DTMF decoding from samples

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3 total messages Started by Capt. Sarcastic Thu, 28 Jan 1993 07:59

#4407

Author: Capt. Sarcastic
Date: Thu, 28 Jan 1993 07:59

14 lines
955 bytes

Does anyone know of a program that will analyze a sample and produce
the touch-tone(tm) numbers?

For instance, someone dials 777-0923 on their phone.  I take the sample
and run it through said program.  It prints on the screen:

7 7 7 0 9 2 3

Well?  I don't know enough to do this myself.

--
Capt. Sarcastic      |The U.S. economy is dominated by monopolies.  In order to
(Kurt S. Koller)     |gain higher profits they exploit the U.S. workers as well
kkoller@nyx.cs.du.edu|as the population of the countries dependent on the U.S.A.

Re: DTMF decoding from samples

#4421

Author: Screwtape
Date: Thu, 28 Jan 1993 18:41

12 lines
777 bytes

>Does anyone know of a program that will analyze a sample and produce
>the touch-tone(tm) numbers?

No,  but I do know that USR dual standards can do this.  at%t, I think.
If you recorded the DTMF and ran it into the mic if the phone,
It should work... 

---

Chris Turkstra
Turkstra@cs.hope.edu
Traveling the Internet with a load not properly tied down.

Re: DTMF decoding from samples

#4455

Author: Paul Rubin
Date: Fri, 29 Jan 1993 02:33

9 lines
995 bytes

Such a program is listed in one of the TI DSP application books.
It's written in TMS 320 assembler so you'll have to translate it.
It uses Goertzel's algorithm (see Oppenheim and Schaefer, 
_Discrete Time Signal Processing_), which is a clever hack
for implementing several digital filters in parallel, sort of.

Really, decoding touch tones is a simple problem in digital
filtering that a current PC should be able to handle without much
sweat without having to go out and buy a modem...

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