Definition - What does Dolby Digital mean?
Dolby Digital was formerly known as AC-3.
Techopedia explains Dolby Digital
Like the DTS technology, Dolby Digital also makes use of six channels:
- Left surround
- Right surround
- Low-frequency effects
Dolby Digital technology is based on the principle of how the human ear processes audio. By focusing on masking, eliminating and reducing the noise, Dolby Digital reduces the data required to produce high-quality audio, but maintains the essential amount of data to ensure good fidelity. It has also introduced surround formats such as Dolby Digital Plus, Dolby Digital EX, Dolby Digital Surround and others.
The benefits of Dolby Digital include easy access to software, comparatively larger software options, accurate transfer to disc from channel levels and great audio for music and movies. The code used in Dolby Digital is considered to be quite efficient and is thus capable of running at a lower bit rate.
One disadvantage of Dolby Digital is the degradation in the quality of the audio and video due to its higher compression level.
Dolby Digital is widely used in applications such as HDTV broadcast, digital cable, digital versatile discs, satellite transmission and game consoles. Discs supporting the Dolby Digital technology are usually marked with the Dolby logo.
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