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# vDSP_biquadm_CopyState

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

```
extern 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

Both `src` and `dest` objects must be valid single-precision multichannel biquad setup objects created by previous calls to <doc://com.apple.documentation/documentation/kernel/1579945-vdsp_biquadm_createsetup>, and both objects must have the same number of channels and sections.

---

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