DAB+音频解码器中TNS模块优化设计及硬件实现

Optimization and Hardware Implementation of TNS Decoding for DAB+ Aduido Decoder

时域噪声整形技术被广泛地应用于各种感知音频编解码方案中,能有效地消除由量化噪声所产生的预回声现象。由于数字音频广播音频解码器(HE-AAC v2)算法复杂、运算量大,目前多采用DSP或嵌入式软件方式实现,本设计基于数字音频广播音频解码纯硬件系统,通过对时域噪声整形(TNS)解码算法的优化,以极低的硬件代价完成了时域噪声整形全硬件解码模块设计,具有高硬件资源利用率、低复杂度、高解码效率等特点。

The technology of temporal noise shape,which can eliminate the pre-echo phenomenon caused by quantization noise,is widly used in all kinds of perceptual audio coding and decoding system.As the high algorithm complexity and large compuation of digital audio broadcast（DAB） audio decoder（HE-AAC v2）,it was mostly implemented by methods of DSP and embeded software.This hardware Temporal Noise Shape（TNS）decoding module is implemented with low hardware source,based on the hardware system of DAB audio decoder,by optimizing the TNS decoding algorithm,and with these characteristicals of high hardware utilization,low system complexity,and high decoding efficiency.