#  Copyright (c) 2026. Jose M. Requena-Plens
"""Shared normative reference data (single source of truth).

Tables transcribed verbatim from the published standards. Both the test
suite (``tests/test_*.py``) and the CI conformance report
(``scripts/conformance_report.py``) import these constants, so the report's
expected values can never drift from what the tests assert. Test modules
either import a constant directly where they assert it, or - where the
oracle lives inside a larger inline table (e.g. the ISO 1999 Annex D or
ANSI S12.2 Table D.1 transcriptions) - pin the inline copy to the shared
constant with an explicit consistency assertion. The PR-B building-acoustics
and PR-F human-vibration oracles are additionally pinned to their published
values by dedicated tests in ``tests/test_conformance_report.py``
(``test_building_reference_data_matches_published_oracles`` and
``test_human_vibration_reference_data_matches_oracles``).

This module is deliberately dependency-free (stdlib only) so it can be
imported in the ``pr-comment`` CI job, which installs the runtime
requirements but not ``pytest``.
"""

from __future__ import annotations

import math

INF = math.inf

# ---------------------------------------------------------------------------
# IEC 61672-1:2013 Table 3 - frequency weightings and class-1 acceptance
# limits (standard page 22). Z weighting is 0.0 dB at every frequency.
# Row = (nominal_freq_Hz, A_dB, C_dB, class1_upper_dB, class1_lower_dB).
# ---------------------------------------------------------------------------
IEC61672_TABLE3: list[tuple[float, float, float, float, float]] = [
    (10, -70.4, -14.3, 3.0, -INF),
    (12.5, -63.4, -11.2, 2.5, -INF),
    (16, -56.7, -8.5, 2.0, -4.0),
    (20, -50.5, -6.2, 2.0, -2.0),
    (25, -44.7, -4.4, 2.0, -1.5),
    (31.5, -39.4, -3.0, 1.5, -1.5),
    (40, -34.6, -2.0, 1.0, -1.0),
    (50, -30.2, -1.3, 1.0, -1.0),
    (63, -26.2, -0.8, 1.0, -1.0),
    (80, -22.5, -0.5, 1.0, -1.0),
    (100, -19.1, -0.3, 1.0, -1.0),
    (125, -16.1, -0.2, 1.0, -1.0),
    (160, -13.4, -0.1, 1.0, -1.0),
    (200, -10.9, 0.0, 1.0, -1.0),
    (250, -8.6, 0.0, 1.0, -1.0),
    (315, -6.6, 0.0, 1.0, -1.0),
    (400, -4.8, 0.0, 1.0, -1.0),
    (500, -3.2, 0.0, 1.0, -1.0),
    (630, -1.9, 0.0, 1.0, -1.0),
    (800, -0.8, 0.0, 1.0, -1.0),
    (1000, 0.0, 0.0, 0.7, -0.7),
    (1250, 0.6, 0.0, 1.0, -1.0),
    (1600, 1.0, -0.1, 1.0, -1.0),
    (2000, 1.2, -0.2, 1.0, -1.0),
    (2500, 1.3, -0.3, 1.0, -1.0),
    (3150, 1.2, -0.5, 1.0, -1.0),
    (4000, 1.0, -0.8, 1.0, -1.0),
    (5000, 0.5, -1.3, 1.5, -1.5),
    (6300, -0.1, -2.0, 1.5, -2.0),
    (8000, -1.1, -3.0, 1.5, -2.5),
    (10000, -2.5, -4.4, 2.0, -3.0),
    (12500, -4.3, -6.2, 2.0, -5.0),
    (16000, -6.6, -8.5, 2.5, -16.0),
    (20000, -9.3, -11.2, 3.0, -INF),
]

# ---------------------------------------------------------------------------
# IEC 61260:1995 / EN 61260:1995 Table 1 == ANSI S1.11-2004 Table 1 (octave-band
# limits on relative attenuation, dB). Independently transcribed and verified
# digit-for-digit between the two standards, which agree exactly. This edition
# adds the stricter class 0 (dropped by IEC 61260-1:2014). Rows give the octave
# breakpoint exponent x of Omega = G**x (G = 10**0.3) and the limits per class.
# The pass-band minimum is a constant per class; the max is interpolated across
# the pass-band breakpoints and the min across the stop-band breakpoints.
# ---------------------------------------------------------------------------
IEC61260_1995_PASSBAND_MIN = {0: -0.15, 1: -0.3, 2: -0.5}
# (exponent, class 0 max, class 1 max, class 2 max)
IEC61260_1995_PASSBAND_MAX: list[tuple[float, float, float, float]] = [
    (0.0, 0.15, 0.3, 0.5),
    (0.125, 0.2, 0.4, 0.6),
    (0.25, 0.4, 0.6, 0.8),
    (0.375, 1.1, 1.3, 1.6),
    (0.5, 4.5, 5.0, 5.5),
]
# (exponent, class 0 min, class 1 min, class 2 min)
IEC61260_1995_STOPBAND_MIN: list[tuple[float, float, float, float]] = [
    (0.5, 2.3, 2.0, 1.6),
    (1.0, 18.0, 17.5, 16.5),
    (2.0, 42.5, 42.0, 41.0),
    (3.0, 62.0, 61.0, 55.0),
    (4.0, 75.0, 70.0, 60.0),
]

# ---------------------------------------------------------------------------
# ISO 7196:1995 Table 2 - nominal G-weighting response at one-third-octave
# frequencies (standard page 2). Row = (freq_Hz, dB). Annex A.3 gives the
# instrumentation tolerance of +/- 1 dB from 1 Hz to 20 Hz.
# ---------------------------------------------------------------------------
ISO7196_TABLE2: list[tuple[float, float]] = [
    (0.25, -88.0), (0.315, -80.0), (0.4, -72.1),
    (0.5, -64.3), (0.63, -56.6), (0.8, -49.5),
    (1.00, -43.0), (1.25, -37.5), (1.6, -32.6),
    (2.0, -28.3), (2.5, -24.1), (3.15, -20.0),
    (4.0, -16.0), (5.0, -12.0), (6.3, -8.0),
    (8.0, -4.0), (10.0, 0.0), (12.5, 4.0),
    (16.0, 7.7), (20.0, 9.0), (25.0, 3.7),
    (31.5, -4.0), (40.0, -12.0), (50.0, -20.0),
    (63.0, -28.0), (80.0, -36.0), (100.0, -44.0),
    (125.0, -52.0), (160.0, -60.0), (200.0, -68.0),
    (250.0, -76.0), (315.0, -84.0),
]
ISO7196_G_TOLERANCE_DB = 1.0

# ---------------------------------------------------------------------------
# ISO 717-1 Annex C, Table C.1 - measured airborne sound reduction index R
# (100-3150 Hz, one-third-octave). The worked example gives
# Rw(C;Ctr) = 30(-2;-3) dB with an unfavourable-deviation sum of 31,8 dB.
# ---------------------------------------------------------------------------
ISO717_1_ANNEX_C_R: list[float] = [
    20.4, 16.3, 17.7, 22.6, 22.4, 22.7, 24.8, 26.6,
    28.0, 30.5, 31.8, 32.5, 33.4, 33.0, 31.0, 25.5,
]
ISO717_1_ANNEX_C_EXPECTED = {
    "rw": 30,
    "c": -2,
    "ctr": -3,
    "unfavourable_sum": 31.8,
}

