Patent ID: 6349284
Filing Date: 2002-02-19
Classification: H04B

Abstract:
A scalable audio encoding method for coding audio signals into a layered data stream having a base layer and a plurality of enhancement layers, comprising the steps of:quantizing input audio signals for each of a plurality of predetermined coding bands; and generating bitstreams by packing the quantized data, wherein the bitstream generating step comprises: slicing said quantized data into sliced bits; coding sliced bits of the quantized data corresponding to the base layer; coding sliced bits of the quantized data corresponding to the first enhancement layer; and sequentially coding sliced bits of the quantized data corresponding to each subsequent enhancement layer to form bitstreams, wherein each of the base layer coding step, the first enhancement layer coding step and the sequential enhancement coding steps include (i) coding both side information and quantized data corresponding to each respective layer to be represented by digits of a same predetermined number; and (ii) arithmetic-coded using a predetermined probability model, and wherein the base layer coding step includes coding the most significant bits of the quantized data, the first enhancement layer coding step includes coding the next to most significant bits, and each subsequent enhancement coding steps includes coding progressively lower significant bits until the last enhancement layer includes coding the least significant bits.