Lucasfilm THX: Home THX Speakers

Home THX Speakers

家用THX音箱

For the past 40 years, loudspeaker manufacturers have been refining their speaker designs for excellent two channel sound reproduction. However, movie soundtracks and TV broadcasts are delivered in multi-channel sound. In the future, record companies will undoubtedly employ multi-channel sound for more accurate and realistic music reproduction as well.
Let's look at performance enhancements we needed to make in speaker systems to reproduce multi-channel movie sound more accurately. The first is dialogue intelligibility. This can be difficult to accomplish because dialogue in a film competes with music and sound effects. In addition, all of these sounds are coming at you from many different directions. Clearly, the best way to hear clean dialogue is to reproduce it with as little coloration as possible. This means you need to hear flat frequency response all across the listening area and have minimal speaker/room interaction.

在过去40年里，各个厂商已经在双声道音箱设计方面精益求精。然而电影和电视的多声道的，将来，音乐也将由多声道来更真实的回放。
让我们看看为了更正确回放电影的多声道音轨，音箱系统需要作什么改进。首先需要改进的是对白的清晰度。各个方向上的电影音乐和音效往往会盖住对白。清晰回放对白的要求就是尽量避免音染色。这就是说在所有的听音区域有平滑的频率响应，听音室对系统的音染色要最小。

Front Channel Loudspeakers

Front channel imaging is also extremely important. For films, the sound has to match the picture perfectly. Conventional two channel speaker designs are constructed to present a good solid image over a 45 to 60 degree angle. Spread the speakers too far apart, and you get a hole in the center image. Place them too close together, and the sound stage collapses into a fuzzy mono sound. In a multi-channel sound system, sound images are formed between Left and Center and Right and Center Speakers. This means that speakers must be precise enough in their imaging characteristics to create a sound stage over half the separation distance normally expected for a two channel system.
Home THX LCR front channel speakers improve their dialogue intelligibility and imaging in two ways. The first way is to provide wide horizontal dispersion. This allows for people sitting off-axis to hear full and flat frequency response.
The second technique is to control the speakers' vertical dispersion. Acousticians have found that the ceiling a floor reflections are very destructive to a speaker's ability to image. In addition, the coloration from these vertical reflections cloud intelligibility.

前方音箱

前方声道的声像是特别重要的，因为电影要求声音和画面定位一致。一般双声道音箱设计为可以回放45-60度的声像。两个音箱之间距离过大，中间会有声像的空洞。两个音箱太接近，效果会象失真的单声道。在多通道系统中，声像是在左声道和中置声道及右声道和中置声道之间形成的。这就是说音箱必须在普通双声道音箱一半的间距上精确再现声像。

家用THX左中右音箱从两个方面改善对白的清晰度。一项技术就是提供宽的水平指向性，使即使偏离听音中轴的区域，也可以保持完全的平滑的频率响应。

另一项技术就是控制音箱的垂直指向性。声学研究发现天花和地板的反射对声像的破坏很大，垂直方向的反射影响了声音的可理解性。

Surround Channel Loudspeakers

The purpose of a surround channel is to surround you with sound. The problem is that this is tough to do with just two speakers. Decorrelation takes care of Left/Right spaciousness, but what about wrap around envelopment? If a director chooses to place you in a wind storm, conventional speakers leave you with the impression that you're hearing the windstorm through two open windows.
The Home THX Diffuse Surround Speaker is designed to provide you with a "movie without walls" experience. It does this by painting the walls and the ceiling with sound. It sends very little sound towards the listener. The sound reflecting off the rooms walls and ceiling provides you with an enveloping soundfield, immersing you in the movie experience.
The total energy radiated by a speaker in all directions is called its "Power Response". The Home THX Diffuse Surround Speaker is required to have a flat power response. This means that the total energy radiated by the speaker (in front, above, below, behind, and to the sides) must average together into a flat frequency response. With the total speaker energy being flat, a listener anywhere within the surround speaker's null area will hear flat frequency response.

