支持杜比全景声扬声器技术白皮书-Dolby Atmos Enabled
Dolby Atmos? Enabled Speaker Technology August 2014
How to Get Dolby Atmos sound with Dolby Atmos enabled speakers
Many of the best Hollywood movies, including Academy Award? winners, are presented in Dolby Atmos? because this new sound technology allows filmmakers unprecedented realism and creative freedom. With Dolby Atmos, content creators can precisely place and move sounds almost anywhere, including overhead, to create a multidimensional listening experience.
This revolutionary technology is now available for your home and will produce audio like nothing you’ve ever heard in a home theater. And you’ll get a great immersive experience no matter what kind of Dolby Atmos home theater setup you have, because the technology automatically adapts the sound to take full advantage of the number and placement of your speakers.
The dimension of height—hearing sounds coming from above you—is key to the Dolby Atmos experience. Reproducing overhead sounds requires new thinking about home theater design. In this white paper, we’ll explain how you can use Dolby Atmos enabled speaker technology to build a system capable of reproducing overhead sound, even if you’re not able to put speakers on your ceiling.
Do I have to replace all of my current speakers to build a Dolby Atmos system?
No.
Many people now have 5.1 or 7.1 systems with a subwoofer and either five or seven speakers positioned at about ear level. Many of these speakers will work without a problem in a Dolby Atmos system.
However, overhead sound is a vital part of the Dolby Atmos experience. Many current home theaters aren’t capable of producing overhead sound, but there are a number of options for adding this capability to any room.
How do I get sound coming from above?
The obvious answer is to install speakers in the ceiling. Most conventional speakers mounted in or on your ceiling will work in a Dolby Atmos home theater.
But installing ceiling speakers may not be possible or desirable for you. Installing speakers in or on your ceiling and running the necessary wiring can be expensive and time consuming. If you rent your home, the property owner may not allow it. And if your ceiling is made of a material such as concrete, plaster, or brick, installing speakers in the ceiling is impossible. Finally, you may not like the look of overhead speakers.
How can I get overhead sound if I don’t mount speakers in my ceiling?
Use Dolby Atmos enabled speakers. Employing a combination of unique physical speaker design and special signal processing, Dolby Atmos enabled speakers allow you to experience overhead sounds from speakers that are placed at the same level as traditional speakers. The new speakers fire upward and reflect sound off the ceiling, as Figure 1 shows, to create a faithful reproduction of audio coming from above.
Figure 1: Dolby Atmos enabled speakers fire sound upward to reflect off the ceiling, creating exceptionally lifelike overhead sound.
You can buy speakers that combine traditional speakers with the upward-firing Dolby Atmos enabled drivers in one cabinet. Or, if you don’t want to replace your current speakers, you can purchase add-on speaker modules
equipped with Dolby Atmos enabled technology that you can place on top of or near your existing speakers.
Will I always get better Dolby Atmos sound with ceiling speakers?
Dolby Atmos enabled speakers produce slightly diffuse overhead audio that is quite lifelike and, in some cases, preferable to the sound that comes from ceiling speakers.
If your ceiling is low or you have to mount your loudspeakers on overhead trusses or brackets, the overhead speakers will be closer to the listening position. The audio may be distracting because you’ll hear exactly which speaker is producing the sound instead of feeling immersed in an atmosphere in which sounds occur naturally overhead.
In this environment, Dolby Atmos enabled speakers may better reproduce the Dolby Atmos sound you would hear in a movie theatre, where the overhead speakers are high in the auditorium, creating a more diffuse experience. Audio experts who have heard Dolby Atmos enabled speakers agree that the sound these produce can be preferable to the sound that ceiling speakers produce.
How does Dolby Atmos enabled speaker technology work?
Dolby Atmos enabled speaker technology produces overhead sounds through a combination of psychoacoustic signal processing and proper direction and angling of the speaker drivers. Dolby provides requirements to manufacturers to ensure that their speakers will perform properly in a Dolby Atmos system for the home. But these requirements are flexible enough to allow manufacturers to maintain their sonic and industrial design.