# ---------------------------------------------------------------------------
# ISO 226:2023 Table B.1 - normal equal-loudness-level contours. Row =
# (loudness_level_phon, frequency_Hz, sound_pressure_level_dB). Annex B is
# rounded to 0.1 dB. The definitional identity is at 1 kHz (SPL == phon); we
# anchor the conformance check at a NON-1 kHz point so it exercises the
# contour formula (Table 1 alpha_f/L_U/T_f) rather than the trivial identity.
# ---------------------------------------------------------------------------
ISO226_2023_TABLE_B1_ANCHOR: tuple[float, float, float] = (60.0, 100.0, 78.5)

# ---------------------------------------------------------------------------
# Psychoacoustics "block-A" calibration anchors. Each is the single reference
# value its standard tabulates for the stated calibration signal.
# ---------------------------------------------------------------------------
# ECMA-418-2:2025 (Sottek Hearing Model). Loudness: Clause 5.1.8 defines the
# calibration constant c_N = 0.0211964 so a 1 kHz / 40 dB SPL tone yields
# 1 sone_HMS via the Clause 8 method (c_N adjustable within 0.25 %).
ECMA418_2_LOUDNESS_1KHZ_40DB_SONE = 1.0
ECMA418_2_LOUDNESS_C_N = 0.0211964
# Tonality: Clause 6.2.8 defines c_T = 2.8758615 so a 1 kHz / 40 dB tone
# yields 1 tu_HMS (c_T adjustable within 0.25 %).
ECMA418_2_TONALITY_1KHZ_40DB_TU = 1.0
ECMA418_2_TONALITY_C_T = 2.8758615
# Roughness: Clause 7 tabulates a 1 kHz carrier, 100 % AM at 70 Hz, 60 dB SPL
# -> 1.0 asper as the standard target. Using the tabulated c_R = 0.0180685
# (not reverse-fit) with the literal Formula-65 front-end, this clean-room
# implementation deterministically computes ~1.0735 asper (+7.35 %); the
# offset is documented methodology variance, NOT a tuning defect, so the
# conformance check pins the clean-room value, not the 1.0 target.
ECMA418_2_ROUGHNESS_STANDARD_TARGET_ASPER = 1.0
ECMA418_2_ROUGHNESS_CLEANROOM_ASPER = 1.0735
ECMA418_2_ROUGHNESS_C_R = 0.0180685
# ISO 532-2:2017 (Moore-Glasberg, stationary). Clause 3.17 / Annex B.1: the
# sone is defined so a 1 kHz / 40 dB SPL tone (binaural, free field) is
# 1.000 sone / 40 phon, following from the tabulated C = 0.0617 sone/Cam.
ISO532_2_ANCHOR_1KHZ_40DB_SONE = 1.0
ISO532_2_C = 0.0617
# ISO 532-3:2023 (Moore-Glasberg-Schlittenlacher, time-varying). Annex C.1:
# a steady 1 kHz / 40 dB SPL tone reaches a peak long-term loudness of
# 1.0 sone / 40 phon (the spectral calibration is fixed to this anchor).
ISO532_3_ANCHOR_1KHZ_40DB_SONE = 1.0

# ---------------------------------------------------------------------------
# ISO 16283-3:2016 field facade sound insulation. Clause 3.12 defines the
# apparent sound reduction index of the element (loudspeaker) method as
# R'45deg = L1,s - L2 + 10 lg(S/A) - 1,5. Choosing the specimen area S equal to
# the equivalent absorption area A (A = 0,16 V/T = 0,16 * 62,5 / 1,0 = 10 m2)
# collapses the 10 lg(S/A) coupling term, isolating the -1,5 dB oblique-
# incidence correction exactly: R' = 60 - 20 - 1,5 = 38,5 dB. (Road-traffic
# method R'tr,s uses -3 dB instead; Clause 3.13.)
# ---------------------------------------------------------------------------
ISO16283_3_R45_LOUDSPEAKER_CORRECTION_DB = 1.5
ISO16283_3_R45_SURFACE_LEVEL_DB = 60.0
ISO16283_3_R45_RECEIVE_LEVEL_DB = 20.0
ISO16283_3_R45_AREA_M2 = 10.0
ISO16283_3_R45_VOLUME_M3 = 62.5
ISO16283_3_R45_REVERB_TIME_S = 1.0
ISO16283_3_R45_EXPECTED_DB = 38.5

# ---------------------------------------------------------------------------
# ISO 10140-2:2010 laboratory airborne sound reduction index R (Formula (2)):
# R = L1 - L2 + 10 lg(S/A), A = 0,16 V/T. The reference-curve construction lays
# R exactly on the ISO 717-1 Table 3 shape (100-3150 Hz) by choosing S = A
# (S = 10 m2, A = 0,16 * 50 / 0,8 = 10 m2), so R = L1 - L2 = the reference. The
# 32 dB unfavourable-deviation allowance then permits a 2 dB upward shift of the
# reference (32 dB / 16 bands), giving Rw = curve@500 Hz (52) + 2 = 54 dB - the
# analytic +2-shift anchor (mirrors tests/test_lab_insulation.py).
# ---------------------------------------------------------------------------
ISO10140_2_REF_AIRBORNE_R: list[float] = [
    33, 36, 39, 42, 45, 48, 51, 52, 53, 54, 55, 56, 56, 56, 56, 56,
]
ISO10140_2_REF_AIRBORNE_RW = 54

# ---------------------------------------------------------------------------
# EN 12354-1:2000 Annex H.3 airborne prediction worked example. A separating
# element of Rw = 57 dB and area S = 11,5 m2 is flanked by four elements; each
# contributes an Ff/Fd/Df triplet (12 flanking paths), which with the direct
# Dd path make 13 transmission paths. Energy summation (Formula (26)) gives
# R'w = 52,2 dB -> 52 dB. Row = (label, Rw_flanking, KFf, KFd=KDf, coupling
# length lf). Mirrors tests/test_building_prediction.py (_annex_h_paths).
# ---------------------------------------------------------------------------
EN12354_1_ANNEX_H3_R_DIRECT = 57.0
EN12354_1_ANNEX_H3_SEPARATING_AREA = 11.5
EN12354_1_ANNEX_H3_ELEMENTS: list[tuple[str, float, float, float, float]] = [
    ("floor", 49.0, 12.4, 8.9, 4.5),
    ("ceiling", 46.0, 14.4, 9.2, 4.5),
    ("facade", 42.0, 12.6, 6.7, 2.55),
    ("intwall", 33.0, 33.5, 15.7, 2.55),
]
EN12354_1_ANNEX_H3_NUM_PATHS = 13
EN12354_1_ANNEX_H3_RPRIME_W = 52  # 52,2 dB rounds to 52

