Percentile Statistical LN Level Calculator
Actualequal-windowLnexceededpercent nearest-rankempiricalquantile,not logarithmicmean/genericpercentilewithoutdirection. Actual matched calibration,units,edition,geometry/measurement and model applicability independently established;not hearing/structural safety,compliance or universal perceptual prediction.
Description
An Ln noise level is exceeded for n percent of the observation time.
An Ln noise level is exceeded for n percent of the observation time.1
This calculator uses a nearest-rank empirical quantile of equal-duration level windows, rather than an energy average or an ordinary percentile with the same directional label.
When to use Percentile Statistical LN Level Calculator
Use this tool to apply the stated percentile statistical ln level calculator operation with an explicit input and unit basis.
How to use Percentile Statistical LN Level Calculator and how it works
- Establish the measurement basis and units described above.
- Enter actualEqualDurationLevelsDb, actualPercentOfTimeExceeded and run the tool.
- Read result.observedNearestRankLnDb using the output meanings below.
- If input is rejected, correct the stated type, range, ordering or alignment issue and rerun; review successful results under the declared convention.
| Input field | Meaning | Value type | Requirement |
|---|---|---|---|
| actualEqualDurationLevelsDb | Equal Duration Levels Db. Units, ordering and applicable branch are specified in the algorithm. | array of number | required; dense; align related rows as specified; further conditions in the algorithm |
| actualPercentOfTimeExceeded | Percent Of Time Exceeded. Units, ordering and applicable branch are specified in the algorithm. | number | required; finite; further conditions in the algorithm |
Require a nonempty finite dB level list and exceedance percent p in [0,100]. Sort ascending and select index min(N−1,max(0,ceil((1−p/100)N)−1)). The endpoints select maximum at p=0 and minimum at p=100; repeated levels follow this declared nearest-rank convention.
index = clamp(ceil((1−p/100)N)−1, 0, N−1) Apply the declared units, ordering and branch conditions.
| Output field | Meaning | Value type |
|---|---|---|
| result | Object containing the declared output fields. | object |
| result.observedNearestRankLnDb | Selected empirical exceedance level in dB under the declared nearest-rank rule. | number |
{
"input": {
"actualEqualDurationLevelsDb": [
30,
40,
50
],
"actualPercentOfTimeExceeded": 50
},
"output": {
"result": {
"observedNearestRankLnDb": 40
}
}
}Limitations and assumptions
The output applies the declared operation to the values you supply. Establish the measurement basis, units, coefficients and any caller-selected rules before interpreting it. The tool does not independently collect or verify observations or decide whether a model or reference applies.
Supply explicit required fields with the documented types and dense aligned arrays. Unknown fields, wrong types and nonfinite numbers are rejected. Branch-specific constraints are explained above. A returned boolean, signed difference or tied result follows the stated convention; an input error instead means the required input contract was not satisfied. Very large inputs or outputs may be rejected by shared resource limits.
Alternative or Complementary methods
For a related operation, use Traffic Noise L10 Estimate Calculator. Traffic-noise L10 describes a level exceeded for a specified portion of a measurement period or predicted under a qualified model.
For a related operation, use CNEL Community Noise Equivalent Calculator. Community Noise Equivalent Level combines day, evening and night energy averages with time-of-day penalties.
References
Similar or alternative tools
- Traffic Noise L10 Estimate Calculator
Traffic-noise L10 describes a level exceeded for a specified portion of a measurement period or predicted under a qualified model.
- CNEL Community Noise Equivalent Calculator
Community Noise Equivalent Level combines day, evening and night energy averages with time-of-day penalties.