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AudioEffectLowPassFilter
继承： AudioEffectFilter < AudioEffect < Resource < RefCounted < Object
向音频总线添加一个低通滤波器。
描述
“低通”滤波器衰减高于 AudioEffectFilter.cutoff_hz 的频率，并允许更低频率的信号原样通过。
该滤波器可用于使声音变得低沉。