FA-49727 / PCM sample encoding / Member archive

Pcm adaptive nibble reconstruction: adaptation class · case 02

Adaptation loses the highest magnitude bit.

Member previewVariant 2 · 3 implementations · 8 checks per implementation

Case contract

Stipulated bounded adaptive differential PCM nibble model with a 16-entry step table, magnitude adaptation, signed predictor saturation and exported predictor/index state.

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	`[[1, 4, 9, 16, 23, 34, 34, 23], 23, 0]`	`[[1, 4, 9, 16, 23, 39, 37, 6], 6, 15]`	Failed

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