---
title: pinkNoise
framework: sensorkit
role: symbol
role_heading: Instance Property
path: sensorkit/srphotoplethysmogramopticalsample/noiseterms-swift.struct/pinknoise
---

# pinkNoise

An estimate of the pink noise of the sensor.

## Declaration

```swift
let pinkNoise: Double
```

## Discussion

Discussion The total pink noise variance estimate in the normalizedReflectance signal (Normalized Units²).

## See Also

### Accessing noise terms

- [whiteNoise](sensorkit/srphotoplethysmogramopticalsample/noiseterms-swift.struct/whitenoise.md)
- [backgroundNoise](sensorkit/srphotoplethysmogramopticalsample/noiseterms-swift.struct/backgroundnoise.md)
- [backgroundNoiseOffset](sensorkit/srphotoplethysmogramopticalsample/noiseterms-swift.struct/backgroundnoiseoffset.md)