---
title: vDSP_biquadm_CopyState
framework: Kernel
role: symbol
role_heading: Function
platforms: [macOS 10.9+]
path: kernel/1579980-vdsp_biquadm_copystate
---

# vDSP_biquadm_CopyState

Copies the filter state from one single-precision multichannel biquad IIR filter object to another.

## Declaration

```occ
void vDSP_biquadm_CopyState(vDSP_biquadm_Setup __dest, const struct vDSP_biquadm_SetupStruct *__src);
```

## Parameters

- `__dest`: The vDSP_biquadm_Setup object whose state you wish to overwrite.
- `__src`: The vDSP_biquadm_SetupStruct object whose state you wish to copy.

## Discussion

Discussion Both src and dest objects must be valid single-precision multichannel biquad setup objects created by previous calls to vDSP_biquadm_CreateSetup. Both objects must have the same number of channels and sections.