公开(公告)号：US5719998A

公开(公告)日：1998-02-17

申请号：US489489

申请日：1995-06-12

申请人： Charlene S. Ku ,  Charles C. Stearns ,  Olive T. Tao

发明人： Charlene S. Ku ,  Charles C. Stearns ,  Olive T. Tao

IPC分类号： G10L19/02 ,  G06T9/00 ,  G10L19/00 ,  H03M7/30 ,  G10L7/04

CPC分类号： G06T9/007

摘要： Decompression of MPEG compressed audio data is performed in a computer system by the host processor in the computer system providing preprocessing data decompression and a dedicated audio decoder engine (which is a digital signal processor) performing the filtering and windowing of the host preprocessed data. The audio decoder engine includes a data path, instruction set, registers and internal program and data memory. The host performs a large portion of the audio decompression, leaving the windowing and filtering to the audio decoder engine. Thus the computationally intensive portions of the decompression are performed more efficiently. Coefficient storage in the audio decompression engine is optimized by taking advantage of the symmetries inherent in the coefficient data, both for the filter coefficients and the windowing coefficients. Double buffer input and output buffers speed the data flow between the host processor and the audio decoder engine. The double buffers allow a continuous flow of data from the host processor to the audio decoder engine.

摘要翻译： 通过提供预处理数据解压缩的计算机系统中的主处理器和执行主机预处理数据的过滤和加窗的专用音频解码器引擎（其是数字信号处理器）在计算机系统中执行MPEG压缩音频数据的压缩。 音频解码器引擎包括数据路径，指令集，寄存器以及内部程序和数据存储器。 主机执行音频解压缩的大部分，将音频解码引擎的窗口化和过滤保留下来。 因此，更有效地执行减压的计算密集部分。 音频解压缩引擎中的系数存储器通过利用系数数据固有的对称性来优化滤波器系数和加窗系数。 双缓冲器输入和输出缓冲器加速主处理器和音频解码器引擎之间的数据流。 双缓冲器允许从主处理器到音频解码器引擎的数据的连续流动。