面向HDTV應用的音頻解碼軟硬件協(xié)同設計
The Hardware/Software Co-design of Audio Decoding Used in HDTV
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摘要: 該文以Dolby實驗室的音頻AC3算法為基礎，研究了在RISC核Virgo上HDTV音頻解碼的軟硬件協(xié)同設計方法，提出了通過對程序關鍵子函數(shù)建模來實現(xiàn)軟硬件劃分的軟硬件協(xié)同設計方法。即在軟件實現(xiàn)AC3解碼的基礎上，通過建立模型分析音頻程序的關鍵操作的方法來擴展RISC的指令集，從而加快了音頻解碼速度，減少了存儲空間，并在總體上減少了硬件開銷。其次，該文給出了部分擴展指令的具體硬件結構。最后，通過軟硬件協(xié)同評估的方法進行硬件改進后的軟硬件代價分析。Abstract: In this paper, Dolby AC3 standard is used as the audio decoding standard to research the hardware/software co-design method of HDTV audio decoding based on Virgo-IP-Core and a new method is present to realize the hardware/software partition by setting models for the key sub-functions of AC3 decoding program. That is, after decoding AC3 bit stream by software, the models are set up for the key sub-functions to get the extended instructions of RISC core. Through this extension, the speed of AC3 decoding is fastened, the memory space is reduced and the gates of the whole system are lessened. Next, the detail hardware of extended instruction is given. Finally, the performance of the whole system is analyzed by using the hardware/software co-evaluation method.
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