College】 【weak full resolution multi-channel audio standards --- Power By 【China】 weak home network.

<br> with the "HD" (HD HighDefinition resolution referred to in English) became the latest hotspot, the attention of many audio and video enthusiasts mostly concentrated in the high-definition video playback device: Blu-ray DVD player, Full HD .TV, 1080p projector, the topic will become the player seems to ignore the "HD" system includes high-quality multi-channel audio standards, today we look back on the development of multi-channel audio standards context. .<BR> <BR> Dolby (Dolby) multi-channel audio standards <BR> <BR> Dolby Laboratories (Dolby company's registered name) is by the Americans: RMDOLBY Dr established, initially founded in the UK, .After 1976, the company's main jobs to San Francisco. .Dolby is a leading analog / digital audio setting body, has invented the Dolby noise reduction system, Dolby surround sound system, a number of technical, industrial and home audio for film sound technology had a tremendous impact. .<BR> <BR> 1965, the first Dolby A-type noise reduction device born of recording industry for many years thereafter, Dolby Laboratories has developed a series of technology: C-type noise reduction, SR (spectral recording), .S-type noise reduction, HXPro, Dolby Stereo, Dolby Surround, Dolby Pro Logic, AC-1, AC-2, Dolby Digital (AC-3), Dolby Headphone, Dolby E and so on. .These technologies are widely used in professional audio equipment and civilian, film recording, theater playback equipment, digital broadcasting and so on. .<BR> <BR> Dolby Pro Logic surround sound despite the excellent results, but still belongs to the scope of simulation technology has inherent deficiencies. .As digital technology becomes more mature and the next generation of television broadcasting requirements, Dolby Laboratories, Pioneer Corporation and released in 1994, they co-developed a new digital multi-channel TV sound system: AudioCoding-3 (referred to as AC-3 .), 1997 and changed its name to Dolby Digital (DOLBYDIGITAL), which is based on Pro Logic surround sound based on the pure digital audio standard, a large cinema and home theater can be used. .Dolby TrueHD <BR> <BR> is designed for high-definition disc media lossless compression technology developed by (a HDDVD mandatory audio standard, optional Blu-ray standard, the current high definition HDDVD already fading stage), one on technical principles, .In fact, and before the DVD-audio is somewhat similar, but can support up to up to 13.1 channels, reached a 18Mbps maximum bit stream is huge, BT is an audio stream (use the HDMI interface transfer, the traditional digital interface has been .The audio stream can not satisfy the transmission), the richness and clarity of the information the most differed from the studio master, so that users can enjoy high-definition images, but also to enjoy the amazing voice. .<BR> <BR> Dolby TrueHD technology Blu-ray format can support up to eight full-band lossless channel, sampling rate up to 192kHz, 5.1 surround sound can be used not only, but also supports 7.1 surround sound (note not the virtual .out of the Dolby 7.1, but a real 7.1). .<BR> <BR> <BR> <BR> DTS multi-channel standard <BR> <BR> DTS (DigitalTheatreSystem Digital Theater Systems) is an American addition, a very powerful digital audio format to develop the company, is headquartered in Los Angeles, the company .divided into two parts: one is based on the recording film music and cinema site coding and decoding based professional with the "Digital Cinema System", another part of the family and with the development of decoders DVD / LD / CD package, etc. .Software-based consumer electronics with the "DTS technology" into two parts. .<BR> <BR> Almost all of the 5.1-channel surround sound processors have used DTS decoding technology, worldwide there are over 300 million units of consumer electronics products using DTS technology and passed the certification, influence, and Dolby .company called nearly tied. .<BR> <BR> DTS has introduced a lot of multi-channel technology, which DTSDigitalSurround the most influential one, is 5.1 channel system, it is often said that the DTS technology, or DTS surround, generally refers to DTSDigitalSurround. .DTS with CAC (CoherentAcousticsCoding, coherent acoustic coding) approach work, and also belong to the same DolbyDigital psychoacoustic principles to use sound track encoded on the lossy digital compression technology. .In the cinema, DTS's sound track record to take a special Digital stereo separation of sound and picture, digital sound track recorded on CD-ROM, CD-ROM drive from the dedicated reader, while the analog sound track in the copy and the record between the time frame .synchronization code, used to control the optical drive is also sound and picture synchronization. .