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Miha Kralj
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lib/filters/spbf/Spbf.md
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# SPBF: Ehlers Super Passband Filter
# SPBF: Ehlers Super Passband Filter
| Property | Value |
| ---------------- | -------------------------------- |
| **Category** | Filter |
| **Inputs** | Source (close) |
| **Parameters** | `shortPeriod` (default 40), `longPeriod` (default 60), `rmsPeriod` (default 50) |
| **Outputs** | Single series (SPBF) |
| **Output range** | Tracks input |
| **Warmup** | 1 bar |
### TL;DR
- The **Super Passband Filter** is John Ehlers' wide-band bandpass constructed by differencing two z-transformed EMAs with Ehlers-style smoothing ($\...
- Parameterized by `shortperiod` (default 40), `longperiod` (default 60), `rmsperiod` (default 50).
- 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.
> "Two EMAs walk into a frequency domain. The difference between them is the only thing worth trading."