Dolby® Digital, also referred to as AC-3, is an audio encoding/decoding technology that delivers up to 5.1 discrete channels of surround sound.
Provides compatibility with millions of existing playback units
Delivers mono to 5.1 audio
Employs Dolby metadata that can be easily transcoded into Dolby Digital Plus
How It Works
Applied to the final broadcast transmission signal just prior to multiplexing with the digital video, Dolby Digital is used extensively in digital satellite (DBS and DVB), cable, and terrestrial high-definition TV (ATSC).
Dolby Digital’s adaptability is the result of metadata that is created during programming production and carried in the Dolby Digital bitstream.
Metadata parameters ensure that the program producer’s original vision for the audio is faithfully delivered within a single audio bitstream. This provides audiences with a high-quality audio experience, whether they are listening to a mono, stereo, or 5.1-channel system.
Since its inception, Dolby Digital has been refined and enhanced in the form of the Dolby Digital Plus codec. Dolby Digital Plus provides all of the core functionality of Dolby Digital while adding new features that are critical to today’s content delivery mediums such as HDTV and online streaming, as well as devices such as tablets and smartphones.
All Dolby Digital Plus decoders can decode the Dolby Digital format.