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 # sound:filter - filter a signal

 Last update: 31.07.2026 

**Version: 0.0.0**

## Description

Filters a 1D signal, using a linear, time-invariant digital filter. The filter is an Infinite Impulse Response (IIR) filter, defined by its vectors of coefficients B (numerator) and A (denominator) in the z-domain. If A contains only one coefficient, equal to 1, it is a Finite Impulse Response (FIR) filter. If A is not specified, it will be set to value 1. If the first value of the A coefficients (A\[0\]) is not set to 1.0, all coefficient values will be divided by A\[0\] to normalize the filter.

## Inputs

InputNameExpected type(s)Description**Pin 0**   
Requiredsignal\_to\_filter[`field`](../../core-concepts/dpf-types.md#field)Signal to filter.**Pin 1**   
Requiredfilter\_b\_coefficients[`vector<double>`](../../core-concepts/dpf-types.md#standard-types)Coefficients B of the filter.**Pin 2**filter\_a\_coefficients[`vector<double>`](../../core-concepts/dpf-types.md#standard-types)(Optional) Coefficients A of the filter.## Outputs

OutputNameExpected type(s)Description**Pin 0**filtered\_signal[`field`](../../core-concepts/dpf-types.md#field)Filtered signal, as a field.## 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**: filter\_signal

**License**: avrxp\_snd\_level1

## Changelog

- Version 0.0.0: Initial release.