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MP3' Tech - Dolby AC-3 |
 | | The goal of this digital compression technology is to produce a digital representation of an audio signal which, when decoded and reproduced, sounds the same as the original signal, while using a minimum of digital information (bit-rate) for the compressed (or encoded) representation, providing true surround sound. |
 | | It provides five full range channels (3 Hz to 20,000 Hz) in what is sometimes referred to as a "3/2" configuration: three front channels (left, center, and right), plus two surround channels. |
 | | A sixth bass-only effects channel (3 Hz to 120 Hz), also called sometimes "low frequencies enhancement channel" (LFE), is also provided, giving rise to the term "5.1" channels. |
| www.mp3-tech.org /ac3.html (632 words) |
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