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lib/filters/baxterking/BaxterKing.md
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# BK: Baxter-King Band-Pass Filter
# BK: Baxter-King Band-Pass Filter
| Property | Value |
| ---------------- | -------------------------------- |
| **Category** | Filter |
| **Inputs** | Source (close) |
| **Parameters** | `pLow` (default 6), `pHigh` (default 32), `k` (default 12) |
| **Outputs** | Single series (BaxterKing) |
| **Output range** | Tracks input |
| **Warmup** | 1 bar |
### TL;DR
- The **Baxter-King Band-Pass Filter** is a symmetric finite impulse response (FIR) filter that approximates the ideal spectral band-pass by truncati...
- Parameterized by `plow` (default 6), `phigh` (default 32), `k` (default 12).
- 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 business cycle is whatever remains after you strip away the trend and the noise. Baxter and King figured out the stripping."