The Cinema Version of 'Dolby Digital EX' is called Dolby Digital Surround Ex and works the same way. EX adds an extension to the standard 5.1 channel Dolby Digital codec in the form of matrixed rear channels, creating 6.1 or 7.1 channel output. However, Adaptive Transform Acoustic Coding 3, or ATRAC3, is a separate format developed by Sony) ĭolby Digital EX is similar in practice to Dolby's earlier Pro-Logic format, which utilized matrix technology to add a center channel and single rear surround channel to stereo soundtracks. AC-3 (Audio Codec 3, Advanced Codec 3, Acoustic Coder 3.DD (an abbreviation for Dolby Digital, often combined with channel count for instance, DD 2.0, DD 5.1).This codec has several aliases, which are different names for the same codec: The Laserdisc version of Clear and Present Danger featured the first Home theater Dolby Digital mix in 1995. Batman Returns was the first film to use Dolby Digital technology when it premiered in theaters in Summer 1992. AC-3 supports audio sample-rates up to 48 kHz. Mono and stereo modes are also supported.

The most elaborate mode in common usage involves five channels for normal-range speakers (20 Hz – 20,000 Hz) (right front, center, left front, right rear and left rear) and one channel (20 Hz – 120 Hz allotted audio) for the subwoofer driven low-frequency effects. Dolby Digital is the common version containing up to six discrete channels of sound.

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