Decode the keys in DTMF using FFT

2020 3 22
1 个回答
更新时间：2021 6 14
5 次查看（30 天）

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UPDATE:
The problem was solved! See the first comment.
I need to detect the keys pressed in the wav file using the FFT. But I'm completely stuck with it, just don't know what to do. I have read that you can detect the tones with the help of Goertzel algorythm, but, again, I haven't found nor explanation for it nor any example of working code. With audioread I got the wave and created the plot of it, but what should I do next to identify the frequencies for each key and filnally the keys?
Can someone please share with me an algorithm how to solve this problem?

9 个评论
显示 7更早的评论 隐藏 7更早的评论

Pavel Musorsky
Pavel Musorsky 2020-3-23
Finally I have made it! I don't clearly understand it whole cause I used the documentation about Goertzel but it works!
IT JUST WORKS!
Remembering all the pain I got during creation of it I will leave it there. In hope that it will save someone in future.
Abigail Nwk
Abigail Nwk 2020-6-2
Thank you so much!! can i have the audiofile that you used ? the qwer.wav
Pavel Musorsky
Pavel Musorsky 2020-6-2
编辑：Pavel Musorsky 2020-6-2
Just use this site to create any sequence of keys and download the wav file.
https://www.audiocheck.net/audiocheck_dtmf.php
Then rename it appropriately and put it in the folder where your matlab code lies. I promise you the code will give you the same sequence.
Abigail Nwk
Abigail Nwk 2020-6-2
It finally worked!
I used other dtmf generators and couldn't get the same sequence. Now i tried with the generator you gave and it worked
Thank you
Pavel Musorsky
Pavel Musorsky 2020-6-2
My code is not an absolute solution and I still don't know how exactly it works. But did your generator have 9 keys or 16 like mine?
Abigail Nwk
Abigail Nwk 2020-6-6
The generators i used had 16 keys too. I need this for a project, and now that the code works i have to explain every instruction used
Muhammad Shafiq
Muhammad Shafiq 2020-9-1
Hi guys the code FFT.m is not running properly ,I have set the path of audio file properly. Need guidance in running FFT.m. Thanks
Pavel Musorsky
Pavel Musorsky 2020-9-1
Did you use the wav file? And does it lie in the same folder as your project?
Abdul Rahim Mohammad
编辑：Abdul Rahim Mohammad 2020-9-16
Hi Pavel,
I used the code with a wav file generated from your suggested link but the following error pops up:
Output argument "c" (and maybe others) not assigned during call to "FFT>detect".
Error in FFT (line 27)
KEYS = [KEYS,detect(val)];
Could you also specify how to use the mat file as well, as in how to use the generated wave file and your file?
I reckon this might be a incomplete code snippted since the function you made takes no input arguments, I am sorta new to MATLAB and this seems extemely out of place compared to python. Thanks!

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回答（1 个）

Leonardo Aquino
Leonardo Aquino 2021-6-14

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hi @Pavel Musorsky, i have a problem with the ejecution your code, i have this error:
Error using reshape
Size arguments must be real integers.
Error in fft (line 11)
dataS = reshape(data(1:height*width),width,height)

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