title: Audio analysis to detect human voice, gender, age and emotion -- any prior open-source work done?
body: <p>Is there prior open-source work done in the field of 'Audio analysis' to detect human-voice (say in spite of some background noise), determine speaker's gender, possibly determine no. of speakers, age of speaker(s), and the emotion of speakers?</p>
  
  <p>My hunch is that the speech recognition software like CMU Sphinx could be a good place to start, but if there's something better, it'd be great.</p>