title: IOS AVAudioRecorder, How to record only when audio input present (non-silence)
body: <p>I'm using AVAudioRecorder to record audio from the iphone's mic but I want to discard the silence periods: start recording when detecting sound, and stop recording when next silence.</p>
  
  <p>Can't figure out how to do that</p>
  
  <p>Any advice?</p>
  
  <p>Thanx!</p>