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

    ANSI SMPTE ST 262M-1995 Television Audio and Film - Binary Groups of Time and Control Codes - Storage and Transmission of Data.pdf

    • 资源ID:437966       资源大小:1.56MB        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。

    ANSI SMPTE ST 262M-1995 Television Audio and Film - Binary Groups of Time and Control Codes - Storage and Transmission of Data.pdf

    1、1 ScopeThis standard specifies a directory index to classifyvarious types of data to be recorded into the binarygroups (user bits) of the SMPTE time and controlcode. The directory index, located in two binarygroups of the time and control code frame, fully speci-fies the type of data stored in the r

    2、emaining binarygroups of that frame.This standard also specifies the group assignmentsof timing, application, and control data types to sub-sets of the directory index. It applies to both linear andvertical interval time code applications. Specificationsof application dialects will be developed in r

    3、elateddocuments.2 Normative referencesThe following documents contain provisions which,through reference in this text, constitute provisions ofthis standard. At the time of publication, the editionsindicated were valid. All standards are subject torevision, and parties to agreements based on thissta

    4、ndard are encouraged to investigate the possibilityof applying the most recent edition of the documentsindicated below.ANSI/SMPTE 12M-1995, Television, Audio and Film- Time and Control Code SMPTE RP 169-1995, Television, Audio and FilmTime and Control Code - Auxiliary Time AddressData in Binary Grou

    5、ps - Dialect Specification ofDirectory Index LocationsISO/IEC 646:1991, Information Technology - ISO7-Bit Coded Character Set for Information Inter-changeISO/IEC 2022:1994, Information Technology -Character Code Structure and Extension Tech-niques3 Data structure3.1 Frame format (see figure 1)3.1.1

    6、Binary group labelsThe binary group containing the lowest frame addressbit numbers is referred to as binary group 1 (BG 1),and the binary group containing the highest bit num-bers is referred to as binary group 8 (BG 8). Within abinary group, the lowest bit number contains the leastsignificant bit o

    7、f data.3.1.2 Binary byte labelsThe data content of the binary groups may be specifiedas 8-bit character sets, in which case the charactersshould be inserted in accordance with ANSI/SMPTE12M. Thus, binary groups 1 and 2 form binary byte 1,binary groups 3 and 4 form binary byte 2, binarygroups 5 and 6

    8、 form binary byte 3, and binary groups7 and 8 form binary byte 4. Within a binary byte, thelower numbered binary group contains the four leastsignificant bits of data.3.1.3 Directory indexBinary groups 7 and 8 shall be used as a directoryindex for page-line user bit applications. Binary group8 shall

    9、 specify a directory page totalling 16 pages, andbinary group 7 shall specify a directory line totalling16 lines per page.for Television, Audio and Film -Binary Groups of Timeand Control Codes -Storage and Transmission of DataCAUTION NOTICE: This Standard may be revised or withdrawn at any time. The

    10、 procedures of the Standard Developer require that action be taken to reaffirm, revise,or withdraw this standard no later than five years from the date of publication. Purchasers of standards may receive current information on all standards by calling orwriting the Standard Developer. Printed in USA

    11、.ANSI/SMPTE 262M-1995SMPTE STANDARDPage 1 of 5 pagesApprovedSeptember 12, 1995Copyright 1995 by THE SOCIETY OF MOTION PICTURE AND TELEVISION ENGINEERS595 W. Hartsdale Ave., White Plains, NY 10607(914) 761-1100Figure 1 - Frame format (vertical interval and linear track)ANSI/SMPTE 262M-1995Page 2 of 5

    12、 pages3.2 Directory index format (see figure 2)3.2.1 Time or media address dataAll address data contained on pages 0, 1, and 2 relateto program timing and should be processed accord-ingly. Two types of address dialects can be stored inthese pages: auxiliary time address and mediaaddress.Auxiliary ti

    13、me address data can be stored at directoryindex lines 0 through 9 of pages 0 and 1, and lines 0through 3 of page 2, which correspond to auxiliarytime address hours 00 through 23. This dialect, asspecified in SMPTE RP 169, provides a second timeaddress with the same order and format as theprimary tim

