Havoc

DTMF decoder

19 posts in this topic

I'm looking for good/reliable software for decoding DTMF signals within audio files, mp3 preferred. I used to work with Spectrum Analyzer Law Enforcement which has very nice interface but operates only on wav files and mostly sux on decoding. Can you recommend me something better for Windows platform ?

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http://www.teworks.com/dtmf.htm

Download the executable and load a .wav file.

I have no luck. This software supports only mono files with sample rate 11025, 22050, 44100. I'm not going to convert every single file to comply with this software.

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call up the bellsmind pbx and play the tones to the dtmf decoder.

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call up the bellsmind pbx and play the tones to the dtmf decoder.

Natas ! please save it ... do you think I don't know that Bellsmind PBX has this feature. I am asking for software because it is horribly inconvenient to record more than 50 files, go to payphone, play one by one and note down what was decoded. We have winter right here bro.

Once again

I'm looking for good/reliable software
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I suggest learning the tones.. I can't be too hard especially if you play an instrument.. But I looked for a DTMF decoder and I turned up with some program that would only spit out 1234567890*#ABCD no matter what.. some times if would ge it but it would be in the middle of the rest.. so I just stopped.

Edit: forgot the 0.

Edited by ennui
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We have winter right here bro.

We do here too.

I thought you had VoIP or something, where you could call into the US and do this easily?

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as I said

I used to work with Spectrum Analyzer Law Enforcement
which is a product of PAS. This software analyzes dtmf in the same way as every single program of this company. I'm sorry but it is not as good as I need it to be or I'm lame and can't configure it properly.

I know this one and even recommended in other thread

Download this file

http://hdd001.republika.pl/sample.wav and test on your decoder

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I wrote a touch tone decoder a while back. It was my first attempt ever at DSP code so it's not the best but I'll run it through there this afternoon and tell you what I get.

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I always used to do it manually with Cool Edit Pro 2.0. Just analyze which frequencies are the most prevalent. There are two hence the term Dual Tone Multi Frequency. Looking at the peak frequencies on the graph in that program, I would get it right most of the time.

It is too bad you can't get a pager anymore (or can you?). You just dial the pager and then play the tones through the phone. Your pager would tell you what numbers were dialed.

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I always used to do it manually with Cool Edit Pro 2.0.  Just analyze which frequencies are the most prevalent.

Most often there are problems because dtmf can be 'different' played fast or slow with or without the noise. Wouldn't it be better to have computer analyzing it for you ?

It is too bad you can't get a pager anymore (or can you?).

You can get touch tone decoder that looks like a pager

DTMFhand.gif

http://www.optoelectronics.com/microdtmf.htm

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I had (have?) that Optoelectronics device. It's a neat toy but be gentle on the battery compartment cover. It breaks in two seconds if you're not careful. It was REALLY poorly manufactured when it first came out but hopefully that's changed.

What m2mike is saying though is that if you had a real pager with service you can just dial up your pager and play the tones to it. When you hang up the pager system will decode the tones for you and send them to your pager. We used to do this all the time back in the day when pagers were around and standalone DTMF decoders were expensive.

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There's still a few pager companies out there, though most of them have either been gobbled up by or abandoned in favor of cell phones. There's still a lot of people for whom a pager is a much better alternative to a cell phone and some old farts who refuse to give up an old technology until it's been beaten into the ground *cough*.

The Abstruse One

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i can do the pager thing with my cell phone- u call it up, press 5 (depending on service, i have att wireless), and play the tones (if you dont do any, it will just send your cpn)

pretty cool.. is that what yall are talking about?

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I've searched the net all the day today and tested dozen of decoding programs. We still have no winner but there are a few interesting positions.

1. There is a WinTone - decodes from wav files

WinTone was designed to be able to decode virtually any set of tones, regardless of their frequency. And since there are so many different Tonesets (DTMF, CCIR, ZVEI, EIA, EEA, etc.) we decided to make WinTone modular. If you need to be able to decode a different standard, simply copy that DLL into the WinTone directory and you instantly have access to tone decoding.. That simple.

download here http://www.personainternet.com/~northscan/wintn22.zip

manual here http://vk6hgr.echidna.id.au/warsug/tutoria...ntonemanual.pdf

I can't force this software to decode properly.

2. Programs that decode from input/mic in soundcard

http://www.g6lvb.com/Articles/SSETI%20Expr...MF%20Telemetry/

http://www.qsl.net/kb5ryo/dtmf.htm

The first one is almost good, it doesn't require specified audio format and detects almost all digits.

3. On-line decoder

http://www.dialabc.com/sound/detect/

works and looks very nice but can't decode properly

I think it is not so hard to write such piece of software. There are accessible samples/plugins/sources, for example in Java :

http://www.musicdsp.org/showone.php?id=156

So I think using FFT method it shall be possible to create mutli-platfom universal decoder for phreaking purposes. It shall decode the audio stream sent to audio card and perform real time decoding

For testing purposes I recommend mine wave files and samples from Spectrum Analyzer Law (can share)

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From time to time I still run into things like "please enter your numerical message after the tone, BEEP" while scanning. I assume that these are pagers.

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as I said

I used to work with Spectrum Analyzer Law Enforcement
which is a product of PAS. This software analyzes dtmf in the same way as every single program of this company. I'm sorry but it is not as good as I need it to be or I'm lame and can't configure it properly.

I know this one and even recommended in other thread

Download this file

http://hdd001.republika.pl/sample.wav and test on your decoder

sorry sometimes you just ramble on like a girl so I tend not to read all of your post.My bad for linking you to something you have already used.I know I would just convert the shit to work with Spectrums shit.PEace Havoc

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