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# SHAPE_EQCOMP_FILTER_INDEX

> SHAPE_EQCOMP_FILTER_INDEX

Equalizer filters.

## Syntax

```cpp theme={null}
enum SHAPE_EQCOMP_FILTER_INDEX    
{  
    SHAPE_EQCOMP_FILTER_INDEX_A,  
    SHAPE_EQCOMP_FILTER_INDEX_B,  
    SHAPE_EQCOMP_FILTER_INDEX_C  
}  
```

## Constants

| Constant | Description |
| - | - |
| SHAPE\_EQCOMP\_FILTER\_INDEX\_A | First (A) biquad filter |
| SHAPE\_EQCOMP\_FILTER\_INDEX\_B | Second (B) biquad filter |
| SHAPE\_EQCOMP\_FILTER\_INDEX\_C | Third (C) biquad filter |

## Remarks

The equalizer is implemented as three serial biquad filters, designated as A, B, and C. The coefficients are stored in a [SHAPE\_EQCOMP\_CONTEXT](https://docs.xbox.com/reference/audio/shapeeqcompcontext/structs/shape_eqcomp_context.md) structure.

For more information, see [Equalization and compression](https://docs.xbox.com/build/console-features/audio/overviews/shape-overview.md#ID4ECF) in [Overview of SHAPE](https://docs.xbox.com/build/console-features/audio/overviews/shape-overview.md).

## Requirements

**Header:** shapeeqcompcontext.h

**Supported platforms:** XBOX One family consoles and XBOX Series consoles

## See also

[ShapeEqCompContext](https://docs.xbox.com/reference/audio/shapeeqcompcontext/shapeeqcompcontext_members.md)


## Related topics

- [SetShapeEqCompFilterCoefficients](https://docs.xbox.com/reference/audio/shapeeqcompcontext/functions/setshapeeqcompfiltercoefficients.md)
- [GetShapeEqCompFilterCoefficients](https://docs.xbox.com/reference/audio/shapeeqcompcontext/functions/getshapeeqcompfiltercoefficients.md)
- [SetShapeEqCompFilterTargetCoefficients](https://docs.xbox.com/reference/audio/shapeeqcompcontext/functions/setshapeeqcompfiltertargetcoefficients.md)
- [GetShapeEqCompFilterTargetCoefficients](https://docs.xbox.com/reference/audio/shapeeqcompcontext/functions/getshapeeqcompfiltertargetcoefficients.md)
- [SetShapeEqCompRawFilterCoefficients](https://docs.xbox.com/reference/audio/shapeeqcompcontext/functions/setshapeeqcomprawfiltercoefficients.md)