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Contents
require File.expand_path(File.dirname(__FILE__) + '/../../spec_helper')
require 'gnuplot'
require 'pry'
describe 'cookbook filter' do
it 'should produce a nice frequency response graph' do
#sample_rate = 4000.0
#crit_freq = 400.0
#min_test_freq = 10.0
#max_test_freq = (sample_rate / 2.0) - 1.0
#bw = 0.3
#
#[SPCore::CookbookLowpassFilter, SPCore::CookbookHighpassFilter, SPCore::CookbookBandpassFilter].each do |filter_class|
# filter = filter_class.new sample_rate
# filter.set_critical_freq_and_bw crit_freq, bw
#
# freq_response = {}
# Scale.exponential(min_test_freq..max_test_freq, 200).each do |freq|
# mag = filter.get_freq_magnitude_response freq
# freq_response[freq] = SPCore::Gain.linear_to_db(mag)
# end
#
# plotter = Plotter.new(
# :title => "Frequency Magnitude Response for #{filter_class} with critical freq of #{crit_freq}",
# :logscale => "x"
# )
# plotter.plot_2d "magnitude (dB)" => freq_response
#end
end
end
Version data entries
4 entries across 4 versions & 1 rubygems