aircraft.measurement_system

Aircraft-noise measurement-system tolerances (IEC 61265:1995).

The certification levels of phonometry.aircraft.certification are only worth what the chain that measured them is, and IEC 61265 is the standard that says how good that chain has to be: microphone directional response, overall frequency response, level linearity and the resolution of the reported level. The one-third-octave filtering itself is covered by the IEC 61260 class 2 verification of phonometry.filters.verify_filter_class (subclause 4.6) and is not repeated here.

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verify_aircraft_noise_system

verify_aircraft_noise_system(
    *,
    directional: dict[float, dict[float, float]] | None = None,
    frequency_response: dict[float, float] | None = None,
    linearity: dict[str, float] | None = None,
    resolution: float | None = None,
) -> dict[str, Any]

Verify measured performance against IEC 61265:1995 tolerances.

Each supplied measurement is checked against the standard’s limit; the one-third-octave filtering itself is covered by the IEC 61260 class-2 verification (subclause 4.6) and is not repeated here.

Parameters

Name	Description
directional	Microphone directional response as {frequency_hz: {angle_deg: |Δsensitivity| dB}} (Table 1, §4.4.2).
frequency_response	System response deviations {frequency_hz: deviation_db} against the ±1.5 dB limit (§4.5.1).
linearity	Level non-linearity {"reference": dB, "other": dB} against the ±0.4/±0.5 dB limits (§4.5.2).
resolution	Readout resolution, in dB, against the 0.1 dB limit (§4.7).

Returns: {"passed": bool, "checks": [{"quantity", "limit", "value", "ok", ...}]}; passed is the conjunction of every check.

Raises

Exception	When
ValueError	If a frequency or angle is out of the tabulated range.