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Caleb Bell
Caleb Bell

Cea 708 C: A Comprehensive Standard for Digital Television Closed Captioning



Cea 708 C Pdf Download: What You Need to Know




If you are looking for a way to create, display, or process digital television closed captions, you might have come across the term "Cea 708 C". But what is it exactly and why do you need to download it? In this article, we will explain what Cea 708 C is, how to download it, how to use it, and what are some examples of its applications. By the end of this article, you will have a better understanding of this standard and how it can help you with your closed captioning needs.




Cea 708 C Pdf Download


DOWNLOAD: https://www.google.com/url?q=https%3A%2F%2Ftinourl.com%2F2ucSrH&sa=D&sntz=1&usg=AOvVaw0D3JGEGyKnGYvmEWgtfWX3



What is Cea 708 C?




Cea 708 C is a standard developed by the Consumer Electronics Association (CEA) for digital television (DTV) closed captioning. It defines the syntax and semantics of the data that is transmitted along with the video and audio signals in DTV broadcasts. It also specifies how the data should be decoded and displayed by DTV receivers. Cea 708 C is an update of the previous versions of the standard, such as Cea 708 A, B, D, and E. It was published in June 2012 and approved by the American National Standards Institute (ANSI) as an official standard.


Cea 708 C has many features that make it superior to the older analog closed captioning system (Cea 608). Some of these features are:


  • It supports up to 63 services, each with its own language, format, and style.



  • It allows for multiple caption windows on the screen, each with its own position, size, color, background, border, opacity, etc.



  • It provides more control over the appearance and behavior of the captions, such as font, size, style, alignment, scrolling, animation, etc.



  • It supports special characters, symbols, accents, diacritics, etc. from various languages and scripts.



  • It can handle complex text layouts, such as bidirectional text (e.g., Arabic), vertical text (e.g., Chinese), or mixed text (e.g., English with Arabic).



  • It can display captions in different modes, such as pop-on, roll-up, paint-on, or text.



  • It can support additional features, such as 3D extensions, interactive captions, or metadata.



Why do you need to download Cea 708 C?




If you are involved in any aspect of DTV closed captioning, you might need to download Cea 708 C for several reasons. For example, you might need to:


  • Create captions that comply with the standard and can be displayed by DTV receivers.



  • Display captions that are transmitted by DTV broadcasters or content providers.



  • Process captions that are embedded in DTV signals or files.



  • Test or debug captions that are created, displayed, or processed by DTV devices or software.



  • Learn more about the standard and its features and capabilities.



By downloading Cea 708 C, you will have access to the official document that defines the standard and explains how it works. You will also be able to refer to it whenever you have any questions or doubts about the standard or its implementation.


How to download Cea 708 C?




The easiest way to download Cea 708 C is to visit the ANSI webstore and purchase the document online. Here are the steps to do so:


  • Go to https://webstore.ansi.org/ and search for "Cea 708 C" in the search box.



  • Select the document titled "CEA Standard Digital Television (DTV) Closed Captioning: 3D Extensions" and click on "Add to Cart".



  • Review your cart and click on "Proceed to Checkout".



  • Enter your billing and shipping information and click on "Continue".



  • Select your payment method and enter your payment details. You can pay by credit card, PayPal, or wire transfer.



  • Review your order and click on "Place Order".



  • You will receive an email confirmation with a link to download the document in PDF format.



The document costs $67 for non-members and $53.60 for members of CEA. You can also preview the document before purchasing it by clicking on the "Preview" button on the product page.


How to use Cea 708 C?




Once you have downloaded Cea 708 C, you can use it as a reference guide for creating, displaying, or processing DTV closed captions. The document is divided into several sections that cover different aspects of the standard. Here is a brief overview of the main sections and what they contain:


The service layer




This section describes the structure and function of the service layer, which is the highest level of abstraction in the standard. The service layer defines how the caption data is organized into services, each with its own language, format, and style. It also defines how the services are transmitted in service blocks, each with its own header that identifies the service number, size, and type. The service layer allows for up to 63 services per program, each with a maximum size of 128 bytes per video frame.


The caption channel layer




This section describes the structure and function of the caption channel layer, which is the next level of abstraction in the standard. The caption channel layer defines how each service is divided into one or more caption channels, each with its own priority, format, and style. It also defines how the caption channels are transmitted in packets, each with its own header that identifies the channel number, size, and type. The caption channel layer allows for up to eight caption channels per service, each with a maximum size of 128 bytes per video frame.


The caption service layer




This section describes the structure and function of the caption service layer, which is the lowest level of abstraction in the standard. The caption service layer defines how each caption channel is composed of one or more caption services, each with its own window, pen, and character layers. It also defines how the caption services are transmitted in commands, each with its own code that specifies what action should be performed by the receiver. The caption service layer allows for up to six caption services per channel, each with a maximum size of 128 bytes per video frame.


