How to start recording when detecting sound, and stop recording when detect silence?
Run the voice recorder app on your iPhone or iPad. Tap the More Menu (three vertical dots), you can then find the option Start Recording at the Scheduled Time. And then touch the Record button at the bottom left to firstly choose Start Time, then press Continue to to choose End Time. Finally press Record button.
To do this, you should take a look at VAD algorithm, this is not that much pretty easy.
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