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当前,常见的多声道环绕声技术有五种:Dolby Digital(AC-3)、DTS、SDDS、4声道的Dolby Surround ProLogic (Dolby定向逻辑),以及CS-5.1。这五种技术中,前四种互不兼容。在消费类产品中广为应用的5.1声道Dolby Digital技术用数字方法编码、解码,经过压缩后把6个独立声道的声音都放在一个数字信号流当中,压缩比为13:1,播放时解码成为原来的6个声道。自1992年推出第一部采用Dolby Digital技术的电影,1995年推出第一张Dolby Digital激光
Currently, there are five common multichannel surround sound technologies: Dolby Digital (AC-3), DTS, SDDS, 4-channel Dolby Surround ProLogic, and CS-5.1. Among the five technologies, the first four are not compatible with each other. The 5.1-channel Dolby Digital technology, which is widely used in consumer products, is digitally encoded and decoded. The compressed, compressed, 6-channel sound is placed in a stream of digital signals at a 13: 1 compression ratio. When decoding the original 6 channels. Launched the first film to feature Dolby Digital technology in 1992 and the first Dolby Digital laser in 1995