play a sound every # of seconds

HTML

<input type="text" id="a"><input type="button" class='btn btn-primary' value="sec" id="s" onclick="out()">
<audio id="player" src="/files/wow.mp3"></audio>

Javascript

function out() {
  x = document.getElementById('a').value;
 intrvl = setInterval("sound(x)", x*1000);
}
i = 0;
function sound(x) 
{
  if(x == i)
    {
      clearInterval(intrvl);
    }
  i++;
  
 document.getElementById('player').play();
}