FA-48956 / PCM sample encoding / Open access
Sign magnitude pcm: zero sideband · case 01
The negative-zero marker tests the complete signed code for zero.
ROOT CAUSE
The negative-zero marker tests the complete signed code for zero.
VERIFIED REPAIR
Use the stated conversion contract at zero sideband.
Unsuccessful approach: Marking every numerical zero loses the distinction between signs.
Case contract
Decode sign-magnitude PCM with configurable physical sign-bit polarity and preserve numerical negative zero as a Boolean sideband.
Why this case matters
Offline PCM interchange uses these exact bounded packet and sample representation decisions.
1 / The failure
Exit 1"""Failure Map reference implementation. Python standard library only."""
import json
N = 1
observations = []
def solve(codes, width, invert_sign):
mask=(1<<(width-1))-1
sign=1<<(width-1)
values=[]
zeros=[]
for code in codes:
magnitude=code&mask
negative=bool(code&sign)^invert_sign
values.append(-magnitude if negative else magnitude)
zeros.append(bool(negative and code==0))
return [values,zeros]
def check(label, actual, expected):
observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
check('oracle 1', solve(*([0, 1, 7, 8, 9, 15], 4, False)), [[0, 1, 7, 0, -1, -7], [False, False, False, True, False, False]])
check('oracle 2', solve(*([0, 8, 1, 9], 4, True)), [[0, 0, -1, 1], [True, False, False, False]])
check('oracle 3', solve(*([], 4, False)), [[], []])
check('oracle 4', solve(*([0, 3, 4, 7], 3, False)), [[0, 3, 0, -3], [False, False, True, False]])
check('oracle 5', solve(*([0, 128, 255, 127], 8, False)), [[0, 0, -127, 127], [False, True, False, False]])
check('oracle 6', solve(*([1, 2, 3], 4, True)), [[-1, -2, -3], [False, False, False]])
check('oracle 7', solve(*([0, 4], 3, True)), [[0, 0], [True, False]])
if N == 1: check('variant packet 1', solve(*[[0, 1, 7, 8, 9, 15, 0, 1, 7, 8, 9, 15], 4, False]), [[0, 1, 7, 0, -1, -7, 0, 1, 7, 0, -1, -7], [False, False, False, True, False, False, False, False, False, True, False, False]])
if N == 2: check('variant packet 2', solve(*[[0, 1, 7, 8, 9, 15, 0, 1, 7, 8, 9, 15, 0, 1, 7, 8, 9, 15], 4, False]), [[0, 1, 7, 0, -1, -7, 0, 1, 7, 0, -1, -7, 0, 1, 7, 0, -1, -7], [False, False, False, True, False, False, False, False, False, True, False, False, False, False, False, True, False, False]])
if N == 3: check('variant packet 3', solve(*[[0, 1, 7, 8, 9, 15, 0, 1, 7, 8, 9, 15, 0, 1, 7, 8, 9, 15, 0, 1, 7, 8, 9, 15], 4, False]), [[0, 1, 7, 0, -1, -7, 0, 1, 7, 0, -1, -7, 0, 1, 7, 0, -1, -7, 0, 1, 7, 0, -1, -7], [False, False, False, True, False, False, False, False, False, True, False, False, False, False, False, True, False, False, False, False, False, True, False, False]])
if N == 4: check('variant packet 4', solve(*[[0, 1, 7, 8, 9, 15, 0, 1, 7, 8, 9, 15, 0, 1, 7, 8, 9, 15, 0, 1, 7, 8, 9, 15, 0, 1, 7, 8, 9, 15], 4, False]), [[0, 1, 7, 0, -1, -7, 0, 1, 7, 0, -1, -7, 0, 1, 7, 0, -1, -7, 0, 1, 7, 0, -1, -7, 0, 1, 7, 0, -1, -7], [False, False, False, True, False, False, False, False, False, True, False, False, False, False, False, True, False, False, False, False, False, True, False, False, False, False, False, True, False, False]])
if N == 5: check('variant packet 5', solve(*[[0, 1, 7, 8, 9, 15, 0, 1, 7, 8, 9, 15, 0, 1, 7, 8, 9, 15, 0, 1, 7, 8, 9, 15, 0, 1, 7, 8, 9, 15, 0, 1, 7, 8, 9, 15], 4, False]), [[0, 1, 7, 0, -1, -7, 0, 1, 7, 0, -1, -7, 0, 1, 7, 0, -1, -7, 0, 1, 7, 0, -1, -7, 0, 1, 7, 0, -1, -7, 0, 1, 7, 0, -1, -7], [False, False, False, True, False, False, False, False, False, True, False, False, False, False, False, True, False, False, False, False, False, True, False, False, False, False, False, True, False, False, False, False, False, True, False, False]])