Dolby Atmos enabled speakers do not rely on virtualized processing. That means you don’t have to sit in one specific spot to get the full Dolby Atmos effect. The same signal and content from your receiver can go to either ceiling-mounted speakers or Dolby Atmos enabled speakers. In fact, Dolby Atmos enabled speakers can also be combined with ceiling-mounted speakers in a home theater environment. (Why would you combine ceiling
and Dolby Atmos enabled speakers? Perhaps you have two speakers already installed in your ceiling, but you want to add two more speakers that can produce overhead sound. You can add two Dolby Atmos enabled speakers and get detailed overhead sound without going to the trouble of installing new speakers in your ceiling.) You’ll hear the same overhead sounds whether you’re using ceiling speak ers, Dolby Atmos enabled speakers, or a combination.
Here are more details about the most important aspects of Dolby Atmos enabled technology.
Psychoacoustic signal processing
Because they are based on an understanding of how the brain interprets sound, Dolby Atmos enabled speakers modify select audio frequencies to reinforce the sense of sound coming from above.
Speaker directivity and angling
Dolby Atmos enabled speakers are designed to fire their acoustic energy upward rather than directly at you. Dolby has calculated the best angle for the upward-firing speaker based on where most people place their floor-mounted tower and stand-mounted loudspeakers and based on standard ceiling heights. As a result, your brain experiences the sound coming from the reflection off the ceiling, rather than from the speaker itself. This works in combination with crossovers and bass management built into many Dolby Atmos enabled speakers and A/V receivers (AVRs) to deliver a compelling and accurate overhead experience.
Will Dolby Atmos enabled speakers work in my room?
Dolby Atmos enabled speakers can produce an incredibly immersive Dolby Atmos experience in many kinds of rooms. You’ll get the best sound if your ceiling is flat (not vaulted or angled) and made of an acoustically reflective material, such as drywall, plaster, concrete, or wood. Dolby designed the technology for rooms with ceiling heights of 8 to 9 feet (2.4 to 2.7 meters), but testing has shown that you can still hear incredible overhead sound in rooms with ceilings as high as 14 feet (4.3 meters), though the effect may become more diffuse in rooms with higher ceilings.
Recessed lighting fixtures, chandeliers, crown molding, and heating or air conditioning vents in your ceiling do not noticeably interfere with the Dolby Atmos experience.
What are the different types of Dolby Atmos enabled speakers?
There are two types of Dolby Atmos enabled speakers: integrated speakers and add-on speaker modules.
Integrated speakers
Integrated speakers include a Dolby Atmos enabled speaker and a traditional front-firing speaker in the same speaker cabinet, as shown in Figure 2. The Dolby Atmos enabled speaker is housed in a separate section of the speaker cabinet and has its own set of binding post inputs. Integrated speakers are great if you’re considering buying new main or surround speakers.
Figure 2: Dolby Atmos enabled integrated speakers include both traditional front-firing speakers and upward-firing speakers. Both sets of speakers have their own binding posts to connect to your A/V receiver.
Add-on modules
Manufacturers are also producing Dolby Atmos enabled speakers in separate cabinets, as shown in Figure 3. These are ideal if you already have main speakers that you like. By adding separate Dolby Atmos enabled add-on
modules, you can get Dolby Atmos sound while keeping your existing equipment. You can put the add-on modules on top of your existing speakers or nearby on another surface.
Figure 3: Dolby Atmos enabled add-on modules include only upward-firing speakers. You can place them on top of your traditional, front-firing speakers or on another surface near them.
How many Dolby Atmos enabled speakers do I need, and how should I set them up?
Dolby recommends that you use four Dolby Atmos enabled speakers when possible. Use of four speakers will make the placement of overhead sounds more accurate, and you’ll get more precise, realistic sounds as an object—such as a helicopter—passes overhead in a video. Two of the speakers (whether they are integrated speakers or add-on modules) should be in the front left and front right speaker locations of your system. The other two should be positioned in the surround sound speaker locations, ideally the rear surround speakers, if you have them.
If you opt to use two Dol by Atmos enabled speakers, you’ll still get a very immersive experience, with sounds moving overhead. Place the Dolby Atmos enabled speakers at the front left and front right speaker locations.
For the best sound, place your speakers at or slightly above the level of your ears when you’re seated. Don’t place the Dolby Atmos enabled speakers higher than half the height of your wall. Make sure the speakers are at least 3 feet (0.9 meter) away from you, ideally 5 feet (1.5 meters) or more. If you’re using add-on modules, place them either on top of your front and
surround (ideally, rear surround) speakers or within 3 feet (0.9 meter) of those speakers.
How should I describe my setup?