# ---------------------------------------------------------------------------
# EN 12354-2:2000 Annex E.3 impact prediction worked example. A concrete floor
# of mass per area m' = 322 kg/m2 has an equivalent normalized impact level
# Ln,w,eq = 164 - 35 lg(m') ~ 76 dB (Formula for heavy floors). With a floating-
# floor improvement ΔLw = 33 dB and a flanking correction K = 2 dB (Table 1;
# separating 322 -> row 300, flanking mean 145 -> col 150), the predicted
# apparent normalized impact level is L'n,w = 76 - 33 + 2 = 45 dB (Formula 21).
# ---------------------------------------------------------------------------
EN12354_2_ANNEX_E3_MASS = 322.0
EN12354_2_ANNEX_E3_FLANKING_MEAN_MASS = 145.0
EN12354_2_ANNEX_E3_DELTA_LW = 33.0
EN12354_2_ANNEX_E3_K = 2
EN12354_2_ANNEX_E3_LPRIME_N_W = 45

# ---------------------------------------------------------------------------
# EN 12354-3:2000 Annex F worked example - facade airborne insulation. A 11,3 m2
# facade (V = 50 m3, flat reflecting so ΔLfs = 0) of four elements, octave bands
# 125-2000 Hz. Rows: (name, area_m2, R_or_Dne_dB[5]); the air inlet is a small
# element entered as Dn,e (already length-corrected to the installed 3 m). The
# apparent R' = -10 lg Σ τe (Formula 10) and D2m,nT = R' + 10 lg(V/(6 T0 S))
# (Formula 13, T0 = 0,5 s) give the single numbers R'tr,s,w = 31 (Ctr = -3) and
# D2m,nT,w = 33 dB (Table F.1.3). NOTE: the standard's own printed per-element
# partial indices sum to R' = 35,8 / 38,0 dB at 1 k / 2 k, whereas its R' row
# prints 35,4 / 37,5 - an internal rounding inconsistency in the 2000 example;
# the low bands (125-500 Hz) and every single-number rating are exact.
# ---------------------------------------------------------------------------
EN12354_3_ANNEX_F_BANDS = (125.0, 250.0, 500.0, 1000.0, 2000.0)
EN12354_3_ANNEX_F_AREA = 11.3
EN12354_3_ANNEX_F_VOLUME = 50.0
EN12354_3_ANNEX_F_ELEMENTS: list[tuple[str, float, list[float]]] = [
    ("wall", 6.0, [41.0, 46.0, 52.0, 58.0, 64.0]),
    ("window2", 4.5, [23.0, 22.0, 30.0, 36.0, 37.0]),
    ("window3", 0.5, [24.0, 27.0, 30.0, 33.0, 30.0]),
]
EN12354_3_ANNEX_F_INLET_DNE = [28.0, 23.0, 25.0, 38.0, 44.0]  # small element, Dn,e
EN12354_3_ANNEX_F_RPRIME_LOW = [24.4, 21.5, 24.9]  # 125/250/500 Hz, digit-exact
EN12354_3_ANNEX_F_RTRS_W = 31
EN12354_3_ANNEX_F_CTR = -3
EN12354_3_ANNEX_F_D2MNT_W = 33

# ---------------------------------------------------------------------------
# EN 12354-4:2000 Annex G worked example - sound radiated to the outside. An
# industrial building (Lp,in in Table G.1, octave 63-8000 Hz, Cd = -5 dB from
# Annex B, apparent R' limited to 40 dB per the Table G.3 footnote). Side 1 is a
# 10x60 m wall (100 mm light concrete, R in Table G.2) with a 6x4 m industrial
# door, segmented into 10x20 = 200 m2 panels; LW = Lp,in + Cd - R' + 10 lg(S/S0)
# (Formula 2). The exterior level uses the simplified Annex E attenuation of a
# finite radiating side: Table G.9 gives A'tot and Lp at reception points in
# front of side 1 (60x10 m) and side 4 (100x10 m). NOTE: the standard's own R'
# rows above 500 Hz are internally inconsistent with its Table G.2 inputs (e.g.
# the wall-only R' prints 36 dB at 1 k while the concrete input is 39 dB, which
# no 40 dB cap can produce); the low bands, the LW relation and the whole Annex E
# propagation reproduce exactly.
# ---------------------------------------------------------------------------
EN12354_4_ANNEX_G_BANDS = (63.0, 125.0, 250.0, 500.0, 1000.0, 2000.0, 4000.0, 8000.0)
EN12354_4_ANNEX_G_LP_IN = [70.0, 74.0, 76.0, 72.0, 70.0, 67.0, 62.0, 57.0]
EN12354_4_ANNEX_G_CD = -5.0
EN12354_4_ANNEX_G_RPRIME_CAP = 40.0
EN12354_4_ANNEX_G_CONCRETE_R = [32.0, 36.0, 36.0, 33.0, 39.0, 49.0, 57.0, 63.0]
EN12354_4_ANNEX_G_DOOR_R = [21.0, 23.0, 28.0, 30.0, 30.0, 30.0, 30.0, 30.0]
EN12354_4_ANNEX_G_SEGMENT_AREA = 200.0
EN12354_4_ANNEX_G_DOOR_AREA = 24.0  # 6 x 4 m
EN12354_4_ANNEX_G_SIDE1_RPRIME_LOW = [28.2, 30.8, 33.9]  # 63/125/250 Hz
EN12354_4_ANNEX_G_SIDE1_LW_LOW = [59.8, 61.2]  # 63/125 Hz, digit-exact
# Table G.9 attenuation and exterior level (side W x H, distance d) -> A'tot, Lp.
# Lp uses the side's A-weighted power level (Table G.8): side1 62,9 / side4 72,9.
EN12354_4_ANNEX_G_SIDE1_LWA = 62.9
EN12354_4_ANNEX_G_SIDE4_LWA = 72.9
EN12354_4_ANNEX_G_ATTENUATION: list[tuple[float, float, float, float]] = [
    # (width, height, distance, A'tot_dB)
    (60.0, 10.0, 5.0, 26.3),
    (60.0, 10.0, 25.0, 34.4),
    (100.0, 10.0, 5.0, 28.3),
    (100.0, 10.0, 25.0, 35.6),
]
EN12354_4_ANNEX_G_LP_SIDE1_D5 = 36.6
EN12354_4_ANNEX_G_LP_SIDE4_D25 = 37.3

# ---------------------------------------------------------------------------
# ISO 12999-1:2020 measurement uncertainty. Table 2 (Clause 7.2) tabulates the
# airborne one-third-octave standard uncertainty; situation A at 1000 Hz is
# 1,8 dB (digit-exact oracle). Table 8 (Clause 8) gives the two-sided 95 %
# coverage factor k = 1,96, so the expanded uncertainty is U = k u = 1,96 u
# exactly; for Rw in situation A (u = 1,2 dB, Table 3) this is U = 2,352 dB.
# ---------------------------------------------------------------------------
ISO12999_1_TABLE2_AIRBORNE_A_1000HZ = 1.8
ISO12999_1_COVERAGE_K_95 = 1.96
ISO12999_1_RW_A_STANDARD_UNCERTAINTY = 1.2