print(json.dumps({"observations": observations, "passed": all(x["passed"] for x in observations)}, ensure_ascii=False))
raise SystemExit(0 if all(x["passed"] for x in observations) else 1)
| Boundary fixture | Actual | Expected | Outcome |
|---|---|---|---|
| oracle 1 | [[0, 1, 7, 0, -1, -7], [False, False, False, False, False, False]] | [[0, 1, 7, 0, -1, -7], [False, False, False, True, False, False]] | Failed |
| oracle 2 | [[0, 0, -1, 1], [True, False, False, False]] | [[0, 0, -1, 1], [True, False, False, False]] | Passed |
| oracle 3 | [[], []] | [[], []] | Passed |
| oracle 4 | [[0, 3, 0, -3], [False, False, False, False]] | [[0, 3, 0, -3], [False, False, True, False]] | Failed |
| oracle 5 | [[0, 0, -127, 127], [False, False, False, False]] | [[0, 0, -127, 127], [False, True, False, False]] | Failed |
| oracle 6 | [[-1, -2, -3], [False, False, False]] | [[-1, -2, -3], [False, False, False]] | Passed |
| oracle 7 | [[0, 0], [True, False]] | [[0, 0], [True, False]] | Passed |
| variant packet 1 | [[0, 1, 7, 0, -1, -7, 0, 1, 7, 0, -1, -7], [False, False, False, False, False, False, False, False, False, False, False, False]] | [[0, 1, 7, 0, -1, -7, 0, 1, 7, 0, -1, -7], [False, False, False, True, False, False, False, False, False, True, False, False]] | Failed |
SHA-256 / 45ad7f1b04410a9503c3f85072f5472aae7b72b39fdff46339980599ca24a906
2 / The unsuccessful fix
Exit 1"""Failure Map reference implementation. Python standard library only."""
import json
N = 1
observations = []
def solve(codes, width, invert_sign):
mask=(1<<(width-1))-1
sign=1<<(width-1)
values=[]
zeros=[]
for code in codes:
magnitude=code&mask
negative=bool(code&sign)^invert_sign
values.append(-magnitude if negative else magnitude)
zeros.append(bool(magnitude==0))
return [values,zeros]
def check(label, actual, expected):
observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
check('oracle 1', solve(*([0, 1, 7, 8, 9, 15], 4, False)), [[0, 1, 7, 0, -1, -7], [False, False, False, True, False, False]])
check('oracle 2', solve(*([0, 8, 1, 9], 4, True)), [[0, 0, -1, 1], [True, False, False, False]])
check('oracle 3', solve(*([], 4, False)), [[], []])
check('oracle 4', solve(*([0, 3, 4, 7], 3, False)), [[0, 3, 0, -3], [False, False, True, False]])
check('oracle 5', solve(*([0, 128, 255, 127], 8, False)), [[0, 0, -127, 127], [False, True, False, False]])
check('oracle 6', solve(*([1, 2, 3], 4, True)), [[-1, -2, -3], [False, False, False]])
check('oracle 7', solve(*([0, 4], 3, True)), [[0, 0], [True, False]])
if N == 1: check('variant packet 1', solve(*[[0, 1, 7, 8, 9, 15, 0, 1, 7, 8, 9, 15], 4, False]), [[0, 1, 7, 0, -1, -7, 0, 1, 7, 0, -1, -7], [False, False, False, True, False, False, False, False, False, True, False, False]])
if N == 2: check('variant packet 2', solve(*[[0, 1, 7, 8, 9, 15, 0, 1, 7, 8, 9, 15, 0, 1, 7, 8, 9, 15], 4, False]), [[0, 1, 7, 0, -1, -7, 0, 1, 7, 0, -1, -7, 0, 1, 7, 0, -1, -7], [False, False, False, True, False, False, False, False, False, True, False, False, False, False, False, True, False, False]])
if N == 3: check('variant packet 3', solve(*[[0, 1, 7, 8, 9, 15, 0, 1, 7, 8, 9, 15, 0, 1, 7, 8, 9, 15, 0, 1, 7, 8, 9, 15], 4, False]), [[0, 1, 7, 0, -1, -7, 0, 1, 7, 0, -1, -7, 0, 1, 7, 0, -1, -7, 0, 1, 7, 0, -1, -7], [False, False, False, True, False, False, False, False, False, True, False, False, False, False, False, True, False, False, False, False, False, True, False, False]])
