欢迎来到麦多课文档分享! | 帮助中心 海量文档,免费浏览,给你所需,享你所想!
麦多课文档分享
全部分类
  • 标准规范>
  • 教学课件>
  • 考试资料>
  • 办公文档>
  • 学术论文>
  • 行业资料>
  • 易语言源码>
  • ImageVerifierCode 换一换
    首页 麦多课文档分享 > 资源分类 > PDF文档下载
    分享到微信 分享到微博 分享到QQ空间

    ITU-T F 761-1993 SERVICE-ORIENTED REQUIREMENTS FOR TELEWRITING APPLICATIONS《电写应用面向业务的要求》.pdf

    • 资源ID:795827       资源大小:45.45KB        全文页数:4页
    • 资源格式: PDF        下载积分:10000积分
    快捷下载 游客一键下载
    账号登录下载
    微信登录下载
    二维码
    微信扫一扫登录
    下载资源需要10000积分(如需开发票,请勿充值!)
    邮箱/手机:
    温馨提示:
    如需开发票,请勿充值!快捷下载时,用户名和密码都是您填写的邮箱或者手机号,方便查询和重复下载(系统自动生成)。
    如需开发票,请勿充值!如填写123,账号就是123,密码也是123。
    支付方式: 支付宝扫码支付    微信扫码支付   
    验证码:   换一换

    加入VIP,交流精品资源
     
    账号:
    密码:
    验证码:   换一换
      忘记密码?
        
    友情提示
    2、PDF文件下载后,可能会被浏览器默认打开,此种情况可以点击浏览器菜单,保存网页到桌面,就可以正常下载了。
    3、本站不支持迅雷下载,请使用电脑自带的IE浏览器,或者360浏览器、谷歌浏览器下载即可。
    4、本站资源下载后的文档和图纸-无水印,预览文档经过压缩,下载后原文更清晰。
    5、试题试卷类文档,如果标题没有明确说明有答案则都视为没有答案,请知晓。

    ITU-T F 761-1993 SERVICE-ORIENTED REQUIREMENTS FOR TELEWRITING APPLICATIONS《电写应用面向业务的要求》.pdf

    1、INTERNATIONAL TELECOMMUNICATION UNION)45G134 (b) that telewriting could serve as an optional facility to the general public telephone service, which could be ofinterest to several categories of users (e.g. deaf people, architects, advertising agencies, etc.);(c) that telewriting could support applic

    2、ations like educational communication services (“electronicblackboard”);(d) that telewriting could be a facility within a teleconference service;(e) that telewriting could add a graphic-oriented facility to telematic services,concludesthat telewriting can be applied as either a communication service

    3、 or a communication technique within otherservices,recommendsthat the service-oriented aspects of telewriting applications be in accordance with this Recommendation.1 General1.1 ScopeThis Recommendation specifies the service-oriented requirements for the application of telewriting incombination with

    4、 telephony.Use of telewriting as an independent telecommunication service or in combination with other services thantelephony is for further study.The technical characteristics of telewriting are specified in Recommendation T.150.1.2 DefinitionTelewriting enables the transmission of graphic informat

    5、ion to be displayed at the receiving side in accordancewith the writing movements at the sending side. This display is normally effected on a real time basis; a delay in thetransmission may be included.1.3 Applications1.3.1 Telewriting can support:a) explanatory information exchange;b) teleconferenc

    6、ing;c) distant teaching or lecturing;d) telecommunication between speech- and/or ear-handicapped people.1.3.2 Applications in combination with services other than the telephone service and/or non-real time applications arefor further study.2 Fascicle II.5 - Rec. F.7612 General characteristics of tel

    7、ewriting2.1 The main characteristics of telewriting in this context are real time display and interactive communication duringone session, which requires availability of a terminal at each side. Consequently, both sides of the connection will beable to contribute to the same image.2.2 The presentati

    8、on functionalities along with their attributes are described in Recommendation T.150. They allowmainly for: the generation, transfer and representation of curves of arbitrary shapes; the effect of the movement of thewriting instrument at the sending side is retained during reproduction; marking sing

    9、le positions in a telewriting image by means of a cursor; erasure of all or part of a telewriting image.2.3 The image input is provided by appropriate writing tools, such as a writing tablet and a writing pencil.2.4 At the originators terminal, the input information is made visible either by a displ

    10、ay unit or on the writing tabletitself.2.5 The reproduction at the recipients terminal will take place on a screen, on paper or on any other means, normallyresulting in a real time copy. The writing speed at the transmitting and receiving end should generally be the same.2.6 In principle, any type o

    11、f network can be used as a carrier for telewriting signals.3 Telewriting in combination with telephony3.1 The general characteristics are as mentioned in 2.1.3.2 The subset of presentation functionalities available are the default capabilities of the basic terminal as defined inRecommendation T.150.

    12、3.3 The following terminal operating modes are defined:a) speech plus telewriting: speech signals and telewriting signals can be sent simultaneously;b) telewriting only: in this mode sending of speech signals is blocked, reception of speech signals is stillpossible.3.4 The public switched telephone

    13、network is used for carrying the telewriting information. In practice, a 300 bpssub-channel derived from the available speech channel bandwidth is used.Note Use of the ISDN for carrying telewriting information is for further study.3.5 The quality of service depends on the characteristics of the tele

    14、phone network and of the telewriting equipment.In case of simultaneous transmission of speech and telewriting signals, mutual interference should be relativelysmall. Faults caused by speech interference on the telewriting band are not tolerable. The influence of the telewritingsignals on the quality of the speech conversation must be limited.


    注意事项

    本文(ITU-T F 761-1993 SERVICE-ORIENTED REQUIREMENTS FOR TELEWRITING APPLICATIONS《电写应用面向业务的要求》.pdf)为本站会员(twoload295)主动上传,麦多课文档分享仅提供信息存储空间,仅对用户上传内容的表现方式做保护处理,对上载内容本身不做任何修改或编辑。 若此文所含内容侵犯了您的版权或隐私,请立即通知麦多课文档分享(点击联系客服),我们立即给予删除!




    关于我们 - 网站声明 - 网站地图 - 资源地图 - 友情链接 - 网站客服 - 联系我们

    copyright@ 2008-2019 麦多课文库(www.mydoc123.com)网站版权所有
    备案/许可证编号:苏ICP备17064731号-1 

    收起
    展开