class AudioStream::Fx::NoiseGate
Public Class Methods
new(threshold: 0.01)
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# File lib/audio_stream/fx/noise_gate.rb, line 4 def initialize(threshold: 0.01) @threshold = threshold @window = HanningWindow.instance end
Public Instance Methods
process(input)
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# File lib/audio_stream/fx/noise_gate.rb, line 9 def process(input) window_size = input.window_size channels = input.channels # fft input = @window.process(input) na = input.to_float_na fft = FFTW3.fft(na, FFTW3::FORWARD) / na.length fft.size.times {|i| if fft[i].abs < @threshold fft[i] = 0i end } wet_na = FFTW3.fft(fft, FFTW3::BACKWARD) Buffer.from_na(wet_na) end