{
  "schema": 1,
  "purpose": "Timing-only listening reconstruction; not recovered original audio.",
  "transcript": {
    "path": "solution/audio/666ab731-duration-transcript.txt",
    "sha256": "864670c42f02852a511fa697b2791f21088fda0321c35649c801d12223f67987",
    "line_count": 60,
    "digits": 2994,
    "encoded_duration_ms": 113120,
    "source": "Read from the checked-in derived duration transcript."
  },
  "historical_context": {
    "original_name": "666ab731.wav",
    "historical_page_duration_ms": 113152,
    "difference_from_encoded_duration_ms": 32,
    "original_bytes": "unrecovered"
  },
  "synthesis": {
    "sample_rate_hz": 8000,
    "channels": 1,
    "sample_format": "16-bit PCM WAV",
    "packet_duration_rule": "digit d becomes (d + 1) × 16 ms",
    "audible_tone": "1000 Hz sine; analyst-selected, not source-derived",
    "packet_boundary": "1 ms silence per packet; analyst-selected listening cue",
    "fade": "up to 1 ms cosine ramp; analyst-selected click reduction"
  },
  "output": {
    "path": "solution/audio/666ab731-duration-reconstruction.wav",
    "sha256": "95e20bd26c812fb640e1bab61f118e57b6db9bf1ca65a10d68f40a8c3bd9df4d",
    "sample_count": 904960,
    "duration_ms": 113120
  }
}