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Included review availability: This review used your included allowance. Your plan provides up to 2 included reviews per hour; 0 remain after this review. 📝 WalkthroughWalkthroughChangesThe pull request adds phase-aware comparison calibration, microphone impedance pressure-ratio calculations, and time-selective signal processing. It also adds plotting and conformance checks, updates monitor readings to use Comparison calibration
Priority: ➖ Normal Estimated code review effort: 4 (Complex) | ~55 minutes Merge Risk: 🔵 Low · up to The change adds phase-aware comparison calibration, impedance corrections and time-selective processing. Two minor open concerns remain: an incomplete changelog sentence, and a default plot that may fail for direct-impulse responses. Neither should block merge, but both are worth fixing. Security Architecture ReviewSecurity architecture risk: 🔵 Low · up to The inspected additions operate on numeric data within the caller’s process and preserve defensive copying of result arrays. No material security risk was identified in those paths. The assessment remains bounded because downstream application exposure and complete security coverage are not established. Retained concerns Security review detailsSecurity Blast Radius
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Codecov Report✅ All modified and coverable lines are covered by tests. Additional details and impacted files@@ Coverage Diff @@
## standards/iec-61094-2-3-reciprocity #920 +/- ##
======================================================================
Coverage ? 96.87%
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Files ? 440
Lines ? 85846
Branches ? 0
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Hits ? 83162
Misses ? 2684
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Numerical conformance
1851/1851 checks pass across 110 domains and 520 standards (226 normative designations, 123 further published sources). Used in the tables below is how much of that clause's published tolerance the deviation consumes: 100 % sits exactly on the limit, 5 % uses a twentieth of the allowance, and a dash means the clause states no two-sided tolerance for the quantity, so there is no budget to spend. It is reported and never used to decide a verdict, which is settled at full precision before any rounding. New checks (58)
Closest to their published limit (top 5) The rows with the least room left, so the ones a change is most likely to push over.
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| Python Version | Tests | Failures | Coverage | Status |
|---|---|---|---|---|
| macos-latest-3.13 | 26095 | 0 | 96.9% |  Passed |
| macos-latest-3.14 | 26095 | 0 | 96.9% | Passed |
| ubuntu-latest-3.13 | 26095 | 0 | 96.9% | Passed |
| ubuntu-latest-3.14 | 26095 | 0 | 96.9% | Passed |
| windows-latest-3.13 | 26095 | 0 | 96.9% | Passed |
| windows-latest-3.14 | 26095 | 0 | 96.9% | Passed |
Full report at this commit: docs/CONFORMANCE.md · docs/conformance.json · full CI artifacts
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CHANGELOG.mddocs/reference/api/index.mddocs/signals/metrology/comparison-calibration.mdllms-full.txtscripts/conformance/domains/comparison_calibration.pyscripts/figures/metrology.pysite/public/llms/llms-signals-metrology.txtsite/src/content/docs/es/signals/metrology/comparison-calibration.mdxsite/src/content/docs/reference/api/metrology/comparison-calibration.mdsite/src/content/docs/signals/metrology/comparison-calibration.mdxsrc/phonometry/_plot/metrology.pysrc/phonometry/metrology/__init__.pysrc/phonometry/metrology/comparison_calibration.pytests/metrology/test_comparison_calibration.pytests/metrology/test_comparison_phase_impedance_time.pytests/result_factories.py
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…orrect for microphones of different acoustic impedance, and keep only the direct sound of a free-field calibration with a time window The comparison calibration of IEC 61094-5 and IEC 61094-8 carried the level of a working standard microphone over from a reference. This completes it with what it left out: the phase of the sensitivity, the effect of microphones of different acoustic impedance (IEC 61094-5 7.4 and 7.5), with each microphone's equivalent volume taken from the lumped model of IEC 61094-2 E.4 that ReciprocityMicrophone holds, and the time-selective processing of IEC 61094-8 Annex B, the direct impulse method of B.6 included. Two printed defects of IEC 61094-8 B.2.1 go to the errata register.
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The comparison calibration of IEC 61094-5 and IEC 61094-8 (#910) carried the level of a working standard microphone over from a reference. This completes it with what it left out: the phase of the sensitivity, the effect of microphones of different acoustic impedance (IEC 61094-5 7.4 and 7.5), and the time-selective processing of IEC 61094-8 Annex B, the direct impulse method of B.6 included.
