[Home Theater Network HDAV.com.cn] After understanding the surround sound effects of Dolby Atmos that emphasize the sound details of the entire space object, users who want to build or upgrade to Dolby Atmos need to consider the source and AV amplifier first. The setting, which is one of the key factors in achieving Dolby Atmos surround sound.
In the previous topic about Dolby Atmos, we mentioned the four conditions that must be built for system construction. The first two are the need for a source device that plays Dolby Atmos sound, and an AV amplifier that is compatible with Dolby Atmos sound processing. Or surround sound processor. It is not difficult to meet these two conditions now. In particular, Dolby Atmos does not have much requirements for Blu-ray players. As long as it has audio source output, I believe that in addition to the early Blu-ray players, the current mainstream models can be realized. There are not too many special requirements for the setting of the Blu-ray player. It should be noted that if a mid-to-high end Blu-ray player offers the option of a second audio logo, it needs to be turned off. In the process of testing, we used OPPO BDP-105d and Pioneer BDP-LX58, two popular mid-to-high-end Blu-ray players, which did not encounter too many problems, and can successfully output the source code of DolbyAtmos to Among the AV amplifiers.
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At this point, I am afraid that some friends do not understand why ordinary Blu-ray machines can output Dolby Atmos audio tracks. In fact, the main reason is that the sound of DolbyAtmos has been integrated into the audio format of two Blu-ray discs or digital surround sound signals, such as Dolby TrueHD and Dolby Digital Plus, respectively. The amplifier or surround processor does not have the decoding and processing power of Dolby Atmos, and it outputs two traditional channel-based HD audio systems, Dolby TrueHD and Dolby Digital Plus. In terms of compatibility, in fact, from the early Dolby Digital to the complete backward compatibility of Dolby TrueHD and Dolby Digital Plus, you can see that Dolby is doing very well. Here, we have collected a list of Blu-ray discs with Dolby Atmos sounds that have been released before the release. The list is not complete. The films covered are mainly some exciting action movies. Among them, "Transformers 4: Extinct Reborn" and "The Death Squad 3" are masterpieces of 2014, showing the sound of Dolby Atmos in the whole space. Features have many advantages. It is worth mentioning that in addition to foreign films, Hong Kong-made movies such as "Eavesdropping 3" and "Anti-Virus" are also excellent works of Dolby Atmos sound.
In addition to these movies, we also have the Dolby Atmos Demonstration Disc Blu-ray demo disc released by Dolby last August. This Blu-ray demo disc differs from a series of Blu-ray discs that Dolby regularly introduces. There is also an analysis and introduction to Dolby Atmos Home Edition technology, and is also created and replayed by Dolby and home theater systems. The director of the field, Graig V.Eggers, and Brett Crockett, senior director of sound technology research and development at Dolby Atmos's technology research and development work, gave an in-depth explanation.
Below, we will talk about the settings and overall sound performance of the three representative Dolby Atmos Blu-ray discs, "Dolby Atmos Demonstration Disc", "Transformers 4: Extinct Rebirth" and "Antivirus". First of all, in terms of audio settings, the three Blu-ray discs are not too complicated. For Dolby Atmos Demonstration Disc, you can select two Dolby Atmos sounds under Dolby TrueHD or Dolby Digital Plus. The other two are not so detailed, only Dolby Atmos with Dolby Atmos or Dolby TureHD. In terms of sound, Dolby Atmos under Dolby TrueHD has a higher density of sound details, more impact and surround. According to Blu-ray discs, most Dolby Atmos Blu-ray movies should be directly produced using Dolby TureHD audio tracks, while Dolby Digital Plus is inferred to be used in digital streaming video playback. Here's a proposal. In the "Anti-Virus" section, there are several demos of Dolby Atmos, which are consistent with the content of Dolby's official disc. If you want to further experience the nuance of Dolby Atmos, you may wish to take a closer look. These few demos.
