Dolby audio and video Media file list

这篇说说车载数码音源。

音响效果的好坏跟音箱，功放，音源，线材等关系缺一不可。音源不好天价的HI-end音箱也发挥不出最佳效果。

声道测试音源

立体声:立体声是左右独立的两个声道，是声道，不是喇叭。每个声道可能是一个喇叭，也可能是很多喇叭。 比如车上，大多数车都是6只喇叭，前门四只喇叭，有两只高音、两只中低音。 后门有两只同轴喇叭。 而前门的四只喇叭左边的一只高音和一只中低音是同一声道，也就是左声道，是两分频喇叭。右边同理。 左后门跟左前门也是同一声道，如果是环绕声系统的话，就是两个独立声道。

如果原车是立体声系统，左前门和左后门的所有喇叭都是左声道，右前门和右后门的所有喇叭都是右声道。这就是标准的2声道系统。绝大部分原车都是这种系统。
环绕声:4声道（含）及以上称之为环绕声。DVD、蓝光时代的5.1-7.1环绕声可以提供前后左右的声场定位;
全景声:在环绕声基础上增加天空声道即为全景声。有天空声道代表全景声.。5.1.x-7.1.x则可以提供前后上(下)左右的三维声场。

注：天空声道的数量在第二个小数点后，5.1.2代表2个天空声道，5.1.4代表4个天空声道


环绕声

5.1 声道
相对于2声道的立体声，多少声道可以称之为环绕声呢？
答案是4声道

最早出现的环绕音轨就是4声道，左前置FR、右前置FL、左环绕SL、右环绕SR，就足以让声场包围听众。
5.1 环绕声通过五个扬声器和一个超低音音箱提供影院体验。
“5.1” indicates that it has five main (full audio spectrum) channels and one low-frequency enhancement (LFE) channel. The 5.1 system is widely used in home theaters.



Note: The subwoofer (used for playing the LFE channel) can be placed anywhere.
杜比全景声 (Dolby Atmos) 或环绕声5.1 扬声器布置
https://www.dolby.com/cn/zh/guide/speaker-setup/index.html

左前置FL、右前置RL、左环绕SL、右环绕SR，中置声道C再加上LEF低频通道，就组成了最常见的5.1环绕声系统。中置声道承担了80%的人声对白，而左右声道则承担较多的场景音效和BGM，前置三声道对于声音质感起着决定性作用，其表现会很大程度地影响使用者对整套音响的印象。而环绕音箱则主要提供让听者置身其中的包围感，以及从画面后方传来的声音，实现精确定位。


在第一个小数点后面是LFE声道，LFE（Low-frequency effects）声道并不是为了动次打次的低频效果，而是为了传递近乎听不到的次音频震动给身体，产生另一种感觉。所以真正的LFE声道不是为了出声，而是为了震撼人心，所以烧友们的低音炮10寸起，12寸常见，15寸不嫌大，功率150W起，为了均衡还要两个，这就成了音箱摆位中的x.2.x。

绝大多数低音炮自带功率放大器，可独立调节音量和相位等，使用音频线与功放连接（俗称炮线）。
现实中，低音炮不止还原LFE声道信号，如果主声道音箱不是全频带，就会有其他声道的低频信号通过低音炮重放，这取决于功放设置的截止频率（或通过设置其他音箱的尺寸是大还是小）。

除了低音炮，还有一类专门还原LFE信号的设备，叫低频振动器BASS Shaker，不出声只管震屁股。


这东西与低音炮功放板组合，装在沙发下面，借AVBUZZ一张图：



5.1.2声道
最容易实现的全景声音箱布局：5.1.2
天空声道，作为杜比全景声和DTS:X新增的垂直声道，如果没有那等于是依然停留在蓝光时代，用天花板反射实现天空声道并不算太困难，在装修时采用吊顶内装喇叭也是可以提前考虑的。

杜比全景声 (Dolby Atmos) 5.1.2 扬声器布置
https://www.dolby.com/cn/zh/guide/dolby-atmos-speaker-setup/5-1-2-setups.html

5.1.4声道



7.1声道-环绕声


https://www.dolby.com/cn/zh/guide/surround-sound-speaker-setup/7-1-setup.html


7.1.2声道




杜比全景声 (Dolby Atmos) 7.1.2 扬声器布置
https://www.dolby.com/cn/zh/guide/dolby-atmos-speaker-setup/7-1-2-setups.html

