[Home Theater Network HDAV.com.cn] Regardless of your understanding of surround sound processing technology, it is necessary to fully understand Dolby Atmos, a subversive traditional channel-based new generation of surround sound technology. Basically, surround sound systems other than Dolby Atmos are channel technology, mainly in 5.1, 7.1 or 9.1. This channel-based surround sound system has the obvious disadvantage that no matter how many speakers are used in each channel of the system, the sound they emit is the same, and the number of speakers does not increase. Increase the amount of detail in the entire space sound. To increase the sound details of the channel system, it is necessary to add more channels, but it will significantly increase the size of the sound signal, which is not conducive to transmission and storage. To this end, Dolby Atmos introduces the elements of the Sound object on the basis of the channel, which is the key to fully understand Dolby Atmos.
The biggest advantage of Dolby Atmos is that it can greatly enhance the details of the sound in the entire space without greatly increasing the sound signal capacity. This is a revolutionary surround sound technology. The audio signal composition of Dolby Atmos is obviously different from that of channel-based surround sound technology. It mainly includes the sound of a certain point in the whole sound space, and records the metadata of important information such as the coordinate position, audio size and displacement time of each sound effect. And the three major parts of the basic sound, which is recorded as 9.1 channels, mainly for ambient or background sound. Since the data capacity of the first two is not large, there is not much problem stored in the Blu-ray disc. Therefore, movies that incorporate Dolby Atmos sound can still be published as Blu-ray discs, and the sound of Dolby Atmos can be played by a normal Blu-ray player, which is a major advantage of Dolby Atmos's domesticization.
It should be emphasized that the sound of Dolby Atmos belongs to a sound that reflects the position, process and size of an object in a movie. It can be sent through a speaker or a few speakers in the room surrounding the sound box system. This means that if the number of speakers in the room is more, the sound track of the object can be more accurately expressed. Dolby Atmos doesn't tell you how many channels of sound the movie uses, just like traditional channel surround sound, and you need to use at least how many speakers to reproduce this sound. To restore the sound of Dolby Atmos is the AV amplifier. Deciding how many speakers to use in the system depends on the processing power of the AV amplifier itself. The more powerful the AV amplifier is able to analyze the more objects in the surround sound and the associated metadata, and process and re-render according to the number of speakers and settings in the room to present a surround made by Dolby Atmos. Sound effect.
In theory, because Dolby Atmos can create a sound space of up to 9.1 channels of base audio and 118 simultaneous sound objects, you can use hundreds of speakers in your system. However, in the home field, only the speaker system of 5.1.2 to 24.1.10 can be supported, that is, the 5.1.2 system consisting of 5 speakers placed on the ground and two speakers capable of providing overhead sound, and The 24.1.10 system consisting of 24 ground speakers and 10 overhead speakers, pay attention to the middle .1 represents the subwoofer in the system.
It is precisely because the Dolby Atmos surround sound system has added two to ten upper sound effects speakers on our heads. In order to better show the trajectory and process changes of the object sound changes, the ground speakers must be placed at the height of the human ear. In particular, the surround channel speaker is preferably placed at the height of the human ear. If the environment is limited, the ceiling speaker must be installed. The original ceiling speaker must be turned into a head-mounted speaker, and the surround speaker needs to be A pair of feet is additionally installed at the height of the human ear. If there is no way to add a surround speaker, you can only set a pair of overhead speakers or upper sound field speakers facing the front of the room.
Dolby Atmos is a surround sound system that provides sound effects above the sound field, compared to the many surround sound technologies that have been created to create top sound effects (including Dolby ProLogic llz, DTS Neo commonly used in mainstream AV amplifiers). X, Audyssey DSX), the difference is that Dolby Atmos has real top sound information, and does not need to create in a vacuum, the sound presented is more accurate and more positioning, rather than a simple sense of space. However, since there are not many Blu-ray discs that are actually manufactured using Dolby Atmos technology, for movies without Dolby Atmos, the amplifier with Dolby Atmos decoding capability will create the sound of the sound field above in the channel. The speaker in the upper sound field makes a sound. This sound is not as good as the native Dolby Atmos sound, but better than Dolby ProLogic llz.
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