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 # sound:compute sound power level ISO 3744

 Last update: 31.07.2026 

**Version: 0.0.0**

## Description

Compute the sound power level (SWL) according to the ISO 3744 standard.

## Inputs

InputNameExpected type(s)Description**Pin 0**   
Requiredsurface\_shape[`string`](../../core-concepts/dpf-types.md#standard-types)Shape of the measurement surface.  
  
Supported values are:  
  
\* Hemisphere  
\* Half-hemisphere**Pin 1**   
Requiredsurface\_radius[`double`](../../core-concepts/dpf-types.md#standard-types)Radius in meters of the hemisphere or half-hemisphere measurement surface.**Pin 2**   
RequiredK1[`double`](../../core-concepts/dpf-types.md#standard-types)Background noise correction in dB (section 8.2.3 of ISO 3744).**Pin 3**   
RequiredK2[`double`](../../core-concepts/dpf-types.md#standard-types)Environmental correction K2 in dB (Annex A of ISO 3744).**Pin 4**   
RequiredC1[`double`](../../core-concepts/dpf-types.md#standard-types)Meteorological reference quantity correction C1 in dB (Annex G of ISO 3744).**Pin 5**   
RequiredC2[`double`](../../core-concepts/dpf-types.md#standard-types)Meteorological radiation impedance correction C2 in dB (Annex G of ISO 3744).**Pin 6**   
Requiredmicrophone\_signals[`fields_container`](../../core-concepts/dpf-types.md#fields-container)Signals recorded at various microphone positions on the measurement surface: each signal is stored as a field of microphone\_signals.## Outputs

OutputNameExpected type(s)Description**Pin 0**Lw[`double`](../../core-concepts/dpf-types.md#standard-types)Unweighted sound power level (Lw) in dB.**Pin 1**LwA[`double`](../../core-concepts/dpf-types.md#standard-types)A-weighted sound power level (Lw(A)) in dBA.**Pin 2**octave\_band[`field`](../../core-concepts/dpf-types.md#field)Octave-band sound power levels, in dB.**Pin 3**third\_octave\_band[`field`](../../core-concepts/dpf-types.md#field)One-third-octave-band sound power levels, in dB.## Configurations

NameExpected type(s)Default valueDescription**mutex**[`bool`](../../core-concepts/dpf-types.md#standard-types)falseIf this option is set to true, the shared memory is prevented from being simultaneously accessed by multiple threads.## Scripting

**Category**: sound

**Plugin**: sound

**Scripting name**: None

**Full name**: None

**Internal name**: compute\_sound\_power\_level\_iso3744

**License**: avrxp\_snd\_level1

## Changelog

- Version 0.0.0: Initial release.