Post by thread:Synchronous DTMF software

I "jumped the gun" on the synchronous detector DTMF decoder. I was testing synchronous detector software I had created for my employer and on my digital scope, it appeared to produce a stable output if an asynchronous input frequency came close to the sample frequency. I got so exited that I thought I'd discovered something really neat and simple that I got on the PICLIST and broadcasted it. It turned out on closer inspection, however that the timing of the output pulse was all over the place. Upon contemplating responses from the PICLIST, and what I already knew about (hardware) synchronous detectors, that I was just seeing a beat effect between the sample and input frequencies. I see no easy way to turn that into a useful output for a DTMF detector. The next time I open my mouth on the PICLIST, I will try not to open it wide enough to put my foot in it. Thanks for your patience and help.