{
  "title": "Call Safety Guide Voicemail Transcription Clarity Lab",
  "published": "2026-09-04",
  "sampleCount": 12,
  "targetCard": {
    "name": "Maya Chen",
    "phone": "415-555-0198",
    "zip": "94107",
    "intent": "water heater estimate",
    "note": "All names, numbers, and circumstances are fictional."
  },
  "method": {
    "voices": [
      "Microsoft Zira Desktop (en-US)",
      "Microsoft David Desktop (en-US)"
    ],
    "audioFormat": "16 kHz, 16-bit, mono WAV",
    "wordingConditions": [
      "compact",
      "grouped",
      "repeated"
    ],
    "paceConditions": [
      "neutral SAPI rate 0",
      "fast SAPI rate +2"
    ],
    "noiseConditions": [
      "clean",
      "deterministic white noise at 20 dB SNR",
      "deterministic white noise at 5 dB SNR"
    ],
    "transcriber": "Systran/faster-whisper-small",
    "fasterWhisperVersion": "1.2.1",
    "device": "CPU",
    "computeType": "int8",
    "beamSize": 5,
    "language": "English fixed",
    "randomSeed": 20260904
  },
  "limitations": [
    "This is a controlled synthetic-voice test, not a study of human callers.",
    "It does not reproduce carrier compression, voicemail platform processing, room echo, accents, stress, or background speech.",
    "Results apply only to these 12 files, this recognizer version, and the disclosed settings.",
    "Field scoring checks exact target recovery; it does not measure listener comprehension or business conversion."
  ],
  "samples": [
    {
      "sample_id": "zira-compact-clean",
      "voice": "Microsoft Zira Desktop",
      "voice_label": "Zira",
      "wording": "compact",
      "pace": "neutral",
      "sapi_rate": 0,
      "noise_snr_db": null,
      "script": "Hi, this is Maya Chen. Call me at four one five five five five zero one nine eight. My ZIP is nine four one zero seven. I need a water heater estimate.",
      "audio": "/lab/transcription-clarity/zira-compact-clean.wav",
      "captions": "/lab/transcription-clarity/zira-compact-clean.vtt",
      "durationSeconds": 12.5,
      "transcript": "Hi, this is Maya Chen. Call me at 4155550198. My zip is 94107. I need a water heater estimate.",
      "wer": 0.0,
      "detectedLanguage": "en",
      "nameExact": true,
      "phoneExact": true,
      "zipExact": true,
      "intentExact": true,
      "exactFieldCount": 4
    },
    {
      "sample_id": "david-compact-clean",
      "voice": "Microsoft David Desktop",
      "voice_label": "David",
      "wording": "compact",
      "pace": "neutral",
      "sapi_rate": 0,
      "noise_snr_db": null,
      "script": "Hi, this is Maya Chen. Call me at four one five five five five zero one nine eight. My ZIP is nine four one zero seven. I need a water heater estimate.",
      "audio": "/lab/transcription-clarity/david-compact-clean.wav",
      "captions": "/lab/transcription-clarity/david-compact-clean.vtt",
      "durationSeconds": 12.6,
      "transcript": "Hi, this is Maya Chan. Call me at 4155550198. My zip is 9407. I need a water heater estimate.",
      "wer": 0.062,
      "detectedLanguage": "en",
      "nameExact": false,
      "phoneExact": true,
      "zipExact": false,
      "intentExact": true,
      "exactFieldCount": 2
    },
    {
      "sample_id": "zira-grouped-clean",
      "voice": "Microsoft Zira Desktop",
      "voice_label": "Zira",
      "wording": "grouped",
      "pace": "neutral",
      "sapi_rate": 0,
      "noise_snr_db": null,
      "script": "Hi, this is Maya Chen. My callback number is four one five, five five five, zero one nine eight. My ZIP code is nine four one zero seven. I am calling about a water heater estimate.",
      "audio": "/lab/transcription-clarity/zira-grouped-clean.wav",
      "captions": "/lab/transcription-clarity/zira-grouped-clean.vtt",
      "durationSeconds": 15.0,
      "transcript": "Hi, this is Maya Chen. My callback number is 415-555-0198. My zip code is 94107. I am calling about a water heater estimate.",
      "wer": 0.0,
      "detectedLanguage": "en",
      "nameExact": true,
      "phoneExact": true,
      "zipExact": true,
      "intentExact": true,
      "exactFieldCount": 4
    },
    {
      "sample_id": "david-grouped-clean",
      "voice": "Microsoft David Desktop",
