environmental.rating

Environmental noise descriptors per ISO 1996-1:2016.

Day-evening-night (Lden, 3.6.4) and day-night (Ldn, 3.6.5) sound levels, and composite whole-day rating levels (6.5, Formulae 5-6).

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composite_rating_level

composite_rating_level(
    periods: Iterable[tuple[float, float, float]],
) -> float

Composite whole-day rating level (ISO 1996-1:2016, 6.5).

Generalizes Formulae (5) and (6): each period contributes its rating level plus adjustment, weighted by its share of the 24 h day:

10*lg[ sum_i (h_i / 24) * 10^(0.1*(L_i + K_i)) ]

Parameters

Name	Description
periods	Iterable of (level_db, hours, adjustment_db) tuples. level_db is the period’s (rating) equivalent continuous level, hours its duration and adjustment_db the time-of-day or source adjustment K (e.g. ISO 1996-1 Table A.1: evening 5 dB, night 10 dB). Hours must be positive and sum to 24.

Returns: Composite rating level in dB.

lden

lden(
    lday: float,
    levening: float,
    lnight: float,
    hours: tuple[float, float, float] = (12.0, 4.0, 8.0),
) -> float

Day-evening-night sound level Lden (ISO 1996-1:2016, 3.6.4).

`Lden = 10lg{(1/24)[t_d10^(0.1Lday) + t_e10^(0.1(Levening+5))

• t_n10^(0.1(Lnight+10))]}`

Parameters

Name	Description
lday	LAeq over the day period, in dB.
levening	LAeq over the evening period, in dB (+5 dB weighting).
lnight	LAeq over the night period, in dB (+10 dB weighting).
hours	(t_day, t_evening, t_night) in hours, summing to 24. Default (12, 4, 8); countries may define the periods differently (3.6.4 Note 1).

Returns: Lden in dB.

ldn

ldn(
    lday: float,
    lnight: float,
    hours: tuple[float, float] = (15.0, 9.0),
) -> float

Day-night sound level Ldn (ISO 1996-1:2016, 3.6.5).

Ldn = 10*lg{(1/24)*[t_d*10^(0.1*Lday) + t_n*10^(0.1*(Lnight+10))]}

Parameters

Name	Description
lday	LAeq over the day period, in dB.
lnight	LAeq over the night period, in dB (+10 dB weighting).
hours	(t_day, t_night) in hours, summing to 24. Default (15, 9).

Returns: Ldn in dB.