title: Detect multiple voices without speech recognition
body: <p>Is there a way to just detect in realtime if there are multiple people speaking? Do I need a voice recognition api for that?</p>
  
  <p>I don't want to separate the audio and I don't want to transcribe it either. My approach would be to frequently record using one mic (-> mono) and then analyse those recordings. But how then would I detect und distinguish voices? I'd narrow it down by looking only at relevant frequencies, but then...</p>
  
  <p>I do understand that this is no trivial undertaking. That's why I do hope there's an api out there capable of doing this out of the box - preferably an mobile/web-friendly api.</p>
  
  <p>Now this might sound like a shopping list for Christmas but as mentioned I do not need to know anything about the content. So my guess is that a full fledged speech recognition would have a high toll on the performance.    </p>