Recording and analyzing sound

Hi @Gordon,

I have following use-cases.

• Client requests an average frequency for the last N seconds.

  var clipSeconds=5, currentSecond=0, sBuff=new Uint8Array(clipSeconds);
  var w = new Waveform(512,{doubleBuffer:true,bits:16}­);
  var a = new Uint16Array(512);
  w.on("buffer", function(buf) {
  a.set(buf);
  E.FFT(a);
  var m=0,n=-1;
  for (var i=150;i<250;i++)if(a[i]>n)n=a[m=i];
  sBuff[currentSecond]=m.toFixed(0);
  console.log(sBuff[currentSecond]+"Hz @ "+n);
  currentSecond++;
  if (currentSecond >= clipSeconds) {
  w.stop();
  var avg = E.sum(sBuff)/clipSeconds;
  console.log("Average " + avg.toFixed(0) + " Hz");
  }
  });
  w.startInput(D2,512,{repeat:true});
  

This code is tested and working on firmware (1v92)

• Client requests an audio for the last N seconds.

  var clipSeconds = 5;
  var w = new Waveform(512*clipSeconds,{bits:16});
  w.on("finish", function(buf) {
  console.log(buf.length);
  });
  w.startInput(D2,512);
  

For ought I see the "buf" contains the audio which should be stored and send to the client ?

I really appreciate your feedback!

Thank you.