Technical explanation for observation? (Simultaneous microphone access)

I have made an observation in Android Marshmallow (I know, not the newest, but I still want to find answers to this mystery):

  • Audio recording (using com.nll.asr) blocks video recording.
  • Audio recording during phone call is possible.


My question is:
How come (technically) that the telephone application is able to access the microphone simultaneously with the voice recorder, while the camera can not?

What is the technical reason for that?



——————————————–
Trivial observation: In Android 4.4.2, the audio recorder and torch app keeps the LED on and the ASR voice recorder keeps recording during shutdown.

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