<BR> <BR> DTS-HD (HighDefinition) format has been used for the next generation of digital cinema and Blu-ray and HDDVD discs to support the backward-compatible DTS Digital Surround, DTS-ES, DTS96/24, with higher inter- .replacement and expansion of, the sampling frequency and channel selection is also more flexible, but the compression ratio is still smaller than the Dolby Digitalplus, less loss of sound information, details of the more abundant. .<BR> <BR> DTS-HDMasterAudio is the top standard DTS audio format is truly lossless compression, with high variable bit rate, in the Blu-ray disc up to 24.5Mbps (very scary .audio streaming), supports 7.1 channel independently, and Dolby TrueHD, as can be brought in line with the master recording 96kHz/24bit digital surround sound, also need HDMI interface transfer. .<BR> <BR> DTSCD, is encoded with DTS multi-channel audio carrier, stored with the same general music CD, are quantified 16bit, 44.1kHz sampling frequency (but ordinary CD sampling signal for the PCM), which .CD is now relatively common species, many record companies had issued such a CD. .<BR> <BR> Appendix: <BR> <BR> DTS: DigitalTheatreSystem, is the end of 1996 launched the development of a model derived from the digital theater surround sound system. .The core of home theater DTS DTS decoder, it can DVD, CD's Dolby Digital decoder, 5.1 channel output information can also choose to DTS mode, the output 6-channel information. .<BR> <BR> DTS Surround: DTSDigitalSurround, DTS using CAC (CoherentAcousticsCoding, equivalent acoustic coding) methods work, and also belong to the same DolbyDigital use psychoacoustic principles to be encoded on the sound track of the number of lossy compression techniques. .In the cinema, DTS's sound track record to take a special Digital stereo separation of sound and picture, digital sound track recorded on CD-ROM, CD-ROM drive from the dedicated reader, while the analog sound track in the copy and the record between the time frame .synchronization code, used to control the optical drive is also sound and picture synchronization. .<BR> <BR> DTS advantages: <BR> <BR> compared to Dolby Laboratories Dolby AC-3 surround modes, DTS system not only has the function around its horizontal orientation, but also strengthened the effect of deep cross-orientation .. .DTS has a higher data traffic, better sound quality playback, coupled to high bit, high sampling rate and other measures to make the pursuit of further reproduce the original sound, sound more beautiful. .<BR> <BR> DTS to 20bit 48kHz frequency in the work, to provide 6-channel information, it creates surround sound out of the range, many AV enthusiasts can meet the most demanding requirements. .Listening were completely surrounded by this momentum, the real 360-degree digital surround sound experience. .The shock effect of AC-3 can not match. .<BR> <BR> DTS fans can replay the pursuit of HDCD, DTS sound means that the performance can significantly beyond any current best CD recording. .<BR> <BR> <BR> THX audio standard <BR> <BR> not talking about "THX", non-video enthusiasts may not know, thx also commonly used in English instead of thanks, it is a dilemma. .In fact, "THX" is a very rigorous technical certification theater (some people mistakenly think is a sound standard, in fact, it is with the DTS, Dolby series, there is a difference), is by the famous movie master George Lucas film .the company developed a certification system Lucasfilm. .(TomlinsonHolmanExperiment the prefix abbreviation), the certification due to the very harsh, home audio-visual equipment certified by the relatively rare. .<BR> <BR> <BR> THX certification guarantees the maximum in the home environment can get close to (Note: It is "close"), the effect of cinema surround sound playback. .In general, through the THX-certified home theater must have the following characteristics: <BR> <BR> 1. The speaker frequency range in the standard should have a smooth response, the level of coverage must meet the listener a wide listening area; <BR .> <BR> 2. Speaker voltage output in a loud, must ensure that no audible distortion and mechanical thermal damage, to ensure that the replay shows the effect of video. .<BR> <BR> 3. Need to be shielded speakers, to ensure that no television sets, video playback equipment, magnetic interference generated image distortion. .<BR> <BR> 4. Sound system's speakers must maintain a high degree of match, the sound field stability, the center speaker and left / right speakers, or sound between the sound image localization without sudden changes. .Surround channel speakers sound radiation characteristics must meet the requirements of diffuse sound field. .<BR> <BR> Finally, and most important point is that among all THX certified products can be generic, comparison between them must be blind to listen to the voice of no significant difference..