With the debut of Dolby Atmos, there is a new method of referring to surround sound speaker configurations (see the “Dolby Atmos for the Home Theater” white paper for more details). It is based on the standard nomenclature (stereo, 5.1, and 7.1 ) but adds a number at the end to specify the number of height speakers you use (for example, 7.1.4).
Figures 4 through 6 show the most common speaker layouts in a Dolby Atmos system for home theater.
Figure 4: A traditional 7.1 speaker layout with four Dolby Atmos enabled speakers (7.1.4).
Figure 5: A traditional 5.1 speaker layout with four Dolby Atmos enabled speakers (5.1.4).
Figure 6: A traditional 5.1 speaker layout with two Dolby Atmos enabled speakers (5.1.2).
How do I connect my Dolby Atmos enabled speakers to my AVR?
Most AVRs that support Dolby Atmos have speaker connections labeled HEIGHT, as in Figure 7. (Some AVRs do not use that label, but they allow you to assign terminals for the height channels.) Connect your Dolby Atmos enabled speakers to those outputs. If you’re using four Dolby Atmos enabled speakers (or think you might in the future), you need an AVR that can support four height speakers.
Figure 7: Rear panel of a 7.2.2 AVR; height speaker connections are at right.
Conclusion
With Dolby Atmos enabled technology, you can get the overhead sound that is a cornerstone of the Dolby Atmos experience conveniently and efficiently, with products that look great and won’t break the bank. Dolby Atmos enabled speakers should be popular with many home entertainment
enthusiasts because they provide the flexibility needed to create a Dolby Atmos system in virtually any home and for many different budgets.
Dolby, Dolby Atmos, and the double-D symbol are registered trademarks of Dolby Laboratories. Academy Awards is a trademark and service mark of the Academy of Motion Picture Arts and Sciences. ? 2014 Dolby Laboratories, Inc. All rights reserved. S14/28204
支持杜比全景声扬声器技术白皮书-Dolby Atmos Enabled
Dolby Atmos? Enabled Speaker Technology August 2014
How to Get Dolby Atmos sound with Dolby Atmos enabled speakers Many of the best Hollywood movies, including Academy Award? winners, are presented in Dolby Atmos? because this new sound technology allows filmmakers unprecedented realism and creative freedom. With Dolby Atmos, content creators can precisely place and move sounds almost anywhere, including overhead, to create a multidimensional listening experience. This revolutionary technology is now available for your home and will produce audio like nothing you’ve ever heard in a home theater. And you’ll get a great immersive experience no matter what kind of Dolby Atmos home theater setup you have, because the technology automatically adapts the sound to take full advantage of the number and placement of your speakers. The dimension of height—hearing sounds coming from above you—is key to the Dolby Atmos experience. Reproducing overhead sounds requires new thinking about home theater design. In this white paper, we’ll explain how you can use Dolby Atmos enabled speaker technology to build a system capable of reproducing overhead sound, even if you’re not able to put speakers on your ceiling. Do I have to replace all of my current speakers to build a Dolby Atmos system? No. Many people now have 5.1 or 7.1 systems with a subwoofer and either five or seven speakers positioned at about ear level. Many of these speakers will work without a problem in a Dolby Atmos system. However, overhead sound is a vital part of the Dolby Atmos experience. Many current home theaters aren’t capable of producing overhead sound, but there are a number of options for adding this capability to any room.
