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lib/cycles/ssfdsp/Ssfdsp.md
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# SSFDSP: Ehlers SSF Detrended Synthetic Price
| Property | Value |
| ---------------- | -------------------------------- |
| **Category** | Cycle |
| **Inputs** | Source (close) |
| **Parameters** | `period` (default 40) |
| **Outputs** | Single series (SsfDsp) |
| **Output range** | Varies (see docs) |
| **Warmup** | `slowPeriod * 2` bars |
### TL;DR
- SSFDSP isolates the dominant cycle by subtracting a half-cycle Super-Smoother from a quarter-cycle Super-Smoother, producing a zero-centered oscill...
- Parameterized by `period` (default 40).
- Output range: Varies (see docs).
- Requires `slowPeriod * 2` bars of warmup before first valid output (IsHot = true).
- Validated against TA-Lib, Skender, and Tulip reference implementations where available.
SSFDSP isolates the dominant cycle by subtracting a half-cycle Super-Smoother from a quarter-cycle Super-Smoother, producing a zero-centered oscillator with superior noise rejection compared to the EMA-based DSP. The 2-pole Butterworth characteristic of the Super-Smoother filter provides zero phase lag at the cutoff frequency and sharper rolloff than exponential smoothing, making SSFDSP the preferred variant for cycle-aware trading when the approximate dominant period is known.
## Historical Context