      "voice_label": "David",
      "wording": "grouped",
      "pace": "neutral",
      "sapi_rate": 0,
      "noise_snr_db": null,
      "script": "Hi, this is Maya Chen. My callback number is four one five, five five five, zero one nine eight. My ZIP code is nine four one zero seven. I am calling about a water heater estimate.",
      "audio": "/lab/transcription-clarity/david-grouped-clean.wav",
      "captions": "/lab/transcription-clarity/david-grouped-clean.vtt",
      "durationSeconds": 15.1,
      "transcript": "Hi, this is Maya Chan. My callback number is 415-555-0198. My zip code is 94107. I am calling about a water heater estimate.",
      "wer": 0.028,
      "detectedLanguage": "en",
      "nameExact": false,
      "phoneExact": true,
      "zipExact": true,
      "intentExact": true,
      "exactFieldCount": 3
    },
    {
      "sample_id": "zira-repeated-clean",
      "voice": "Microsoft Zira Desktop",
      "voice_label": "Zira",
      "wording": "repeated",
      "pace": "neutral",
      "sapi_rate": 0,
      "noise_snr_db": null,
      "script": "Hi, this is Maya Chen. My callback number is four one five, five five five, zero one nine eight. I will repeat that: four one five, five five five, zero one nine eight. My ZIP code is nine four one zero seven. I am calling about a water heater estimate.",
      "audio": "/lab/transcription-clarity/zira-repeated-clean.wav",
      "captions": "/lab/transcription-clarity/zira-repeated-clean.vtt",
      "durationSeconds": 21.2,
      "transcript": "Hi, this is Maya Chen. My callback number is 415-555-0198. I will repeat that, 415-555-0198. My zip code is 94107. I am calling about a water heater estimate.",
      "wer": 0.0,
      "detectedLanguage": "en",
      "nameExact": true,
      "phoneExact": true,
      "zipExact": true,
      "intentExact": true,
      "exactFieldCount": 4
    },
    {
      "sample_id": "david-repeated-clean",
      "voice": "Microsoft David Desktop",
      "voice_label": "David",
      "wording": "repeated",
      "pace": "neutral",
      "sapi_rate": 0,
      "noise_snr_db": null,
      "script": "Hi, this is Maya Chen. My callback number is four one five, five five five, zero one nine eight. I will repeat that: four one five, five five five, zero one nine eight. My ZIP code is nine four one zero seven. I am calling about a water heater estimate.",
      "audio": "/lab/transcription-clarity/david-repeated-clean.wav",
      "captions": "/lab/transcription-clarity/david-repeated-clean.vtt",
      "durationSeconds": 21.2,
      "transcript": "Hi, this is Maya Chan. My callback number is 415-555-0198. I will repeat that, 415-555-0198. My zip code is 94107. I am calling about a water heater estimate.",
      "wer": 0.02,
      "detectedLanguage": "en",
      "nameExact": false,
      "phoneExact": true,
      "zipExact": true,
      "intentExact": true,
      "exactFieldCount": 3
    },
    {
      "sample_id": "zira-grouped-fast",
      "voice": "Microsoft Zira Desktop",
      "voice_label": "Zira",
      "wording": "grouped",
      "pace": "fast",
      "sapi_rate": 2,
      "noise_snr_db": null,
      "script": "Hi, this is Maya Chen. My callback number is four one five, five five five, zero one nine eight. My ZIP code is nine four one zero seven. I am calling about a water heater estimate.",
      "audio": "/lab/transcription-clarity/zira-grouped-fast.wav",
      "captions": "/lab/transcription-clarity/zira-grouped-fast.vtt",
      "durationSeconds": 11.8,
      "transcript": "Hi, this is Maya Chen. My callback number is 415-555-0198. My zip code is 94107. I am calling about a water heater estimate.",
      "wer": 0.0,
      "detectedLanguage": "en",
      "nameExact": true,
      "phoneExact": true,
      "zipExact": true,
      "intentExact": true,
      "exactFieldCount": 4
    },
    {
      "sample_id": "david-grouped-fast",
      "voice": "Microsoft David Desktop",
      "voice_label": "David",
      "wording": "grouped",
      "pace": "fast",
      "sapi_rate": 2,
      "noise_snr_db": null,
      "script": "Hi, this is Maya Chen. My callback number is four one five, five five five, zero one nine eight. My ZIP code is nine four one zero seven. I am calling about a water heater estimate.",
