ITU-T G.729Annex A语音压缩编码算法的浅述

G.729是CCITT推荐的语音压缩编码的标准中算法最为复杂的一种,AnnexA减少了其计算的复杂度.     

Telephone Calls Received at an Academic Library's Reference Desk: A New Analysis

ABSTRACT

It has been established that much of the assistance provided to library patrons at reference desks does not require the knowledge and expertise of a professional librarian. Is the same thing true of the telephone calls received at reference desks in academic libraries? This article reports the results of one academic librarian's reference desk transaction log analysis which focuses on the categories of assistance provided to patrons who called the library's reference desk.     

The Columbia Shuttle Breakup: News Diffusion Comparison of a Local and Distant Location

This study examines the news diffusion process during the 2003 Columbia shuttle tragedy. Participants in two locations were surveyed during the week following the tragedy to directly compare the diffusion process for a distant and local location. An initial difference was the prevalence of telephone use for the local group in first hearing about the breakup versus face-to-face and television for the distant group. Internet usage appeared more prevalent than in previous studies and was particularly evident for the distant group during the initial stages of the news event. Television was the primary choice for follow-up information for both groups. While mass media usage seemed comparable throughout, the use of interpersonal sources declined more for the distant group during the diffusion process.     

数字电视--图书馆服务拓展新平台

论文在介绍数字电视相关知识的基础上，提出将数字电视作为延伸图书馆服务的新平台。论文还就电话、互联网、数字电视对图书馆服务的影响进行了比较分析。     

移动电话拥有量的预测模型

利用Logstic模型,给出了本溪地区移动电话拥有量的预测模型,并对未来本溪地区的移动电话需求量作出了预测。     

开展电话咨询服务刍议

我国图书馆开展电话咨询服务的主客观条件已经具备，本文提出了几种运作方式，并就咨询内容、相关配置等提出了建议。     

简易太阳能手机充电器的设计

设计了一款简易太阳能手机充电器,对充电电路的稳压模块、充电保护模块、充电控制模块等进行电路的分析与研究,阐述了电路的工作原理,实际测试表明,该充电器工作稳定、可靠,使用灵活。     

GSM手机的维修方法和技巧

本文详细介绍了在维修GSM手机时采用的一些方法和技巧,介绍了手机最基本的几项电气指标和要求。