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 built on a 5.1 channel. 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 again decoded from the left and right surround channels by matrix decoding. separate from. 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.
When it comes to THX, you can't help mention THX certification. THX certification has a strict and specific set of requirements for playback equipment, such as audio and video sources, amplifiers, speakers and even connecting wires. The THX logo is awarded to products that meet this standard and passed the Lucas certification. For home theater, the THX logo refers to the components of its system, such as the sound processor and speaker system, which meets the Lucas Film THX and their unique playback processing parameters. So simply, “THX†is an ISO 9001-certified specification that is a quality certification standard used to identify hardware and software quality in home entertainment systems. Home entertainment system products with the "THX" mark have undergone a series of rigorous laboratory tests and listening tests conducted by experts from Lucasfilm.
At present, THX certification mainly includes THX Select, THX Ultra and THX Ultra 2. THX Select is designed for space above 2000 cubic feet (about 5.5 square feet) and THX Ultra is designed for more than 3000 cubic feet (about 8.3 square feet). Simply put, THX Select provides consumers with a limited budget, and THX Ultra provides a more professional consumer reference. The latest certification is the THX Ultra2, a new specification designed for full output 7.1-channel audio, providing an extremely wide sound field scale for a wider range of listening spaces and balancing the sound between channels. The control is made more refined. In addition, the performance of the need to promote low-impedance speakers and higher noise ratio characteristics to correspond to the latest high-quality digital audio sources, so rigorous testing to obtain THX ULTRA 2 certification. The following conditions are available for each home THX audio system:
1. Re-equalization of the line, the main function of this line is to pull back the medium and high frequency deliberately pulled up in the filming process, and eliminate the sound over-the-counter and over-mixing in the home theater playback. It mixes the sound. The sound overshoot in the process has been corrected.
2. Sound quality matching Timbre Matching, the function of this line is mainly to adjust the sound quality of the surround sound, and the sound quality of the front main channel is more flexible, so that the surround sound and the home field are completely combined into a surround. Sound quality matching is a technology that specifically matches your front speakers to the listening environment, because in a typical home theater there are only two surround speakers, not the full range of configurations in the cinema.
3. Decorrlation, the main function of this line is to realize the speaker with two side channel two-way sound design, and reproduce the same effect as multiple surround sound speakers in the cinema. The inter-compliance line allows you to have a "stereoscopic" sound when listening to music, even when playing the live sound, the simplification and automatic button disconnection will not affect the stereo display.
It should be noted that whether the product obtains THX certification does not represent the quality of the product. It can only be said that the THX certification is subject to specific specifications on behalf of its products, and it can easily achieve a balance point in the home theater effect. After all, THX certification is not compulsive. To put it bluntly, it is a commercial means—the fact that it has been through standardization, collective marketing, and monopoly. Non-THX certification still has a lot of excellent products, waiting for you to know the hero.
OBD Connector Section.
OBD:On Board Diagnostics.
One is to connect to the OBD interface of the vehicle through a special data line. Reading out the data and displaying it on the matching display screen is basically equivalent to adding a driving computer display screen. At ordinary times, the connecting cable can be plugged into the OBD interface all the time without removing it, and only the fixed display screen is needed. The owner can choose the data to be displayed by himself
OBD Connector Section
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