# ---------------------------------------------------------------------------
# ISO 9613-1:1993 Table 1 - pure-tone atmospheric-absorption attenuation
# coefficient (dB/km) at one standard atmosphere (101,325 kPa). Rows are the
# ISO 266 preferred one-third-octave frequencies but the values are computed at
# the EXACT midband frequencies fm = 1000*10^(k/10) (Note 5). Each entry is
# (temperature_degC, relative_humidity_percent, preferred_freq_Hz, alpha_dB_km).
# Digit-exact transcription against the FULL standard text (37 pp): sub-tables
# 1(a)-1(p) span -20 degC to +50 degC in 5 degC steps. The Eq. (3)-(5)
# implementation reproduces every point to < 0,4 % (limited only by the
# 3-significant-figure printed values), well inside the standard's own +/- 10 %
# claimed accuracy (clause 7.1). The second block (20-50 degC) was added once
# the full Table 1 became available, extending the earlier -20..+15 degC oracle.
# ---------------------------------------------------------------------------
ISO9613_1_TABLE1: list[tuple[float, float, float, float]] = [
    (-20.0, 10.0, 50.0, 0.589),
    (-20.0, 50.0, 1000.0, 9.14),
    (-20.0, 70.0, 8000.0, 27.8),
    (-20.0, 100.0, 10000.0, 47.0),
    (0.0, 10.0, 50.0, 0.302),
    (0.0, 50.0, 1000.0, 6.83),
    (0.0, 20.0, 2000.0, 34.6),
    (0.0, 100.0, 6300.0, 88.0),
    (5.0, 50.0, 1000.0, 5.08),
    (10.0, 70.0, 1000.0, 3.66),
    (10.0, 50.0, 4000.0, 46.7),
    (15.0, 50.0, 1000.0, 4.16),
    (15.0, 100.0, 10000.0, 105.0),
    # Extension from the full-text sub-tables 1(i)-1(p) (20 degC .. 50 degC).
    (20.0, 50.0, 1000.0, 4.66),
    (20.0, 50.0, 2000.0, 9.86),
    (25.0, 50.0, 1000.0, 5.68),
    (25.0, 100.0, 2000.0, 11.4),
    (30.0, 50.0, 1000.0, 7.03),
    (30.0, 50.0, 4000.0, 24.5),
    (35.0, 50.0, 1000.0, 8.43),
    (40.0, 50.0, 1000.0, 9.52),
    (45.0, 50.0, 800.0, 7.16),
    (50.0, 50.0, 2000.0, 24.8),
]
# Two representative grid points for the conformance registry (middle + corner).
ISO9613_1_TABLE1_MID = (10.0, 70.0, 1000.0, 3.66)  # dB/km
ISO9613_1_TABLE1_CORNER = (0.0, 20.0, 2000.0, 34.6)  # dB/km

# ---------------------------------------------------------------------------
# ISO 9613-2:1996 outdoor sound propagation — closed-form oracles. The general
# method (clause 7) sums independent physical terms, each with an exact limit:
#   * Eq. (7) geometrical divergence Adiv = 20 lg(d/d0) + 11 = 51,0 dB at 100 m.
#   * Table 3 ground functions have exact on-ground (h = 0), fully-developed
#     (dp -> inf) limits: b'(0) = 1,5 + 8,6 = 10,1 (250 Hz). With porous ground
#     both sides (Gs = Gr = 1) and hs = hr = 0 the source and receiver regions
#     each add (-1,5 + b'(0)), so Agr(250 Hz) = 2*(-1,5 + 10,1) = 17,2 dB.
#   * Clause 7.4 caps the diffraction term Dz at 20 dB (single edge) and 25 dB
#     (double edge); a deep-shadow geometry saturates to those caps exactly.
# ---------------------------------------------------------------------------
ISO9613_2_ADIV_100M = 51.0  # Eq. (7): 20 lg(100/1) + 11
ISO9613_2_GROUND_BPRIME_ZERO = 10.1  # Table 3 b'(h=0, dp->inf) = 1,5 + 8,6
ISO9613_2_GROUND_AGR_250_POROUS = 17.2  # 2*(-1,5 + 10,1), hs=hr=0, Gs=Gr=1
ISO9613_2_BARRIER_CAP_SINGLE = 20.0  # clause 7.4 single-diffraction limit, dB
ISO9613_2_BARRIER_CAP_DOUBLE = 25.0  # clause 7.4 double-diffraction limit, dB

# ---------------------------------------------------------------------------
# ISO 9612:2009 occupational noise exposure — the three normative worked
# examples (Annexes D/E/F), reproduced digit-for-digit by the test suite. Each
# stores the raw measured levels/durations and the standard's reported LEX,8h
# and expanded uncertainty U (k = 1,65, one-sided 95 %). Annex D is the
# task-based welder day; its case (a) omits the task-duration uncertainty
# (U = 2,7 dB), case (b) includes it (U = 3,2 dB). Annexes E (job-based, 18
# workers) and F (full-day forklift drivers) use the Table C.4 sampling budget.
# Task tuples are (samples, duration_hours, duration_range) so the conformance
# report can rebuild the Task objects (Task is not importable here — this module
# is stdlib-only). Mirrors tests/test_occupational_exposure.py.
# ---------------------------------------------------------------------------
ISO9612_ANNEX_D_TASKS: tuple[tuple, ...] = (
    ((70.0,), 1.5, None),
    ((80.1, 82.2, 79.6), 5.0, (4.0, 6.0)),
    ((86.5, 92.4, 89.3, 93.2, 87.8, 86.2), 1.5, (1.0, 2.0)),
)
ISO9612_ANNEX_D_LEX_8H = 84.3
ISO9612_ANNEX_D_U = 2.7  # case (a): task-duration uncertainty omitted
ISO9612_ANNEX_E_SAMPLES: tuple[float, ...] = (88.1, 86.1, 89.7, 86.5, 91.1, 86.7)
ISO9612_ANNEX_E_TE_HOURS = 7.5
ISO9612_ANNEX_E_LEX_8H = 88.1
ISO9612_ANNEX_E_U = 3.8
ISO9612_ANNEX_F_SAMPLES: tuple[float, ...] = (88.0, 91.9, 87.6, 90.4, 89.0, 88.4)
ISO9612_ANNEX_F_TE_HOURS = 9.25
ISO9612_ANNEX_F_LEX_8H = 90.1
ISO9612_ANNEX_F_U = 3.4

# ---------------------------------------------------------------------------
# ISO 11654:1997 rating of sound absorption — the two normative worked examples
# of Annex A. Both use the same practical-coefficient spectrum except at 500 Hz;
# A.1 gives alpha_w = 0,60 with no shape indicator, A.2 (500 Hz raised to 1,00)
# gives alpha_w = 0,60(M). Bands are 250/500/1000/2000/4000 Hz. Mirrors
# tests/test_absorption_rating.py.
# ---------------------------------------------------------------------------
ISO11654_ANNEX_A1_ALPHA_P: tuple[float, ...] = (0.35, 0.70, 0.65, 0.60, 0.55)
ISO11654_ANNEX_A1_ALPHA_W = 0.60
ISO11654_ANNEX_A1_CLASS = "C"
ISO11654_ANNEX_A1_INDICATOR = ""
ISO11654_ANNEX_A2_ALPHA_P: tuple[float, ...] = (0.35, 1.00, 0.65, 0.60, 0.55)
ISO11654_ANNEX_A2_ALPHA_W = 0.60
ISO11654_ANNEX_A2_INDICATOR = "M"