7.1.4声道


The Dolby Atmos system pictured here includes 12 speakers in a 7.1.4 speaker configuration

杜比全景声 (Dolby Atmos) 7.1.4 扬声器布置

https://www.dolby.com/cn/zh/guide/dolby-atmos-speaker-setup/7-1-4-setups.html


9.1 扬声器布置

https://www.dolby.com/cn/zh/guide/surround-sound-speaker-setup/9-1-setup.html


杜比全景声 (Dolby Atmos) 9.1.2 扬声器布置
https://www.dolby.com/cn/zh/guide/dolby-atmos-speaker-setup/9-1-2-setups.html

杜比全景声 (Dolby Atmos) 9.1.6 扬声器布置



1.杜比全景声有两种音轨，基于EAC3（DD+、DD plus）的和基于TrueHD

2.源码输出正确的英文是passThrough，直通/透传。windows可以通过HDMI连接读取电视或功放或回音壁的EDID，了解它支持什么格式的编码，然后只需开启播放软件的HDMI直通就行了，比如powerDVD设置音频输出为HDMI源码，VLC设置HDMI直通等等，









DTS:X Call Out 7.1.4

[img]https://pic4.zhimg.com/80/v2-e

The format is "x.y.z" where:

"x" is the number of channels or speakers at or near ear level,
"y" is the number of channels or speakers dedicated to low bass reproduction
"z" is the number of overhead channels or speakers.
If a system does not have any dedicated height channels, then the last digit is left off.  Here are some examples:

1.0 - this is a monophonic sound system with just one speaker reproducing all of the sound.
2.0 - this is a standard "stereo system" - it has two speakers to reproduce a stereo soundfield
2.1 - this represents a standard stereo system, but it adds a dedicated speaker for low bass reproduction (a woofer or subwoofer)
3.0 - this is similar to a stereo system, but it adds a dedicated center speaker between the front left and right speakers. This can help in reproducing movie dialog and commentary clearly.
3.1 - as above, but with a dedicated bass speaker (subwoofer).
4.0 - A typical 4.0-channel system uses two speakers in the front and two in the rear or side to reproduce surround sound. But a system with 3 speakers in the front (left, center, right) and one in the rear of the room could also qualify as 4.0
4.1 - as above, but with a dedicated bass speaker
5.0 - this is typically used to describe a traditional surround sound system with three speakers across the front (front left, center and front right) and two speakers on the sides or in the rear to generate surround sound
5.1 - as above, but with a dedicated bass channel or subwoofer
7.0 - this type of system has three speakers in the front, 2 on the side (side surround) and 2 in the rear (rear surround)
7.1 - as above, but with a dedicated bass channel or speaker
5.1.2 - this is a "standard" 5.1-channel surround sound system, with the addition of two height channel or speakers that generate sound from above the listener
5.1.4 - as above but with 4 height channels or speakers to generate sound above the listener
7.1.2 - a standard 7.1-channel system with two additional speakers dedicated to reproducing sound above the listener
7.1.4 - as above, but with 4 height channels or speakers

This series of 3 numbers can be used to describe the number and type of channels in any sound system, from a simple soundbar to an advanced A/V receiver to a professional movie theater surround sound system.

Understanding the Channels Used by Surround Formats

Surround Format  Channels used  
Quadraphonic       L - R - Ls - Rs
LCRS (Pro Logic)  L - C - R - S
5.1 (ITU 775)         L - C - R - Ls - Rs - LFE
6.1 (ES/EX)           L - C - R - Ls - S - Rs - LFE
7.1 (3/4.1)              L - C - R - Lm - Rm - Ls - Rs - LFE
7.1 (SDDS)            L - Lc - C - Rc - R - Ls - Rs - LFE

L = (Front) Left

Lc = Left Center

C = Center

Rc = Right Center

R = (Front) Right

Lm = Left Mid

Rm = Right Mid

Ls = Left Surround (Rear Left)

S = Surround (Rear Center)

Rs = Right Surround (Rear Right)

LFE = Low Frequency Effects

11.1.4

家用杜比全景声标准的34声道
https://mp.weixin.qq.com/s/bLatQJwgERxvH-f1xiMR1Q

7.1 audio streaming:

沦陷系列都很好看  9.0以上
《b宫沦陷》《冰海陷落》《天使沦陷》《伦敦沦陷》《莫斯科沦陷》