The Descriptive Video Service (DVS), created by WGBH-TV in Boston ^{[citation needed]}, is used by the Public Broadcasting Service (PBS) in the U.S. to provide video description for the visually impaired, so they can better understand what is happening on the video portion of the program. This greatly improves the experience and makes it much more valuable to blind and visually impaired viewers. WGBH is an established public television and public radio broadcast service located in Boston, Massachusetts. ... Boston is a town and small port c. ... The Public Broadcasting Service (PBS) is a non-profit public broadcasting television service with 349 member TV stations in the United States. ... Motto: (1789 to 1956) (Latin for Out of many, one) In God We Trust (1956 to present) Anthem: The Star-Spangled Banner Capital Washington, D.C. Largest city New York City Official language(s) None at federal level; English (de facto) Government Federal Republic  - President George W. Bush (R)  - Vice... Audio description refers to an additional narration track for blind and visually impaired viewers of visual media, including television and movies, dance, opera, and visual art. ... Blindness can be defined physiologically as the condition of lacking sight. ... This article or section does not cite its references or sources. ... Blindness can be defined physiologically as the condition of lacking sight. ...

An example might be on a program about Old Faithful in Yellowstone National Park. As the geyser starts, the DVS announcer would describe the scene: Old Faithful can refer to: Old Faithful Geyser Old Faithful Quasar This is a disambiguation page — a navigational aid which lists other pages that might otherwise share the same title. ... For the next-generation airliner series from Boeing, see Boeing Yellowstone Project. ... Clepsydra Geyser in Yellowstone A geyser is a type of hot spring that erupts periodically, ejecting a column of hot water and steam into the air. ...

"Boiling water bubbles up from the hole in the middle of the flat ground, and quickly begins shooting into the beautiful cobalt blue sky above it. The 100-foot tall stream sprays water and steam downwind, until it begins to gradually subside and retreat back into the earth."

While this may be obvious to those who can see the screen, these details must be described to those with vision impairments, which is the purpose of DVS. The DVS announcer is usually the opposite gender of the main announcer, to eliminate potential confusion between the two.

DVS is accessible on any TV with multichannel television sound (MTS) on the second audio program (SAP) setting. When DVS programming is not being transmitted, the local National Public Radio station (or state NPR network) is often heard instead. Idiot box redirects here. ... Multichannel television sound, better known as MTS (often still as BTSC, for the Broadcast Television Systems Committee that created it), is the method of encoding three additional channels of audio into an NTSC-format audio carrier. ... Second[ary] audio program[ming] (SAP) is an auxiliary audio channel for television that can be broadcast or transmitted both over the air and by cable TV. It is often used for an alternate language (hence giving the facetious Spanish audio program expansion to the acronym), or for the Descriptive... NPR logo NPR redirects here. ...

DVS audio tracks are also beginning to appear in DVD movies, and some commercial television programming (such as The Simpsons) also uses DVS. DVD-R writing/reading side DVD (also known as Digital Versatile Disc or Digital Video Disc) is an optical disc storage media format that can be used for data storage, including movies with high video and sound quality. ... The Simpsons is an American animated sitcom created by Matt Groening. ...