共查询到20条相似文献,搜索用时 156 毫秒
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基于VSl003解码器的MP3播放器设计 总被引:1,自引:0,他引:1
洪家平 《单片机与嵌入式系统应用》2010,(11):54-56
以MSP430F149作为核心控制器,结合VSl003音频解码器,设计了一种带SD卡的MP3播放器,给出了MP3播放系统的软硬件设计。在硬件设计上,解码器与存储器分离,增加了存储容量;在软件设计上,使用条项菜单方式进行管理,可以方便地进行硬件或软件的升级。经过测试,该MP3播放器播放效果较好。 相似文献
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引言目前,对于图片解码器的研究主要是针对PC环境,设计工作只是在原有基础上的升级,对系统和硬件的考虑较少,不能在嵌入式系统中直接实现。本文设计了一种嵌入式图片解码器。通过FatFs文件系统识别图片文件的格式,调用相应的格式解码单元实现图像重构,并在TFT液晶显示器上进行显示。1系统硬件设计系统的核心CPU采用LM3S8962,具有丰富的外围接口以及多种片内的硬件接口功能(如UART、SPII、2C、PWM等)。整个系统的硬件电路包括SD卡电路、TFT液晶显示电路、独立按键电路。1.1 SD卡电路SD卡有两种工作模式,即SD和SPI模式。由于LM3S8962具有SPI接口,为此该嵌入式系统采用S 相似文献
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根据AVS音视频解码标准提出的算法设计了一种SoC架构的AVS解码芯片设计方案。该方案能够有效的减小纯硬件实现AVS硬件解码器的复杂度。采用软硬件协同设计的思想,降低解码器设计的难度,同时提高解码的灵活性。 相似文献
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根据AVS音视频解码标准提出的算法设计了一种SoC架构的AVS解码芯片设计方案。该方案能够有效的减小纯硬件实现AVS硬件解码器的复杂度。采用软硬件协同设计的思想,降低解码器设计的难度,同时提高解码的灵活性。 相似文献
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We present a novel standard convolutional symbols generator (SCSG) block for a multi-parameter reconfigurable Viterbi decoder to optimize resource consumption and adaption of multiple parameters. The SCSG block generates all the states and calculates all the possible standard convolutional symbols corresponding to the states using an iterative approach. The architecture of the Viterbi decoder based on the SCSG reduces resource consumption for recalculating the branch metrics and rearranging the correspondence between branch metrics and transition paths. The proposed architecture supports constraint lengths from 3 to 9, code rates of 1/2, 1/3, and 1/4, and fully optional polynomials. The proposed Viterbi decoder has been implemented on the Xilinx XC7VX485T device with a high throughput of about 200 Mbps and a low resource consumption of 162k logic gates. 相似文献
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卷积编码及基于DSP的Viterbi译码器设计 总被引:3,自引:0,他引:3
卷积编码是前向纠错的差错控制编码方法之一, Viterbi译码是卷积码的一种杰出的译码算
法,它是一种最大似然算法,适于硬件实现.本设计中的Viterbi译码器是构建在台湾智源
科技的DSP芯片FD216之上的.在对Viterbi译码器测试时取一幅图像文件作为数据源,并用
软件方法模拟高斯白噪声信道.DSP芯片卓越的性能为我们提供了更深入的开发潜力. 相似文献
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在OFDM系统中,为了获得正确无误的数据传输,要采用差错控制编码技术。LTE中采用Viterbi和Turbo加速器来实现前向纠错。提出一种在FPGA中实现的基于软判决的Viterbi译码算法,并以一个(2,1,2)、回溯深度为10的软判决Viterbi译码算法为例验证该算法,在Xilinx的XC3S500E芯片上实现了该译码器,最后对其性能做了分析。 相似文献
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《Engineering Applications of Artificial Intelligence》2003,16(5-6):473-489
This paper presents a neural decoder for trellis coded modulation (TCM) schemes. Decoding is performed with Radial Basis Function Networks and Multi-Layer Perceptrons. The neural decoder effectively implements an adaptive Viterbi algorithm for TCM which learns communication channel imperfections. The implementation and performance of the neural decoder for trellis encoded 16-QAM with amplitude imbalance are analyzed. 相似文献
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吴亚婷 《数字社区&智能家居》2010,(4):878-879
提出了一种(2,1,7)卷积编码及其维特比(Viterbi)译码的软件实现方案,在Matlab环境中应用软件技术实现了(2,1,7)卷积码的Viterbi译码器功能。测试证明,该Viterbi译码算法在低信噪比下的误码率仍能达到10^-6。 相似文献
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维特比译码器是人们广泛采用的卷积码的译码器,在IS-95,GSM,3GPP中都有广泛的应用,本文根据TD-SCDMA卷积码编码方案设计了一种采用软判决方式的维特比译码器,并在实际芯片中得到了应用. 相似文献
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Iterative joint source-channel decoding of speech spectrum parameters over an additive white Gaussian noise channel 总被引:2,自引:0,他引:2
《IEEE transactions on audio, speech, and language processing》2006,14(1):152-162
In this paper, we show how the Gaussian mixture modeling framework used to develop efficient source encoding schemes can be further exploited to model source statistics during channel decoding in an iterative framework to develop an effective joint source-channel decoding scheme. The joint probability density function (PDF) of successive source frames is modeled as a Gaussian mixture model (GMM). Based on previous work, the marginal source statistics provided by the GMM is used at the encoder to design a low-complexity memoryless source encoding scheme. The source encoding scheme has the specific advantage of providing good estimates to the probability of occurrence of a given source code-point based on the GMM. The proposed iterative decoding procedure works with any channel code whose decoder can implement the soft-output Viterbi algorithm that uses a priori information (APRI-SOVA) or the BCJR algorithm to provide extrinsic information on each source encoded bit. The source decoder uses the GMM model and the channel decoder output to provide a priori information back to the channel decoder. Decoding is done in an iterative manner by trading extrinsic information between the source and channel decoders. Experimental results showing improved decoding performance are provided in the application of speech spectrum parameter compression and communication. 相似文献