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.

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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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