# ---------------------------------------------------------------------------
# ISO 9053-2:2020 alternating-method airflow resistance — the Annex A.3 worked
# example of the effective ratio of specific heats. A closed cylinder 100 mm x
# 100 mm gives V = 7,854e-4 m3 and S = 0,0471 m2; with the IEC 61094-2:2009 air
# properties at 23 C and f = 2 Hz the standard prints b = 1,83e-3 m and the
# heat-conduction-corrected kappa' = kappa*0,978 = 1,370. Mirrors
# tests/test_airflow_resistance.py.
# ---------------------------------------------------------------------------
ISO9053_2_ANNEX_A_SURFACE = 0.0471  # S (m2)
ISO9053_2_ANNEX_A_VOLUME = 7.854e-4  # V (m3)
ISO9053_2_ANNEX_A_FREQUENCY = 2.0  # f (Hz)
ISO9053_2_ANNEX_A_BOUNDARY_LAYER = 1.83e-3  # b (m)
ISO9053_2_ANNEX_A_KAPPA_PRIME = 1.370  # kappa' = kappa*0,978

# ---------------------------------------------------------------------------
# ISO 10534-1:1996 standing-wave-ratio method — closed-form physics oracle from
# Eqs (13)/(14)/(9): a standing-wave ratio s = 3 gives |r| = (s-1)/(s+1) = 0,5
# and absorption alpha = 1 - |r|^2 = 0,75.
# ---------------------------------------------------------------------------
ISO10534_1_SWR = 3.0
ISO10534_1_REFLECTION_MAGNITUDE = 0.5
ISO10534_1_ABSORPTION = 0.75

# ---------------------------------------------------------------------------
# ISO 17497-1:2004 random-incidence scattering coefficient. Eq (2) fixes the
# reference speed of sound c = 343,2 m/s at 20 C. The synthetic worked chain
# (T1..T4 = 8,0/6,0/7,5/5,0 s, V/S from V = 200 m3, S = 10 m2) exercises the
# Sabine absorptions Eq (1)/(4) and the scattering Eq (5). Mirrors
# tests/test_scattering_diffusion.py.
# ---------------------------------------------------------------------------
ISO17497_1_SPEED_OF_SOUND_20C = 343.2  # Eq (2) reference condition (m/s)
ISO17497_1_CHAIN_V = 200.0  # chamber volume V (m3)
ISO17497_1_CHAIN_S = 10.0  # sample area S (m2)
ISO17497_1_CHAIN_C = 343.2  # speed of sound used throughout (m/s)
ISO17497_1_CHAIN_T: tuple[float, float, float, float] = (8.0, 6.0, 7.5, 5.0)
ISO17497_1_CHAIN_ALPHA_S = 0.1342754467754468  # random-incidence absorption
ISO17497_1_CHAIN_ALPHA_SPEC = 0.21484071484071485  # specular absorption
ISO17497_1_CHAIN_SCATTERING = 0.09306108711505018  # s = (a_spec-a_s)/(1-a_s)
# Annex A.5 combined uncertainty of the scattering coefficient. For
# a_spec = 0,6, a_s = 0,3 with u(a_spec) = 0,02 and u(a_s) = 0,01 the
# error-propagation form gives u(s) = 0,0297.
ISO17497_1_A5_ALPHA_SPEC = 0.6
ISO17497_1_A5_ALPHA_S = 0.3
ISO17497_1_A5_U_ALPHA_SPEC = 0.02
ISO17497_1_A5_U_ALPHA_S = 0.01
ISO17497_1_A5_U_SCATTERING = 0.0297147342419613  # combined u(s)

# ---------------------------------------------------------------------------
# ISO 17497-2:2012 diffusion coefficient. Formula (5)/(6) autocorrelation of a
# polar response; the four-level pattern below is re-derived by hand. Formula
# (8) area factors use RADIANS internally, so the zenith weight is
# N0 = (4*pi/dphi)*sin^2(dtheta/4) / A_min with dtheta = dphi = 5 deg.
# ---------------------------------------------------------------------------
ISO17497_2_DIFFUSION_LEVELS: tuple[float, ...] = (70.0, 74.0, 68.0, 72.0)
ISO17497_2_DIFFUSION_COEFF = 0.7367371379926486  # d from Formula (5)
ISO17497_2_AREA_FACTOR_ZENITH = 1.571045588794762  # N0, radians convention

# ---------------------------------------------------------------------------
# ISO 13472-1:2002 in-situ road-surface absorption. The mandatory geometry
# ds = 1,25 m, dm = 0,25 m gives the geometrical-spreading factor Kr = 2/3
# (Clause 4.2). The Annex A worked example (c = 340 m/s, 5 ms flat window)
# gives a maximum-sampled-area radius r ~ 1,34 m. Mirrors
# tests/test_road_absorption.py.
# ---------------------------------------------------------------------------
ISO13472_1_KR = 2.0 / 3.0  # geometrical-spreading factor
ISO13472_1_MSA_WINDOW = 5.0e-3  # reflected-wave window width Tw (s)
ISO13472_1_MSA_RADIUS = 1.3425466996067585  # Annex A worked example (m)

# ---------------------------------------------------------------------------
# ISO 13472-2:2010 spot method. The upper usable (plane-wave) frequency of a
# circular tube is f_u = 0,58 c0/d (Clause 5.4.1); a 100 mm tube at
# c0 = 343 m/s gives f_u = 1989,4 Hz.
# ---------------------------------------------------------------------------
ISO13472_2_SPOT_DIAMETER = 0.100  # tube diameter d (m)
ISO13472_2_SPOT_SPEED = 343.0  # speed of sound c0 (m/s)
ISO13472_2_SPOT_FU = 1989.4  # upper usable frequency (Hz)

# ---------------------------------------------------------------------------
# ISO 3745:2012 precision sound power (anechoic/hemi-anechoic). The Clause 10.5
# EXAMPLE combines sigma_omc = 2,0 dB and sigma_R0 = 0,5 dB at k = 2 to the
# expanded uncertainty U = 4,1 dB. The K1 background correction floors at
# 1,26 dB (>= 6 dB signal-to-noise edge bands). The meteorological correction
# C1 at the 23 C, ps0 reference is 5*lg(296/314) = -0,128 dB. Mirrors
# tests/test_sound_power_precision.py.
# ---------------------------------------------------------------------------
ISO3745_U_SIGMA_R0 = 0.5  # reproducibility standard deviation (dB)
ISO3745_U_SIGMA_OMC = 2.0  # operating/mounting/... std. deviation (dB)
ISO3745_U_COVERAGE = 2.0  # coverage factor k
ISO3745_U_EXPANDED = 4.123105625617661  # U = k*sqrt(sR0^2+somc^2) (dB)
ISO3745_K1_EDGE_LEVEL = 56.0  # measured Lp in the edge band (dB)
ISO3745_K1_EDGE_BACKGROUND = 50.0  # background Lp -> dLp = 6 dB (dB)
ISO3745_K1_EDGE_FREQUENCY = 200.0  # <= 200 Hz band uses the 6 dB floor (Hz)
ISO3745_K1_EDGE_FLOOR = 1.25628  # K1 floor, 6 dB S/N edge band (dB)
ISO3745_C1_REFERENCE = -0.12819  # C1 at 23 C, ps = ps0 (dB)

