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109 lines
4.1 KiB
ReStructuredText
109 lines
4.1 KiB
ReStructuredText
:github_url: hide
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.. _class_AudioEffectHardLimiter:
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AudioEffectHardLimiter
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======================
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**繼承：** :ref:`AudioEffect<class_AudioEffect>` **<** :ref:`Resource<class_Resource>` **<** :ref:`RefCounted<class_RefCounted>` **<** :ref:`Object<class_Object>`
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為音訊匯流排新增硬限制器效果。
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.. rst-class:: classref-introduction-group
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說明
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----
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限制器能阻止音量超過指定門檻。硬限制器會預測峰值，於碰觸天花板前平順地降低增益，避免削波與失真；並維持波形不超出門檻。建議在 Master 匯流排加入一個硬限制器，作為防止突波與削波失真的保護機制。
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.. rst-class:: classref-introduction-group
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教學
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----
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- :doc:`音訊匯流排 <../tutorials/audio/audio_buses>`
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.. rst-class:: classref-reftable-group
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屬性
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----
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.. table::
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:widths: auto
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+---------------------------+-----------------------------------------------------------------------+----------+
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| :ref:`float<class_float>` | :ref:`ceiling_db<class_AudioEffectHardLimiter_property_ceiling_db>` | ``-0.3`` |
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+---------------------------+-----------------------------------------------------------------------+----------+
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| :ref:`float<class_float>` | :ref:`pre_gain_db<class_AudioEffectHardLimiter_property_pre_gain_db>` | ``0.0`` |
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+---------------------------+-----------------------------------------------------------------------+----------+
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| :ref:`float<class_float>` | :ref:`release<class_AudioEffectHardLimiter_property_release>` | ``0.1`` |
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+---------------------------+-----------------------------------------------------------------------+----------+
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.. rst-class:: classref-section-separator
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----
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.. rst-class:: classref-descriptions-group
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屬性說明
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--------
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.. _class_AudioEffectHardLimiter_property_ceiling_db:
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.. rst-class:: classref-property
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:ref:`float<class_float>` **ceiling_db** = ``-0.3`` :ref:`🔗<class_AudioEffectHardLimiter_property_ceiling_db>`
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.. rst-class:: classref-property-setget
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- |void| **set_ceiling_db**\ (\ value\: :ref:`float<class_float>`\ )
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- :ref:`float<class_float>` **get_ceiling_db**\ (\ )
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波形允許的最大值（分貝）。可設定範圍為 ``-24.0`` 到 ``0.0``\ 。
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預設值 ``-0.3`` 可防止跨取樣峰值 (ISP) 超過 0 dB，避免部分舊硬體產生輕微失真。
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.. rst-class:: classref-item-separator
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----
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.. _class_AudioEffectHardLimiter_property_pre_gain_db:
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.. rst-class:: classref-property
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:ref:`float<class_float>` **pre_gain_db** = ``0.0`` :ref:`🔗<class_AudioEffectHardLimiter_property_pre_gain_db>`
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.. rst-class:: classref-property-setget
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- |void| **set_pre_gain_db**\ (\ value\: :ref:`float<class_float>`\ )
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- :ref:`float<class_float>` **get_pre_gain_db**\ (\ )
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限制前的前級增益（dB）。
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.. rst-class:: classref-item-separator
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----
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.. _class_AudioEffectHardLimiter_property_release:
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.. rst-class:: classref-property
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:ref:`float<class_float>` **release** = ``0.1`` :ref:`🔗<class_AudioEffectHardLimiter_property_release>`
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.. rst-class:: classref-property-setget
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- |void| **set_release**\ (\ value\: :ref:`float<class_float>`\ )
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- :ref:`float<class_float>` **get_release**\ (\ )
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增益完全復原所需時間（秒）。
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.. |virtual| replace:: :abbr:`virtual (本方法通常需要使用者覆寫才能生效。)`
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.. |required| replace:: :abbr:`required (This method is required to be overridden when extending its base class.)`
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.. |const| replace:: :abbr:`const (本方法沒有副作用。不會修改該實例的任何成員變數。)`
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.. |vararg| replace:: :abbr:`vararg (本方法除了這裡描述的參數外，還可以接受任意數量的參數。)`
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.. |constructor| replace:: :abbr:`constructor (本方法用於建構一個型別。)`
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.. |static| replace:: :abbr:`static (本方法無需實例即可呼叫，因此可以直接使用類別名稱呼叫。)`
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.. |operator| replace:: :abbr:`operator (本方法描述將本型別作為左運算元時可用的有效運算子。)`
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.. |bitfield| replace:: :abbr:`BitField (此值是由下列旗標組成的位元遮罩整數。)`
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.. |void| replace:: :abbr:`void (無回傳值。)`
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