{
  "title": "Public JVS paired bandwidth sensitivity experiment",
  "date": "2026-10-15",
  "corpus": "JVS",
  "corpus_url": "https://sites.google.com/site/shinnosuketakamichi/research-topics/jvs_corpus",
  "data_license": "CC BY-SA 4.0; group tags derived from the JVS corpus; no audio redistributed",
  "speakers": 98,
  "group_counts": {
    "female": 49,
    "male": 49
  },
  "measurement_rows": 294,
  "selection": "One plotted, nonsynthetic, normal-reading clip nearest each eligible speaker median f0 and delta_f, selected by Koenami representatives(). 98 eligible speakers from a 100-speaker corpus. No manual exclusion of the remaining two speakers.",
  "reference_pool_clips": 5000,
  "scorer_reference_speakers": 98,
  "independent_test": false,
  "fixed_reference_across_conditions": true,
  "engine_version": "4.1.0",
  "scorer_version": 2,
  "source_commit": "fad14a1b9a0941cc46a40a7fc49b83a21e0da953",
  "engine_sha256": "1682852f7bd3f95bc7e3fb60fdd00153a70c42daacadca1a53f946d6230b0c28",
  "software": {
    "scipy": "1.18.1",
    "numpy": "2.5.3",
    "soundfile": "0.14.0"
  },
  "baseline": "Decode to mono float64; resample_poly to 16000 Hz; save float32 WAV; remeasure with the fixed engine.",
  "roundtrip_8k": "resample_poly(x,1,2), then resample_poly(y,2,1), trimmed to baseline sample count; default Kaiser beta 5 FIR; no high-pass",
  "bandpass_300_3400": "butter(8,[300,3400],btype='bandpass',fs=16000,output='sos'); sosfiltfilt(sos,x) with defaults; N=8 low-pass prototype gives a 16th-order bandpass, forward-backward magnitude is squared",
  "no_added_processing": [
    "pitch shift",
    "time stretch",
    "level normalization",
    "neural enhancement",
    "codec compression"
  ],
  "quality_gates": {
    "voiced_seconds_min": 1,
    "formant_seconds_min": 0.35,
    "clipping_fraction_max": 0.005,
    "resonance_sensitivity_pct_max": 12
  },
  "score_interpretation": "Raw score is a reference-axis coordinate, not a probability. Display is rounded and clamped to [-100,100]. Verdict uses displayed score: >=30 female, <=-30 male, otherwise androgynous.",
  "aggregation": "Both original and processed quality gates must pass. Median paired changes are distinct from differences of group medians. Pair membership differs by condition.",
  "limitations": [
    "Not a real telephone codec or real-time causal filter simulation",
    "Not an independent accuracy or listening-perception test",
    "Reference labels are corpus metadata",
    "One clip per speaker and only this local reference set"
  ],
  "groups": [
    {
      "group": "female",
      "condition": "roundtrip_8k",
      "candidates": 49,
      "n": 32,
      "original_failed": 14,
      "processed_failed": 3,
      "baseline_median": 51.55527860433699,
      "processed_median": 21.478492097864866,
      "paired_score_change_median": -28.92240051736158,
      "paired_delta_f_change_median_hz": -196.09884414209534,
      "paired_f0_change_median_pct": -0.0018157350573477782,
      "original_female_count": 30,
      "female_to_intermediate": 17,
      "female_to_male": 0,
      "any_verdict_change": 17
    },
    {
      "group": "female",
      "condition": "bandpass_300_3400",
      "candidates": 49,
      "n": 35,
      "original_failed": 14,
      "processed_failed": 0,
      "baseline_median": 51.04205845527732,
      "processed_median": 0.04052088170592739,
      "paired_score_change_median": -48.217802935437554,
      "paired_delta_f_change_median_hz": -267.3908941069112,
      "paired_f0_change_median_pct": 4.054112720908187,
      "original_female_count": 32,
      "female_to_intermediate": 30,
      "female_to_male": 0,
      "any_verdict_change": 30
    },
    {
      "group": "male",
      "condition": "roundtrip_8k",
      "candidates": 49,
      "n": 48,
      "original_failed": 0,
      "processed_failed": 1,
      "baseline_median": -49.9025888274258,
      "processed_median": -64.37881170603289,
      "paired_score_change_median": -12.692530366868787,
      "paired_delta_f_change_median_hz": -86.68998656527447,
      "paired_f0_change_median_pct": 0.003951451522166138,
      "original_female_count": 0,
      "female_to_intermediate": 0,
      "female_to_male": 0,
      "any_verdict_change": 6
    },
    {
      "group": "male",
      "condition": "bandpass_300_3400",
      "candidates": 49,
      "n": 48,
      "original_failed": 0,
      "processed_failed": 1,
      "baseline_median": -49.9025888274258,
      "processed_median": -70.06692601546598,
      "paired_score_change_median": -24.684857451892782,
      "paired_delta_f_change_median_hz": -115.48002717054902,
      "paired_f0_change_median_pct": 7.917596292460072,
      "original_female_count": 0,
      "female_to_intermediate": 0,
      "female_to_male": 0,
      "any_verdict_change": 10
    }
  ]
}