FA-49759 / PCM sample encoding / Member archive

Pcm adaptive nibble selection: magnitude remainder · case 04

A selected magnitude bit does not reduce the remaining residual.

Member previewVariant 4 · 3 implementations · 8 checks per implementation

Case contract

Bounded fixed-step adaptive-nibble PCM encoder: greedy magnitude bits, a half-bin base, and predictor feedback from reconstructed rather than original amplitudes.

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, 1, 15, 7], 6]`	`[[1, 1, 13, 7], 10]`	Failed

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

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