In order to improve the encoding quality of speech signal and save the resource of bandwidth,we added the method of wavelet-thresholding denoising based on the traditional CVSD coding.We first present soft-thresholding and hard-thresholding denoising methods in wavelet thresholding denoising,then it presents a new thresholding function based on them,we add a factor to the modified project,which can be self-adaptivly reduce the fixed deviation in soft-thresholding function.Subsequently,we encode and decode the speech signal which has been reconstructed based on CVSD.In this paper,we validate the effectiveness and superority of the improved scheme by Matlab simulation.

This paper discussed the theory of fuzzy control delta modulation in coding and encoding. And accomplish this algorithm in the DSP chip TMS320C5402,the result indicate that the algorithm used in DSP has a good effect in encoding and coding,almost accomplish diaphanously encode,and achieved the demand of design.

随着信息技术的发展和网络应用的普及,能够接受远程控制和服务的信息家电不断走入人门生活中.本文选用了ARM处理器S3C4510B为信息家电控制系统的主控芯片,系统各功能模块集成于uCLinux嵌入式操作操作系统中并在10M/100M以太网的环境下进行正常工作.文章探讨了在IP网络环境下信息家电控制系统的架构,包括系统组成、硬件配置、软件设计、工作原理等各方面.

讨论多功能车载导航电脑所必须提供的各种功能,由此设计出系统的基本结构,给出硬件结构框图和软件流程图.重点介绍收发短信的AT指令、GPRS模块拨号上网的AT指令、GPRS模块拨号上网的一般过程,对GIS服务中心的功能和实现做简单讨论,并给出车载电脑和GIS服务中心进行信息交换的数据格式.