In a music apparatus 50 of this invention, digital data received at a digital input terminal 20 are stored in a primary memory area 22a on a hard disk drive 22. Subsequently, a music data converter 23 performs a predetermined conversion of the digital data stored in the primary memory area 22a to obtain...http://www.google.fr/patents/US6573444?utm_source=gb-gplus-shareBrevet US6573444 - Music data compression apparatus and method
