"THX" is actually a "product certification", THX is the abbreviation of Tomlinson Holman Experiment, as we often say ISO 90019002 and so on. It is a system certification developed by Lucas Films for commercial cinema. The purpose is to give the specific specifications of the brightness, uniformity, contrast level and sound pressure, sound response, channel balance, room reverberation time, sound insulation requirements, etc. of the cinema screen.
Later, the company's service was developed to the THX certification of audio equipment. If the equipment can meet the requirements of the THX sound field for a certain equipment, it can be certified as a THX equipment. This has THX discs, THX amplifiers and THX speakers, and even many games have to comply with THX certification, such as the recently released "Lord of the Rings". THX certification focuses on video quality, audio quality and reliability.
The THX certification of DVD discs is mainly the certification of the audio and video quality of DVD disc content. It means that your production equipment, process and control methods are in line with THX requirements, then the effect of playing your DVD disc content will also be met. THX requirements. THX focuses on video and audio quality, as video and audio production techniques and detection methods are more difficult. The reliability is relatively simple, especially the pressure plate, you can do it according to the DVD specifications. But it guarantees that all THX- certified DVDs will be fully consistent on all THX- certified DVD playback devices. So to get the best visual and audible effects, your DVD playback device must also comply with THX .
While it seems that THX certification is an insignificant standard, it is indeed worthy of advocating for its demanding standards. For example, T2 Extreme, a well-recognized classic in DVD, originally wanted to use the old video master tape of 1034 line, but it was denied by THX . It forced the artist to make a new 1080 line (new high definition). Video standard) mother acquisition and compression.
So if you see the words " THX " in a DVD movie, then it is the guarantee of the quality of the film.
Currently, THX certification is divided into four types:
1: THX
The THX processing system is divided into three parts, one is Re-Equalization and then equalized; the other is Timbre Matching tone matching; and the third Adaptive Decorrelation is related.
The purpose of re-equalization is to process the sound effects of movies recorded in the large space of the cinema and professional audio equipment, especially for the high-frequency and low-frequency processing to better suit the small space of the home, so that the sound has a better balance.
In a movie theater, the surround channel is not just two surround speakers, but a row of multiple "array" speakers. Therefore, the surround sound of the cinema is surrounded by sound, and its sound is very different from the use of only two or three surround speakers in the home. Tone matching is to process the sound of the movie first, so that the sound from the surround channel of the home can match the sound of the main channel.
The sense of encirclement and encirclement in an ordinary family is very different from that of a movie theater. When enjoying it at home, the best listening point is at the most central position (ie, the emperor's position). As long as you leave this position, the sense of envelopment will be weakened. In order to get a cinema-like immersive on-site surround and a large optimal listening area, THX changes the phase and time delay of one of the surround channels, deliberately causing phase difference and time delay between the two surround channels. This allows for the surround of a cinema-like surround speaker with just two surround speakers. This is the role of related adaptation.
The above three functions of THX are reprocessed after Dolby Digital or DTS decoding, which is automatically effective. In addition, THX also has three small functions such as Bass Management, Bass Peak Level Manager, and Loudspeaker Position Time Synchronization. These three functions are selected in the menu at the request of the user.
Unlike Dolby Digital and DTS, THX 's super bass limit is only 80Hz, not 120Hz. As long as you select the THX setting, all setting parameters will be set according to THX requirements. It can be seen that THX processing is not just a certification mark, its existence will make the sound balance better, and it can make the two surround channels have a dense cinematic feel.
However, the early THX handlers only worked for DVD movie sounds, and the THX handlers were not launched when using other music software, because these sources were not recorded for the cinema space.
2: THX Ultra
Currently, many advanced audio and video amplifier panels are marked with one of THX Ultra or THX Select or THX Ultra2. What do they mean? Simply put, THX Ultra is an upgraded version of THX that is used primarily in larger spaces or where there is better subwoofer performance. Suitable for space around 3000 cubic feet (85m3). However, in the certification of various audio-visual equipment and space, THX Ultra has stricter requirements than the earlier THX .
3: THX Select
THX Select is a small space version of THX Ultra. THX Select focuses on allowing small speakers to get the sound of a large speaker. It is mainly for indoor space of about 2000 cubic feet (57m3), it is only for audio and video amplifiers and speaker certification, while other THX logos can be used for space certification.
4: THX Ultra 2
This is the latest certification from THX . THX Ulrta2 focuses on 8-channel replay processing and certification, requiring the amplifier to have the latest Dolby Digital Surround EX/DTS-ES 6.1 decoding function, and emphasizes that the amplifier must have the ability to control the low frequency of the environment to avoid turbidity. Clear fake bass. Unlike the previous two generations of processing systems, it is equipped with the new ASA (Advanced Speaker Array) advanced speaker array technology and Ulrta2 Cinema/Ulrta2 Music two surround enhancement modes, which can handle both movie sound effects and multi-channel music. The Ulrta2 Cinema mode creates a close-up of multiple surround speakers in the cinema, while the Ulrta2 Music mode delivers a wider surround sound while listening to music. THX Ulrta2 also has the ability to drive low-impedance speakers and higher signal-to-noise ratio characteristics to match the latest high-quality digital audio sources in the future. At the same time, it also has higher requirements for video processing and conversion, requiring the video transmission bandwidth of the machine to reach the HDTV level, at least above 50MHz, and can accept the conversion of progressive scan signals. It also has corresponding requirements for the ease of operation, and is the highest certification standard for home theater equipment.
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