Patent ID: 8386242

Claim:
A method of enhancing an acoustic signal to be input to a speaker, the method comprising: filtering, from the signal to be input to the speaker, a predetermined audio signal having a frequency less than or equal to a minimum reproduction frequency of the speaker; representing the predetermined audio signal as a plurality of harmonic signals that are generated based on the frequency of the predetermined audio signal; selecting, by way of a processor, one predetermined harmonic signal, from among the generated plurality of harmonic signals, the one predetermined harmonic signal having a greatest amplitude from among the generated plurality of harmonic signals; selecting, by way of a processor, only those harmonic signals from among the generated plurality of harmonic signals that exist in an area masked by the one predetermined harmonic signal; and outputting, to the speaker, harmonic signals remaining after excluding the selected harmonic signals from the generated plurality of harmonic signals to decrease a total harmonic distortion of the harmonic signals output to the speaker.