hi everbody,
i started a little project , which is about building a caller id circuit around an atmel 8bit mcu.
i don't plan to use any decoder chip nor module for that, the demodulation should be done on the microcontroller.
i found somewhere a good software based fsk demodulator for atmega8 i believe, though i don't think that the software part is that difficult (worst case : i use two mcu's )
i'm in the process of designing this thingy, and first started with the connection to the telephone line.
For debugging puropses , i plan to connect the phone line to the sound card so i could pick up easily any signals flowing through and hopefully do some digital processing in matlab
what do you advise me , specially regarding ratings , and protections i should use to connect my phone line to the sound card ?
comments / ideas / suggestions are welcome.
thanks in advance.
--
tewfik
i started a little project , which is about building a caller id circuit around an atmel 8bit mcu.
i don't plan to use any decoder chip nor module for that, the demodulation should be done on the microcontroller.
i found somewhere a good software based fsk demodulator for atmega8 i believe, though i don't think that the software part is that difficult (worst case : i use two mcu's )
i'm in the process of designing this thingy, and first started with the connection to the telephone line.
For debugging puropses , i plan to connect the phone line to the sound card so i could pick up easily any signals flowing through and hopefully do some digital processing in matlab
what do you advise me , specially regarding ratings , and protections i should use to connect my phone line to the sound card ?
comments / ideas / suggestions are welcome.
thanks in advance.
--
tewfik