Browse Definitions :
Definition

closed captions

What are closed captions?

Closed captions are a text version of the spoken part of a television, movie or computer presentation.

Closed captioning was developed to aid deaf and hard-of-hearing people, but it's useful for a variety of situations. For example, captions can be read when audio can't be heard, either because of a noisy environment, such as an airport, or because of an environment that must be kept quiet, such as a hospital.

The history behind closed captions

According to the Television Decoder Circuitry Act of 1990, all televisions made in the United States since 1993 must have a built-in caption decoder if their picture tubes are larger than 13 inches.

In July 2000, the Federal Communications Commission (FCC) mandated sections of industry-standard EIA-708-B, "digital closed captioning implementation" into its broadcast regulations.

The new rules made it possible for users to select the size, color and font of their captions and to select among multiple streams -- choosing, for example, a particular language to view the closed captions.

Additionally, closed captions are required by the Americans with Disabilities Act for "public entities," including state and local governments, for any video communications whether they be internal or external and for "places of public accommodations," which can be private or public businesses used by the public.

How does closed captioning work?

Closed captions are added to the video signal, in line 21 of the vertical blanking interval, through a process of encoding.

The text only becomes visible with the use of a decoder, which may be built into a television set or available as a set-top box. In general, an onscreen menu on newer televisions enables you to turn closed captioning on or off.

Most programs are captioned in advance of transmission, but the nature of some programs, such as live news broadcasts, requires real-time captioning.

For live captioning, a stenographer or captioning service listens to the broadcast and types a shorthand version into a program that converts the shorthand into a transcription of the captions and adds that data to the television signal.

example of closed captioning
Example of closed captioning turned on for video

What are the closed captioning requirements?

The FCC requires that all English and Spanish language video programming that aired on television with captions must also be captioned when uploaded for distribution online.

Additionally, the video programming must be captioned if it is "substantially similar" to the program that aired on TV.

This includes live and near-live programming, user-generated content that is similar to professionally produced content, and archival or library content.

The 21st Century Communications and Video Accessibility Act also requires that any newly created or edited video programming must be captioned if it is "substantially similar" to the program that aired on TV.

All prerecorded video programming that is shown on television with captions must be captioned when offered online unless an exception applies.

Closed captions vs. open captions

Unlike closed captions, open captions are embedded directly into the video and cannot be turned off. Open captions are generally used only when absolutely necessary, as they limit viewer choice.

An example of when open captions might be used is in a movie theater, where deaf and hard-of-hearing viewers would otherwise miss all the dialogue.

Some movies are released with both closed and open captions, enabling viewers to choose which type of captioning they prefer.

turning closed captioning on
Selecting the CC icon turns closed captioning on.

Closed captions vs. subtitles

Closed captions and subtitles are similar but have some key differences.

Both closed captions and subtitles are text versions of spoken words and other nonspeech elements that appear in the video stream, but closed captions are intended for viewers who are deaf and hard of hearing. However, they can also be used when background noise makes it too difficult to properly hear the audio from the video content.

Those who use subtitles, on the other hand, typically do so because they don't understand the language being spoken in the movie or TV show -- for example, in a foreign language film where the original language spoken in the film is Mandarin but is translated into English for the subtitles.

Another key difference is that closed captions can include nonverbal information, such as sound effects, while subtitles generally don't include this type of information.

Finally, closed captions can be turned on or off, while subtitles typically cannot.

See also: digital accessibility, speech recognition and natural language processing.

This was last updated in July 2022

Continue Reading About closed captions

SearchNetworking
  • cloud-native network function (CNF)

    A cloud-native network function (CNF) is a service that performs network duties in software, as opposed to purpose-built hardware.

  • microsegmentation

    Microsegmentation is a security technique that splits a network into definable zones and uses policies to dictate how data and ...

  • Wi-Fi 6E

    Wi-Fi 6E is one variant of the 802.11ax standard.

SearchSecurity
  • MICR (magnetic ink character recognition)

    MICR (magnetic ink character recognition) is a technology invented in the 1950s that's used to verify the legitimacy or ...

  • What is cybersecurity?

    Cybersecurity is the protection of internet-connected systems such as hardware, software and data from cyberthreats.

  • Android System WebView

    Android System WebView is a system component for the Android operating system (OS) that allows Android apps to display web ...

SearchCIO
  • privacy compliance

    Privacy compliance is a company's accordance with established personal information protection guidelines, specifications or ...

  • contingent workforce

    A contingent workforce is a labor pool whose members are hired by an organization on an on-demand basis.

  • product development (new product development -- NPD)

    Product development, also called new product management, is a series of steps that includes the conceptualization, design, ...

SearchHRSoftware
  • talent acquisition

    Talent acquisition is the strategic process employers use to analyze their long-term talent needs in the context of business ...

  • employee retention

    Employee retention is the organizational goal of keeping productive and talented workers and reducing turnover by fostering a ...

  • hybrid work model

    A hybrid work model is a workforce structure that includes employees who work remotely and those who work on site, in a company's...

SearchCustomerExperience
  • Salesforce Trailhead

    Salesforce Trailhead is a series of online tutorials that coach beginner and intermediate developers who need to learn how to ...

  • Salesforce

    Salesforce, Inc. is a cloud computing and social enterprise software-as-a-service (SaaS) provider based in San Francisco.

  • data clean room

    A data clean room is a technology service that helps content platforms keep first person user data private when interacting with ...

Close