if N == 4: check('variant packet 4', solve(*[[0, 1, 7, 8, 9, 15, 0, 1, 7, 8, 9, 15, 0, 1, 7, 8, 9, 15, 0, 1, 7, 8, 9, 15, 0, 1, 7, 8, 9, 15], 4, False]), [[0, 1, 7, 0, -1, -7, 0, 1, 7, 0, -1, -7, 0, 1, 7, 0, -1, -7, 0, 1, 7, 0, -1, -7, 0, 1, 7, 0, -1, -7], [False, False, False, True, False, False, False, False, False, True, False, False, False, False, False, True, False, False, False, False, False, True, False, False, False, False, False, True, False, False]])
if N == 5: check('variant packet 5', solve(*[[0, 1, 7, 8, 9, 15, 0, 1, 7, 8, 9, 15, 0, 1, 7, 8, 9, 15, 0, 1, 7, 8, 9, 15, 0, 1, 7, 8, 9, 15, 0, 1, 7, 8, 9, 15], 4, False]), [[0, 1, 7, 0, -1, -7, 0, 1, 7, 0, -1, -7, 0, 1, 7, 0, -1, -7, 0, 1, 7, 0, -1, -7, 0, 1, 7, 0, -1, -7, 0, 1, 7, 0, -1, -7], [False, False, False, True, False, False, False, False, False, True, False, False, False, False, False, True, False, False, False, False, False, True, False, False, False, False, False, True, False, False, False, False, False, True, False, False]])
print(json.dumps({"observations": observations, "passed": all(x["passed"] for x in observations)}, ensure_ascii=False))
raise SystemExit(0 if all(x["passed"] for x in observations) else 1)
| Boundary fixture | Actual | Expected | Outcome |
|---|---|---|---|
| oracle 1 | [[0, 1, 7, 0, -1, -7], [True, False, False, True, False, False]] | [[0, 1, 7, 0, -1, -7], [False, False, False, True, False, False]] | Failed |
| oracle 2 | [[0, 0, -1, 1], [True, True, False, False]] | [[0, 0, -1, 1], [True, False, False, False]] | Failed |
| oracle 3 | [[], []] | [[], []] | Passed |
| oracle 4 | [[0, 3, 0, -3], [True, False, True, False]] | [[0, 3, 0, -3], [False, False, True, False]] | Failed |
| oracle 5 | [[0, 0, -127, 127], [True, True, False, False]] | [[0, 0, -127, 127], [False, True, False, False]] | Failed |
| oracle 6 | [[-1, -2, -3], [False, False, False]] | [[-1, -2, -3], [False, False, False]] | Passed |
| oracle 7 | [[0, 0], [True, True]] | [[0, 0], [True, False]] | Failed |
| variant packet 1 | [[0, 1, 7, 0, -1, -7, 0, 1, 7, 0, -1, -7], [True, False, False, True, False, False, True, False, False, True, False, False]] | [[0, 1, 7, 0, -1, -7, 0, 1, 7, 0, -1, -7], [False, False, False, True, False, False, False, False, False, True, False, False]] | Failed |
SHA-256 / bad44ad8a74c484877f995b063cfff1d154b36f76330e7904d5d307f8168ec9b
3 / The verified repair
Exit 0"""Failure Map reference implementation. Python standard library only."""
import json
N = 1
observations = []
def solve(codes, width, invert_sign):
mask=(1<<(width-1))-1
sign=1<<(width-1)
values=[]
zeros=[]
for code in codes:
magnitude=code&mask
negative=bool(code&sign)^invert_sign
values.append(-magnitude if negative else magnitude)
zeros.append(bool(negative and magnitude==0))
return [values,zeros]
def check(label, actual, expected):
observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
check('oracle 1', solve(*([0, 1, 7, 8, 9, 15], 4, False)), [[0, 1, 7, 0, -1, -7], [False, False, False, True, False, False]])
check('oracle 2', solve(*([0, 8, 1, 9], 4, True)), [[0, 0, -1, 1], [True, False, False, False]])
check('oracle 3', solve(*([], 4, False)), [[], []])
check('oracle 4', solve(*([0, 3, 4, 7], 3, False)), [[0, 3, 0, -3], [False, False, True, False]])
check('oracle 5', solve(*([0, 128, 255, 127], 8, False)), [[0, 0, -127, 127], [False, True, False, False]])
check('oracle 6', solve(*([1, 2, 3], 4, True)), [[-1, -2, -3], [False, False, False]])
check('oracle 7', solve(*([0, 4], 3, True)), [[0, 0], [True, False]])
if N == 1: check('variant packet 1', solve(*[[0, 1, 7, 8, 9, 15, 0, 1, 7, 8, 9, 15], 4, False]), [[0, 1, 7, 0, -1, -7, 0, 1, 7, 0, -1, -7], [False, False, False, True, False, False, False, False, False, True, False, False]])