杜比全景声,单声道、立体声、5.1、7.1声道重点讲义资料
杜比全景声知多少 《地心引力》混录师与杜比总监联袂亲解 在了解杜比全景声之前，我们有必要了解一下在它之前的一些常见声音格式。Stuart说，回顾电影和影院的声音演进历史，最开始时是单声道（Mono），然后是立体声（Stereo），其后是环绕声（Surround），再其后是5.1和7.1声道，理论上接下来将是9.1、11.1甚至13.1声道。 单声道：只在银幕背后中间位置设置一个扬声器，由此得名单声道：（下图） 立体声：在前者基础上，将单声道的中间扬声器扩展为左右对称的两个扬声器（土色），从而变为了两个声道，由此得名立体声：（下图）
环绕声：在前者基础上，在观众席的两侧和后面增加了一组扬声器（紫色），让声音真正实现环绕观众，由此得名环绕声：（下图） 5.1声道：在前者基础上，将环绕声道一分为二，分为左环绕（蓝色）和右环绕（粉色），银幕前方还增加了重低音效果音箱（Subwoofer）。综上，有银幕中央声道、银幕左右声道、环绕左右声道这5个声道，再加上所谓0.1声道的重低音声道，由此得名5.1声道：（下图）
7.1声道：在前者基础上，将环绕声道一分为四，有了左侧环绕（蓝色）、右侧环绕（粉色）、左后环绕（黄色）和右后环绕（绿色），比5.1多了2个声道，由此得名7.1声道：（下图） 推出杜比全景声的必要性 Stuart表示，虽然已经有这么多声音格式上的变革，但从电影制作者的反馈来看，这些变革和进步还是不够。
如图1和图2所示，在5.1声道中，如果想实现直升机声音的移动效果，声音不是在右侧环绕区域（图1），就是在左侧环绕区域（图2），也就是从影院的一侧跳到另一侧，这种跳跃并不是真正的移动效果。 在7.1声道中，直升机的声音从右环绕到右后环绕，再到左后环绕，最后到左环绕（即声音依次从粉、绿、黄、蓝色扬声器发出），实现了声音的移动效果，但是还不够精确后来杜比公司尝试了9.1、11.1、13.1声道，但声道的增加只是量变，不能带来质变。其实早在1953年，早期电影立体声最伟大的改革者之一Harvey Fletcher就说过，重要的不是有多少声道，而是要让人感觉声音无处不在。而基于声道的声音解决方案并不能满足电影制作者更精确地控制声音的愿望，也不能完全让观众感受到声音的无处不在。因此在这种情况下，杜比有必要推出一种本质上不同于以往的声音格式，那就是杜比全景声。
5全景声3D7.2.4影音系统
序号 名 称 产品型号 图 片 单价（元） 数量 单位 合价 品牌 描 述 一影院电源管理系统主材 01电源净化发烧6位排插B6-HE ￥635.001台￥635.00Copper Colour 很多用户在影音房施工中常常对电源部分不重视，这个是一个很错误的观念！在影音系统中，功放、碟机、低音炮等等设备都需要通电使用，有足够大的电流量以及稳定的电压，才能给器材工作时提供强大的电源。和人吃饭道理一样，电器电源稳定充 足，器材工作时才能有更好的保障！ 02电源线芬尼SE ￥320.001根￥320.00Copper Colour coppercolour芬尼最粗壮的电源线型号，超高性价比发烧电源线，适合大电流音响设备（如功放、电源排插、滤波插座等）使用，声音秒杀一切高防假 冒品!发烧友必选神器! 03￥955.00 二影院音频系统（杜比全景声7.2.4）主材 01主音箱(入墙）KL-7800￥5,280.002只￥10,560.00美国 klipsch 作为隐藏式音箱，KL-7800-THX 提供了终极听觉享受，既 秉承了剧院效果又融合了站立式音箱的优点。 02中置（入墙）KL-7800￥5,280.001只￥5,280.00美国 klipsch 作为隐藏式音箱，KL-7800-THX 提供了终极听觉享受，既 秉承了剧院效果又融合了站立式音箱的优点。 03侧环绕（吸顶、入墙）KS-7800￥4,380.002只￥8,760.00美国 klipsch Klipsch KS-7800-THX提供了终极环绕声的表现而且采用了平齐式安装设计，KS7800被设计为替家庭影院带来新高 度的全新产品。 影视厅3D全景声7.2.4影音系统配置方案（表五） 小计A
真正的杜比全景声
真正的杜比全景声（Dolby Atmos）影院 唯妙音响 纵观影音发展历史，世界上第一部有声电影诞生于1927年，美国电影《爵士歌王》首次添加入声音对白，当时是最原始的单声道混音技术（Mono）；到1939年，迪斯尼动画片《幻想曲》采用了多音轨录制和多声道回放技术，标志着电影从此进入了立体声（Stereo）时代；其后是5.1、7.1环绕声时代的到来；当2012年4月杜比实验室推出了杜比全景声（DolbyAtmos）后，众人声称：一场全新的娱乐音频体验革命正式开始。
