AudioContext.createBiquadFilter()

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since April 2021.

AudioContext 的createBiquadFilter() 方法创建了一个 BiquadFilterNode, 它提供了一个可以指定多个不同的一般滤波器类型的双二阶滤波器。

语法

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

返回

一个 BiquadFilterNode.

示例

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 ）.

js
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;

规格

Specification
Web Audio API
# dom-baseaudiocontext-createbiquadfilter

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