The window layer




The window layer




This section describes the structure and function of the window layer, which is a sublayer of the caption service layer. The window layer defines how each caption service can create one or more windows on the screen, each with its own position, size, color, background, border, opacity, etc. It also defines how the windows are transmitted in commands that specify how to create, modify, delete, or display them. The window layer allows for up to eight windows per service, each with a maximum size of 210 columns by 75 rows.


The pen layer




This section describes the structure and function of the pen layer, which is a sublayer of the caption service layer. The pen layer defines how each caption service can control the appearance and behavior of the text that is displayed in the windows, such as font, size, style, alignment, scrolling, animation, etc. It also defines how the pens are transmitted in commands that specify how to set or modify their attributes. The pen layer allows for up to 32 pens per service, each with a maximum size of 4 columns by 2 rows.


The character layer




This section describes the structure and function of the character layer, which is a sublayer of the caption service layer. The character layer defines how each caption service can display text characters in different languages and scripts using various code sets and character sets. It also defines how the characters are transmitted in commands that specify their codes and sets. The character layer allows for up to 65536 characters per service, each with a maximum size of 1 column by 1 row.


What are some examples of Cea 708 C applications?




Cea 708 C is a versatile and powerful standard that can be used for various applications and scenarios involving DTV closed captioning. Here are some examples of how Cea 708 C can be applied:


3D extensions




Cea 708 C can support stereoscopic 3D TV captioning by using a special command called SetDepth. This command allows the caption service to specify the depth of each window relative to the screen plane. This way, the captions can appear closer or farther away from the viewer depending on the depth of the 3D scene. This feature can enhance the viewing experience and avoid visual discomfort caused by conflicting depth cues. Cea 708 C defines the syntax and semantics of the SetDepth command in a separate document called Cea 708.1 .


CCExtractor




CCExtractor is a free and open-source software that can decode and output Cea 708 C captions from various video or caption file formats. It can also convert captions between different formats and standards. CCExtractor can be used as a command-line tool or as a library that can be integrated into other applications. CCExtractor supports Cea 708 C in MPEG-2 and MPEG-4 (.mpg, .ts, and .mp4 containers), MCC (MacCaption Closed Captions), and SCC (Scenarist Closed Captions) files .


Conclusion




In this article, we have explained what Cea 708 C is, how to download it, how to use it, and what are some examples of its applications. We have shown that Cea 708 C is a standard that defines how to create, display, and process digital television closed captions with many features and capabilities. We have also shown that Cea 708 C can be downloaded from the ANSI webstore and used as a reference guide for DTV closed captioning needs. We hope that this article has helped you understand Cea 708 C better and encouraged you to use it for your own projects.


If you have any questions or comments about this article or Cea 708 C in general, please feel free to contact us or leave a comment below. We would love to hear from you and help you with your DTV closed captioning needs.


FAQs




  • What is the difference between Cea 608 and Cea 708?Cea 608 is an older standard for analog closed captioning that was used before the transition to digital television. It has limited features and capabilities compared to Cea 708. Cea 708 is a newer standard for digital closed captioning that has many features and capabilities that allow for more control and customization of the captions.



  • How can I tell if a video file has Cea 708 captions?One way to tell if a video file has Cea 708 captions is to use a tool like MediaInfo or CCExtractor that can analyze the file and display its metadata and caption information. Another way is to look for the presence of the Cc_data() function in the video elementary stream, which indicates that Cea 708 caption data is present.



  • How can I create Cea 708 captions?There are different ways to create Cea 708 captions, depending on your needs and preferences. You can use a professional captioning software or service that supports Cea 708, such as MacCaption, CaptionMaker, or Rev.com. You can also use a free and open-source software like CCExtractor that can convert captions from other formats or standards to Cea 708. You can also create Cea 708 captions manually by following the syntax and semantics of the standard as defined in the document.



  • How can I display Cea 708 captions?To display Cea 708 captions, you need a device or software that can decode and render them properly. Most modern DTV receivers and players have built-in support for Cea 708 captions and allow you to select the service and channel you want to display. You can also use a free and open-source software like CCExtractor that can output Cea 708 captions in various formats, such as SRT, WebVTT, or SAMI.



  • How can I process Cea 708 captions?To process Cea 708 captions, you need a device or software that can extract and manipulate them according to your needs. You can use a professional captioning software or service that supports Cea 708, such as MacCaption, CaptionMaker, or Rev.com. You can also use a free and open-source software like CCExtractor that can process Cea 708 captions in various ways, such as converting, filtering, synchronizing, or validating them.



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