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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>
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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

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|   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                   |
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