There used to be a DTMF decoder program on Wikipedia in C. I got it while it was still there and made it into a 160x120 pixel image receiver on my Sony PSP. It takes over one hour and forty seven minutes to send a picture at 20 digits per second, and MP3 encoding messes it up, so it's has no practical use. Frame Sync is "A", red line sync is "B" green line sync is "C" and blue line sync is "D". Sent as red line, green line, then blue line. Each pixel is lower 3 bits, then upper three bits.
@Amishman35 Hey, that sounds very interesting, by any chance would you know what the old wikipedia link was ? Or even better, would you still have the source code you got from wikipedia? I have many projects I want to build that include DTMF decoding for remote switching of devices. It would just be handy to have the code that I could adapt to work on my microcontroller. Thanks !
There is free software available to do this on your PC, and the input level threshold can be changed, I don't suppose this circuit can read DTMF with background noise.
helicop - At the time, I just thought it'd be a fun project. I decoded some tones in a few movies and songs. There are plenty of fun and legitimate uses for this, if you put your mind to it. I've thought about playing with my answering machine so that when I punch in a certain sequence, my server is turned on. (Remove wake-on LAN doesn't work :P ) I also considered getting into some basic rf projects where I use DTMF and a dial pad to control a small robot. The possibilities are endless!
Didn't know there was a single DTMF decoder IC made.. Interesting. Ever consider useing a PIC for this? all in one applications, includeing serial interface.
I can do that without a decoder. It's only 10 number tones and #,*. It makes me realize how simple it is to steal this info. Scary stuff. Thanks for the info.
There used to be a DTMF decoder program on Wikipedia in C. I got it while it was still there and made it into a 160x120 pixel image receiver on my Sony PSP. It takes over one hour and forty seven minutes to send a picture at 20 digits per second, and MP3 encoding messes it up, so it's has no practical use. Frame Sync is "A", red line sync is "B" green line sync is "C" and blue line sync is "D". Sent as red line, green line, then blue line. Each pixel is lower 3 bits, then upper three bits.
Amishman35 2 years ago
@Amishman35 Hey, that sounds very interesting, by any chance would you know what the old wikipedia link was ? Or even better, would you still have the source code you got from wikipedia? I have many projects I want to build that include DTMF decoding for remote switching of devices. It would just be handy to have the code that I could adapt to work on my microcontroller. Thanks !
stewartdahamman 1 year ago
There is free software available to do this on your PC, and the input level threshold can be changed, I don't suppose this circuit can read DTMF with background noise.
hrford 3 years ago
Hey... watch my video, Elba DTMF.
elba89 4 years ago
hey man would u be intrested in saleing me one of those
slimdizzle2000 4 years ago
helicop - At the time, I just thought it'd be a fun project. I decoded some tones in a few movies and songs. There are plenty of fun and legitimate uses for this, if you put your mind to it. I've thought about playing with my answering machine so that when I punch in a certain sequence, my server is turned on. (Remove wake-on LAN doesn't work :P ) I also considered getting into some basic rf projects where I use DTMF and a dial pad to control a small robot. The possibilities are endless!
fortschreiten 5 years ago
dude, what OS are u using?
justmejoey 3 years ago
Didn't know there was a single DTMF decoder IC made.. Interesting. Ever consider useing a PIC for this? all in one applications, includeing serial interface.
mikeandtiff 5 years ago
What exactly is this good for? I'm not being rude I'm actually interested....
helicop 5 years ago
Decoding phone banking information from a tapped phone line would be one use. Decoding touch tone number tones in general.
TOWCH 5 years ago
I can do that without a decoder. It's only 10 number tones and #,*. It makes me realize how simple it is to steal this info. Scary stuff. Thanks for the info.
helicop 5 years ago
It's also handy for decoding DTMF tones transmitted by via radio.
smitty291978 4 years ago