FA-49337 / PCM sample encoding / Member archive

Pcm block exponent: restore scale · case 02

Exponent metadata is ignored during block reconstruction.

Member previewVariant 2 · 3 implementations · 8 checks per implementation

Case contract

Bounded block-floating PCM: choose the smallest shared right shift fitting signed mantissas, cap exponent, saturate residual overflow and report reconstructed 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, [0, 4, -5], [0, 4, -5]]`	`[1, [0, 4, -5], [0, 8, -10]]`	Failed

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

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