Hello, it is possible via the Arduino to generate an audio signal so that I can put information beyond and the incoming audio signal on 2 Arduino can convert the information back? Have in Forum has unfortunately nothing found.
Sorry, what???
Do you want to generate a tone and mix it with an existing audio signal? The Arduino is good at generating square waves, but it doesn't have a built-in digital-to-analog converter so it's not good at generating sine waves or outputting normal audio (by itself). If you want audio-out, you can add an audio shield or DAC.
For mixing two or more audio signals, use a summing amplifier. It's easy to build with an op-amp and it doesn't require programming.
Of course, audio mixing can be done digitally since it's summing and computers/microcontrollers are really good at addition! But, the Arduino isn't a particularly fast processor. And although it has an analog-to-digital converter, it's ADC is only 10-bits.
th3Khem:
Hello, it is possible via the Arduino to generate an audio signal so that I can put information beyond and the incoming audio signal on 2 Arduino can convert the information back? Have in Forum has unfortunately nothing found.
Which data rate?
For slow data rates: Use on/off keying with the "tone()" function.
If you want to know more about look up Wikipedia about "Morse code".