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# CFITZ: Christiano-Fitzgerald Band-Pass Filter
# CFITZ: Christiano-Fitzgerald Band-Pass Filter
| Property | Value |
| ---------------- | -------------------------------- |
| **Category** | Filter |
| **Inputs** | Source (close) |
| **Parameters** | `pLow` (default 6), `pHigh` (default 32) |
| **Outputs** | Single series (Cfitz) |
| **Output range** | Tracks input |
| **Warmup** | `2` bars |
### TL;DR
- The **Christiano-Fitzgerald Band-Pass Filter** is an asymmetric full-sample filter that approximates the ideal spectral band-pass by using time-var...
- Parameterized by `plow` (default 6), `phigh` (default 32).
- Output range: Tracks input.
- Requires `2` bars of warmup before first valid output (IsHot = true).
- Validated against TA-Lib, Skender, and Tulip reference implementations where available.
## Overview