DVD-Audio is a digital format designed for delivering high-fidelity audio content on a DVD. It is also known as DVD-A, and isn’t intended to be a video delivery format. The format varies from video DVDs containing concert films or music videos. It offers many possible configurations of audio channels that range from single-channel mono to 5.1-channel surround sound, at different sampling frequencies and sample rates.
DVD-Audio disc can store audio in many different bit depth/sampling rate/channel combinations on a single disc. For example, a DVD-Audio disc may contain a 96 kHz/24-bit 5.1-channel audio track and a 192 kHz/24-bit stereo audio track at the same time. The channels of a track can even be split into two groups that are stored at different resolutions.
The audio stored on the disc is either uncompressed or losslessly compressed with Meridian Lossless Packing. The format is a member of the DVD family and this enables a single disc to have multiple layers and two sides that contain audio and video material. Encrypted digital formats are now approved by the DVD Forum and the High Definition Multimedia Interface allows the encrypted digital audio to be carried up to DVD-Audio specification. This helps in sending the six channels of audio information to the amplifier.
The audio resolution of a DVD-Audio disc can be higher than red book CD audio. Content Protection for Prerecorded Media is a copy protection mechanism that is optionally employed by DVD-Audio discs. The mechanism is designed to prevent users from extracting audio to computers and portable media players. Macintosh, Windows and Linux are the DVD-Audio authoring softwares.