swift - 是否可以使用 AKEqualizerFilter 过滤频率？

Question

我在我的项目中使用 AKEqualizerFilter 来自 amazing AudioKit framework 并且一切正常，除了频率降低.在 AudioKit GitHub-website 上显示，-100 和 100 之间的增益降低是可能的，但是当我低于 0 时，频率再次变大。

如何使用 AKEqualiserFilter 将所选频率的增益降低到 0 ？

这是来自 AKEqualizerFilter 分支:

https://github.com/AudioKit/AudioKit/blob/master/AudioKit/Common/Nodes/Effects/Filters/Equalizer%20Filter/AKEqualizerFilter.swift

/// A 2nd order tunable equalization filter that provides a peak/notch filter
/// for building parametric/graphic equalizers. With gain above 1, there will be
/// a peak at the center frequency with a width dependent on bandwidth. If gain
/// is less than 1, a notch is formed around the center frequency.
///


/// Lower and upper bounds for Gain
    public static let gainRange = -100.0 ... 100.

My Code:

        myEqualiserFilter1 = AKEqualizerFilter(myCompressor)
        myEqualiserFilter1.rampDuration = 0.3
        myEqualiserFilter1.centerFrequency = 50 
        myEqualiserFilter1.bandwidth = 50 
        kickEqualiserFilter1.gain = 0.0


//Slider action: 
conductor.kickEqualiserFilter1.gain = Double(sender.value)

我想从音频样本中过滤/减少频率，我希望这可以通过 AudioKit 实现。

Answer 1

AudioKit 中的范围不正确，应该是一个非负数。我已经在开发分支上更改了它。

https://github.com/AudioKit/AudioKit/commit/b811ac146e95d3666695dba59c6cd87593223066

零增益是该带宽的最大减少。