A pitch/tempo converting apparatus is constructed for concurrently changing a tempo and a pitch of an audio signal according to tempo designation information and pitch designation information. In the apparatus, a memory section memorizes the audio signal composed of original amplitude values sequentially...http://www.google.fr/patents/US5952596?utm_source=gb-gplus-shareBrevet US5952596 - Method of changing tempo and pitch of audio by digital signal processing
Method of changing tempo and pitch of audio by digital signal processing
