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AudioEffectBandPassFilter
继承： AudioEffectFilter < AudioEffect < Resource < RefCounted < Object
为音频总线添加一个带通滤波器。
描述
带通（Band-pass）滤波器允许 AudioEffectFilter.cutoff_hz 处的频率不受影响地通过，同时衰减该频率阈值之外的频率。它是 AudioEffectBandLimitFilter（带限滤波器）和 AudioEffectNotchFilter（陷波滤波器）的相反效果。
这种滤波器可以用来模拟声音从劣质扬声器中传出来的听感。