---
title: "init(coefficients:channelCount:sectionCount:ofType:)"
framework: accelerate
role: symbol
role_heading: Initializer
path: "accelerate/vdsp/biquad/init(coefficients:channelcount:sectioncount:oftype:)"
---

# init(coefficients:channelCount:sectionCount:ofType:)

Creates a new single-channel or multichannel cascaded biquad IIR structure.

## Declaration

```swift
init?(coefficients: [Double], channelCount: vDSP_Length, sectionCount: vDSP_Length, ofType: T.Type)
```