      "audio": "/lab/transcription-clarity/david-grouped-fast.wav",
      "captions": "/lab/transcription-clarity/david-grouped-fast.vtt",
      "durationSeconds": 11.8,
      "transcript": "Hi, this is Maya Chen. My callback number is 415-555-0198. My zip code is 94107. I am calling about a water heater estimate.",
      "wer": 0.0,
      "detectedLanguage": "en",
      "nameExact": true,
      "phoneExact": true,
      "zipExact": true,
      "intentExact": true,
      "exactFieldCount": 4
    },
    {
      "sample_id": "zira-grouped-20db",
      "voice": "Microsoft Zira Desktop",
      "voice_label": "Zira",
      "wording": "grouped",
      "pace": "neutral",
      "sapi_rate": 0,
      "noise_snr_db": 20,
      "script": "Hi, this is Maya Chen. My callback number is four one five, five five five, zero one nine eight. My ZIP code is nine four one zero seven. I am calling about a water heater estimate.",
      "audio": "/lab/transcription-clarity/zira-grouped-20db.wav",
      "captions": "/lab/transcription-clarity/zira-grouped-20db.vtt",
      "durationSeconds": 15.0,
      "transcript": "Hi, this is Maya Chen. My callback number is 415-555-0198. My zip code is 94107. I am calling about a water heater estimate.",
      "wer": 0.0,
      "detectedLanguage": "en",
      "nameExact": true,
      "phoneExact": true,
      "zipExact": true,
      "intentExact": true,
      "exactFieldCount": 4
    },
    {
      "sample_id": "zira-grouped-5db",
      "voice": "Microsoft Zira Desktop",
      "voice_label": "Zira",
      "wording": "grouped",
      "pace": "neutral",
      "sapi_rate": 0,
      "noise_snr_db": 5,
      "script": "Hi, this is Maya Chen. My callback number is four one five, five five five, zero one nine eight. My ZIP code is nine four one zero seven. I am calling about a water heater estimate.",
      "audio": "/lab/transcription-clarity/zira-grouped-5db.wav",
      "captions": "/lab/transcription-clarity/zira-grouped-5db.vtt",
      "durationSeconds": 15.0,
      "transcript": "Hi, this is Maya Chen. My callback number is 415-555-0198. My zip code is 94107. I am calling about a water heater estimate.",
      "wer": 0.0,
      "detectedLanguage": "en",
      "nameExact": true,
      "phoneExact": true,
      "zipExact": true,
      "intentExact": true,
      "exactFieldCount": 4
    },
    {
      "sample_id": "david-grouped-20db",
      "voice": "Microsoft David Desktop",
      "voice_label": "David",
      "wording": "grouped",
      "pace": "neutral",
      "sapi_rate": 0,
      "noise_snr_db": 20,
      "script": "Hi, this is Maya Chen. My callback number is four one five, five five five, zero one nine eight. My ZIP code is nine four one zero seven. I am calling about a water heater estimate.",
      "audio": "/lab/transcription-clarity/david-grouped-20db.wav",
      "captions": "/lab/transcription-clarity/david-grouped-20db.vtt",
      "durationSeconds": 15.1,
      "transcript": "Hi, this is my Achan. My callback number is 415-555-0198. My zip code is 9407. I am calling about a water heater estimate.",
      "wer": 0.083,
      "detectedLanguage": "en",
      "nameExact": false,
      "phoneExact": true,
      "zipExact": false,
      "intentExact": true,
      "exactFieldCount": 2
    },
    {
      "sample_id": "david-grouped-5db",
      "voice": "Microsoft David Desktop",
      "voice_label": "David",
      "wording": "grouped",
      "pace": "neutral",
      "sapi_rate": 0,
      "noise_snr_db": 5,
      "script": "Hi, this is Maya Chen. My callback number is four one five, five five five, zero one nine eight. My ZIP code is nine four one zero seven. I am calling about a water heater estimate.",
      "audio": "/lab/transcription-clarity/david-grouped-5db.wav",
      "captions": "/lab/transcription-clarity/david-grouped-5db.vtt",
      "durationSeconds": 15.1,
      "transcript": "Hi, this is Maya Chan. My callback number is 415-555-0198. My zip code is 94107. I am calling about a water heater estimate.",
      "wer": 0.028,
      "detectedLanguage": "en",
      "nameExact": false,
      "phoneExact": true,
      "zipExact": true,
      "intentExact": true,
      "exactFieldCount": 3
    }
  ]
}