Creating an audio context

// for cross browser compatibility
const AudioContext = window.AudioContext || window.webkitAudioContext;
const audioCtx = new AudioContext();

The “sweep” — oscillators, periodic waves, and envelopes

Playing the audio in time

let tempo = 60.0;
const bpmControl = document.querySelector('#bpm');
bpmControl.addEventListener('input', function() {tempo = Number(this.value);
}, false);

let lookahead = 25.0; // How frequently to call scheduling function (in milliseconds) 轮训scheduling function
let scheduleAheadTime = 0.1; // How far ahead to schedule audio (sec) 提前多久设置audio

let currentNote = 0;
let nextNoteTime = 0.0; // when the next note is due.function nextNote() {const secondsPerBeat = 60.0 / tempo;//每一个beat持续的时间nextNoteTime += secondsPerBeat; // Add beat length to last beat timecurrentNote++; //递进到下一个noteif (currentNote === 4) {// 每4个一循环currentNote = 0;}
}

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Advanced techniques: creating sound, sequencing, timing, scheduling

Creating an audio context

The “sweep” — oscillators, periodic waves, and envelopes

Playing the audio in time

Advanced techniques: creating sound, sequencing, timing, scheduling相关推荐

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