Today, with the fast development of science and technology, the endless emerged familial cinema system and full of beautiful DVD dishes enriches people¨s life, and entered into more and more common homes, now we will introduce several kinds of familial cinema systems, which are concerned by everybody at present. 　　　＃What is DOLBY Digital? 　　　　Dolby digital is the production of Pioneer Corp. combined with Dolby Corp. Dolby Digital is also called AC-3, it¨s a Dolby stereophonic and ambiophonic system with wholly digital transcribe and play. AC-3 digital ambiophony system possesses 5.1, five channels that are left/middle/right left ambiophony, and .1 channels is independent big bottom. The five channels are all 20Hz！20kHz whole band type, big bottom is below 120Hz. This kind of AC-3 digital ambiophony has been adopted in LD and DVD dish, and constructed ideal live cinema effect such as live effect, azimuth effect, moving effect etc. 　　　＃What is DTS? 　　　　DTS means digital theatre system, it was invented by American DTS Company, it's actually a coding/decoding system, it code 20 bit bus acoustical message by 16 bit linear PCM model, when replay, DTS decoder decoded it into independent 6 channels acoustics, let you learn through outstanding acoustics fidelity the same as CD. 　　　＃What is the difference between DTS and DOLBY Digital (AC-3)? 　　　　DOLBY Digital (AC-3) is designed for 2 channels overlapping play at the earliest, but AC-3 can also supply 6 channels overlapping play, it just take 1/3 space of DVD dishes which are in DTS format, compress digital code at the rate of 12:1, so it can contain three languages, made tidbits or other extra content. Otherwise, the compress rate of DTS is lower, but the acoustic fidelity is approach to ＾Original Bus￣.