环绕音箱

环绕声道的目的就是把你包围在声音之中。问题是仅使用两个音箱就太勉强了。去相关保证左右之间的规模，但如何营造包围感？如果导演把你放在暴风雨中，普通音箱给你的感觉就象是通过两个打开的窗户去听暴风雨。

家用THX扩散环绕音箱提供电影的室外感受。设计用天花和墙壁来反射声音，避免直接对聆听者的声音，从而产生一个包围聆听者的声场，使聆听者身临其境。

THX扩散环绕音箱要有能力往空间里平均的扩散能量。这意味着音箱往所有方向上辐射的声音都要平均并有平滑的频率响应。最终使环绕音箱的零区域里任何地方都可以有平滑的频率响应。

Subwoofer Loudspeakers

The final step in accurate multi-channel sound reproduction is for accurate deep bass response. Home THX Subwoofers can come in a variety of designs:

Single Cabinet Un-amplified
Single Cabinet Amplified
Dual Cabinet Un-amplified
Dual Cabinet Amplified

All subwoofers are designed to match THX LCR speakers through the Electronic Crossover in a Home THX Controller. THX Subwoofers must have an in-room flat frequency response down to 20 Hz and approved systems must be able to play to beyond 105 dB sound pressure level without distortion.

重低音音箱
精确的多通道系统还要有精确的低频下潜。为此，家用THX重低音音箱可能采用以下几种设计：

单件无源音箱

单件有源音箱

双件无源音箱

双件有源音箱

所有的重低音音箱设计都和家用THX控制器的电子分频相适应。THX重低音音箱要求整个房间里，低频平滑下潜至20Hz，并且能够不失真地回放105dB的声压。

Home THX Program:

Overview
5.1 Reasons Why THX Makes 5.1 Best
THX Ultra and THX Select
The Home THX Controller
Home THX Speakers
Home THX Amplifiers, Equalizers and Interconnects
Home THX FAQ
DVD Player Certification
Home THX Product Database
Licensee Listings

Back to THX Consumer Products

m17design.myetang.com
m17译自www.thx.com
2002/01

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© 2002 Lucasfilm Ltd.

