Noise Attenuation Distance Calculator
Point-source geometric distance attenuation plus independent atmospheric/path screen loss, no diffuse/line-source substitution or human exposure standard. Caller independently establishes units, regime, calibration and applicability; this does not establish design-code compliance, authenticity, operational safety, treatment efficacy or a validated forecast.
Description
A point-source attenuation model combines geometric spreading with supplied additional losses.
A point-source attenuation model combines geometric spreading with supplied additional losses.1
Its assumptions differ from distributed sources, reflections and a full site-specific acoustic analysis. Use this tool to calculate noise Attenuation Distance from the supplied measurements and assumptions.
When to use Noise Attenuation Distance Calculator
Use this tool to calculate noise Attenuation Distance from the supplied measurements and assumptions. Establish the SI units or caller unit basis, load signs, measurement interval, model conditions and independently chosen coefficients or references.
How to use Noise Attenuation Distance Calculator and understand its results
- Establish the SI units or caller unit basis, load signs, measurement interval, model conditions and independently chosen coefficients or references.
- Enter observedReferenceLevelDb, referenceDistanceM, queryDistanceM, callerAtmosphericLossDbPerM, callerAdditionalScreeningLossDb, using the field meanings and rules below, then run the tool.
- Read modeledPointSourceLevelDb. Interpret the fields using their units, signs and evidence conventions below.
- If input validation fails, correct the reported field and run again. Before applying the result, check reference scope, model assumptions and any missing evidence or placeholder values.
| Input field | Meaning | Value type | Requirement |
|---|---|---|---|
| observedReferenceLevelDb | Observed reference level db | number | Required |
| referenceDistanceM | Reference distance m | number | Required |
| queryDistanceM | Query distance m | number | Required |
| callerAtmosphericLossDbPerM | Caller atmospheric loss db per m | number | Required |
| callerAdditionalScreeningLossDb | Caller additional screening loss db | number | Required |
Enter a finite reference sound level in dB, positive reference/query distances in m, nonnegative atmospheric loss per meter and nonnegative additional loss in dB. Apply inverse-distance spreading and the signed difference in atmospheric path length. Query distance may be shorter than reference, giving a modeled increase; no reflections or source directivity are included.
queryDb=referenceDb−20log10(queryDistance/referenceDistance)−lossDbPerM×(queryDistance−referenceDistance)−additionalLossDb Use the exact units, boundary rules, ordering and missing-evidence conventions above.
| Output field | Meaning | Value type |
|---|---|---|
| modeledPointSourceLevelDb | Modeled Point Source Level Db; follow the units, sign, ordering and evidence convention stated above | number |
{
"input": {
"observedReferenceLevelDb": 80,
"referenceDistanceM": 10,
"queryDistanceM": 20,
"callerAtmosphericLossDbPerM": 0.1,
"callerAdditionalScreeningLossDb": 2
},
"output": {
"modeledPointSourceLevelDb": 70.97940008672037
}
}Limitations and assumptions
Its assumptions differ from distributed sources, reflections and a full site-specific acoustic analysis. Interpretation depends on the units, sampling scope and exact model described above.
All listed fields require explicit values. Unexpected fields, incorrect types, nonfinite numbers and sparse evidence arrays fail validation; the specific bounds and alignment requirements are stated above. Extremely large inputs or outputs can also be rejected. An input error is distinct from a successful result reporting false, no matches or missing evidence.
Alternative or Complementary methods
Use Noise Dose Calculator for this related task: Noise dose accumulates exposure durations using a declared criterion level, criterion duration and exchange rate.
Use Gaussian Plume Concentration Calculator when its separate inputs and assumptions fit the question: A reflected Gaussian plume model represents crosswind and vertical spreading under declared conditions.
References
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Noise Attenuation Distance Calculator — tool.io
Similar or alternative tools
- Noise Dose Calculator
Noise dose accumulates exposure durations using a declared criterion level, criterion duration and exchange rate.
- Gaussian Plume Concentration Calculator
A reflected Gaussian plume model represents crosswind and vertical spreading under declared conditions.