AudioContext.createBiquadFilter()

var audioCtx = new AudioContext();
var biquadFilter = audioCtx.createBiquadFilter();

一个 BiquadFilterNode.

这个例子展示了一个利用AudioContext 创建四项滤波器节点（ Biquad filter node）的例子。想要查看完整工作的示例，请查看我们的For voice-change-o-matic 样例 （也可以查看  源码 ）.

var audioCtx = new (window.AudioContext || window.webkitAudioContext)();

//set up the different audio nodes we will use for the app
var analyser = audioCtx.createAnalyser();
var distortion = audioCtx.createWaveShaper();
var gainNode = audioCtx.createGain();
var biquadFilter = audioCtx.createBiquadFilter();
var convolver = audioCtx.createConvolver();

// connect the nodes together

source = audioCtx.createMediaStreamSource(stream);
source.connect(analyser);
analyser.connect(distortion);
distortion.connect(biquadFilter);
biquadFilter.connect(convolver);
convolver.connect(gainNode);
gainNode.connect(audioCtx.destination);

// Manipulate the Biquad filter

biquadFilter.type = "lowshelf";
biquadFilter.frequency.value = 1000;
biquadFilter.gain.value = 25;

• Using the Web Audio API