FA-49629 / PCM sample encoding / Member archive

Pcm subtractive dither: subtractive restoration · case 04

Decoded PCM retains deterministic dither instead of subtracting it.

Member previewVariant 4 · 3 implementations · 8 checks per implementation

Case contract

Stipulated subtractive-dither PCM converter with a repeating explicit integer noise sequence, even quantizer step, and both wire codes and 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	`[[0, 0], [1, 4], [1, 4], [1, 4]]`	`[[0, 0], [1, 3], [1, 5], [1, 4]]`	Failed

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

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