12. The apparatus according to claim 11 , wherein the fault-tolerant tempo word generating unit comprises: a first fault-tolerant subunit, configured to select one or more tempo scales contained in a first tempo word; and a second fault-tolerant subunit, configured to replace the tempo scales in said first tempo word with corresponding fault-tolerant tempo scales to generate a first fault-tolerant tempo word corresponding to the first tempo word.
12. The apparatus according to claim 11 , wherein the fault-tolerant tempo word generating unit comprises: a first fault-tolerant subunit, configured to select one or more tempo scales contained in a first tempo word; and a second fault-tolerant subunit, configured to replace the tempo scales in said first tempo word with corresponding fault-tolerant tempo scales to generate a first fault-tolerant tempo word corresponding to the first tempo word. 13. The apparatus according to claim 12 , wherein the fault-tolerant tempo word generating unit further comprises: a tempo scale ranking unit, configured to rank the tempo scales in said tempo scale set; and a fault-tolerant tempo scale determining unit, configured to determine, for each tempo scale contained in said first tempo word, a predetermined number of tempo scales ranked before or after the tempo scale, and configured to set the predetermined number of tempo scales as fault-tolerant tempo scales to replace the tempo scale in the first tempo word when generating the first fault-tolerant tempo word.