A device and method is disclosed to correct intonation errors and generate vibrato in solo instruments and vocal performances in real time. The device determines the pitch of a musical note produced by voice or instrument and shifts the pitch of that note to produce a very high quality, high fidelity...http://www.google.fr/patents/US5973252?utm_source=gb-gplus-shareBrevet US5973252 - Pitch detection and intonation correction apparatus and method
Pitch detection and intonation correction apparatus and method
