{
  "slug": "reservation-voicemail",
  "excerptSeconds": 5.0,
  "variants": [
    {
      "file": "plate.flac",
      "kind": "reference-plate",
      "parameters": {
        "sampleRate": 24000,
        "channels": 1,
        "seconds": 5.0
      },
      "expectation": "The clean reference every variant below is scored against.",
      "bytes": 155594
    },
    {
      "file": "noise-snr20.flac",
      "kind": "additive-noise",
      "parameters": {
        "targetSnrDb": 20,
        "achievedSnrDb": 20.0,
        "seed": 7020
      },
      "expectation": "A denoiser is scored against the plate at a measured 20.0 dB SNR.",
      "bytes": 302963
    },
    {
      "file": "noise-snr10.flac",
      "kind": "additive-noise",
      "parameters": {
        "targetSnrDb": 10,
        "achievedSnrDb": 10.0,
        "seed": 7010
      },
      "expectation": "A denoiser is scored against the plate at a measured 10.0 dB SNR.",
      "bytes": 317885
    },
    {
      "file": "noise-snr0.flac",
      "kind": "additive-noise",
      "parameters": {
        "targetSnrDb": 0,
        "achievedSnrDb": -0.0,
        "seed": 7000
      },
      "expectation": "A denoiser is scored against the plate at a measured -0.0 dB SNR.",
      "bytes": 337211
    },
    {
      "file": "clipped.flac",
      "kind": "hard-clipping",
      "parameters": {
        "threshold": 0.25,
        "samplesAffected": 3391
      },
      "expectation": "3391 samples were flattened, so a declipper has an exact target.",
      "bytes": 155383
    },
    {
      "file": "dropouts.flac",
      "kind": "dropouts",
      "parameters": {
        "spans": "[[1.0, 0.12], [3.2, 0.25]]"
      },
      "expectation": "Silence written at exactly these offsets, so gap detection has ground truth.",
      "bytes": 145326
    },
    {
      "file": "rate-44100.flac",
      "kind": "sample-rate",
      "parameters": {
        "sampleRate": 44100
      },
      "expectation": "Resampled from 24000 Hz; anything above 22050 Hz was band-limited away.",
      "bytes": 410419
    },
    {
      "file": "rate-16000.flac",
      "kind": "sample-rate",
      "parameters": {
        "sampleRate": 16000
      },
      "expectation": "Resampled from 24000 Hz; anything above 8000 Hz was band-limited away.",
      "bytes": 191456
    },
    {
      "file": "rate-8000.flac",
      "kind": "sample-rate",
      "parameters": {
        "sampleRate": 8000
      },
      "expectation": "Resampled from 24000 Hz; anything above 4000 Hz was band-limited away.",
      "bytes": 99200
    },
    {
      "file": "codec-mp3-128.mp3",
      "kind": "codec-roundtrip",
      "parameters": {
        "codec": "mp3-128"
      },
      "expectation": "the everyday MP3 bitrate; the plate is the pre-encode original.",
      "bytes": 81452
    },
    {
      "file": "codec-mp3-32.mp3",
      "kind": "codec-roundtrip",
      "parameters": {
        "codec": "mp3-32"
      },
      "expectation": "heavily damaged MP3; the plate is the pre-encode original.",
      "bytes": 20492
    },
    {
      "file": "codec-opus-24.opus",
      "kind": "codec-roundtrip",
      "parameters": {
        "codec": "opus-24"
      },
      "expectation": "aggressive modern speech coding; the plate is the pre-encode original.",
      "bytes": 15129
    },
    {
      "file": "codec-gsm-8k.gsm",
      "kind": "codec-roundtrip",
      "parameters": {
        "codec": "gsm-8k"
      },
      "expectation": "GSM 06.10, the classic mobile codec; the plate is the pre-encode original.",
      "bytes": 8250
    },
    {
      "file": "codec-mulaw-8k.wav",
      "kind": "codec-roundtrip",
      "parameters": {
        "codec": "mulaw-8k"
      },
      "expectation": "G.711 mu-law, North American telephony; the plate is the pre-encode original.",
      "bytes": 40092
    },
    {
      "file": "codec-g722-16k.wav",
      "kind": "codec-roundtrip",
      "parameters": {
        "codec": "g722-16k"
      },
      "expectation": "G.722 wideband, used by VoIP handsets; the plate is the pre-encode original.",
      "bytes": 40092
    },
    {
      "file": "chain-telephone.wav",
      "kind": "processing-chain",
      "parameters": {
        "chain": "highpass 300 Hz, lowpass 3400 Hz, resample 8000 Hz, G.711 mu-law"
      },
      "expectation": "The full narrowband telephone path, which is how real support audio arrives.",
      "bytes": 40092
    }
  ]
}