A system and method is provided to produce a flatter frequency response from an audio source that has a non-flat frequency response and, as such, has missing spectral content. The system and method achieves a flatter frequency response by characterizing the frequency response of the audio source based...http://www.google.fr/patents/US7778718?utm_source=gb-gplus-shareBrevet US7778718 - Frequency normalization of audio signals
