Continuous Audio recording in Java via line-in or microphone inputs

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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?

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fjch100 On BEST ANSWER

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??