GUSTATORY RESPONSES OF NEURONS IN THE PARABRACHIAL NUCLEUS OF RATS

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Error Robust H. 264 Video Transmission Schemes Based on Multi-frame

Multi-frame coding is supported by the emerging H. 264. It is important for the enhancement of both coding efficiency and error robustness. In this paper, error resilient schemes for H. 264 based on multi frame were investigated. Error robust H. 264 video transmission schemes were introduced for the applications with and without a feedback channel. The experimental results demonstrate the effectiveness of the proposed schemes.     

基于冗余编码系统的循环冗余校验方法

提出了一种基于冗余编码系统的循环冗余校验(CRC)方法。该方法应用于轨道交通信号控制系统中可解决冗余编码系统与其他类型冗余编码或非冗余编码系统的通信问题,通过将冗余码校验信息融合到CRC计算过程中,在无故障的情况下得出的冗余码CRC与标准CRC完全一致,保证了系统与外界系统的正常通信功能;在系统发生故障的情况下能够将错误信息反馈到冗余码CRC中,外界冗余/非冗余系统可校验出故障信息,提高了系统的安全性和故障可检测率。     

基于多描述编码的自恢复脆弱水印算法

兼顾水印嵌入容量和篡改恢复质量,基于多描述编码提出一种自适应图像内容的可恢复脆弱水印算法。该算法在图像块自适应分类的基础上,将图像块的DCT系数分为两个独立且互补的变长描述编码,每个描述能独立地近似恢复图像块的内容,两个描述编码一起得到的恢复质量更高。水印嵌入时,两个描述编码基于密钥随机嵌在不同图像块中,以提高算法在不同攻击下的篡改检测性能。被篡改图像块,只要有一个描述有效即可恢复该篡改块,若两个描述同时有效,可进一步提高篡改块的恢复质量,有效缓解了同步攻击与数据浪费之间的矛盾。实验结果证明,该算法不仅有效降低了生成的恢复水印容量,同时提高了不同攻击下的篡改检测性能和篡改恢复质量。     

ZPW-2000A电码化故障处理方法探讨

以测量ZPW-2000A系统的发生器、发送通道、检测盘等设备关键部位的电压为依据,配合控制台各类报警以及现场导通过程积累的经验,阐述ZPW-2000A闭环电码化故障的处理方法。     

ZPW-2000A闭环电码化系统分析及改进方案

对ZPW-2000A闭环电码化问题进行分析,并提出改进方案。     

基于TCM的OFDM空时编码传输系统性能

在网格编码调制（TCM）技术的基本原理上，将OFDM和空时编码技术与之相结合，提出了一种新的TCM—OFDM—STBC联合传输系统。并在适合IEEE802．16标准的SUI3信道模型下，对此系统进行了仿真。仿真结果表明，这种改进的联合传输方案，可以极大地降低系统的误码率（BER），并在不增加系统带宽的前提下，取得较大的编码增益。     

A New Region-of-interest Coding Method to Control the Relative Quality of Progressive Decoded Images

Based on the ideas of controlling relative quality and rearranging bitplanes, a new ROI coding method for JPEG2000 was proposed, which shifts and rearranges bitplanes in units of bitplane groups. It can code arbitrary shaped ROI without shape coding, and reserve almost arbitrary percent of background information. It also can control the relative quality of progressive decoded images. In addition, it is easy to be implemented and has low computational cost.     

An Adaptive Joint Source/Channel Coding Using Error Correcting Arithmetic Codes

An approximately optimal adaptive arithmetic coding (AC) system using a forbidden symbol (FS) over noisy channels was proposed which allows one to jointly and adaptively design the source decoding and channel correcting in a single process, with superior performance compared with traditional separated techniques. The concept of adaptiveness is applied not only to the source model but also to the amount of coding redundancy. In addition, an improved branch metric computing algorithm and a faster sequential searching algorithm compared with the system proposed by Grangetto were proposed. The proposed system is tested in the case of image transmission over the AWGN channel, and compared with traditional separated system in terms of packet error rate and complexity. Both hard and soft decoding were taken into account.     

Improved Sinusoid Analysis and Post-Processing in Parametric Audio Coding

This paper proposed improvements to the low bit rate parametric audio coder with sinusoid model as its kernel. Firstly, we propose a new method to effectively order and select the perceptually most important sinusoids. The sinusoid which contributes most to the reduction of overall NMR is chosen. Combined with our improved parametric psychoacoustic model and advanced peak riddling techniques, the number of sinusoids required can be greatly reduced and the coding efficiency can be greatly enhanced. A lightweight version is also given to reduce the amount of computation with only little sacrifice of performance. Secondly, we propose two enhancement techniques for sinusoid synthesis: bandwidth enhancement and line enhancement. With little overhead, the effective bandwidth can be extended one more octave ; the timbre tends to sound much brighter, thicker and more beautiful.