DVS stands for Descriptive Video Service. This free service describes to the visually impaired the actions, settings, body language, and graphics of television programs and movies on videotape.
All broadcast signals have two tracks for audio.
Track one gives you the primary sound for the program that you are watching. This narration does not interfere with the audio or dialogue of the program. Viewers will need a TV or VCR with the Secondary Audio Program. To find out if your TV or VCR is SAP equipped check your owner's manual. A SAP receiver is a device that can tune in a SAP channel.