FA-48994 / PCM sample encoding / Member archive
Alaw expansion: alternating mask · case 04
Alternating transmission bits are left toggled in A-law decode.
Case contract
Decode eight-bit A-law codes into signed integer PCM using alternating-bit mask85, midpoint reconstruction and explicit segment rules.
Why this case matters
Offline PCM interchange uses these exact bounded packet and sample representation decisions.
One recorded failure
Sample boundary fixtureThis sample comes from the broken implementation of a controlled reproducer.
| Boundary fixture | Actual | Expected | Outcome |
|---|---|---|---|
| oracle 1 | [5504, -5504, 5248, -5248] | [8, -8, 24, -24] | Failed |
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This record includes three runnable implementations, regression fixtures, execution results, and source hashes.
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