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- Path: sparky!uunet!zaphod.mps.ohio-state.edu!rpi!batcomputer!munnari.oz.au!uniwa!uniwa!nfm
- From: markd@uniwa.uwa.edu.au (Mark Diamond)
- Newsgroups: sci.electronics
- Subject: Re: Tone frequencies on telephone
- Date: 19 Nov 1992 21:36:08 +0800
- Organization: The University of Western Australia
- Lines: 27
- Message-ID: <1eg588INNs78@uniwa.uwa.edu.au>
- References: <1992Nov17.075719.23612@riacs.edu>
- NNTP-Posting-Host: uniwa.uwa.edu.au
-
- gt8741b@prism.gatech.edu (Chris Adams) writes:
-
- >Can someone tell me what the frequencies of the buttons on a telephone generate
- >and what the dial tone frequency is? I am trying to build something, and I
- >need to recognize a dial tone, and generate button presses.
- >--
- >Chris Adams | "If tin whistles are made of tin,
- >Georgia Tech | what do they make foghorns from?"
- >Internet: gt8741b@prism.gatech.edu| -- Lonnie Donegan
- >----------------------------------+
-
- I don't recall the tone frequencies. However, they are easily found in
- the published ISO, British and Australian standards. Presumably these,
- or the USA equivalent should be easily obtainable. Basically, each
- digit (as well as the * and # functions) are composed of 2 frequencies
- sounded together. All keys in the same Column share the same lower tone
- (with the lower tone ascending across columns) ... and similarly for the
- rows.
-
-
-
-
- M A R K R D I A M O N D | The University of Western Australia | All opinions
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