| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide entropy encoding by adaptation of encoding between a level mode and a run length/run level mode. <P>SOLUTION: An audio encoder performs adaptive entropy encoding of audio data. For example, an audio encoder switches between variable dimension vector Huffman coding of direct levels of quantized audio data and run-level coding of run lengths and levels of quantized audio data. The encoder can use, for example, context-based arithmetic coding for coding run lengths and levels. The encoder can determine when to switch between coding modes by counting consecutive coefficients having a predominant value (e.g., zero). An audio decoder is performed corresponding to adaptive entropy decoding. <P>COPYRIGHT: (C)2004,JPO&NCIPI</p> |
