网上语音数据传输的Delphi实现技术

介绍并分析语音数据在网上的传递技术和应用，主要介绍用Delphi在网上开发语音传输程度的关键技术和技巧，详细介绍音频压缩管理器控件的应用。     

Novel Blind Robust Watermarking Based on Chaotic Mixing

This paper proposed a novel blind robust watermarking scheme. Multi-bits watermark is embedded in the chaotic mixed image blocks. Energy of the watermark is spread to all region of the blocks instead of some individual pixels, which entitles the watermark with imperceptibility and high robustness. A class of 1-D Markov chaotic maps is employed to perform image block mixing and watermark encryption ensures security of the system.To prove the validity of this proposed scheme, some objective comparisons with the popular spread spectrum scheme were also presented. The simulation results show that this scheme can survive processing such as high-ratio JPEG compression, Gaussian noise pollution and histogram equalization.     

山地小城市路网特征及脆弱点研究

山地路网建设是山地城镇与乡村快速发展的保障。山地道路桥隧占比高,对地形改造多,自然条件差,给山地路网增加了诸多风险。突发事件或自然灾害对山地小城市路网影响较大,会降低路网通行能力,甚至阻断通行。研究山地小城市路网脆弱点,提前加固,可提高路网抗干扰能力,保障城市交通安全、顺畅运行。     

基于CPCI的多通道短波通信控制平台开发

介绍用TI公司的数字信号处理器、XILINX公司的FPGA以及模拟点接触阵列MT8816为主体硬件构架，研制基于CPCI总线的多通道短波通信控制功能的通用硬件平台。用以实现对多路音频信号、数字信号的管理。     

A semi-fragile wavelet transform watermarking scheme for content authentication of images

A novel semi-fragile watermarking scheme for the content authentication of images using wavelet transform (WT) is presented in this paper. It is tolerant to the embedded wavelet image compression methods based on WT such as embedded zerotree wavelet (EZW), set partitioning in hierarchical trees (SPIHT) and embedded block coding with optimized truncation (EBCOT) in JPEG2000 to a pre-determined bit-plane, but is sensitive to all other malicious attacks. The image features are generated from the lowest-frequency (LF) subband of the original image as the embedded watermark. The watermark is embedded into the pre-determined bit-plane by adjusting the corresponding values in the given subband. In the process of watermarking authentication, we compare the image features generated from the LF subband of the received image with the embedded watermarking information (the image features of the original image) extracted from the pre-determined bit-plane in the given subband of the received image to decide whether the image is attacked maliciously or processed acceptably (the embedded wavelet compression). The most important advantage of our watermarking scheme is that the watermark information can be extracted from the watermarked image when detecting watermark, so the received image authentication needs no information about the original image or watermark. Experimental results prove the effectiveness of our proposed watermarking scheme.     

宁波万博推出汽车音响无损升级KOY音频处理模块

宁波万博新材料科技有限公司日前推出了具有多项发明专利的KOY音频处理模块，该产品以“聚能新材料”为基础，配上通过系统优化设计的全频域6．5英寸汽车扬声器，采用无损升级的方式，即可完成主机的音质升级。     

基于声波的潜艇应急通信技术研究

潜艇发生紧急情况时,需要封闭舱室。舱室封闭后,舱内舱外无法进行通信,这给救援行动的开展带来很大的困难。文章通过对各种形式的声波在钢板中的传播特性的研究,提出了一种基于声波传输的应急通信设备方案,可有效地解决潜艇救援中缺乏通信手段的问题。     

雅安～西昌高速公路桥梁建设新技术

雅安～西昌高速公路项目是国家高速公路网北京～昆明公路的重要路段,路线全长约240km。在麂子岗、大相岭、拖乌山、扯羊、勒不果喇吉和马鞍山共6次越岭,多次跨越水库、泥石流沟等生态脆弱地区,最大高差达1500m以上,     

数字水印技术研究

数字水印技术在数字化作品版权保护和内容认证方面发挥着重要的作用。章首先系统地介绍了数字水印技术的特点、分类及其应用领域，然后阐述了数字水印的模型，算法的分类和评价标准，分析了几种典型的水印算法。最后预测了数字水印技术的研究发展趋势．     

一种基于DWT和DCT域的灰度图像盲水印算法

本文提出了一种新的频域嵌入盲水印的方法,把DWT的低频子图作为待嵌入的图像,再在逼近子图DCT域进行嵌入,增强水印的稳健性同时,也增强了水印的不可见性。经对多幅图像进行实验证明,该算法不可见性好并且具有较强的鲁棒性。