# ---------------------------------------------------------------------------
# ISO 9614-3:2002 precision intensity scanning. A fully enclosing surface with
# a uniform normal intensity In = W/S recovers the source power exactly, so
# LW = 10*lg(W/P0). For W = 100 uW this is LW = 80 dB (P0 = 1 pW).
# ---------------------------------------------------------------------------
ISO9614_3_UNIFORM_POWER = 1.0e-4  # radiated power W (W)
ISO9614_3_UNIFORM_AREAS: tuple[float, ...] = (0.5, 1.0, 0.25, 2.0)
ISO9614_3_UNIFORM_LW = 80.0  # 10*lg(W/1e-12) (dB)

# ---------------------------------------------------------------------------
# PR-F human vibration (ISO 8041-1 / ISO 2631 / ISO 5349 / Directive 2002/44/EC).
# The true IEC 61260 one-third-octave centre is 10^(n/10) Hz; the reference
# frequencies of ISO 8041-1 Table 1 are exact (rad/s -> Hz). Design-goal
# factors are from ISO 8041-1:2017 Annex B (Tables B.1-B.9, 4 sig. figs).
# ---------------------------------------------------------------------------
# ISO 8041-1 Annex B design-goal weighting factors at the true band centre.
ISO8041_1_WK_FACTOR_6P31HZ = 1.054  # Table B.8, n = 8 (6,31 Hz) - Wk peak
ISO8041_1_WM_FACTOR_1P585HZ = 0.9342  # Table B.9, n = 2 (1,585 Hz) - Wm
# ISO 8041-1 Table 1 weighting factor at the reference frequency.
ISO8041_1_WH_REF_FREQ_HZ = 500.0 / (2.0 * math.pi)  # 79,577 Hz (500 rad/s)
ISO8041_1_WH_REF_FACTOR = 0.2020  # Table 1, Wh @ 500 rad/s
# ISO 5349-2:2001 Annex E worked-example daily exposures A(8), m/s^2.
ISO5349_2_E21_A8 = 4.1  # E.2.1 single tool: 7,4*sqrt(2,5/8)
ISO5349_2_E3_A8 = 3.6  # E.3 forestry three-task combination
# ISO 5349-1:2001 Annex C: Dy = 31,8*A(8)^-1,06; Table C.1 A(8)=7 -> Dy=4 yr.
ISO5349_1_VWF_A8 = 7.0
ISO5349_1_VWF_DY_YEARS = 4.0
# Directive 2002/44/EC Article 3 daily exposure action/limit values.
DIRECTIVE_2002_44_HAV_EAV = 2.5  # A(8) m/s^2, Art. 3(1)(a)
DIRECTIVE_2002_44_HAV_ELV = 5.0  # A(8) m/s^2, Art. 3(1)(b)
DIRECTIVE_2002_44_WBV_EAV = 0.5  # A(8) m/s^2, Art. 3(2)(a)
DIRECTIVE_2002_44_WBV_ELV = 1.15  # A(8) m/s^2, Art. 3(2)(b)

# ---------------------------------------------------------------------------
# ANSI S3.5-1997 Speech Intelligibility Index (one-third-octave method).
# The band-importance function (Table 3) sums to one; the equivalent masking
# spectrum level Zi is a tabulated intermediate of the standard procedure for
# the standard normal-effort spectrum in quiet; the index for that condition
# with normal hearing is the standard-procedure result.
# ---------------------------------------------------------------------------
ANSIS3_5_BAND_IMPORTANCE_SUM = 1.0  # ANSI S3.5-1997 Table 3, sum of Ii
ANSIS3_5_MASKING_Z_200HZ = -1.665  # Zi at 200 Hz, standard spectrum in quiet
ANSIS3_5_STANDARD_QUIET = 0.9958  # SII, standard normal speech, quiet, normal hearing
ANSIS3_5_LOUD_1KHZ = 42.16  # Table 3, loud-effort standard speech spectrum at 1 kHz

# ---------------------------------------------------------------------------
# Prominence of impulsive sounds - NT ACOU 112:2002.
# P = 3*lg(1000) + 2*lg(30) = 11.9542 (Formula 1); the adjustment at P = 10 is
# KI = 1.8*(10 - 5) = 9.0 dB (Formula 2).
# ---------------------------------------------------------------------------
NTACOU112_PROMINENCE = 11.9542  # P for onset rate 1000 dB/s, level difference 30 dB
NTACOU112_ADJUSTMENT_P10 = 9.0  # KI at P = 10

# ---------------------------------------------------------------------------
# Room-noise criteria - ANSI/ASA S12.2-2019.
# Feeding an NC curve of Table 1 back through the tangency method returns its
# NC value; the RC Mark II curves reproduce Table D.1 (the 63 Hz level of the
# RC-31 curve is 51 dB); the mid-frequency average of the RC-35 curve is 35 dB.
# ---------------------------------------------------------------------------
ANSIS12_2_NC40_SELF = 40.0  # NC-40 curve -> tangency rating (Table 1)
ANSIS12_2_RC31_63HZ = 51.0  # RC-31 curve, 63 Hz octave-band level (Table D.1)
ANSIS12_2_RC35_LMF = 35.0  # RC-35 curve, mid-frequency average LMF (clause D.4)

# ---------------------------------------------------------------------------
# Hearing thresholds - ISO 7029:2017 (age) and ISO 389-7:2006 (reference).
# The median deviation follows a*(age-18)**b (Table 1); at 4 kHz for a 60-year
# male it is 20.21 dB. The upper spread su is a degree-5 polynomial (Table 2);
# at 1 kHz age 60 male it is 10.15 dB. The free-field reference threshold at
# 1 kHz is 2.4 dB (ISO 389-7 Table 1).
# ---------------------------------------------------------------------------
ISO7029_MEDIAN_MALE_60_4KHZ = 20.2085  # dB, ISO 7029 Table 1 median formula
ISO7029_SU_MALE_60_1KHZ = 10.1533  # dB, ISO 7029 Table 2 upper spread
ISO389_7_REF_FREE_1KHZ = 2.4  # dB, ISO 389-7 Table 1 free-field

# ---------------------------------------------------------------------------
# Measurement uncertainty - ISO/IEC Guide 98-3 (GUM) and Supplement 1.
# The additive model y = x1+x2+x3+x4 with u(xi)=1 has uc = 2.0 (Suppl 1, 9.2);
# the coverage factor at p=0.99 with 16 degrees of freedom is 2.92 (GUM Annex
# H.1 / Table G.2); equal contributions each with 10 degrees of freedom give a
# Welch-Satterthwaite effective dof of 40 (Annex G.4).
# ---------------------------------------------------------------------------
GUM_ADDITIVE_UC = 2.0  # combined standard uncertainty, additive model
GUM_COVERAGE_K99_16 = 2.92  # coverage factor t at p=0.99, v=16
GUM_WELCH_VEFF = 40.0  # Welch-Satterthwaite effective degrees of freedom

