10. The computer program product of claim 7 , wherein a reference waveform is provided for each character in a character set.
10. The computer program product of claim 7 , wherein a reference waveform is provided for each character in a character set. 11. The computer program product of claim 10 , wherein the program code configured for comparing the normalized set of Fourier components with each of a set of reference waveforms calculates a difference between the normalized set of Fourier components and each reference waveform.