:43
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In article <1990Jul25.125339.1665@focsys.uucp> brad@focsys.UUCP (Brad McCloy) writes: > > I also came across some undocumented but supposedly valid tones. >Anyone have an idea or care to guess what they do? >Fo = 697Hz & 1633Hz >F = 770Hz & 1633Hz >I = 852Hz & 1633Hz >P = 941Hz & 1633Hz > >watmath!focsys!brad There are also 4 standard tones labeled A, B, C, and D. Don't have the tones handy but can find them if anyone is interested. It could be that the four tones listed above correspond to A,B,C, and D. --- Jeff +-----------------------+-----------------------------------------------------+ | Jeff DePolo N3HBZ | Internet: depolo@eniac.seas.upenn.edu | | Univ. of Pennsylvania | RF: 146.685- 224.40- 442.70+ 144.455s (Philadelpia) | | Computer Science Eng. | Twisted pair: (215) 386-7199 home | | Class of 1991 | Carrier pigeon: 420 South 42nd St. Philly, PA 19104 | +-----------------------+-----------------------------------------------------+
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<44900010@uxa.cso.uiuc.edu> <44900011@uxa.cso.uiuc.edu> <1202@gold.GVG.TEK.COM> <1990Jul25.125339.1665@focsys.uucp>Show Full Headers
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!rutgers!netnews.upenn.edu!eniac.seas.upenn.edu!depolo From: depolo@eniac.seas.upenn.edu (Jeff DePolo) Newsgroups: sci.electronics Subject: Re: DTMF tones Message-ID: <27492@netnews.upenn.edu> Date: 25 Jul 90 17:43:58 GMT References: <44900010@uxa.cso.uiuc.edu> <44900011@uxa.cso.uiuc.edu> <1202@gold.GVG.TEK.COM> <1990Jul25.125339.1665@focsys.uucp> Sender: news@netnews.upenn.edu Reply-To: depolo@eniac.seas.upenn.edu.UUCP (Jeff DePolo) Organization: University of Pennsylvania Lines: 23