Kohei Furuya Tsuyoshi Moriyama Shinji Ozawa Generation of Speaker Mixture Voice using Spectrum Morphing. 344-347 2007 ICME http://dx.doi.org/10.1109/ICME.2007.4284657 conf/icmcs/2007 db/conf/icmcs/icme2007.html#FuruyaMO07