# ---------------------------------------------------------------------------
# Noise-induced hearing loss - ISO 1999:2013, Annex D worked examples (dB).
# Table D.2 (L_EX,8h = 90 dB, 20 years) at 4 kHz: median NIPTS = 13 dB and the
# most-susceptible tenth (fractile 0.9) = 18 dB. Table D.4 (100 dB, 40 years)
# at 3 kHz, fractile 0.9 = 60 dB.
# ---------------------------------------------------------------------------
ISO1999_N50_4K_90_20 = 13.0  # median NIPTS, 4 kHz, 90 dB, 20 yr
ISO1999_N10_4K_90_20 = 18.0  # worst-10 % NIPTS, 4 kHz, 90 dB, 20 yr
ISO1999_N10_3K_100_40 = 60.0  # worst-10 % NIPTS, 3 kHz, 100 dB, 40 yr

# ---------------------------------------------------------------------------
# Multiple-shock whole-body vibration - ISO 2631-5:2018, Annex C worked
# example: five 40 m/s2 response peaks per day, 82 kg male, exposure from age
# b = 20 for n = 20 years at N = 120 days/year. Daily acceleration dose
# Dzd = 55.97 m/s2, stress variable R = 1.22 and injury probability Pi = 0.37.
# ---------------------------------------------------------------------------
ISO2631_5_DZD_MALE = 55.97  # daily acceleration dose, m/s2 (Formula 3)
ISO2631_5_R_MALE = 1.22  # cumulative stress variable R (Formula C.3)
ISO2631_5_PI_MALE = 0.37  # probability of lumbar injury (Formula C.5)

# ---------------------------------------------------------------------------
# Sound absorption in enclosed spaces - EN 12354-6:2003, Annex E worked
# example (4,54 x 2,73 x 2,40 = 29,75 m3 room, 1000 Hz octave band). Case 1
# (bare) A = 2,26 m2, T = 2,1 s; Case 2 (with hard objects) A = 5,03 m2.
# The six bare-room surfaces are (area_m2, alpha at 1000 Hz): floor, ceiling,
# long wall, side wall, side wall, glass facade.
# ---------------------------------------------------------------------------
EN12354_6_ANNEX_E_VOLUME = 29.75  # room volume (m3)
EN12354_6_ANNEX_E_BARE_SURFACES: list[tuple[float, float]] = [
    (12.39, 0.05),  # floor
    (12.39, 0.02),  # ceiling
    (10.90, 0.04),  # long wall
    (10.90, 0.04),  # side wall
    (6.55, 0.04),   # side wall
    (6.55, 0.04),   # glass facade
]
EN12354_6_A_BARE = 2.26  # equivalent absorption area, bare room (m2)
EN12354_6_T_BARE = 2.1  # reverberation time, bare room (s)
EN12354_6_A_OBJECTS = 5.03  # equivalent absorption area, with objects (m2)

# ---------------------------------------------------------------------------
# Prominent discrete tones - ECMA-418-1:2024, clause-EXAMPLE anchors
# (transcribed from the official PDF, printed to one decimal).
# Clause 10 Formula (2): critical band around ft = 1 kHz is
# f1,c = 922,2 Hz .. f2,c = 1084,4 Hz, width dfc = 162,2 Hz (117,3 Hz at
# 500 Hz). Clause 11.6 Formula (14): proximity spacing dfprox = 23 Hz at
# 150 Hz and 63,8 Hz at 850 Hz.
# ---------------------------------------------------------------------------
ECMA418_1_DFC_1KHZ = 162.2  # critical bandwidth at 1 kHz (Hz)
ECMA418_1_DFC_500HZ = 117.3  # critical bandwidth at 500 Hz (Hz)
ECMA418_1_F1_1KHZ = 922.2  # lower critical-band edge at 1 kHz (Hz)
ECMA418_1_F2_1KHZ = 1084.4  # upper critical-band edge at 1 kHz (Hz)
ECMA418_1_PROX_150HZ = 23.0  # proximity spacing at 150 Hz (Hz)
ECMA418_1_PROX_850HZ = 63.8  # proximity spacing at 850 Hz (Hz)

# ---------------------------------------------------------------------------
# ISO 717-2 Annex C, Table C.1 - measured normalized impact sound pressure
# level Ln (100-3150 Hz, one-third-octave, laboratory). The worked example
# gives Ln,w = 79 dB, CI = -11 dB with an unfavourable-deviation sum of
# 28,0 dB.
# ---------------------------------------------------------------------------
ISO717_2_ANNEX_C1_LN: list[float] = [
    62.1, 63.2, 63.5, 66.2, 68.5, 70.0, 71.7, 73.1,
    73.8, 73.5, 73.8, 73.3, 73.1, 73.0, 72.4, 71.2,
]
ISO717_2_ANNEX_C1_EXPECTED = {
    "ln_w": 79,
    "ci": -11,
    "unfavourable_sum": 28.0,
}

# ---------------------------------------------------------------------------
# ISO 15186-1:2000 - sound insulation measured with sound intensity.
# The standard gives no fully worked numeric example, so the intensity sound
# reduction index RI = Lp1 - 6 - [LIn + 10 lg(Sm/S)] (Formula (7)) is anchored
# on the identity that, when the receiving-side intensity levels are chosen so
# that RI reproduces the ISO 717-1 Annex C airborne curve above, the ISO 717-1
# engine returns the same Rw = 30 dB through the intensity path. The
# adaptation term Kc (Annex B) values below are from Formula (B.2)
# Kc = 10 lg(1 + 61,4/f); Formula (B.1) with the reference room
# (Sb2 = 117 m², V2 = 81 m³, c = 340 m/s) reduces to (B.2) within 0,001 dB.
# ---------------------------------------------------------------------------
ISO15186_1_REF_LP1 = 85.0  # flat source-room level (dB)
ISO15186_1_REF_SM = 12.0  # measurement-surface area (m²)
ISO15186_1_REF_S = 10.0  # specimen area (m²)
ISO15186_1_REF_RI = ISO717_1_ANNEX_C_R  # target intensity SRI (16 bands)
ISO15186_1_REF_RIW = 30  # RI,w through the ISO 717-1 engine
ISO15186_1_KC_BANDS = (125.0, 250.0, 500.0, 1000.0, 2000.0)
ISO15186_1_KC_B2 = [1.735, 0.954, 0.503, 0.259, 0.131]  # 10 lg(1+61,4/f), 3 dp

