The most familiar ones are part of the Dolby Digital family.
Below we discuss three: Dolby Digital, Dolby Digital EX, and Dolby Digital Plus.
What Is Dolby Digital?
Almost all home theater receivers have a built-in Dolby Digital decoder.
Dolby Digital is often referred to as a5.1 channelsurround system.
Dolby Digital may also be referred to asDD, DD 5.1, or AC3.
The Dolby Digital EX format is similar to Dolby Digital.
This means there are both front and rear center channels.
The extra EX information is sorted and distributed (or mixed) within a 5.1 channel sound field.
This creates a phantom rear center backchannel without the presence of a physical rear center speaker.
However, you still hear the sound that was originally encoded for the center backchannel.
What Is Dolby Digital Plus?
Dolby Digital Plus also includes a standard Dolby Digital 5.1 bitstream that’s compatible with standard Dolby Digital-equipped receivers.
The surround back left and right channels are folded into the left and right surround channels.
Dolby Digital Plus is one of the several audio formats used in the Blu-ray Disc format.
It’s compatible with the audio portion of theHDMIinterface and is used in streaming and mobile audio applications.
Dolby Digital Plus is built into theDolby Audio platform for Windows 10 and the Microsoft Edge internet tool.
