Source: https://jmrplens.github.io/phonometry/reference/api/aeroacoustics/measurement-system/ Aircraft-noise measurement-system tolerances (IEC 61265:1995). The certification levels of [`phonometry.aircraft.certification`](/phonometry/reference/api/aeroacoustics/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`](/phonometry/reference/api/filters/compliance/#verify_filter_class) (subclause 4.6) and is not repeated here. > Auto-generated from the source docstrings by `scripts/generate_api_docs.py` (`make api-docs`). Do not edit by hand. ## verify_aircraft_noise_system ```python 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. |