gistfile1.txt

 def converted
   low_pass!(buffer, 4000)

   new_number_of_samples = ((8000.0 / 44100.0) * number_of_samples).ceil
   period     = 1 / buffer.sample_rate.to_f
   new_period = 1 / target_sample_rate.to_f

   new_number_of_samples.times do |m|
     sum = 0
     number_of_samples.times do |n|
       blob = ((m * new_period) - (n * period)) / period
       sum += buffer[n] * Math.sin(blob)/blob
     end
     downsampled[m] = sum
   end
   downsampled
 end