# ---------------------------------------------------------------------------
# ISO 12999-2:2020 - measurement uncertainty for sound absorption.
# The standard's own worked examples are the oracle: Table 4 (sound absorption
# coefficient alpha_s and expanded uncertainty +/-U at k=2, reproducibility,
# one-third-octave 63-5000 Hz) and Table 5 (practical coefficient alpha_p,
# octave 250-4000 Hz). Example 1: alpha_w = 0,70 (MH) +/- 0,07 (k=2);
# Example 2: DLalpha,NRD = (8,1 +/- 1,6) dB (k=2).
# ---------------------------------------------------------------------------
ISO12999_2_TABLE4_FREQ = [
    63, 80, 100, 125, 160, 200, 250, 315, 400, 500,
    630, 800, 1000, 1250, 1600, 2000, 2500, 3150, 4000, 5000,
]
ISO12999_2_TABLE4_ALPHA_S = [
    0.33, 0.35, 0.39, 0.38, 0.37, 0.36, 0.36, 0.36, 0.43, 0.49,
    0.58, 0.63, 0.68, 0.71, 0.73, 0.75, 0.77, 0.79, 0.81, 0.81,
]
ISO12999_2_TABLE4_U_K2 = [
    0.33, 0.26, 0.22, 0.17, 0.13, 0.11, 0.09, 0.08, 0.08, 0.08,
    0.08, 0.08, 0.08, 0.09, 0.09, 0.09, 0.10, 0.11, 0.13, 0.16,
]
ISO12999_2_TABLE5_FREQ = [250, 500, 1000, 2000, 4000]
ISO12999_2_TABLE5_ALPHA_P = [0.50, 0.65, 0.70, 0.85, 0.80]
ISO12999_2_TABLE5_U_K2 = [0.09, 0.08, 0.08, 0.08, 0.10]
ISO12999_2_ALPHA_W_EXAMPLE = 0.70
ISO12999_2_ALPHA_W_U_K2 = 0.07
ISO12999_2_DLALPHA_EXAMPLE = 8.1
ISO12999_2_DLALPHA_U_K2 = 1.6

# ---------------------------------------------------------------------------
# ISO 16251-1:2014 - impact sound improvement of floor coverings (mock-up).
# The standard's Annex B "Table B.1" is a blank report form (no numeric worked
# example), so the conformance anchor is the ISO 717-2:2020 reference floor:
# weighted_impact_rating(Ln,r,0) must return exactly 78 dB (CI = -11), and a
# zero improvement must give Delta-Lw = 0 (Formula 2: Delta-Lw = 78 - Ln,r,w).
# ---------------------------------------------------------------------------
ISO717_2_REFERENCE_FLOOR_FREQ = [
    100, 125, 160, 200, 250, 315, 400, 500,
    630, 800, 1000, 1250, 1600, 2000, 2500, 3150,
]
ISO717_2_REFERENCE_FLOOR_LN_R0 = [
    67.0, 67.5, 68.0, 68.5, 69.0, 69.5, 70.0, 70.5,
    71.0, 71.5, 72.0, 72.0, 72.0, 72.0, 72.0, 72.0,
]
ISO717_2_REFERENCE_FLOOR_LN_R0_W = 78
ISO717_2_REFERENCE_FLOOR_CI = -11

# ---------------------------------------------------------------------------
# ISO 10848-1:2006 — flanking transmission (vibration reduction index Kij).
# The standard contains NO worked numeric example anywhere in Parts 1-4, so
# these are closed-form identities synthesized to hand-checkable results (the
# clean-room oracle strategy). Each expected value is a literal computed by
# hand from the transcribed formula so it is independent of the library code.
# ---------------------------------------------------------------------------
# Simplified Kij, Formula (14): Kij = D̄v,ij + 10 lg(lij / sqrt(Si·Sj)).
# D̄v,ij = 5 dB, lij = 2 m, Si = Sj = 4 m² -> 10 lg(2/4) = -3.0102999566 dB.
ISO10848_KIJ_DBAR = 5.0
ISO10848_KIJ_LIJ = 2.0
ISO10848_KIJ_AREA = 4.0
ISO10848_KIJ_SIMPLIFIED = 1.9897000434  # 5 + 10*log10(0.5)
# Equivalent absorption length, Formula (12), at f = f_ref = 1000 Hz (so the
# sqrt(f_ref/f) factor is 1): aj = 2.2·π²·S/(Ts·c0).
# S = 10 m², Ts = 0.5 s, c0 = 343 m/s -> 2.2·π²·10/(0.5·343).
ISO10848_ABS_AREA = 10.0
ISO10848_ABS_TS = 0.5
ISO10848_ABS_C0 = 343.0
ISO10848_ABS_LENGTH_AT_FREF = 1.2660717015974685  # 2.2*pi**2*10/(0.5*343)
# Total loss factor, η = 2.2/(f·Ts). f = 1000 Hz, Ts = 0.5 s -> 0.0044 exactly.
ISO10848_LOSS_FACTOR = 0.0044

# ---------------------------------------------------------------------------
# ISO 1996-2 tonal audibility -- Annex C.5 worked examples (2007/2009 edition).
# Each row: (tone level Lpt, masking noise Lpn, band centre fc, printed ΔLta,
# printed Kt). Examples 1/2/4 reproduce Formula (C.3) to < 0.05 dB; example 3
# is printed 10.6 but (C.3) gives ~11.2 (rounding in the printed figure), so it
# is used only as a loose check.
ISO1996_2_TONAL_EXAMPLES = [
    (46.7, 37.3, 4000.0, 13.7, 6.0),   # Example 1 (Fig C.3)
    (54.1, 45.2, 430.0, 11.1, 6.0),    # Example 2 (Fig C.4)
    (53.6, 45.5, 755.0, 10.7, 6.0),    # Example 4 (Fig C.6)
]
ISO1996_2_TONAL_EXAMPLE3 = (54.6, 45.5, 308.0, 10.6, 6.0)  # loose (rounding)
# Annex G.2 -- single 1 h measurement uncertainty budget. The tabulated
# per-component products cj*uj (dB) combine to u = 2.18 dB; expanded (k = 2) 4.36.
ISO1996_2_G2_CONTRIBUTIONS = [0.59, 0.3, 2.0, 0.40, 0.38]
ISO1996_2_G2_COMBINED = 2.18
ISO1996_2_G2_EXPANDED = 4.36

# ---------------------------------------------------------------------------
# Reverberation-time prediction -- real worked oracle.
# F. A. Everest & K. C. Pohlmann, *Master Handbook of Acoustics*, 4th ed.,
# Fig. 7-22 "Reverberation Calculation: Example 1": an untreated 23.3 x 16 x 10 ft
# room (concrete floor + 1/2" gypsum-board walls/ceiling) solved with the Sabine
# equation RT60 = 0.049 V / Sa (imperial). Converting the areas and volume to SI
# and evaluating the module's SI Sabine (k = 24 ln10 / 343) reproduces the six
# printed reverberation times to <= 0.012 s (the residual is the book rounding
# the imperial 0.049 constant). This anchors the whole family on measured
# material data, not only on the closed-form identities.
_FT2 = 0.3048 ** 2   # square foot -> m2
_FT3 = 0.3048 ** 3   # cubic foot -> m3
EVEREST_EX1_VOLUME = 3728.0 * _FT3            # 105.565 m3
EVEREST_EX1_FLOOR_AREA = 373.0 * _FT2         # concrete floor, 34.653 m2
EVEREST_EX1_SHELL_AREA = 1159.0 * _FT2        # gypsum walls+ceiling, 107.675 m2
EVEREST_EX1_BANDS = [125.0, 250.0, 500.0, 1000.0, 2000.0, 4000.0]
EVEREST_EX1_FLOOR_ALPHA = [0.01, 0.01, 0.015, 0.02, 0.02, 0.02]   # concrete
EVEREST_EX1_SHELL_ALPHA = [0.29, 0.10, 0.05, 0.04, 0.07, 0.09]    # gypsum board
EVEREST_EX1_RT = [0.54, 1.53, 2.87, 3.39, 2.06, 1.63]             # printed RT60, s
