FA-49029 / PCM sample encoding / Member archive

Excess code recenter: negative headroom · case 04

Negative available amplitude is inferred from positive headroom.

Member previewVariant 4 · 3 implementations · 8 checks per implementation

Case contract

Recenter bounded unsigned PCM around an explicitly calibrated zero code and report asymmetric representable headroom; clamp invalid code inputs before recentering.

Why this case matters

Offline PCM interchange uses these exact bounded packet and sample representation decisions.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
oracle 1	`[[-3, -4, 4], [0, -4, 4], [4, -4, 4], [4, -4, 4]]`	`[[-3, -3, 4], [0, -3, 4], [4, -3, 4], [4, -3, 4]]`	Failed

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This record includes three runnable implementations, regression fixtures, execution results, and source hashes.

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