基于FPGA的ASI信号接收与发送的实现

提出了一种用FPGA芯片代替Cypress公司的CY78933和CY78923芯片来实现ASI信号接收与发送的方案，详细阐述了DVB—ASI接口的硬件组成与FPGA实现，该接口符合DVB—ASI的接口规范，可实现270Mbps的信号传输，已经得到实际运用。     

Adaptive sparse system identification using normalized least mean fourth algorithm

Normalized least mean square (NLMS) was considered as one of the classical adaptive system identification algorithms. Because most of systems are often modeled as sparse, sparse NLMS algorithm was also applied to improve identification performance by taking the advantage of system sparsity. However, identification performances of NLMS type algorithms cannot achieve high‐identification performance, especially in low signal‐to‐noise ratio regime. It was well known that least mean fourth (LMF) can achieve high‐identification performance by utilizing fourth‐order identification error updating rather than second‐order. However, the main drawback of LMF is its instability and it cannot be applied to adaptive sparse system identifications. In this paper, we propose a stable sparse normalized LMF algorithm to exploit the sparse structure information to improve identification performance. Its stability is shown to be equivalent to sparse NLMS type algorithm. Simulation results show that the proposed normalized LMF algorithm can achieve better identification performance than sparse NLMS one. Copyright © 2013 John Wiley & Sons, Ltd.     

应用CPLD实现ASI-SPI接口转换的方法

遵照国家的DVB标准及SPI接口标准,提出一种不需要使用FIFO,就能恢复出SPI接口的PSYNC、DAVLID信号的方案.经硬件实现,仅使用CPLD芯片就能完成该功能,实时稳定地产生出PSYNC、DAVLID信号,避免了使用FPGA芯片及FIFO带来的高成本问题.对SPI时钟的恢复提出一种新的解决方法,简化了ASI-SPI转换卡的硬件设计.     

基于并播技术的DVB发送卡设计

介绍了并行广播技术,提出了作为大规模信源的并行数据如何通过MPEG-2传输流数据发送卡实现这种海量传输的硬件实现方案,并分析了设计要点.     

Efficient modification on PLLA by ozone treatment for biomedical applications

RGDS (Arg-Gly-Asp-Ser) is immobilized on poly(L-lactic acid) (PLLA) with ozone oxidation and the addition of an intermediate reactant, acryl succinimide (ASI) to promote the grafting efficiency. A DPPH (2,2-di(4-tert-octylphenyl)-1-picrylhydrazyl) assay has revealed that the peroxide concentration can be controlled by adjusting the ozone treatment time. The immobilization of ASI is verified by elemental analysis. The peptide concentrations are in the effective order, as shown by means of high performance liquid chromatography (HPLC), and the grafting efficiency is proven to be relatively high compared with the previous studies. The culture of rat osteosarcoma 17/2.8 (ROS), osteoblastic-like cells, demonstrates that the grafting of RGDS can enhance the attachment and osteogenesis of ROS cells on PLLA. With the addition of ASI, the cultured ROS cells express normal function in proliferation and mineralization. From in vivo experiments, ASI immobilized on the surface is shown to be biocompatible. These results lead to the conclusion that the ozone treatment with the intermediate reactant ASI is an efficient, biocompatible, and easily controllable procedure to modify PLLA. Furthermore, the immobilization of RGDS in significant amounts following the ozone oxidation could further promote the biocompatibility and the osteoinduction of PLLA.     

浅谈SDI、ASI在广播电视的应用

本文通过介绍SDI与ASI在制作和播出中的应用,阐述了两种接口的特点,以及如何确保SDI和ASI在广播电视数字化系统中正确应用。     

基于FPGA的视频接口转换实现

本文针对传统ASI(异步串行接口)到SPI(同步并行接口)转换实现方案中的不足,提出了采用FGPA实现ASI到SPI转换的解决方法。文中详细描述了各功能模块的实现细节,包括高速串行数据流的提取、字节边界对齐、串并转换、8B/10B解码、SPI时钟产生以及生成符合SPI协议的数据流,最后采用verilog HDL实现整个设计,给出了其在ModelSim6．0中的时序仿真结果。     

新型高速DVB-ASI接口的设计与实现

介绍了一种新型的ASI接口的设计与实现。以Cypress公司的CY78933为基础，辅之以CPLD和FIFO，实现了ASI信号与TI的TMS320C6416的接口设计。该接口符合DVB—ASI的接口规范，可实现270Mbps的MPEG-2传输流传输。以文中实现的DVB-ASI接口为重点，详细阐述了其软、硬件组成与实现；最后，给出了DVB—ASI的测试实验。     

市-县有线数字电视传输系统浅析

针对地市建设有线数字电视统一服务平台的要求，对通过DS3接口传输、ATM over SDH，ASI接口传输，QAM调制等几种有线数字电视传输方法进行可行性探讨。     

ASI-SPI接口转换实现方法

本文给出了ASI接口和SPI接口互相转换的实现方案。其中，ASI转SPI接口时，往往需要精确恢复出TS流的字节时钟，这是ASI转SPI接口的难点之一。本方案采用DDS芯片，分别采用乘除法计算出DDS的控制字，并用FPGA实现其逻辑。