FA-49459 / PCM sample encoding / Member archive

Pcm progressive refinement: residual mask · case 04

A one-bit boundary mask replaces the low-bit refinement mask.

Member previewVariant 4 · 3 implementations · 8 checks per implementation

Case contract

Restore PCM from arithmetic-shift coarse samples and optional unsigned low-bit refinements; missing refinement bits are zero and out-of-field residual bits are masked.

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	`[4, -8, 12]`	`[7, -7, 14]`	Failed

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