Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Posting-Version: version Vortex 1.1 8/4/83; site vortex.UUCP
Path: utzoo!linus!decvax!vortex!lauren
From: lauren@vortex.UUCP (Lauren Weinstein)
Newsgroups: net.dcom,net.wanted
Subject: Touch-Tone to ASCII
Message-ID: <181@vortex.UUCP>
Date: Sun, 13-Nov-83 01:18:19 EST
Article-I.D.: vortex.181
Posted: Sun Nov 13 01:18:19 1983
Date-Received: Thu, 10-Nov-83 02:18:01 EST
Organization: Vortex Technology, Los Angeles
Lines: 13

"Teltone" makes a very nice single chip DTMF (Touch-Tone) receiver
chip which only requires a standard colorburst crystal to operate.
The chip itself is relatively inexpensive, and at least part of the
time some distributers offer a package of the chip and crystal for
the price of the chip alone.

Teltone Application Guide SC-1 contains a very complete discussion
of DTMF and includes a number of schematics for interfacing their
M-947 DTMF receiver chip to telephone systems.  The guide also
includes a schematic for a complete DTMF to ASCII conversion
system using only three primary chips (M-947, a PROM, and a UART).

--Lauren--