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lib/filters/roofing/Roofing.md
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# ROOFING: Ehlers Roofing Filter
# ROOFING: Ehlers Roofing Filter
| Property | Value |
| ---------------- | -------------------------------- |
| **Category** | Filter |
| **Inputs** | Source (close) |
| **Parameters** | `hpLength` (default 48), `ssLength` (default 10) |
| **Outputs** | Single series (ROOFING) |
| **Output range** | Tracks input |
| **Warmup** | 1 bar |
### TL;DR
- The **Roofing Filter** is John Ehlers' bandpass architecture designed specifically for oscillator construction.
- Parameterized by `hplength` (default 48), `sslength` (default 10).
- Output range: Tracks input.
- Requires 1 bar of warmup before first valid output (IsHot = true).
- Validated against TA-Lib, Skender, and Tulip reference implementations where available.
> "The trend is your friend until it overwhelms the signal. The noise is your enemy until you mistake it for alpha."