FA-49868 / PCM sample encoding / Member archive

Pcm alaw code selection: negative magnitude rule · case 03

A-law negative input omits its complement offset at quantization boundaries.

Member previewVariant 3 · 3 implementations · 8 checks per implementation

Case contract

Stipulated bounded A-law-style PCM encoder with negative complement offset, thirteen-bit working magnitude, segment-specific shifts and alternating wire mask.

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	`[213, 213, 85, 212, 84]`	`[213, 213, 85, 212, 85]`	Failed

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