---
title: IIRChannel
framework: Kernel
role: symbol
role_heading: Type Alias
platforms: [macOS 10.9+]
path: kernel/iirchannel
---

# IIRChannel

Constants that specify which channels a stereo biquadratic filter operates.

## Declaration

```occ
typedef int IIRChannel;
```

## Discussion

Discussion Pass an IIRChannel constant to vDSP_biquad2_CreateSetup to specify which channels the function applies filtering to.

## See Also

### Biquadratic Infinite Impulse Response (IIR) Filters

- [vDSP_biquad2](kernel/1532195-vdsp_biquad2.md)
- [vDSP_biquad2_CreateSetup](kernel/1532224-vdsp_biquad2_createsetup.md)
- [vDSP_biquad2_CopyState](kernel/1532220-vdsp_biquad2_copystate.md)
- [vDSP_biquad2_ResetState](kernel/1532215-vdsp_biquad2_resetstate.md)
- [vDSP_biquad2_DestroySetup](kernel/1532201-vdsp_biquad2_destroysetup.md)