THX is a generic term for the professional standards for cinema sound systems developed by Lucas Pictures. THX is not an independent sound system. It improves the Dolby Pro Logic surround system and further enhances the surround sound effect enhanced. THX Surround EX was launched in September 1999 and was first used in the prequel of the movie Star Wars. It is the result of a collaboration between Dolby and Lucas Film, which owns THX. The professional field is licensed by Dolby and is called Dolby Digital. Surround EX, and the certification of the civilian machine is handed over to Lucas Film, called THX SURROUND EX. Therefore, in the early days of the machine that supported Dolby Digital Surround EX decoding, the logo on the panel was actually the THX SURROUND EX logo. THX Surround EX and Dolby Digital Surround EX are based entirely on the same technology.
Specifically, THX Surround EX is a 6.1 or 7.1 channel system based on 5.1 channels. The early THX was a 5.1-channel system that was very close to the Dolby Digital 5.1 channel (actually they were also built on Dolby Pro Logic surround systems). The 5.1 system consists of left, center, right, left surround and right surround, plus the separated subwoofer channels combined with low frequency signals below 200 Hz, for a total of 5.1 channels. THX Surround EX adds 1 or 2 surround channels to this 5.1-channel system. It is placed in the middle of the left and right surround, called surround back. You can see that this is exactly the same as Dolby Digital Surround EX. THX Surround EX converts 5.1 channel to 6.1 and 7.1 channels. Like Dolby Digital Surround EX, it uses matrix coding technology. The surround back channel uses matrix coding technology to separate the surround back from the left and right surround channels. The channel comes. That is to say, when recording the sound effect, the back surround channel is first mixed into the left and right surround channels in a matrix coding manner, and when the replay is performed, the back surround channel is separately again decoded from the left and right surround channels by matrix decoding. The advantage of this is that it contains a more realistic effect of flying over the head or side, with a more stable sound image to set off the movie atmosphere and music, so that the theater or family appreciation has a more harmonious surround effect.
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