Strictly speaking, THX does not completely calculate a surround sound codec system. It's just a standard for Dolby's professional logic model, or it's just a more complete Dolby professional logic model. However, in terms of the general Dolby professional logic mode, THX's surround sound field reproduction is more realistic, the bass is more powerful, and the technology has relatively improved, so it is classified as a mode.
Compared to traditional Dolby Pro Logic systems, the THX Home Theater System is an extension of Dolby Pro Logic. In the five-way surround sound field composed of left, middle, right and two surrounds of the Dolby professional logic system, the THX system boldly introduces a low-occupation channel, and the surround sound channel is subtly sub-voiced. Becomes an analog stereo sound.
The THX home theater system has more detailed requirements in terms of speaker placement. For example, the surround sound channel speaker is placed. The THX system requires that the surround speaker must be hung behind the listener's ear to improve the sound wave spread of the surround sound during playback, making it difficult for the voice to perceive the surround. The time difference between the speakers during playback makes a more realistic listening experience.
Generally, in the case of ±3 dB, the low-frequency lower limit frequency of the main channel speaker is above 50 Hz, which does not take into account the 20-40 Hz bass reproduction area; in a real cinema, it is the low frequency within 20-150 Hz. The signal directly brings people a shocking respect. It can be seen that the signal reproduction in the 20-40 Hz frequency band is lacking in the traditional Dolby professional logic mode, which directly affects the performance of the overall sound effect in the home theater. In the THX mode, the method of separately adding the bass channel has effectively solved the problem of insufficient bass reproduction. AV amplifiers marked with THX mark should be connected to the active low speaker by the standby group or multiple sets of low frequency signal output. Some FHX AV amplifiers have a low-frequency signal power amplifier that can be directly connected to a passive subwoofer.
The THX home theater system is designed according to the theater's live sound environment. Since the real theater area is far larger than the home theater's audio-visual room area, there will be a distance between the front-end field sounder and the audience in the theater, resulting in a high-pitched sound. Part of the signal needs to be increased during production to enhance the high-pitched information that is clearly absorbed by the air. In contrast, in a home theater system, this work is re-adjusted as needed. Artificially reduce the specially increased high-pitched signal to the appropriate level to create a true cinema effect. To this end, a "re-equalization line" has been specially designed in the THX decoder to ensure that each channel can reproduce the best results on the spot.
When it comes to THX mode, you have to talk about the THX standard. In any home theater system, every link can be referenced to the THX standard. This is because the THX standard can more fully reflect the basic qualities of a standard home theater system. As a recognized standard, the THX standard also has reference value for products in non-THX systems in home theater systems.
The THX standard is currently an important standard for measuring sound systems in home theaters. It is a quasi-professional scale based on Dolby's professional logic.
The content of the THX standard mainly has F6 aspects:
(a) The vocal dialogue is clear and the level is clear;
(b) The sound field is positioned accurately and the sound direction is strong;
(c) Even surround sound, coordinated with the main channel and the center channel;
(d) also far frequency response is straight;
(e) Dynamic and excellent transient performance;
(f) Reproduce balance and correct Ken source movement.
General AV equipment configuration, can refer to the requirements of the standard to measure and improve the quality and matching of equipment. The f(n) strip in the THX standard is set for the center speaker because the voice dialogue is the main job of the center speaker. The quality of the center speaker directly affects the sound effect in front.
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