FA-50304 / PCM sample encoding / Member archive

Pcm channel lifting chain: source feedback · case 04

Interchannel lifting feeds an encoded residual back as source amplitude.

Member previewVariant 4 · 3 implementations · 8 checks per implementation

Case contract

Losslessly represent each PCM frame as a first-channel anchor followed by differences from immediately preceding original channels; preserve empty and mono frames.

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, 2, 6], [1, 1, 3]]`	`[[3, 2, 3], [1, 1, 2]]`	Failed

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

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