Coding Audio signal

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. :wink:

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".