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Miha Kralj
2026-02-27 07:48:12 -08:00
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lib/filters/butter2/Butter2.md
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# BUTTER2: Ehlers 2-Pole Butterworth Filter
# BUTTER2: Ehlers 2-Pole Butterworth Filter
| Property | Value |
| ---------------- | -------------------------------- |
| **Category** | Filter |
| **Inputs** | Source (close) |
| **Parameters** | `period` |
| **Outputs** | Single series (Butter2) |
| **Output range** | Tracks input |
| **Warmup** | `4 * period` bars |
### TL;DR
- The 2-Pole Butterworth Filter (BUTTER2) is a signal processing tool designed to provide maximally flat frequency response in the passband.
- Parameterized by `period`.
- Output range: Tracks input.
- Requires `4 * period` bars of warmup before first valid output (IsHot = true).
- Validated against TA-Lib, Skender, and Tulip reference implementations where available.
> "Maximally flat frequency response in the passband."