The time-code recievers I've seen all used the LM567 Tone decoder. I've also seen it used in a DTMF decoder but as it needed 7 or 8 of them I think there would be easier ways. It could also be used in simple IR systems that didn't require a coding system and just transmitted a squarewave. Oliver. ----- Original Message ----- From: Andrew Seddon To: Sent: Tuesday, September 05, 2000 1:43 PM Subject: [PIC]:Radio decode with PIC. Hi.. I am currently tring to learn radio electronics. I am taking the hard way around but can`t seem to find any information on this subject. Basically I have a radio circuit that is outputing audio data. I have setup a system to sample it all in, but that there is where I get stuck. I wish to decode it again into a bit stream. At first I used a data slicer but that proved very susceptable to interference, hence my wish for some psudo DSP. If it`s any use the modulation is basically just on and off ASK. I think some intereference is coming in and tipping the comparator over the edge so it detects a change. I was hoping DSP could average or something?? I am sure there is a well defined algo for this. Any help greatly appreciated. Even if somebody could point me in the right direction, I`m not looking to get my work done for me I just don`t want to re-invent the wheel! Cheers. Andrew Seddon. -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.