Class: SynthBlocks::Drum::Hihat

Inherits:
Core::Sound show all
Defined in:
lib/synth_blocks/drum/hihat.rb

Overview

Simple Hihat generator Nois > Filter > Amp

Instance Attribute Summary

Attributes inherited from Core::Sound

#mode

Instance Method Summary collapse

Methods inherited from Core::Sound

#active_events, #get, #live_params, #release, #set, #start, #stop

Constructor Details

#initialize(sfreq, preset = {}) ⇒ Hihat

parameters

flt_frequency - center frequency of the bandpass filter

flt_Q - Q (resonance) value of the bandpass filter

amp_attack - attack time in seconds

amp_decay - decay time in seconds



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# File 'lib/synth_blocks/drum/hihat.rb', line 20

def initialize(sfreq, preset = {})
  super(sfreq, mode: :polyphonic)
  @filter = SynthBlocks::Core::StateVariableFilter.new(sfreq)
  @preset = {
    flt_frequency: 10000,
    flt_Q: 2,
    amp_attack: 0.001,
    amp_decay: 0.1,
  }.merge(preset)
  @amp_env = SynthBlocks::Mod::Envelope.new(@preset[:amp_attack], @preset[:amp_decay])
end

Instance Method Details

#duration(_) ⇒ Object

:nodoc:



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# File 'lib/synth_blocks/drum/hihat.rb', line 32

def duration(_) # :nodoc:
  @preset[:amp_attack] + @preset[:amp_decay]
end

#run(offset) ⇒ Object

Run the generator (offset is given in samples)



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# File 'lib/synth_blocks/drum/hihat.rb', line 37

def run(offset)
  # time in seconds
  t = time(offset)
  events = active_events(t)
  if events.empty?
    0.0
  else
    event = events[events.keys.last]
    # lfo_out = (@lfo.run(@preset[:lfo_frequency], waveform: @preset[:lfo_waveform]) + 1) / 8 + 0.5
    local_started = t - event[:started]
    noise_out = rand * 2.0 - 1.0
    noise_out = @filter.run(noise_out, @preset[:flt_frequency], @preset[:flt_Q], type: :bandpass)
    0.3 * noise_out * @amp_env.run(local_started)
  end
end