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# vDSP_biquadm_SetCoefficientsDoubleD

Sets the double-precision coefficients of the specified double-precision, multichannel biquadratic filter setup object.

```
extern void vDSP_biquadm_SetCoefficientsDoubleD(vDSP_biquadm_SetupD __setup, const double *__coeffs, vDSP_Length __start_sec, vDSP_Length __start_chn, vDSP_Length __nsec, vDSP_Length __nchn);
```

## Parameters

`__setup`

The biquadratic filter setup object that the function updates.

`__coeffs`

A pointer to the new coefficients.

`__start_sec`

The first section that the function updates.

`__start_chn`

The first channel that the function updates.

`__nsec`

The number of sections that the function updates.

`__nchn`

The number of channels that the function updates.

## Discussion

Use this function to update sections of coefficient values of a biquadratic setup structure. This function doesn’t allocate new memory. The range that you specify using `__start_sec` and `__nsec` must be within the number of sections that you define in the create setup function.

---

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