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lib/filters/oneeuro/OneEuro.md
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# OneEuro — One Euro Filter
# OneEuro — One Euro Filter
| Property | Value |
| ---------------- | -------------------------------- |
| **Category** | Filter |
| **Inputs** | Source (close) |
| **Parameters** | `minCutoff` (default 1.0), `beta` (default 0.007), `dCutoff` (default 1.0) |
| **Outputs** | Single series (OneEuro) |
| **Output range** | Tracks input |
| **Warmup** | `1` bars |
### TL;DR
- The **One Euro Filter** (1€ Filter) is a speed-adaptive first-order low-pass filter designed to balance jitter removal against responsiveness.
- Parameterized by `mincutoff` (default 1.0), `beta` (default 0.007), `dcutoff` (default 1.0).
- Output range: Tracks input.
- Requires `1` bars of warmup before first valid output (IsHot = true).
- Validated against TA-Lib, Skender, and Tulip reference implementations where available.
The **One Euro Filter** (1€ Filter) is a speed-adaptive first-order low-pass filter designed to balance jitter removal against responsiveness. It uses an adaptive cutoff frequency: at low signal speed, a low cutoff stabilizes the signal by reducing jitter; as speed increases, the cutoff rises to reduce lag.