Previously, we introduced "Support for Dolby Atmosphere Home Theater AV Amplifier and Speaker Recommendations", "Comprehensive Analysis of Dolby Atmos Home Theater Raiders", and "All-round illustration of various Dolby Atmos Dolby panoramic sound box placement solutions", if You are only a shallow understanding, Dolby panoramic sound is only through the way of late mixing, joined the ceiling channel, then I can only say that you think of Dolby engineers too simple.
When our editors thoroughly read Dolby Atmos's white papers and various domestic and foreign media materials, we thought it was necessary to introduce the equipment and placement of Dolby Panorama before listening to an ordinary consumer and user. Understand the knowledge, come and sort it out carefully.
Not a simple 7.1 channel upgrade
From the 5.1 era of Dolby Digital to the Dolby TrueHD 7.1 era, we can think of Dolby's work by assigning various sounds to these speakers in 5.1 or 7.1 channels, and then increasing the amount of data to improve the sound. Fidelity. If you still think that Dolby Atmosphere is working in this way, it is a big mistake. The increase in the number of home theater channels is affirmative. This is a trend, but in the traditional way, the problem of excessive data volume and unsuitable storage will be faced sooner or later.
What is the difference between Dolby Atmos and the traditional home theater system based on the channel?
Dolby Atmos is the first home theater system based on audio objects rather than channels. What is a sound object? Any sound you hear in a movie scene is a sound object, such as a child's shouts, a helicopter's take-off sound, and a car's whistle. Using film Dolby panoramic sound, filmmakers can accurately determine the sounding position of these sounds and accurately control the displacement of the sound as the plot progresses.
Conceiving sound in this way does not have the limitations of a channel-based audio system. In a channel-based system, the filmmaker needs to consider the speaker settings: Does the sound come from left surround or left surround? With Dolby Atmos, the filmmaker only needs to consider the storyline: the child yells Shouting where to go? Whether in a movie theater or a home theater, the Dolby Atmos sound system can intelligently decide which speakers to use to accurately reproduce the direction in which the filmmaker wants to present.
Moreover, Dolby Atmos is more flexible and adaptable than a channel-based home theater. Playing channel-based content in a channel-based system, the number of speakers is fixed: 7.1 systems typically contain 7 speakers and 1 woofer. With Dolby Atmos, the opposite is true, and you have an unparalleled flexibility: 8 speakers (5.1.2) for a perfect experience, or more speakers for a fuller, more detailed listener the sound of. When adding speakers, the receiver that supports Dolby Atmos automatically determines how to use the speakers to create a wonderful, immersive sound.
Why is the panoramic video like a web game?
Dolby panoramic sound composition
The sound is three-dimensional. To restore the natural sound perfectly, it is obviously not enough to rely on a speaker that is divided into five groups or seven groups of sound effects. In order for the sound to be perfectly positioned both horizontally and vertically, it depends on different solutions. Dolby proposed the most natural sound (Dolby Atmos) consisting of Bed Audio, audio object and (Metadata) panoramic source data. If this is still a bit of an image, then I use a metaphor that everyone can understand! The panoramic sound technology is very much like a large online game! And Bed Audio is equivalent to a big map in online games, the audio object is equivalent to inside. The character of the walk, Metadata is equivalent to the coordinates of the character triggering the event in the map.
Bed: Movie sound effects can't all be objects, so it's like there are only actors on the stage, no background, so Atmos provides the so-called Bed sound, which is the basis of all the sounds of the whole movie, you can understand that this is the most traditional 5.1 or 7.1 channels.
Object: A set of sound effects that exist in a three-dimensional space. For example, in the Dolby panoramic sound demonstration disc, the leaf that rotates the leaf is a standard object, which is Object.
Metadata: It is to record the position coordinates, audio and video size, moving time and other related information of the object. You can imagine the sound of a bomb explosion in the train and the top of the head. In addition to their different positions, the size of the sound image and the time state of the presentation will be different.
After defining the audio object, Atmos will automatically distribute this information to each channel.
The basis of traditional multi-channel coding is to consider several channels and then put the sound in. And Dolby Atmos only used the stage of the sound of the test, what happened, and what happened. As for how many channels to use, what sounds are being made in the speakers, the power producers don't have to think about it. Because Atmos's system automatically calculates and uses these speakers to display the complete panoramic sound effect according to the playing conditions of the scene, regardless of the number and position of the speakers, it will be flexibly utilized. This is the Atmos logic based on sound objects. Therefore, the Atmos system must have sound from above, which is to give the stereo coordinate position of the sound. As for whether the speaker in this aspect is mounted on the ceiling or the sound from the floor is hitting the sky, it doesn't matter.
What is the difference between the 5.1 channel Atmos system and the traditional 5.1 channel?
The principle of Dolby Atmos is described above, so let's use an example to give you a deep understanding of 5.1. The Atmos system is different from the traditional 5.1 channel cinema. I use the cinema to give an example, because the wall of the electric power yard is a row of speakers, which is easier to explain clearly. In the case of the traditional 5.1 technology, the speaker array in the right rear half of the seat can only emit one channel of sound, which is right surround. If it is Atmos technology, a certain sound object (Object) sound can start from the right-hand speaker, one speaker slowly walks to the back of the seat, creating a clear movement of the audio, rather than the single sound of the whole face, this is There is a significant difference between Channel-based and sound objects as the underlying Object-based.
That is to say, whether it is 5.1.2 or 24.1.10, the audio tracks of Atoms can be exactly the same, and it is no longer necessary to record two tracks like the previous 5.1 and 7.1.
And this is where many people will be confused, because when Atmos is placed in the family theater, there is only one or two speakers at the right rear of the seat, so it will be concluded that Atmos is just the conclusion of the upper channel, the fact The essence is different. Maybe you think that the Atmos of the home version is not as good as the movie theater? It can't be said that the 5.1 system is based on the convenience of the consumer to set up the system. In fact, due to the advanced nature of Atmos coding, the channel upgrade of the home theater function is changed. It's easier than ever. As long as the amplifier manufacturers believe that there is a market, there will be dozens of channels of panoramic sound home theater systems next year.
Applications:
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Design:
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