Next, let's talk about the sound performance of the first two published Dolby Atmos Blu-ray discs, "Transformers 4: Extinct Rebirth" and "Antivirus". On the whole, the two Blu-ray discs have a lot of exciting fighting scenes, including the helicopter flying in the air or the sudden attack of the alien spacecraft, etc., used to demonstrate the Atmos system's ability to accurately rebuild the sound field above. It is a perfect fit, but the sound details of "Transformers 4: Extinct Rebirth" are more abundant, and the sense of presence is more outstanding. In addition, "Anti-Poisoning" is not very good in the live reduction of vocals. The taste of post-recording is too strong. On the contrary, "Transformers 4: Extinct Rebirth" is more realistic.
It can be seen that we can fully appreciate the style of Dolby Atmos through the way of regular Blu-ray discs, and this will become more common as the number of related discs increases in the future. After introducing the signal source, let's talk about the relevant points of the AV amplifier. First of all, most of the Japanese brands including Denon, Pioneer, Onkyo, and Yamaha, as well as European and American brands such as Trinnov Audio, Datasat Digital Entertainment, Storm Audio, Emotiva Audio, and Outlaw Audio. Support for Dolby Atmos with existing models or software upgrades is available. It can be said that most of the models launched at the beginning of last year have the opportunity to upgrade to Dolby Atmos through software. If you want to know if your AV amplifier can support Dolby Atmos, the easiest way is to see if the HDMI output terminal of the amplifier reaches 1.4. Or the above standards, if it is, will support the software upgrade of Dolby Atmos to a large extent. In addition, it is also possible to judge whether the AV amplifier can support Dolby Atmos through the speaker output terminal on the back of the AV amplifier. If there are multiple partition outputs or the speaker output terminal of Height (the upper channel), there is a greater possibility. .
In addition, since the main manufacturers of Dolby Atmos chip decoding are Analog Devices, Cirrus Logic and Texas Instruments, you can also judge whether you can upgrade to Dolby Atmos by using the audio processing chip model inside the AV amplifier.
Recently, we have carefully tested the top three Japanese-integrated AV amplifiers, Denon AVR-X5200W, Pioneer SC-LX88 and Yamaha RX-A3040, which fully support Dolby Atmos decoding and rendering. However, in actual use, we found that these amplifiers can not automatically detect the number and type of speakers connected in the room, must enter the corresponding menu for manual setting, and the three amplifiers use a completely different control interface. And the overall operation is more complicated, and it is quite difficult for ordinary users or players who are just getting started.
We recommend that if you are familiar with the AV amplifier settings, try to use manual settings, and then use the sound pressure meter and RTA real-time analyzer to finely adjust the sound of the room. If you only know a little bit or even don't understand it, first choose the speaker system configuration you are using in the speaker system, such as 5.1.2 or 7.1.4, etc., and then pass the room automatic sound field correction system in the AV amplifier. Tests and settings can generally achieve better sound performance.
According to the current performance level of AV amplifiers, 7.1.4 or 9.1.2 will be a more common system configuration. If the room size is large and does not care about the construction cost, we can also pass the high performance like Trinnov Altitude32. The AV amplifier implements the Dolby Atmos system with 20.2.10 configuration, and 10 ceiling speakers will fully release the potential of Dolby Atmos, presenting the cinematic sound of Dolby Atmos.
The second key to achieving Dolby Atmos surround sound is the unique top sound field speaker selection and system setup, especially for the two top sound field speakers. Dolby Atmos Home Edition and other next-generation home surround sounds. The biggest difference in the system.
The easiest and most straightforward way to create the sound field above is to install the speakers on the ceiling. The Dolby official emphasizes that this installation should have at least twice the height of the ceiling, which is about 2.4 meters or more. Height, and also requires targeted sound absorption or diffusion treatment on the surrounding walls, floors and ceilings to reduce the effects of unwanted sound reflections. The characteristics of the speaker are also required, it must be a full-range speaker, the frequency response range should be 100Hz-10kHz or wider, the off-axis diffusion angle is above 45°, and the vertical downward installation mode is adopted, if the off-axis performance is weak. The speaker needs to have a certain high-frequency directivity adjustment method, pointing the tweeter to the main listening area.
