---
title: vDSP_biquadm_SetActiveFilters
framework: Kernel
role: symbol
role_heading: Function
platforms: [macOS 10.11+]
path: kernel/1579973-vdsp_biquadm_setactivefilters
---

# vDSP_biquadm_SetActiveFilters

Sets the overall active/inactive filter state of a valid single-precision multichannel biquad IIR filter setup of type vDSP_biquadm_Setup.

## Declaration

```occ
void vDSP_biquadm_SetActiveFilters(vDSP_biquadm_Setup __setup, const bool *__filter_states);
```

## Parameters

- `__setup`: The setup object to modify.
- `__filter_states`: An input array of bool values. The length of this array should be the number of filters configured in setup.

## Discussion

Discussion For each filter configured in setup, the corresponding value in filter_states sets the filter to its active or inactive state. The function removes any inactive filters from the biquad processing chain. The inactive filters retain their state if you activate them later.