Path: utzoo!attcan!uunet!van-bc!sl
From: sl@van-bc.UUCP (pri=-10 Stuart Lynne)
Newsgroups: sci.electronics
Subject: Re: DTMF (Touch-Tone) --> RS-232 Conversion
Keywords: DTMF, RS-232, Touch-Tone, Please Help!
Message-ID: <2178@van-bc.UUCP>
Date: 26 Jan 89 05:50:24 GMT
References: <1441@thumper.bellcore.com> <7139@pyr.gatech.EDU>
Reply-To: sl@van-bc.UUCP (pri=-10 Stuart Lynne)
Organization: Wimsey Associates, Vancouver, BC.
Lines: 22

In article <7139@pyr.gatech.EDU> byron@pyr.UUCP (Byron A Jeff) writes:
>-attempting to build a DTMF (Touch-Tone) --> RS-232 converter.  I've seen the

>I helped build a DTMF decoder for a school project last quarter. I also
>-SSI-204 IC's.  Who makes these (Samsung?), and what is the difference between

Now that we can decode DTMF, how hard would it be to add some functionality
to product a dial tone. 

For example the device should go offhook when "DTR" is raised. A dial tone is 
produced when RTS goes high and DTMF recogition starts.

Dial tone should disappear after first digit typed, or when RTS is dropped
(whichever comes first).

It would also be nice to be able to plug this in between a modem and phone
line, so the ability to make modem think the phone is ringing after you have
gathered data from person would be nice. (It could also be between modem and
computer serially so you wouldn't need a second serial port for it). 

-- 
Stuart.Lynne@wimsey.bc.ca {ubc-cs,uunet}!van-bc!sl     Vancouver,BC,604-937-7532