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lib/filters/usf/Usf.md
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# USF: Ehlers Ultimate Smoother Filter
# USF: Ehlers Ultimate Smoother Filter
| Property | Value |
| ---------------- | -------------------------------- |
| **Category** | Filter |
| **Inputs** | Source (close) |
| **Parameters** | `period` |
| **Outputs** | Single series (Usf) |
| **Output range** | Tracks input |
| **Warmup** | `period` bars |
### TL;DR
- The Ultimate Smoother Filter (USF) is a zero-lag smoothing filter introduced by John Ehlers in the April 2024 issue of *Technical Analysis of Stock...
- Parameterized by `period`.
- Output range: Tracks input.
- Requires `period` bars of warmup before first valid output (IsHot = true).
- Validated against TA-Lib, Skender, and Tulip reference implementations where available.
> "The Ultimate Smoother achieves superior smoothing by subtracting high-frequency components using a high-pass filter, resulting in zero lag in the passband."