然而，就在杜比全景声（Dolby Atmos）这一为电影观众带来身临其境观影体验的突破性影院音频系统时，我们又开始想象将其应用到家庭影院系统中，音效能够得到多大的提升。 近日，Pioneer、Onkoy、Denon和Marantz等许多家用音响品牌先后宣布推出支持杜比全景声（DolbyAtmos）技术的AV放大器，这说明了杜比全景声（DolbyAtmos）正逐渐走向民用化，其进入家庭影院已经处于倒计时阶段。 将杜比全景声（Dolby Atmos）体验带入家庭 大家或许会发现，在商业电影院中最新应用的技术，已经可以很快地进入到我们的家庭之中，成为我们家庭影院系统的新亮点。无论是3D、4K等等产品，专业影音技术的民用化速度已经越来越快，近期大众热议的杜比全景声（DolbyAtmos）技术也自然包括在内。 实际上，杜比的专业技术研发和家庭影院技术团队很早就开始了杜比全景声（DolbyAtmos）家用化的工作，力求把家庭影院的环绕声音效提至更高的层次，同时让音频发烧友能够灵活选择系统的组建方式。 目前我们获取到的最新支持Dolby Atmos的设备名单，都是AV放大器品牌的最新型号，其中包括了Pioneer、Onkoy、Denon和Marantz，其中有部分品牌会向现有已经上市的型号提供新的支持DolbyAtmos的固件升级服务。Pioneer已经确定把今年的2014款Elite SC功放加入Dolby Atmos功能，另外Onkyo也将推出多款新型号，例如TX-NR3030和TX-NR3030，而Marantz也会推出SR7009和AV7702这些新型号，Denon也不甘示弱地推出了AVR-X4100W和AVR-X5200。 全新的杜比全景声（Dolby Atmos）家庭体验为用户提供了标准的配置方案： 最佳的方式当然就是在天花板上安装扬声器，并且按照Dolby Atmos的规范进行连接；完全符合蓝光规格的现有播放器将能够支持蓝光
DolbyAtmos商业影院扬声器安装攻略
Dolby Atmos商业影院扬声器安装攻略 Dolby Atmos是新一代的电影音频技术，对电影音频体验的提升具有革命性的意义。本文对Dolby Atmos影院扬声器位置布局给出了指导意见，为影院规划提供了快速设计参考，帮助影院决定扬声器理想的安装位置，以获得高品质的Dolby Atmos回放。 一、银幕扬声器 1.1 摆放和高度 中置扬声器应总是放在银幕的中线上，而不考虑银幕具体位于影厅的哪个位置。在传统影院中，左侧的银幕扬声器和右侧的银幕扬声器均应摆放在1. 85：1（宽银幕）和2.39：1（变形宽银幕）图像之间的位置。对于银幕宽度超过12米的影厅，增加两只银幕扬声器将帮助获得跨越整个银幕的更流畅的声音移动效果。增加两只扬声器之后，应将左中扬声器（Lc）和右中扬声器（Rc）分别摆放在中置扬声器与左侧银幕扬声器和右侧银幕扬声器之间。同时推荐在以上各位置使用相同的扬声器。 在画面高度不变的传统影厅，应竖直摆放银幕扬声器，并将扬声器的声学中心高度置于银幕高度的2/3左右。 各扬声器的声学中心会因设计类型不同而异，但通常，两分频银幕扬声器的声学中心位于其号角的中点，三分频银幕扬声器的声学中心则位于中频和高频号角之问。 在画面宽度不变且带有顶部可移动式遮幅的影厅，应将左侧和右侧的银幕扬声器摆放在画面内侧的边缘。由于画面高度可变，不得不在垂直位置上做些妥协。杜比建议将声学中心设置在宽银幕画面（1. 85：1）高度的2/3处和变形宽银幕画面（2. 39：1）高度的2/3处连线距离的中心位置。 1. 2 朝向 银幕扬声器应在水平方向上旋转以使扬声器的中轴能够指向位于影厅长度2/3处（以银幕为起点）与画面中线相交的位置。对于安装在杖板墙上的扬声器，仅旋转扬声器的号角，低音单元依旧与杖板墙相平。 银幕扬声器号角的朝向应能够实现最优的观众席声音覆盖范围。有许多因素可对声音覆盖范围产生影响，包括扬声器的垂直散射特性和高度，影厅的长度和观众席的坡度。影院需要参考扬声器厂商的产品说明来设定扬声器的向下高度角，以便影厅获得最优的声音覆盖范围。 1.3 银幕低音扬声器 用于播放低频效果（LFE）的低音扬声器应安装在银幕后的地面与后墙相接的位置上，或齐平地嵌入银幕墙。使用多个低音扬声器时，杜比建议将其放在一起，通过耦合效应增强声音效果。不要沿着影厅的中线对称摆放低音扬声器，以避免产生驻波（房间的低频共鸣）。