数字音频信号处理器理论及专用电路设计

Theory and Design of digital Audio Signal Processor

本文以高保真数字音频信号处理器的设计为核心。在理论方面:对理德—索罗门码(R-S码)推导出一些算法公式,依据此公式编制了P、Q编解码的一套程序系统。在解码算法中改进了钱搜索法,使搜索次数由256次压缩到4次,提高了运算速度,简化了硬件电路。在硬件方面:设计了伽罗华域运算器,本运算器仅用一个时钟周期就能进行伽域下的X·Y;XY;X·YZ;(XY)/Z等六种运算,实现了在解码过程中进行实时处理的要求。在电路调试方面:设计了微程序的编译软件包,实现了微程序编程自动化。用此软件包可对数字通讯、CD、DCC等不同格式的数字信号处理器进行编程、生产出相应的专用集成电路。该软、硬件电路设计可用于各种高保真数字音频电子仪器中进行纠错、检错、误码补偿等信号处理。

In this paper, the theory and design methods of digital audio signal processor for digital recorder (DAT. DCC)are discussed. A number of formulae for Reed-Solomon encoding and decoding are derived. Based on these formulae, a programming system of P.Q encoding and decoding is developed, and the programs are stored in EPROM. In decoding algorithm, the Qian-Search method is improved. The number of searches is reduced from 256 to only 4. Therefore the speed is increased and thd handware is simplified. The hardware of Gallos Field (GF) is implemented.The operations of X·Y; X Y; X ·Y Z; X Z · Y;X/Y Z;(X Y)/Z can be completed in one clock cycle. In circuit turning, a software package of compiling and explaining is developed. It is a general purpose program and can be used for programming of CD, DAT and DCC signal processor.