sparks@corpane.UUCP (John Sparks) (06/22/89)
<3237@kitty.UUCP> Sender: Reply-To: sparks@corpane.UUCP (John Sparks) Followup-To: Distribution: Organization: Corpane Industries, Inc. Keywords: In article <3237@kitty.UUCP> larry@kitty.UUCP (Larry Lippman) writes: > > The original DTMF dial design was an _extremely_ clever design >which employed only one germanium transistor with a dual resonant tank >circuit to simultaneously oscillate at two frequencies. A bit off the subject, but does anyone have a list of the frequencies of each number on the keypad? Email would be fine, if only to cut down on multiple postings. I will post the list later. Please help. Thanx -- John Sparks | {rutgers|uunet}!ukma!corpane!sparks | D.I.S.K. 24hrs 1200bps ||||||||||||||| sparks@corpane.UUCP | 502/968-5401 thru -5406 I'm the person your mother warned you about.
sparks@corpane.UUCP (John Sparks) (06/28/89)
[I asked for a list of the touch tone frequencies]
[ I promised to summarize for the net ]
Thanks to Brian Link and Ronald Buttiglieri for the table below:
697 Hz [1] [2] [3] [A]
770 Hz [4] [5] [6] [B]
low group
frequencies 852 Hz [7] [8] [9] [C]
941 Hz [*] [0] [#] [D]
1209 1336 1477 1633
Hz Hz Hz Hz
high group frequencies
Touch-tones are two frequencies sounded together for each button pressed.
For example [1] will sound 697hz and 1209hz.
[A]-[D] are part of the touchtone standard but are presently unused.
Thanks for the help guys.
--
John Sparks | {rutgers|uunet}!ukma!corpane!sparks | D.I.S.K. 24hrs 1200bps
||||||||||||||| sparks@corpane.UUCP | 502/968-5401 thru -5406
Help fight continental drift.henry@utzoo.uucp (Henry Spencer) (07/02/89)
In article <860@corpane.UUCP> sparks@corpane.UUCP (John Sparks) writes: >[A]-[D] are part of the touchtone standard but are presently unused. If you really want to embarrass a modem manufacturer, ask them if their modems can dial A-D. (Some of them can't even dial "*" and "#"!) -- $10 million equals 18 PM | Henry Spencer at U of Toronto Zoology (Pentagon-Minutes). -Tom Neff | uunet!attcan!utzoo!henry henry@zoo.toronto.edu
dl@ibiza.cs.miami.edu (David Lesher) (07/02/89)
> Article <1989Jul1.223548.27654@utzoo.uucp> From: henry@utzoo.uucp (Henry Spencer) # In article <860@corpane.UUCP> sparks@corpane.UUCP (John Sparks) writes: # >[A]-[D] are part of the touchtone standard but are presently unused. Ahhem, Not QUITE true. Autovon (the 4 wire military telephone system that somehow achieves standards of audio level, crosstalk, and dead connections previously available only with string and Dixie cups) uses them. They are labeled Priority, Immediate, Flash, and Flash Override. Their function is to bump some grunt off the net to allow the bigbrass to talk. FO is only for use of war or cold pizza at the General's house.
brian@ucsd.EDU (Brian Kantor) (07/03/89)
In an article, henry@utzoo.uucp (Henry Spencer) writes: >If you really want to embarrass a modem manufacturer, ask them if their >modems can dial A-D. (Some of them can't even dial "*" and "#"!) And then there's the USR 1200 bps modems we had here that dial a '#' when you tell them to dial a '*' and vice-versa. Newer firmware fixed that, but strangely enough that fix isn't on their list of firmware revisions. I'd be embarrased to admit it too. - Brian