What is AC3?
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Loading ...AC3 or Audio Codec 3 is a Dolby Digital audio file that can be found as the standard audio track on Digital Versatile Discs (DVD) and High Definition Television (HDTV). Dolby Digital is the trademarked marketing name for Dolby Laboratories’ ‘lossy’ AC-3 codec. The common version contains 5.1 channels (five primary speakers and an LFE channel), but the format supports Mono and Stereo usages as well.
The AC3 audio coder has been designed to take maximum advantage of human auditory masking in that it divides the audio spectrum of each channel into narrow frequency bands of different sizes optimized with respect to the frequency selectivity of human hearing. This makes it possible to sharply filter coding noise so that it is forced to stay very close in frequency to the frequency components of the audio signal being coded. By reducing or eliminating coding noise wherever there are no audio signals to mask it, the sound quality of the original signal can be subjectively preserved.
The AC3 standard is being replaced with AAC (Advanced Audio Coding), although AC3 will continue to live on for many decades due to the number of systems and networks which currently utilize it.
Tags: ac3, audio codec, dolby digitalRelated posts
Tags: ac3, audio codec, dolby digital
December 8th, 2008 at 8:30 pm
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