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 N 13-1988 MEASUREMENTS TO BE MADE BY THE BROADCASTING ORGANIZATIONS DURING THE PREPARATORY PERIOD《测量仍需由广播组织在筹备期-维护国际声音节目和电视传输电第4研究组 共3页》.pdf

    • 资源ID:800278       资源大小:73.22KB        全文页数:5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 N 13-1988 MEASUREMENTS TO BE MADE BY THE BROADCASTING ORGANIZATIONS DURING THE PREPARATORY PERIOD《测量仍需由广播组织在筹备期-维护国际声音节目和电视传输电第4研究组 共3页》.pdf

    1、INTERNATIONAL TELECOMMUNICATION UNION)45G134 . TELECOMMUNICATIONSTANDARDIZATION SECTOROF ITU-!).4%.!.#%G0G0/ location; country.The sound programme signal should be controlled by the sending broadcaster so that the amplitudes of thepeaks only rarely exceed the peak amplitude of the permitted maximum

    2、(sine-wave test) signal._1)Based on CCIR Recommendation 661 2.2 Fascicle IV.3 Rec. N.13A.1.2 Test signal and level definitionsA.1.2.1 alignment signal (AS)Sine-wave signal at 1020 Hz at a level of 0 dBm0s, which is used to align the international sound-programmeconnection.A.1.2.2 measurement signal

    3、(MS)Sine-wave signal at 1020 Hz at a level 12 dB below the alignment signal level, which should be used for long-term measurements and measurements at all frequencies.A.1.2.3 permitted maximum signal (PMS)Sine-wave signal at 1020 Hz, 9 dB above the alignment signal level, equivalent to the permitted

    4、 maximumprogramme-signal level.A.2 Test signal formatA.2.1 A three-level sinusoidal test signal at a reference frequency of 1 kHz should be used to check the alignment ofinternational sound programme connection. These three levels should be combined with the source identification and berepeated cycl

    5、ically as specified in the format shown in Figure A-1/N.13 for monophonic and stereophonic connections.FIGURE 1/N.13.D01d01-scFascicle IV.3 Rec. N.13 3A.2.2 Provisionally, the portion of the test signal designated at +9 dBm0s in Figure A-1/N.13 will be replaced by asignal at 0 dBm0s. The resulting t

    6、wo-level test signal is required until all transmission systems are capable of carryingsinusoidal signals at +9 dBm0s without producing excessive channel loading or crosstalk into other channels.A.2.3 Some organizations may not have automatically generated test levels as defined in A.2.1 and A.2.2.

    7、In thesecases, the alignment level of 0 dBm0s at 1020 Hz should be used for the alignment of international sound programmeconnections.A.3 Measurement methodsThe fundamental concept of the test signals is to provide organizations with accurate and well defined levels.These levels are intended to prov

    8、ide rapid identification of level errors as well as to allow operational personnelsufficient time to make the necessary level adjustments at the appropriate points in the international sound programmeconnection. Alignment of the connection is made by adjusting the alignment signal to the appropriate

    9、 point on theprogramme level meter. Identification of left and right channels is provided as shown in Figure A-1/N.13.References1 CCITT Recommendation Automatic equipment for rapidly measuring stereophonic pairs and monophonicsound-programme circuits, links and connections, Vol. IV, Rec. O.33.2 CCIR Recommendation Signals for the alignment of international sound-programme connections, Vol. XII,Rec. 661, ITU, Geneva, 1986.


    注意事项

    本文(ITU-T N 13-1988 MEASUREMENTS TO BE MADE BY THE BROADCASTING ORGANIZATIONS DURING THE PREPARATORY PERIOD《测量仍需由广播组织在筹备期-维护国际声音节目和电视传输电第4研究组 共3页》.pdf)为本站会员(amazingpat195)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