if N == 2: check('variant packet 2', solve(*[[0, 1, 7, 8, 9, 15, 0, 1, 7, 8, 9, 15, 0, 1, 7, 8, 9, 15], 4, False]), [[0, 1, 7, 0, -1, -7, 0, 1, 7, 0, -1, -7, 0, 1, 7, 0, -1, -7], [False, False, False, True, False, False, False, False, False, True, False, False, False, False, False, True, False, False]])
if N == 3: check('variant packet 3', solve(*[[0, 1, 7, 8, 9, 15, 0, 1, 7, 8, 9, 15, 0, 1, 7, 8, 9, 15, 0, 1, 7, 8, 9, 15], 4, False]), [[0, 1, 7, 0, -1, -7, 0, 1, 7, 0, -1, -7, 0, 1, 7, 0, -1, -7, 0, 1, 7, 0, -1, -7], [False, False, False, True, False, False, False, False, False, True, False, False, False, False, False, True, False, False, False, False, False, True, False, False]])
if N == 4: check('variant packet 4', solve(*[[0, 1, 7, 8, 9, 15, 0, 1, 7, 8, 9, 15, 0, 1, 7, 8, 9, 15, 0, 1, 7, 8, 9, 15, 0, 1, 7, 8, 9, 15], 4, False]), [[0, 1, 7, 0, -1, -7, 0, 1, 7, 0, -1, -7, 0, 1, 7, 0, -1, -7, 0, 1, 7, 0, -1, -7, 0, 1, 7, 0, -1, -7], [False, False, False, True, False, False, False, False, False, True, False, False, False, False, False, True, False, False, False, False, False, True, False, False, False, False, False, True, False, False]])
if N == 5: check('variant packet 5', solve(*[[0, 1, 7, 8, 9, 15, 0, 1, 7, 8, 9, 15, 0, 1, 7, 8, 9, 15, 0, 1, 7, 8, 9, 15, 0, 1, 7, 8, 9, 15, 0, 1, 7, 8, 9, 15], 4, False]), [[0, 1, 7, 0, -1, -7, 0, 1, 7, 0, -1, -7, 0, 1, 7, 0, -1, -7, 0, 1, 7, 0, -1, -7, 0, 1, 7, 0, -1, -7, 0, 1, 7, 0, -1, -7], [False, False, False, True, False, False, False, False, False, True, False, False, False, False, False, True, False, False, False, False, False, True, False, False, False, False, False, True, False, False, False, False, False, True, False, False]])
print(json.dumps({"observations": observations, "passed": all(x["passed"] for x in observations)}, ensure_ascii=False))
raise SystemExit(0 if all(x["passed"] for x in observations) else 1)
| Boundary fixture | Actual | Expected | Outcome |
|---|---|---|---|
| oracle 1 | [[0, 1, 7, 0, -1, -7], [False, False, False, True, False, False]] | [[0, 1, 7, 0, -1, -7], [False, False, False, True, False, False]] | Passed |
| oracle 2 | [[0, 0, -1, 1], [True, False, False, False]] | [[0, 0, -1, 1], [True, False, False, False]] | Passed |
| oracle 3 | [[], []] | [[], []] | Passed |
| oracle 4 | [[0, 3, 0, -3], [False, False, True, False]] | [[0, 3, 0, -3], [False, False, True, False]] | Passed |
| oracle 5 | [[0, 0, -127, 127], [False, True, False, False]] | [[0, 0, -127, 127], [False, True, False, False]] | Passed |
| oracle 6 | [[-1, -2, -3], [False, False, False]] | [[-1, -2, -3], [False, False, False]] | Passed |
| oracle 7 | [[0, 0], [True, False]] | [[0, 0], [True, False]] | Passed |
| variant packet 1 | [[0, 1, 7, 0, -1, -7, 0, 1, 7, 0, -1, -7], [False, False, False, True, False, False, False, False, False, True, False, False]] | [[0, 1, 7, 0, -1, -7, 0, 1, 7, 0, -1, -7], [False, False, False, True, False, False, False, False, False, True, False, False]] | Passed |
SHA-256 / a33c066e7eed7956b343ff7323fac4d926c00b17f09c5e607cc2355dfb5d0dd7
Verification & scope
Stipulated finite model; no claim of hardware timing or full file-format conformance. This reproducer isolates one failure mechanism. Results cover the supplied fixtures. Variants within a family share a test contract and should remain grouped when constructing evaluation splits. Related mechanisms with a shared evaluation_group must also remain together; these controlled models are not independent production incidents.
Observations recorded using Python 3.12.14 at 2026-09-29T14:44:55.404734+00:00.
Case digest / 28ac32046b87756223f4a0a745825f2c5235efebbe47956b41791c30596a04bd