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Decoding DTMF Tones

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jknightandkarr
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Decoding DTMF Tones

Postby jknightandkarr » Sat Apr 17, 2021 3:29 pm

I am in need to decode DTMF tones from an audio sample and wondered whats the best option to do this? I found this website [url]http://www.snrelectronicsblog.com/8051/dtmf-keypad/
[/url] and saw a decoder circuit, but I really want to avoid building a circuit with a chip, such as this: https://media.digikey.com/pdf/Data%20Sheets/Rohm%20PDFs/BU8874(F).pdf, that I really will never use minus getting the correct tones and length off of tv show clips. I figured my digital oscilloscope or my logic analyzer will give me the best readings, but would it be as simple as using a low and high pass filters to separate them into 2 different channels to get the information that i need. Thanks.

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Re: Decoding DTMF Tones

Postby Savage///Circuits » Sun Apr 18, 2021 2:19 am

I'm a bit confused...are you trying to capture this information in real-time continuously? Or do you have a single sample that you want to extract the information from? If the latter, you could probably use audio software such as Audacity.

https://manual.audacityteam.org/man/plot_spectrum.html

If the former, there used to be Integrated Circuits designed to do that. Parallax used to sell one back in 2000. Or you could use a Propeller Chip and write some code to extrapolate the two frequencies.
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Re: Decoding DTMF Tones

Postby jknightandkarr » Fri Apr 23, 2021 5:14 pm

No, just trying to get data on the tone used as well as timing from samples from Knight Rider to use to make the various electronics used in KITT and KARR. I am going to use the Propeller to reproduce them. Currently working on the voice box part of the dash.

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