| 摘要 |
PROBLEM TO BE SOLVED: To provide entropy coding by adapting coding between level and run-length/level modes. SOLUTION: An audio encoder performs adaptive entropy encoding of audio data. For example, the 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 performs corresponding to adaptive entropy decoding. COPYRIGHT: (C)2010,JPO&INPIT |
