---
title: vDSP_biquadm_SetupD
framework: accelerate
role: symbol
role_heading: Type Alias
path: accelerate/vdsp_biquadm_setupd
---

# vDSP_biquadm_SetupD

A data structure that contains precalculated data for use by a double-precision, multichannel cascaded biquadratic filter function.

## Declaration

```swift
typealias vDSP_biquadm_SetupD = OpaquePointer
```

## See Also

### Creating a multichannel biquadratic filter setup

- [vDSP_biquadm_Setup](accelerate/vdsp_biquadm_setup.md)