javascript - Web Audio APIs - Capture audio - Disable low pass filter -

i use tutorial: http://typedarray.org/from-microphone-to-wav-with-getusermedia-and-web-audio/

and live demo page: http://typedarray.org/wp-content/projects/webaudiorecorder/

to create high frequency analyzer.

my problem web audio api, thing, default cut off high frequencies.

when record wav , play 10000hz signal, wav contain freq.

if play 17000hz signal, wav don't contain freq.

how disable low pass filter?

code:

function success(e){     // creates audio context     audiocontext = window.audiocontext || window.webkitaudiocontext;     context = new audiocontext();      // creates gain node     volume = context.creategain();      // creates audio node microphone incoming stream     audioinput = context.createmediastreamsource(e);      // connect stream gain node     audioinput.connect(volume);      /* spec: value controls how audioprocess event      dispatched , how many sample-frames need processed each call.      lower values buffer size result in lower (better) latency.      higher values necessary avoid audio breakup , glitches */     var buffersize = 2048;     recorder = context.createjavascriptnode(buffersize, 2, 2);      recorder.onaudioprocess = function(e){         console.log ('recording');         var left = e.inputbuffer.getchanneldata (0);         var right = e.inputbuffer.getchanneldata (1);         // clone samples         leftchannel.push (new float32array (left));         rightchannel.push (new float32array (right));         recordinglength += buffersize;     }      // connect recorder     volume.connect (recorder);     recorder.connect (context.destination);  } 

this in getusermedia , not web audio api. default, mediastream getusermedia gives contains data has been (depending on browser): - echo cancelled - had noise suppressed - had automatic gain compensation applied

you can disable using constraints (for example, firefox):

navigator.mediadevices.getusermedia({audio: { echocancellation: false, moznoisesuppression: false, mozautogaincontrol: false });

we standardizing properties, we're not done yet.