共查询到17条相似文献,搜索用时 125 毫秒
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为了减少功耗与降低成本,根据ARM芯片对C语言良好支持的特点,在深度剖析MP3解码算法、分析C语言在ARM芯片上编程的优化方法的基础上,通过软件形式实现MP3音频解码器,使一些无硬件解码器支持的ARM嵌入式系统完成MP3解码任务,从而实现基于ARM的嵌入式系统的MP3软解码器,可以有效地降低系统功耗,提高解码效率,更好地扩展和增强便携嵌入式系统多媒体功能。 相似文献
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Viterbi解码器RTL级设计优化 总被引:1,自引:0,他引:1
当今芯片产业竞争激烈,速度低、面积大、功耗高的产品难以在市场中占有一席之地。Viterbi解码器作为一种基于最大后验概率的最优化卷积码解码器,被广泛应用于多种数字通信系统中,却由于其较高算法复杂程度,给芯片设计带来了挑战。针对芯片的速度、面积和功耗,通过对Viterbi解码器RTL级设计的若干优化方法进行研究和讨论,实现了一个应用于DVB-S系统的面积约为2万门的Viterbi解码器。 相似文献
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Area-efficient design methodology is proposed for the analog decoding implementations of the rate-½ accumulate repeat-4 jagged-accumulate (AR4JA) low density parity check (LDPC) code. The proposed approach is designed using optimized decoding architecture and regularized routing network, in such a way that the overall wiring overhead is minimized and the silicon area utilization is significantly improved. The prototyping chip used to verify the approach is fully integrated in a four-metal double-poly 0.35 μm complementary metal oxide semiconductor (CMOS) technology, and includes an input-output interface that maximizes the decoder throughput. The decoding core area is 2.02 mm2 with a post-layout area utilization of 80%. The decoder was successfully tested at the maximum data rate of 10 Mbit/s, with a core power consumption of 6.78 mW at 3.3 V, which corresponds to an energy per decoded bit of 0.677 nJ. The proposed analog LDPC decoder with low processing power and high-reliability is suitable for space- and power-constrained spacecraft system. 相似文献
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《Solid-State Circuits, IEEE Journal of》1981,16(2):73-79
Describes the architecture and circuit design technology for a low-power single-channel PCM CODEC and filter system. This system consists of 2 CMOS LSIs-the encoder/decoder chip using the C-R D/A conversion technique and the dual channel filter chip using the switched capacitor technique. Experimental results show how these operate with 71 mW power consumption and meet the requirements. 相似文献
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Jie Jin Chi-ying Tsui 《Very Large Scale Integration (VLSI) Systems, IEEE Transactions on》2007,15(10):1172-1176
In this paper, a low-power Viterbi decoder design based on scarce state transition (SST) is presented. A low complexity algorithm based on a limited search algorithm, which reduces the average number of the add-compare-select computation of the Viterbi algorithm, is proposed and seamlessly integrated with the SST-based decoder. The new decoding scheme has low overhead and facilitates low-power implementation for high throughput applications. We also propose an uneven-partitioned memory architecture for the trace-back survivor memory unit to reduce the overall memory access power. The new Viterbi decoder is designed and implemented in TSMC 0.18-mum CMOS process. Simulation results show that power consumption is reduced by up to 80% for high throughput wireless systems such as Multiband-OFDM Ultra-wideband applications. 相似文献