Article View: sci.electronics
Article #15190Re: DTMF Decoder (I know -- "AGAIN?")
From: pauls
Date: Fri, 20 Nov 1992 17:46
Date: Fri, 20 Nov 1992 17:46
24 lines
1254 bytes
1254 bytes
I will assume that you can solder, wire-wrap or whatever.... 1) Decoders come in 2 flavors: "toll-quality" and "regular". The toll-quality decoders (ie more $$$) have the following traits: - better "talk-off". This is rejecting talking for DTMF tones - better dial-tone rejection - better "twist" reception. Twist is a stupid name for the amplitude difference between the dual-tones. Usually this is around 2-3 dB. THe leader of "toll-quality" chips is Teltone, with Mitel a close second. 2) The second-teir folks are good enough for home projects. The leader there is Silicon Systems, with other chips like Sierra Semi. If you want a schematic, then send me a SASE. I will provide circuits for all known DTMF chips! \ Paul Schreiber 200 Taylor St. #6244 Fort Worth, TX 76102 No SASE, no dice!
Technical Details
Message-ID:
<288200030@trsvax>Path:
arc1-ca.pugleaf.net!sparky!uunet!cs.utexas.edu!usc!sol.ctr.columbia.edu!eff!news.oc.com!utacfd.uta.edu!trsvax!trsvax!paulsReferences:
<19415834@<92323>Show Full Headers
Complete Article Headers
From: pauls@trsvax.tandy.com Date: 20 Nov 92 11:46 CST Newsgroups: sci.electronics Subject: Re: DTMF Decoder (I know -- "AGAIN?") Message-ID: <288200030@trsvax> Path: arc1-ca.pugleaf.net!sparky!uunet!cs.utexas.edu!usc!sol.ctr.columbia.edu!eff!news.oc.com!utacfd.uta.edu!trsvax!trsvax!pauls Nf-ID: #R:<92323:19415834:trsvax:288200030:000:801 Nf-From: trsvax.tandy.com!pauls Nov 20 11:46:00 1992 References: <19415834@<92323> Lines: 26