サンプルレートとビットレートを設定してmp3オーディオを録音するhtml5

/*
    The sampling frequency of MP3 is divided into 48000 44100 32000 24000 22050 16000 12050 8000

    Bitrate values against real audio (for reference only)
　　16Kbps = telephone sound quality
　　24Kbps = increased telephone quality, shortwave broadcast, longwave broadcast, European standard medium wave broadcast
　　40Kbps = U.S. medium wave broadcast
　　56Kbps=voice
　　64Kbps=increased voice (best bit rate setting for cell phone ringtones, best setting for cell phone mono MP3 players)
　　112Kbps=FM FM stereo broadcast
　　128Kbps=Tape (best setting for cell phone stereo MP3 players, best setting for low-grade MP3 players)
　　160Kbps=HIFI hi-fi (best setting for mid- to high-grade MP3 players) 　
  　192Kbps=CD (best setting for high-grade MP3 players)
　　256Kbps=Studio Music Studio (for music enthusiasts)
*/

//the only parameter that affects the size of mp3 files is bitRate
//sampleRate is only for people with special needs
var recorder = new MP3Recorder({
    //numChannels: 1, //number of channels, default is 1
    //sampleRate: 8000, //sample rate, usually provided by the device, such as 48000
    bitRate: 64, //bitrate, do not go below 64, or you may record no sound (vocals)

    //recording end event
    complete: function (data, type) {
        //blob is mp3 audio data
        var blob = new Blob(data, { type: type });
    }
});

//Start recording
recorder.start(onSuccess, onError);

//Stop recording
recorder.stop();

//pause recording
recorder.pause();

//resume recording
recorder.resume();