DDSP Study: Magnitude Compression in Spectral Losses Helps Only If It Matches the Informative Region

kastnerkyle · x · 2026-10-20

• A paper submitted to ICASSP 2027 examines whether magnitude compression (e.g., log-magnitude terms) in DDSP spectral losses actually aids optimization.
• The authors introduce the concept of a system's "informative region" — the part of its dynamic range carrying information toward the target — and propose concordance, a metric that locates this region without training.
• Experiments fitting a modal plate reverb, a subtractive synthesizer, and a low-energy-region system show the loss matching the informative region always wins: uncompressed when the region is at high energies, compressed when low.
• Surprisingly, the common log + linear magnitude combination was best in none of the systems.
• Code and audio examples are open-sourced.

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