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主题:[原创]耳机设计中,不同换能器的组合设计

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  发帖心情 Post By:2015-10-31 20:40:38 [显示全部帖子]

挡不住的世界顶级高音,藏不住的震撼!香港嘉圣德最近推出了其最新出品的黑金系列气动式(海尔式)Air Motion Transformer汽车高音头,纯手工打造做工精致的气动式高音头可以适合任何车系加装或改装,一点也不影响原车风格,更让人震撼的是放出的高音效果恰似在现场享受高保真音乐。气动式汽车高音头设计难度大,高音最大直径仅40mm,高频延伸到惊人的40KHz,绝非一般球顶高音可比,嘉圣德在声音领域和汽车音响领域的这一创造性突破,用专业发烧友的耳朵来打造全球首款气动式高音头,将给汽车音响带来全新的体检。嘉圣德用专业发烧友的耳朵来为普通大众打造恰似专业电影院的高音效果,高频表现上具有更加清晰的解析力,让声音原始、深厚、纯净,欣赏音乐效果显著,美国汽车音响著名评测师Darek Spring博士评测到 “这款气动式高音头能听出小提琴的松香味。”目前,这一汽车高音头正在申请多项国家专利。 




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  发帖心情 Post By:2015-10-31 20:40:55 [显示全部帖子]

看来是好东西


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  发帖心情 Post By:2015-10-31 20:41:41 [显示全部帖子]

自1973年美国的海尔博士(Oscar Heil)发明了一种非常特殊的扬声器声波辐射方式---AMT(Air Motion Transformer)气动式换能器,即气动式扬声器后,嘉圣德公司已经成为高音单元制造领域的先驱者之一。德国留学归国后的Theme博士对嘉圣德公司的指导原则不是以技术第一位,而是更注重能使客户受益的技术以及提供更高的声音品质,以确保放音质量尽可能的真实准确。


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  发帖心情 Post By:2015-10-31 20:44:28 [显示全部帖子]

海尔扬声器制作工艺复杂,价格高昂,难以普及,只在国外少数著名的大品牌公司的高端产品中看到,如德国ELAC(意力)的Jet气动式高音,香港AudioPur(嘉圣德),ADAM(亚当)的ART气动式高音,Burmester(柏林之声),丹麦GRYPHONG(贵丰),美国Mark Daniel(马克丹尼)。
气动式式的高音振膜位于均匀的磁场当中,它的振膜受力远比球顶振膜均匀,不会产生分割振动,在高频表现上具有更加清晰的解析力。
气动式高音比传统顶级金属球顶高音反应速度快,能够反应出音乐中丰富的细节.特别打击乐中的金属声,它没有金属球顶高频的刺耳声,清脆而不干涩。



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  发帖心情 Post By:2015-10-31 20:47:58 [显示全部帖子]

The Air Motion Transformer (AMT) is a type of electroacoustic transducer or loudspeaker, also called Air Velocity Transformer (AVT) or JET transducer. Invented by Dr. Oskar Heil, it operates on a different transduction principle than other loudspeaker designs, such as moving coilplanar magnetic or electrostatically driven loudspeakers, and should not be confused with planar or true ribbon loudspeakers. In contrast to a planar ribbon loudspeaker the diaphragm of the AMT is of pleated shape similar to a bellows. The AMT moves air in an augmented, semi-perpendicular motion using a folded sheet (made of polyethylene, polyester or polyimide), structured around a series of aluminum struts positioned in a high-intensity magnetic field.

The diaphragm pushes back and forward from itself in a physical motion similar to that observed when an accordion is pushed in and pulled out to pump air though the reed chambers, albeit over an exceedingly smaller motion range.

The result is a dipole driver with an extraordinarily rapid response rate, enabled by the extremely low mass of the polyester driver and the far smaller distance it travels on each “swing” compared to a dynamic driver. In this technical respect, it shares characteristics with the electrostatic driver.

The discernible motion of each diaphragm flexure is very small, but because of the folded structure, more air is moved than would be by a conventional cone or electrostatic driver of the same plotted surface area. As a matter of surface comparison, a standard 1-inch-wide (25 mm) AMT strip has a functional driver area comparable to an 8-inch-diameter (200 mm) circular dynamic cone. The folded driver design, combined with the small motion range, means the AMT acts like a point source version of a larger driver, inherently resulting in lower sound reproduction distortion. As a result of its motion pattern, the AMT "spits" the air out in a way similar to the action of shooting a watermelon seed from your hand by squeezing it between thumb and forefinger. The speed of the air as it leaves the diaphragm is approximately five times faster than the speed of the actual driver structure, hence the name, Air Motion Transformer.

Although it is possible to operate the diaphragm without the magnetic field, using piezoelectric technology, this method has been used only by TakeT for their headphone and tweeter products.

There are a couple of companies producing Heil AMTs:
Dayton Audio (USA)
EmotivaPro (USA) under the name Airmotiv
MartinLogan (USA) under the name Folded Motion Tweeter[3]
Precide (Switzerland) who calls their version the AVT (Air Velocity Transformer). Precide uses an AMT driver for their top of the line headphones.
ELAC (Germany) who calls their version of the transducer JET
ADAM (Germany), under the name Accelerating Ribbon Technology[4]
ETON (Germany)
Beyma (Spain)
Furuyama Audio Labs - FAL (Japan)
SoundTouch (China)国内有厂在做(嘉兴的)



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  发帖心情 Post By:2015-10-31 20:48:50 [显示全部帖子]

美国有专利:

Heil's "Air Motion Transformer" US patents[edit]

US#3,636,278 issued Jan 18, 1972.
(Describes the Heil AMT variations, some of which resemble the ELAC JET transducer) [1]
US#3,832,499 issued Aug. 2, 1974.
(Describes the Heil AMT embodiment used in the ESS AMT series) [2]
US#4,056,697 issued Nov 1, 1977.
Movable diaphragm connector method flexible hinge diaphragm surround and... [3]
US#4,039,044 issued Aug 2, 1977.
(Low-frequency AMT. The patent also describes the principle used by Tymphany for their LAT transducer including the embodiment type) [4]
US#4,107,479 Aug 15, 1978.
(Further refinements of the low-frequency AMT) [5]
US#4,160,883 Jul 10, 1979.
Acoustic transducer and method of making same [6]


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