Kengo Fujita Tsuneo Kato Hideaki Yamada Hisashi Kawai SNR-dependent background noise compensation of PESQ values for cellular phone speech. 3165 2005 INTERSPEECH http://www.isca-speech.org/archive/interspeech_2005/i05_3165.html conf/interspeech/2005 db/conf/interspeech/interspeech2005.html#FujitaKYK05