The phase.
metrology.simultaneous_comparisonandmetrology.sequential_comparisontake the phase of the reference's sensitivity and the phase readings beside the level ones, and theComparisonCalibrationthey return givessensitivity_phase_deg. The interchange of Annex C cancels the phase shifts of the two channels and of the coupler as it cancels their gains, with the difference of the two readings taken into one turn before it is halved, so a channel that inverts the phase gives the right answer; the monitor ratios of A.2 cancel a source that drifts in phase..plot(quantity="phase")draws it. Neither part prints a phase form of (C.3) or of the monitor quotient; they are the level forms written for the complex ratio that both parts call the sensitivity "modulus and phase", and the guide says so.Different acoustic impedances.
metrology.impedance_pressure_ratiogives R_P = (V_x + V_e,ref)/(V_x + V_e,test) for a closed coupler, by the printed Formula (3) of IEC 61094-2, or for the air between two microphones in series with each of them, a divider that is the library's reading of the one sentence the "Microphone impedance" row of Table D.1 gives it. Each microphone's equivalent volume comes from the lumped parameters of IEC 61094-2 E.4 throughmetrology.ReciprocityMicrophone.complex_equivalent_volume_m3, the model the reciprocity calibration of IEC 61094-2 publishes, so the comparison does not keep a second copy of it. Its ratio to the low-frequency volume holds no κr, so a volume given as IEC 61094-1 6.2.2 defines it, with κr = 1,40, stays in that definition, and the series impedance of the air is turned into a volume with that same 1,40. The level and phase of the ratio go to a comparison as the pressure ratio, andstandard_uncertainty_dbreads the level as a rectangular semi-range, as Table D.1 does; the docstring and the guide carry that row's warning that for a WS2F against an LS2P above 10 kHz the uncertainty "should be established experimentally". The parts give no value for the series impedance of the air and leave it to the literature and to experiment, so the user supplies it.Annex B.
metrology.time_selective_responseweights an impulse response with a Tukey, Hann, Hamming or rectangular window (B.1.3), with the tapered edges B.1.2 says the window normally has, and evaluates Formula (B.2) at any frequency, the response of the whole record beside it for comparison.metrology.stepped_sine_impulse_responsetakes a stepped-sine measurement from 0 Hz to the time domain by Formula (B.3), lasting the 1/Δf of B.2.2.metrology.reflection_free_window_sgives the longest window that keeps a reflection out of the region of Formula (B.1).metrology.rectangular_pulseandmetrology.rectangular_pulse_duration_sare the pulse of the direct impulse method, read as the pulse of duration 2b that Formula (B.10) and its first zero describe;time_selective_response(..., excitation=pulse)divides its spectrum out and refuses frequencies at or above its first zero. The sweeps, maximum length sequences and random noise of B.3 to B.5 and the synchronous averaging of B.6.2 already exist inroom,electroacousticsandsignals, and the guide points to them.Every new result has
.plot(), with its figures in light, dark and Spanish. The comparison-calibration guide gains three sections, in English, in Spanish and in its docs/ mirror: time-selective processing with the stepped sine and the direct impulse, the phase of the sensitivity, and microphones of different acoustic impedance.What breaks. Nothing. Every addition is a new name or a keyword argument with a default, and a calibration given no phase readings behaves as before and reports
Nonefor its phases. No migration is needed.How it was checked. Neither part prints a worked example for these clauses, so the 13 new conformance rows (the domain goes from 12 to 25, 1851/1851 overall) are anchored on the numbers the pages do print and on closed forms: the 0,005 dB semi-range of the impedance row of Table D.1 (IEC 61094-5:2016, folio 20, PDF page 22); the 120 Hz and 8 ms and the 30 Hz of B.2.2 (BS EN 61094-8:2012, folio 25, PDF page 27); Formula (B.10) as printed, its first zero at 1/(2b) and the order of magnitude of B.6.1 (folio 28, PDF page 30); the κr = 1,40 of IEC 61094-1 6.2.2 (BS EN 61094-1:2001, PDF page 11); Formula (3) of IEC 61094-2 (folio 10, PDF page 12) and the relations of E.4 (folio 35, PDF page 37), evaluated independently of the library; the phase forms on readings built from known phases, a channel that inverts the phase included; and the check 8.6 suggests, on data simulated with and without a reflection, with the direct sound placed where a transform of the wrong sign fails. The tests also hold every window shape to its closed form. Every quotation and number was read on the printed pages of the editions named. The full test suite, the documentation snippets of every page, the figure checks and the site build pass.
Errata. Two new entries for IEC 61094-8:2012 B.2.1 (folio 25, PDF page 27), in English and Spanish: it refers to "Equation B.2" for a requirement on the frequency range that only the integral over frequency, (B.3), carries; and it says the frequency increment "will determine the time domain resolution", where B.2.2 on the same page has it set the length of the impulse response. The entry on Formula (B.10) now says how the library implements the pulse.
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