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.. Generated automatically from Godot engine sources.
.. Generator: https://github.com/godotengine/godot/tree/master/doc/tools/make_rst.py.
.. XML source: https://github.com/godotengine/godot/tree/master/doc/classes/AudioEffectFilter.xml.

.. _class_AudioEffectFilter:

AudioEffectFilter
=================

**Inherits:** :ref:`AudioEffect<class_AudioEffect>` **<** :ref:`Resource<class_Resource>` **<** :ref:`RefCounted<class_RefCounted>` **<** :ref:`Object<class_Object>`

**Inherited By:** :ref:`AudioEffectBandLimitFilter<class_AudioEffectBandLimitFilter>`, :ref:`AudioEffectBandPassFilter<class_AudioEffectBandPassFilter>`, :ref:`AudioEffectHighPassFilter<class_AudioEffectHighPassFilter>`, :ref:`AudioEffectHighShelfFilter<class_AudioEffectHighShelfFilter>`, :ref:`AudioEffectLowPassFilter<class_AudioEffectLowPassFilter>`, :ref:`AudioEffectLowShelfFilter<class_AudioEffectLowShelfFilter>`, :ref:`AudioEffectNotchFilter<class_AudioEffectNotchFilter>`

Adds a filter to the audio bus.

.. rst-class:: classref-introduction-group

Description
-----------

Allows frequencies other than the :ref:`cutoff_hz<class_AudioEffectFilter_property_cutoff_hz>` to pass.

.. rst-class:: classref-introduction-group

Tutorials
---------

- :doc:`Audio buses <../tutorials/audio/audio_buses>`

.. rst-class:: classref-reftable-group

Properties
----------

.. table::
   :widths: auto

   +--------------------------------------------------+--------------------------------------------------------------+------------+
   | :ref:`float<class_float>`                        | :ref:`cutoff_hz<class_AudioEffectFilter_property_cutoff_hz>` | ``2000.0`` |
   +--------------------------------------------------+--------------------------------------------------------------+------------+
   | :ref:`FilterDB<enum_AudioEffectFilter_FilterDB>` | :ref:`db<class_AudioEffectFilter_property_db>`               | ``0``      |
   +--------------------------------------------------+--------------------------------------------------------------+------------+
   | :ref:`float<class_float>`                        | :ref:`gain<class_AudioEffectFilter_property_gain>`           | ``1.0``    |
   +--------------------------------------------------+--------------------------------------------------------------+------------+
   | :ref:`float<class_float>`                        | :ref:`resonance<class_AudioEffectFilter_property_resonance>` | ``0.5``    |
   +--------------------------------------------------+--------------------------------------------------------------+------------+

.. rst-class:: classref-section-separator

----

.. rst-class:: classref-descriptions-group

Enumerations
------------

.. _enum_AudioEffectFilter_FilterDB:

.. rst-class:: classref-enumeration

enum **FilterDB**: :ref:`🔗<enum_AudioEffectFilter_FilterDB>`

.. _class_AudioEffectFilter_constant_FILTER_6DB:

.. rst-class:: classref-enumeration-constant

:ref:`FilterDB<enum_AudioEffectFilter_FilterDB>` **FILTER_6DB** = ``0``

Cutting off at 6dB per octave.

.. _class_AudioEffectFilter_constant_FILTER_12DB:

.. rst-class:: classref-enumeration-constant

:ref:`FilterDB<enum_AudioEffectFilter_FilterDB>` **FILTER_12DB** = ``1``

Cutting off at 12dB per octave.

.. _class_AudioEffectFilter_constant_FILTER_18DB:

.. rst-class:: classref-enumeration-constant

:ref:`FilterDB<enum_AudioEffectFilter_FilterDB>` **FILTER_18DB** = ``2``

Cutting off at 18dB per octave.

.. _class_AudioEffectFilter_constant_FILTER_24DB:

.. rst-class:: classref-enumeration-constant

:ref:`FilterDB<enum_AudioEffectFilter_FilterDB>` **FILTER_24DB** = ``3``

Cutting off at 24dB per octave.

.. rst-class:: classref-section-separator

----

.. rst-class:: classref-descriptions-group

Property Descriptions
---------------------

.. _class_AudioEffectFilter_property_cutoff_hz:

.. rst-class:: classref-property

:ref:`float<class_float>` **cutoff_hz** = ``2000.0`` :ref:`🔗<class_AudioEffectFilter_property_cutoff_hz>`

.. rst-class:: classref-property-setget

- |void| **set_cutoff**\ (\ value\: :ref:`float<class_float>`\ )
- :ref:`float<class_float>` **get_cutoff**\ (\ )

Threshold frequency for the filter, in Hz.

.. rst-class:: classref-item-separator

----

.. _class_AudioEffectFilter_property_db:

.. rst-class:: classref-property

:ref:`FilterDB<enum_AudioEffectFilter_FilterDB>` **db** = ``0`` :ref:`🔗<class_AudioEffectFilter_property_db>`

.. rst-class:: classref-property-setget

- |void| **set_db**\ (\ value\: :ref:`FilterDB<enum_AudioEffectFilter_FilterDB>`\ )
- :ref:`FilterDB<enum_AudioEffectFilter_FilterDB>` **get_db**\ (\ )

Steepness of the cutoff curve in dB per octave, also known as the order of the filter. Higher orders have a more aggressive cutoff.

.. rst-class:: classref-item-separator

----

.. _class_AudioEffectFilter_property_gain:

.. rst-class:: classref-property

:ref:`float<class_float>` **gain** = ``1.0`` :ref:`🔗<class_AudioEffectFilter_property_gain>`

.. rst-class:: classref-property-setget

- |void| **set_gain**\ (\ value\: :ref:`float<class_float>`\ )
- :ref:`float<class_float>` **get_gain**\ (\ )

Gain amount of the frequencies after the filter.

.. rst-class:: classref-item-separator

----

.. _class_AudioEffectFilter_property_resonance:

.. rst-class:: classref-property

:ref:`float<class_float>` **resonance** = ``0.5`` :ref:`🔗<class_AudioEffectFilter_property_resonance>`

.. rst-class:: classref-property-setget

- |void| **set_resonance**\ (\ value\: :ref:`float<class_float>`\ )
- :ref:`float<class_float>` **get_resonance**\ (\ )

Amount of boost in the frequency range near the cutoff frequency.

.. |virtual| replace:: :abbr:`virtual (This method should typically be overridden by the user to have any effect.)`
.. |required| replace:: :abbr:`required (This method is required to be overridden when extending its base class.)`
.. |const| replace:: :abbr:`const (This method has no side effects. It doesn't modify any of the instance's member variables.)`
.. |vararg| replace:: :abbr:`vararg (This method accepts any number of arguments after the ones described here.)`
.. |constructor| replace:: :abbr:`constructor (This method is used to construct a type.)`
.. |static| replace:: :abbr:`static (This method doesn't need an instance to be called, so it can be called directly using the class name.)`
.. |operator| replace:: :abbr:`operator (This method describes a valid operator to use with this type as left-hand operand.)`
.. |bitfield| replace:: :abbr:`BitField (This value is an integer composed as a bitmask of the following flags.)`
.. |void| replace:: :abbr:`void (No return value.)`