{
  "date": "2026-11-04",
  "origin": "Constructed from our original synthetic English speech control, generated locally with Microsoft Zira Desktop on November 3. No user/private/third-party media.",
  "reference": "Please review these words before you share the transcript.",
  "fixtures": [
    {
      "file": "aligned-stereo.wav",
      "frames": 89826,
      "sample_rate": 22050,
      "channels": 2,
      "bytes": 359348,
      "sha256": "479ba2e17e24782c385716de525e1127fb0383ec013467163967496dfbaed848",
      "duration_seconds": 4.07374149659864,
      "relationship": "right = left",
      "integer_mix_rms": 0.10120951545662597
    },
    {
      "file": "inverted-stereo.wav",
      "frames": 89826,
      "sample_rate": 22050,
      "channels": 2,
      "bytes": 359348,
      "sha256": "b17f99f2725c3db0d84a503e148e864dd836d20dc1b167fe151642775d859af5",
      "duration_seconds": 4.07374149659864,
      "relationship": "right = -left",
      "integer_mix_rms": 0.0
    },
    {
      "file": "single-channel.wav",
      "frames": 89826,
      "sample_rate": 22050,
      "channels": 1,
      "bytes": 179698,
      "sha256": "e17aeeb9a534450e0bad95ceb032268b7118ea2be1a8f87ca1439bd2993e42ac",
      "duration_seconds": 4.07374149659864,
      "relationship": "Original left channel only"
    }
  ],
  "downmix_formula": "For two channels, mono[i] = left[i]/2 + right[i]/2, matching app.js decode().",
  "nonzero_sample_example": {
    "frame": 2725,
    "left_pcm16": 1075,
    "aligned_right_pcm16": 1075,
    "inverted_right_pcm16": -1075,
    "aligned_mean_pcm16": 1075,
    "inverted_mean_pcm16": 0
  },
  "scope": "Integer PCM inspection and arithmetic, not a browser decoding/transcription result."
}