The way to install the speakers directly on the ceiling is not suitable for all environments, and to install the speakers on the ceiling that has been sound-absorbing or diffusing, it is necessary to reconsider the problem of acoustic treatment, followed by rewiring and mounting. No small problem. To this end, Dolby came up with an upper sound field solution based on sound reflection. This kind of speaker only needs to be placed on the ground, and it sounds upwards. It is a natural practice to transmit the sound to the listening area through the reflection of smallpox. Dolby calls it Dolby Atmos enabled speakers (which can achieve Dolby Atmos effect). Speaker).
From a structural point of view, this special type of speaker can be divided into two categories, one is the integrated speaker, in the traditional speaker box has the front high-range woofer and the upper sound field unit, and the speaker terminal is also divided into the front Enter with the top two groups. The other is the independent upper sound field speaker module. The built-in upper sound field unit can be used to set up the Dolby Atmos system by placing it on a normal speaker. The height of such speakers should be slightly higher than the height of the human ear sitting on the seat, but avoid heights above half the wall. The horizontal distance from the listening position should also be at least about 0.9 meters, preferably at a distance of 1.5 meters or more. If the height of the upper sound field speaker is beyond the position of the listener's head, consider placing a closer distance. However, when using modular speakers, be aware that they should be placed above the main and surround speakers, or above 0.9 meters, and placed horizontally, while keeping the unit facing the ceiling.
Although the upper sound field speaker is more convenient to install and use, there is no need to open the pylon on the ceiling, but there are certain requirements for the surface and material of the ceiling. Smallpox must be flat, can not have beams or curved, height is less than 4.27 meters, using acoustically reflective materials such as drywall, plastic, screen or other hard materials, and can not have sound absorbing materials. The height of the ideal ceiling should be around 2.44-3.66 meters. In addition, the surrounding walls and floors, like the ceiling speakers, need to adopt sound absorption or diffusion treatment to solve the problem of unnecessary reflection sound. Basically, except for the first reflection sound sent to the ceiling, the rest of the reflection sounds are Need sound absorption or diffusion treatment.
Dolby official requirements for the number of sound field speakers on the scene, must be in even form, 2, 4, 6, 8, or 10, should not appear singular, and it is best to choose 4 or more to get More realistic sense of the scene. In addition, the new upper sound field speaker can provide better diffusion characteristics than the independent ceiling speaker, and the independent ceiling speaker has more accurate sound detail position change. If the height of the ceiling in the home is short, it is not suitable to install the independent ceiling speaker, because the effect of the speaker on the head will be more direct, lacking diffuseness and attracting attention, destroying the effect of viewing.
In terms of overall speaker system configuration, the most important thing is to see how many speakers the AV amplifier or surround sound processor can support. At present, the Japanese brand can achieve up to 4 upper sound field speakers, and some European and American brands can achieve up to 10. Therefore, before purchasing a ceiling speaker, we must first understand what kind of speaker system configuration your AV amplifier can support. In addition, if the original system is upgraded, the 5.1 or 7.1-channel speaker system should be placed at the listening height of the human ear, about 1.2 meters. If the surround speaker is placed too high, it will affect the object sound in space. The accuracy of the positioning, after all, recording post-production is based on such speaker settings.
Looking back at the key elements of understanding and implementing the Dolby Atmos system, we can see the breakthrough significance of Dolby Atmos. The emergence of Dolby Atmos was also born to solve the bottleneck encountered in film sound recording. After entering the family, Dolby gave Atmos more family elements, and made many adjustments for the home field, worthy of other surround sound technology manufacturers. Learning. Below we will bring you a set of representative configuration solutions for the home Dolby Atmos audio system, and hope to help users who want to build Atmos system in the near future.
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