	Home THX Speakers		家用THX音箱
	For the past 40 years, loudspeaker manufacturers have been refining their speaker designs for excellent two channel sound reproduction. However, movie soundtracks and TV broadcasts are delivered in multi-channel sound. In the future, record companies will undoubtedly employ multi-channel sound for more accurate and realistic music reproduction as well. Let's look at performance enhancements we needed to make in speaker systems to reproduce multi-channel movie sound more accurately. The first is dialogue intelligibility. This can be difficult to accomplish because dialogue in a film competes with music and sound effects. In addition, all of these sounds are coming at you from many different directions. Clearly, the best way to hear clean dialogue is to reproduce it with as little coloration as possible. This means you need to hear flat frequency response all across the listening area and have minimal speaker/room interaction.		在过去40年里，各个厂商已经在双声道音箱设计方面精益求精。然而电影和电视的多声道的，将来，音乐也将由多声道来更真实的回放。让我们看看为了更正确回放电影的多声道音轨，音箱系统需要作什么改进。首先需要改进的是对白的清晰度。各个方向上的电影音乐和音效往往会盖住对白。清晰回放对白的要求就是尽量避免音染色。这就是说在所有的听音区域有平滑的频率响应，听音室对系统的音染色要最小。
	Front Channel Loudspeakers Front channel imaging is also extremely important. For films, the sound has to match the picture perfectly. Conventional two channel speaker designs are constructed to present a good solid image over a 45 to 60 degree angle. Spread the speakers too far apart, and you get a hole in the center image. Place them too close together, and the sound stage collapses into a fuzzy mono sound. In a multi-channel sound system, sound images are formed between Left and Center and Right and Center Speakers. This means that speakers must be precise enough in their imaging characteristics to create a sound stage over half the separation distance normally expected for a two channel system. Home THX LCR front channel speakers improve their dialogue intelligibility and imaging in two ways. The first way is to provide wide horizontal dispersion. This allows for people sitting off-axis to hear full and flat frequency response. The second technique is to control the speakers' vertical dispersion. Acousticians have found that the ceiling a floor reflections are very destructive to a speaker's ability to image. In addition, the coloration from these vertical reflections cloud intelligibility.		前方音箱前方声道的声像是特别重要的，因为电影要求声音和画面定位一致。一般双声道音箱设计为可以回放45-60度的声像。两个音箱之间距离过大，中间会有声像的空洞。两个音箱太接近，效果会象失真的单声道。在多通道系统中，声像是在左声道和中置声道及右声道和中置声道之间形成的。这就是说音箱必须在普通双声道音箱一半的间距上精确再现声像。家用THX左中右音箱从两个方面改善对白的清晰度。一项技术就是提供宽的水平指向性，使即使偏离听音中轴的区域，也可以保持完全的平滑的频率响应。另一项技术就是控制音箱的垂直指向性。声学研究发现天花和地板的反射对声像的破坏很大，垂直方向的反射影响了声音的可理解性。
	Surround Channel Loudspeakers The purpose of a surround channel is to surround you with sound. The problem is that this is tough to do with just two speakers. Decorrelation takes care of Left/Right spaciousness, but what about wrap around envelopment? If a director chooses to place you in a wind storm, conventional speakers leave you with the impression that you're hearing the windstorm through two open windows. The Home THX Diffuse Surround Speaker is designed to provide you with a "movie without walls" experience. It does this by painting the walls and the ceiling with sound. It sends very little sound towards the listener. The sound reflecting off the rooms walls and ceiling provides you with an enveloping soundfield, immersing you in the movie experience. The total energy radiated by a speaker in all directions is called its "Power Response". The Home THX Diffuse Surround Speaker is required to have a flat power response. This means that the total energy radiated by the speaker (in front, above, below, behind, and to the sides) must average together into a flat frequency response. With the total speaker energy being flat, a listener anywhere within the surround speaker's null area will hear flat frequency response.		环绕音箱环绕声道的目的就是把你包围在声音之中。问题是仅使用两个音箱就太勉强了。去相关保证左右之间的规模，但如何营造包围感？如果导演把你放在暴风雨中，普通音箱给你的感觉就象是通过两个打开的窗户去听暴风雨。家用THX扩散环绕音箱提供电影的室外感受。设计用天花和墙壁来反射声音，避免直接对聆听者的声音，从而产生一个包围聆听者的声场，使聆听者身临其境。 THX扩散环绕音箱要有能力往空间里平均的扩散能量。这意味着音箱往所有方向上辐射的声音都要平均并有平滑的频率响应。最终使环绕音箱的零区域里任何地方都可以有平滑的频率响应。
	Subwoofer Loudspeakers The final step in accurate multi-channel sound reproduction is for accurate deep bass response. Home THX Subwoofers can come in a variety of designs: Single Cabinet Un-amplified Single Cabinet Amplified Dual Cabinet Un-amplified Dual Cabinet Amplified All subwoofers are designed to match THX LCR speakers through the Electronic Crossover in a Home THX Controller. THX Subwoofers must have an in-room flat frequency response down to 20 Hz and approved systems must be able to play to beyond 105 dB sound pressure level without distortion.		重低音音箱精确的多通道系统还要有精确的低频下潜。为此，家用THX重低音音箱可能采用以下几种设计：单件无源音箱单件有源音箱双件无源音箱双件有源音箱所有的重低音音箱设计都和家用THX控制器的电子分频相适应。THX重低音音箱要求整个房间里，低频平滑下潜至20Hz，并且能够不失真地回放105dB的声压。
	Home THX Program: Overview 5.1 Reasons Why THX Makes 5.1 Best THX Ultra and THX Select The Home THX Controller Home THX Speakers Home THX Amplifiers, Equalizers and Interconnects Home THX FAQ DVD Player Certification Home THX Product Database Licensee Listings Back to THX Consumer Products		m17design.myetang.com m17译自www.thx.com 2002/01