杜比实验室于2012年4月推出的杜比全景声（Dolby Atmos）是全新的影院音频平台，彻底改变了娱乐音频体验。他通过更加自然真实的音效为电影观众带来强大的全新聆听体验，将观众真正包围其中。作为端对端解决方案，杜比全景声能够帮助混录师、电影公司和发行商极大地提升电影声音体验，让内容创造更加轻松地创造栩栩如生的声景，而无需考虑影院配置或扬声器数量。
Part1 Screen Loudspeakers
Dolby Atmos does not place new demands on the screen loudspeakers. Existing best practice still applies. The loudspeakers must be capable of full dynamic range digital cinema content playback through a cinema screen, with a response that conforms to ISO 2969:1987/SMPTE ST 202:2010 specifications.
To ensure this performance, the following specifications are provided.
杜比全景声并没有对屏幕扬声器提出新的要求，而是保持原先的要求。扬声器必须能够通过电影屏幕进行全动态范围的电影内容播放，需符合标准 ISO 2969:1987/SMPTE ST 202:2010 。
为确保影片效果，提出以下设计参考：
Number of Screen Loudspeakers
A minimum of three screen loudspeakers is required. For a screen wider than 12 meters (approximately 40 feet), we recommend the addition of left center and right center loudspeakers.
屏幕扬声器数量
左声道主扩扬声器、右声道主扩扬声器和中置声道主扩扬声器是必备的，若屏幕宽度大于12米时，我们建议配置左中和右中扬声器。
Sound Pressure Level: 105 dB
Each screen loudspeaker system and associated amplifiers must have a maximum output capability of 105 dB continuous sound pressure level (SPL) at the reference listening position (RLP), a point two-thirds of the distance to the rear wall of the auditorium in the middle of the seating area. Loudspeaker capability must be determined as described in Section 6. If the system specifications are not known or not provided by the manufacturer, use the following guidelines for SPL at the RLP to assess each component:
• Two-way/biamplifier: 105 dB for the low-frequency section, 101 dB for the middle-frequency and high-frequency sections.
• Three-way/triamplifier: 105 dB, 101 dB, 98 dB for the low-frequency, middle-frequency, and high-frequency sections, respectively.
• Four-way/quad amplifier: 105 dB, 101 dB, 98 dB, 92 dB for the low-frequency, middle-frequency, high-frequency, and ultra high-frequency sections, respectively.
When determining the SPL capability of a screen loudspeaker system or the low-frequency component, use half-space sensitivity if the loudspeaker is mounted in a baffle wall. We recommend an amplifier with 3 dB of headroom (that is, twice the required continuous power) to drive each element.
测试点最大声压级应为105dB
每个屏幕扬声器系统和相关大放大器在参考听音位置最大连续声压级至少应达到105dB，测试点位于距离后墙2/3处的影厅中线上。如果系统规格位置或由制造商提供，应遵循以下规格去评估每个构件：
·两分频银幕扬声器：低频单元为105dB，中高频单元为101dB；
·三分频银幕扬声器：低频单元为105dB，中频单元为101dB，高频单元为98dB；
·四分频银幕扬声器：低频单元为105dB，中频单元为101dB，高频单元为98dB,超高频单元为92dB。
在确定银幕扬声器系统或低频组件的声压级能力时，如果扬声器安装在墙上，请使用半空间灵敏度。我们推荐具有3dB余量（即所需连续功率的两倍）放大器来驱动每个元件。
文章来源：声讯网
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