Yes. Closed captioning allows the viewer to choose whether or not to display captions that are transmitted in encoded form through the use of a decoder. Most often, this type of captioning is used in broadcast television, where a decoder is built into the television set and can be turned on to display encoded messaging on screen. The process of encoding the message involves storing the caption data within the video signal, and Alderson has the capability to do so.
Captioning has broader applications than just television which might require captioning without encoding (open captions) so that it can display without the need for a decoder. A few examples of this type of captioning service would include webcasts or live events being captioned on a Jumbotron or large LCD monitors.
With roll-up captioning, entire lines of text roll in a continuous, upward motion. Most often, only two to three lines of text will appear at a time, with each new line bumping the text upward to replace the top line. This type of captioning is not synchronized to the video, and is most suited to live events or pre-recorded presentations with a limited number of speakers.
Pop-on captioning allows a deeper dimension of synchronization to the video, which can be particularly helpful to the hard of hearing. With pop-on captioning, the phrases or sentences spoken by each person are timed, and often positioned, to synchronize with the program and help identify the speaker.