IMPROVED CODING DECODING OF DIGITAL AUDIO SIGNALS

专利名称：IMPROVED CODING /DECODING OF DIGITAL

AUDIO SIGNALS

发明人：VIRETTE, DAVID,RAGOT, STEPHANE,KOVESI,

BALAZS,BERTHET, PIERRE

申请号：EP10745327.6申请日：20100625公开号：EP2452336B1公开日：20131127

摘要：A method of hierarchical coding of a digital audio frequency input signal intoseveral frequency sub-bands, including a core coding of the input signal according to afirst throughput and at least one enhancement coding of higher throughput, of a residualsignal. The core coding uses a binary allocation according to an energy criterion. Themethod includes for the enhancement coding: calculating a frequency-based maskingthreshold for at least part of the frequency bands processed by the enhancementcoding; determining a perceptual importance per frequency sub-band as a function of themasking threshold and as a function of the number of bits allocated for the core coding;binary allocation of bits in the frequency sub-bands processed by the enhancementcoding, as a function of the perceptual importance determined; and coding the residualsignal according to the bit allocation. Also provided are a decoding method, a coder anda decoder.

申请人：ORANGE,ORANGE,ORANGE

地址：FR

国籍：FR

代理机构：Froger, Marie-Hélène

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