PPG 2x-16x Examples¶
compressionKIT currently ships a set of four reference PPG RVQ operating points that make the compression-versus-fidelity tradeoff easy to evaluate. They share the same overall training flow and differ mainly in how aggressively the signal is compressed.
At A Glance¶
| Variant | Archived v1 PRD | Retest PRD | Archived v1 MSE | Retest MSE | Best Use |
|---|---|---|---|---|---|
| 2× | 4.76% | 4.18% | 0.001688 | 0.001303 | Highest reconstruction fidelity |
| 4× | 6.18% | 5.38% | 0.002850 | 0.002151 | Balanced deployment point |
| 8× | 8.67% | 7.83% | 0.005595 | 0.004556 | Strong savings with preserved morphology |
| 16× | 11.42% | 10.43% | 0.009705 | 0.008099 | Maximum reduction for constrained systems |
The retest values above were regenerated from the current modular flow and improved on the archived v1 golden baselines across all four operating points.
2× Example¶
The 2× model is the most conservative option. It is the right starting point when signal fidelity is the first priority and compression is a secondary constraint.
- Compression ratio: 2×
- Archived v1 PRD: 4.76%
- Current retest PRD: 4.18%
- Archived v1 MSE: 0.001688
- Current retest MSE: 0.001303
This variant is useful when teams want the reconstructed waveform to remain as close as possible to the source signal while still reducing storage and transfer cost.
4× Example¶
The 4× model is a strong middle ground and often the best first deployment candidate when the product needs both quality and efficiency.
- Compression ratio: 4×
- Archived v1 PRD: 6.18%
- Current retest PRD: 5.38%
- Archived v1 MSE: 0.002850
- Current retest MSE: 0.002151
This is the operating point to evaluate when a program needs visible savings without pushing reconstruction quality to the edge.
8× Example¶
The 8× model is a more aggressive compression point that still retains the dominant PPG structure well enough for interactive comparison and product evaluation.
- Compression ratio: 8×
- Archived v1 PRD: 8.67%
- Current retest PRD: 7.83%
- Archived v1 MSE: 0.005595
- Current retest MSE: 0.004556
For many teams, 8× is where the system-level benefit starts to become immediately tangible without losing the core waveform story.
16× Example¶
The 16× model is the most aggressive reference point in the documented v1 set. It is aimed at scenarios where bandwidth, storage, or radio energy dominate the design conversation.
- Compression ratio: 16×
- Archived v1 PRD: 11.42%
- Current retest PRD: 10.43%
- Archived v1 MSE: 0.009705
- Current retest MSE: 0.008099
This operating point is useful when the question is not whether compression helps, but how far it can be pushed while still preserving the signal information that matters.
Configs Used For The Reference Family¶
The corresponding golden-style configs live at the repository root:
How To Evaluate Them¶
The easiest way to explore the family is:
- Start at 2× to anchor the quality ceiling.
- Move to 4× to establish a balanced operating point.
- Jump to 16× to understand the efficiency ceiling.
- Use 8× to decide whether the middle-to-aggressive tradeoff fits the target product.
If you want to see these tradeoffs in a more visual and interactive setting, the browser demo is covered in PPG Codec Demo.