class AudioStream::Fx::CombFilter
Public Class Methods
new(soundinfo, freq:, q:)
click to toggle source
@param soundinfo [AudioStream::SoundInfo] @param freq [AudioStream::Rate] frequency @param q [Float] Quality factor
# File lib/audio_stream/fx/comb_filter.rb, line 8 def initialize(soundinfo, freq:, q:) @window_size = soundinfo.window_size @delaysample = freq.sample(soundinfo).round @q = q @delaybufs = [ Vdsp::DoubleArray.new(soundinfo.window_size + @delaysample), Vdsp::DoubleArray.new(soundinfo.window_size + @delaysample), ] end
Public Instance Methods
process(input)
click to toggle source
# File lib/audio_stream/fx/comb_filter.rb, line 19 def process(input) window_size = input.window_size if @window_size!=window_size raise "window size is not match: impulse.size=#{@window_size} input.size=#{window_size}" end streams = input.streams.map.with_index {|src, i| buf = @delaybufs[i] Vdsp::UnsafeDouble.copy(buf, window_size, 1, buf, 0, 1, @delaysample) if @delaysample<window_size Vdsp::UnsafeDouble.vclr(buf, window_size, 1, @delaysample) end Vdsp::UnsafeDouble.vsmsma(src, 0, 1, 1.0, buf, 0, 1, @q, buf, @delaysample, 1, window_size) dst = buf[@delaysample, window_size] dst } Buffer.new(*streams) end