Class: Zerbo::Waveform

Inherits:

Packet

• Object
• Packet
• Zerbo::Waveform

Defined in:

lib/zerbo.rb

Instance Attribute Summary

Attributes inherited from Packet

#data, #owner, #sequence, #type

Instance Method Summary

• #filtered ⇒ Object
• #inspect ⇒ Object
• #raw ⇒ Object
• #to_a ⇒ Object

Methods inherited from Packet

#guess_length, inherited, #initialize, #to_i

Constructor Details

This class inherits a constructor from Zerbo::Packet

Instance Method Details

#filtered ⇒ Object

# File 'lib/zerbo.rb', line 162

def filtered
  unless @filtered
    # blindly stolen from the Python library.
    filter = [
      0.0056, 0.0190, 0.0113, -0.0106, 0.0029, 0.0041,
      -0.0082, 0.0089, -0.0062, 0.0006, 0.0066, -0.0129,
      0.0157, -0.0127, 0.0035, 0.0102, -0.0244, 0.0336,
      -0.0323, 0.0168, 0.0136, -0.0555, 0.1020, -0.1446,
      0.1743, 0.8150, 0.1743, -0.1446, 0.1020, -0.0555,
      0.0136, 0.0168, -0.0323, 0.0336, -0.0244, 0.0102,
      0.0035, -0.0127, 0.0157, -0.0129, 0.0066, 0.0006,
      -0.0062, 0.0089, -0.0082, 0.0041, 0.0029, -0.0106,
      0.0113, 0.0190, 0.0056
    ]
    p = raw.length
    q = filter.length
    n = p + q - 1
    @filtered = []
    n.times do |k|
      t = 0
      lower = [0, k-(q-1)].max
      upper = [p-1, k].min
      lower.upto(upper) do |i|
        t = t + raw[i] * filter[k-i]
      end
      @filtered << (t*1e6).round/1e6
    end
  end
  @filtered
end

#inspect ⇒ Object

# File 'lib/zerbo.rb', line 197

def inspect
  format_inspect(raw.inspect[1..-2])
end

#raw ⇒ Object

# File 'lib/zerbo.rb', line 156

def raw
  data.unpack('v128').map do |v|
    v > 0x7fff ? -0x10000 ^ v : v
  end
end

#to_a ⇒ Object

# File 'lib/zerbo.rb', line 193

def to_a
  filtered[90...218]
end