Would it be possible to monitor the mic input of a sound card to record audio when audio is actually "heard"/present? Mic input comes from a VHF radio speaker output, so audio will only be "present" when radio transmissions are received. If possible, how could this be achieved in Java?
Continuous Audio recording in Java via line-in or microphone inputs
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What about using a microcontroller to look for the signal receive strenght and when the signal is over the threshold just sent a signal to "record" the audio??