> ## Documentation Index
> Fetch the complete documentation index at: https://docs.xbox.com/llms.txt
> Use this file to discover all available pages before exploring further.

# FFT8

> FFT8

Fast Fourier Transform with eight samples.

## Syntax

```cpp theme={null}
void FFT8(  
         XMVECTOR* __restrict pReal,  
         XMVECTOR* __restrict pImaginary,  
         const size_t uCount= 1  
)  
```

### Parameters

*pReal*   \_Inout\_updates\_(uCount \* 2)\
Type: XMVECTOR\* \_\_restrict

Real components of the FFT. Must have at least *uCount* × 2 elements.

*pImaginary*   \_Inout\_updates\_(uCount \* 2)\
Type: XMVECTOR\* \_\_restrict

Imaginary components of the FFT. Must have at least *uCount* × 2 elements.

*uCount*   \_In\_\
Type: size\_t

Number of FFT iterations.

### Return value

Type: void

None.

## Remarks

For FFTs with a number of samples that are less than or equal to 16, use [FFT16](https://docs.xbox.com/reference/audio/xdsp/functions/fft16.md), [FFT8](https://docs.xbox.com/reference/audio/xdsp/functions/fft8.md), or [FFT4](https://docs.xbox.com/reference/audio/xdsp/functions/fft4.md).

All buffer parameters must be 16-byte aligned. Audio data must be FLOAT32 mono.

## Requirements

**Header:** xdsp.h

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

## See also

[xdsp](https://docs.xbox.com/reference/audio/xdsp/xdsp_members.md)


## Related topics

- [FFT](https://docs.xbox.com/reference/audio/xdsp/functions/fft.md)
- [FFT16](https://docs.xbox.com/reference/audio/xdsp/functions/fft16.md)
- [FFT4](https://docs.xbox.com/reference/audio/xdsp/functions/fft4.md)
- [FFTInitializeUnityTable](https://docs.xbox.com/reference/audio/xdsp/functions/fftinitializeunitytable.md)
- [XDSP](https://docs.xbox.com/reference/audio/xdsp/xdsp_members.md)