Block size determination and adaptation method for audio transform coding

摘要

An effective block size determination methods are disclosed for hybrid coding, especially for ATRAC codec system. They are an improved subframe division method, and peak energy centered method. The accurate detection of an attack signal is very important in a hybrid audio coding system, in order to eliminate or reduce significantly the pre-echo noise. These methods, compared with the prior art, can provide a more accurate block size determination, and have similar level of complexity as the prior art. <IMAGE>