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Some Dolby Standards


Dolby AC-3: "Audio CODEC 3," is a discrete, non-matrixed, 6- channel audio coding technology that is in the standard for ATSC DTV. Also used in DVD video and some DVD-ROM titles, Dolby Digital’s popular "5.1" designation results from the sixth, low frequency effects channel occupying only one tenth of the original bandwidth. Its low data rate results from 8:1 to 12:1 compression using hearing threshold limitations and frequency domain masking.

Dolby E: Is a higher bit rate, cascadable post-production and distribution process that claims to offer up to ten reproduction cycles without audible degradation. The "5.1 + 2" system allows up to eight channels of encoding/decoding plus SMPTE time code on either a single pair of AES/EBU channels or stereo digital tracks at 1.92 Mbits/sec.

Major Video Related Organizations, ATSC, Audio Engineering Society, DVB, FCC, IEEE, International Telecom Union, NAB, SMPTE, Video Services Forum