IIRFilterNode | Web API

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IIRFilterNode 接口在 Web 音频 API 是 AudioNode processor which implements a general infinite impulse response (IIR) filter; this type of filter can be used to implement tone control devices and graphic equalizers as well. It lets the parameters of the filter response be specified, so that it can be tuned as needed.

输入数	`1`
输出数	`1`
通道计数模式	`"max"`
通道计数	如同输入
通道解释	`"speakers"`

Typically, it's best to use the BiquadFilterNode interface to implement higher-order filters. There are several reasons why:

Biquad filters are typically less sensitive to numeric quirks.
The filter parameters of biquad filters can be automated.
All even-ordered IIR filters can be created using BiquadFilterNode .

However, if you need to create an odd-ordered IIR filter, you'll need to use IIRFilterNode . You may also find this interface useful if you don't need automation, or for other reasons.

Once the node has been created, you can't change its coefficients.

IIRFilterNode s have a tail-time reference; they continue to output non-silent audio with zero input. As an IIR filter, the non-zero input continues forever, but this can be limited after some finite time in practice, when the output has approached zero closely enough. The actual time that takes depends on the filter coefficients provided.

构造函数

IIRFilterNode()

特性

This interface has no properties of its own; however, it inherits properties from its parent, AudioNode .

方法

继承方法来自其父级 AudioNode . It also has the following additional methods:

getFrequencyResponse()

范例

You can find a simple IIR filter demo live on Codepen . Also see the source code on GitHub . It includes some different coefficient values for different lowpass frequencies — you can change the value of the filterNumber constant to a value between 0 and 3 to check out the different available effects.

Also see our Using IIR filters guide for a full explanation.

规范

规范	状态	注释
Web 音频 API The definition of 'IIRFilterNode' in that specification.	工作草案	Initial Definition

浏览器兼容性

The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request. 更新 GitHub 上的兼容性数据

	桌面						移动
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
`IIRFilterNode`	Chrome 49	Edge ≤18	Firefox 50	IE 不支持 No	Opera 36	Safari ?	WebView Android 49	Chrome Android 49	Firefox Android 50	Opera Android 36	Safari iOS ?	Samsung Internet Android 5.0
`IIRFilterNode()` 构造函数	Chrome 55 注意事项 55 注意事项 Before version 59, the default values were not supported.	Edge ≤79	Firefox 53	IE 不支持 No	Opera 42	Safari ?	WebView Android 55 注意事项 55 注意事项 Before version 59, the default values were not supported.	Chrome Android 55	Firefox Android 53	Opera Android 42	Safari iOS ?	Samsung Internet Android 6.0 注意事项 6.0 注意事项 Before Samsung Internet 7.0, the default values were not supported.
`getFrequencyResponse`	Chrome 49	Edge 14	Firefox 50	IE 不支持 No	Opera 36	Safari ?	WebView Android 49	Chrome Android 49	Firefox Android 50	Opera Android 36	Safari iOS ?	Samsung Internet Android 5.0

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