    14、e address data.Media address data other than time address can bestored in directory index lines 10 through 15 of pages0 and 1 and lines 4 through 15 of page 2. 3.2.2 Control dataOne page (page 15) containing 16 lines is assignedto control data which consists of instructions requiringreal-time comman

    15、d and execution. A frame carryingcontrol data shall include an 8-bit checksum and havehighest priority for encoding (see 3.4.5).3.2.3 Applications dataTwelve pages, for a total of 192 lines, are reservedfor user application subsets. A particular applicationdialect may specify a group of page-line su

    16、bsets.3.3 Use of binary groups3.3.1 Binary group flag bitsWhen the data structure conforms to this format, thebinary group flag bits shall be set in accordance withANSI/SMPTE 12M for page-line applications.Figure 2 - Page-line directory24- and 30-fps systems 25-fps systemsBinary group flag Bit value

    17、 LTC bit VITC bit LTC bit VITC bitBGF2 1 59 75 43 55BGF1 0 58 74 58 74BGF0 1 43 55 27 35Table 1 - Binary group flag values for page-line encodingANSI/SMPTE 262M-1995Page 3 of 5 pages3.3.2 Subset applicationsEach frame of time and control code may contain onlyone type of data, identified by the value

    18、 of the directoryindex. The choice of data types and their repetitionfrequency is left to the discretion of the user.3.3.3 Error detectionError detection may be provided for as an 8-bit check-sum. This consists of the twos complement of the leastsignificant byte (modulo 256) of the sum of the speci-

    19、fied binary bytes.3.4 Message formats3.4.1 Control codes (see figure 3)This format consists of 2-byte instructions conveyingreal-time commands in binary bytes 2 and 3. Binarybyte 1 carries an 8-bit checksum of binary bytes 2, 3,and 4.3.4.2 Single-frame messages (see figure 3)This format consists of

    20、a 3-byte message transmittedwithin binary bytes 1, 2, and 3. Certain applicationsdialects may specify binary byte 1 as an 8-bit check-sum of binary bytes 2, 3, and 4.3.4.3 Message strings (see figure 4)A string of formatted data can be encoded as amessage string comprising three types of frames:pref

    21、ix frame(s), message frame(s), and suffixframe(s), each of which is assigned a unique directoryindex. The maximum message length shall beconstrained to 256 frames.The prefix and suffix frames shall be structured asfollows: Binary byte 1 carries an 8-bit checksum ofbinary bytes 2, 3, and 4. Binary by

    22、tes 2 and 3 providemessage specifier information, such as message ID,destination address, and message length. Multipleprefix and suffix frames may be specified for a mes-sage string, as required by the application dialect.Each prefix and suffix frame shall be identified as suchby a unique directory

    23、index allocation.The message frame shall be structured as follows:Each message frame carries message data in binarybytes 1, 2, and 3, while binary byte 4 carries thedirectory index, indicating a message frame.When transmitting a message conforming to ISO/IEC646 and ISO/IEC 2022, unused bytes of the

    24、messageframe preceding the first suffix frame shall be nullfilled. Use of the parity bit provided with this data typeallows error detection on the message data.Figure 3 - Control code and single-frame message formatsANSI/SMPTE 262M-1995Page 4 of 5 pages3.4.4 Extended message strings (see figure 4)A

    25、string of unformatted data conforming to ISO/IEC646 and ISO/IEC 2022 can be combined with themessage prefix and suffix frames, as defined in 3.4.3,to provide an extended message string format. Thedata type carried in the extended message frames issignalled by the binary group flag bits, in accordanc

    26、ewith ANSI/SMPTE 12M.3.4.5 Message encoding priorityIn the absence of other applications guidelines, andin the event that multiple sources of directory indexdata request encoding to the binary groups ofthe same time address location, the higher pagenumbered directory index application shall takeprio

    27、rity. Similarly, priority shall be given to higher linenumbered applications for time-coincident directoryindex data of the same page number. Applicationsdialects should specify source priority coding forsituations where time-coincident data of the samepage and line number may occur.Figure 4 - Message and extended message formatsANSI/SMPTE 262M-1995Page 5 of 5 pages


    注意事项

    本文(ANSI SMPTE ST 262M-1995 Television Audio and Film - Binary Groups of Time and Control Codes - Storage and Transmission of Data.pdf)为本站会员(tireattitude366)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