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.. Generated automatically by doc/tools/make_rst.py in Godot's source tree.
.. DO NOT EDIT THIS FILE, but the AudioEffectSpectrumAnalyzer.xml source instead.
.. The source is found in doc/classes or modules/<name>/doc_classes.

.. _class_AudioEffectSpectrumAnalyzer:

AudioEffectSpectrumAnalyzer
===========================

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

Audio effect that can be used for real-time audio visualizations.

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

This audio effect does not affect sound output, but can be used for real-time audio visualizations.

See also :ref:`AudioStreamGenerator<class_AudioStreamGenerator>` for procedurally generating sounds.

Tutorials
---------

- `Audio Spectrum Demo <https://godotengine.org/asset-library/asset/528>`__

- `Godot 3.2 will get new audio features <https://godotengine.org/article/godot-32-will-get-new-audio-features>`__

Properties
----------

+----------------------------------------------------------+--------------------------------------------------------------------------------+----------+
| :ref:`float<class_float>`                                | :ref:`buffer_length<class_AudioEffectSpectrumAnalyzer_property_buffer_length>` | ``2.0``  |
+----------------------------------------------------------+--------------------------------------------------------------------------------+----------+
| :ref:`FFTSize<enum_AudioEffectSpectrumAnalyzer_FFTSize>` | :ref:`fft_size<class_AudioEffectSpectrumAnalyzer_property_fft_size>`           | ``2``    |
+----------------------------------------------------------+--------------------------------------------------------------------------------+----------+
| :ref:`float<class_float>`                                | :ref:`tap_back_pos<class_AudioEffectSpectrumAnalyzer_property_tap_back_pos>`   | ``0.01`` |
+----------------------------------------------------------+--------------------------------------------------------------------------------+----------+

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

.. _enum_AudioEffectSpectrumAnalyzer_FFTSize:

.. _class_AudioEffectSpectrumAnalyzer_constant_FFT_SIZE_256:

.. _class_AudioEffectSpectrumAnalyzer_constant_FFT_SIZE_512:

.. _class_AudioEffectSpectrumAnalyzer_constant_FFT_SIZE_1024:

.. _class_AudioEffectSpectrumAnalyzer_constant_FFT_SIZE_2048:

.. _class_AudioEffectSpectrumAnalyzer_constant_FFT_SIZE_4096:

.. _class_AudioEffectSpectrumAnalyzer_constant_FFT_SIZE_MAX:

enum **FFTSize**:

- **FFT_SIZE_256** = **0** --- Use a buffer of 256 samples for the Fast Fourier transform. Lowest latency, but least stable over time.

- **FFT_SIZE_512** = **1** --- Use a buffer of 512 samples for the Fast Fourier transform. Low latency, but less stable over time.

- **FFT_SIZE_1024** = **2** --- Use a buffer of 1024 samples for the Fast Fourier transform. This is a compromise between latency and stability over time.

- **FFT_SIZE_2048** = **3** --- Use a buffer of 2048 samples for the Fast Fourier transform. High latency, but stable over time.

- **FFT_SIZE_4096** = **4** --- Use a buffer of 4096 samples for the Fast Fourier transform. Highest latency, but most stable over time.

- **FFT_SIZE_MAX** = **5** --- Represents the size of the :ref:`FFTSize<enum_AudioEffectSpectrumAnalyzer_FFTSize>` enum.

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

.. _class_AudioEffectSpectrumAnalyzer_property_buffer_length:

- :ref:`float<class_float>` **buffer_length**

+-----------+--------------------------+
| *Default* | ``2.0``                  |
+-----------+--------------------------+
| *Setter*  | set_buffer_length(value) |
+-----------+--------------------------+
| *Getter*  | get_buffer_length()      |
+-----------+--------------------------+

The length of the buffer to keep (in seconds). Higher values keep data around for longer, but require more memory.

----

.. _class_AudioEffectSpectrumAnalyzer_property_fft_size:

- :ref:`FFTSize<enum_AudioEffectSpectrumAnalyzer_FFTSize>` **fft_size**

+-----------+---------------------+
| *Default* | ``2``               |
+-----------+---------------------+
| *Setter*  | set_fft_size(value) |
+-----------+---------------------+
| *Getter*  | get_fft_size()      |
+-----------+---------------------+

The size of the `Fast Fourier transform <https://en.wikipedia.org/wiki/Fast_Fourier_transform>`__ buffer. Higher values smooth out the spectrum analysis over time, but have greater latency. The effects of this higher latency are especially noticeable with sudden amplitude changes.

----

.. _class_AudioEffectSpectrumAnalyzer_property_tap_back_pos:

- :ref:`float<class_float>` **tap_back_pos**

+-----------+-------------------------+
| *Default* | ``0.01``                |
+-----------+-------------------------+
| *Setter*  | set_tap_back_pos(value) |
+-----------+-------------------------+
| *Getter*  | get_tap_back_pos()      |
+-----------+-------------------------+

.. |virtual| replace:: :abbr:`virtual (This method should typically be overridden by the user to have any effect.)`
.. |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.)`