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Miha Kralj
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lib/filters/bessel/Bessel.md
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# BESSEL: Bessel Filter
# BESSEL: Bessel Filter
| Property | Value |
| ---------------- | -------------------------------- |
| **Category** | Filter |
| **Inputs** | Source (close) |
| **Parameters** | `length` |
| **Outputs** | Single series (Bessel) |
| **Output range** | Tracks input |
| **Warmup** | 1 bar |
### TL;DR
- The Bessel Filter is a 2nd-order low-pass IIR filter designed to preserve the **shape** and **timing** of price moves.
- Parameterized by `length`.
- 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.
> When you care more about *when* the market turns than how aggressively you can torture the noise, you reach for a Bessel.