STEREO ENHANCEMENT SYSTEM
    242.
    发明申请
    STEREO ENHANCEMENT SYSTEM 审中-公开
    立体声增强系统

    公开(公告)号:WO1987006090A1

    公开(公告)日:1987-10-08

    申请号:PCT/US1987000099

    申请日:1987-01-27

    CPC classification number: H04S7/30 H04R5/033 H04S1/00 H04S1/005 H04S7/307

    Abstract: A stereo enhancement system (300) which provides an enhanced wider stereo image and a wider listening area, and further provides perspective correction for achieving correct stereo sound perspective with speakers at different locations and with headphones. The stereo enhancement system includes a stereo image enhancement system (100, 10, 110) which includes circuitry (11, 13, 111, 113) for generating sum and difference signals based on left and right stereo signals, circuitry (17, 18, 19, 22, 30, 115, 125, 129, 40) for selectively altering the relative amplitudes of the difference signal components, circuitry (17, 21, 30, 117, 127, 40) for selectively altering the relative amplitudes of the sum signal components, and circuitry (23, 25, 27, 119, 121, 123) for combining the processed sum and difference signals with the original left and right stereo signals to produce enhanced left and right stereo signals. The enhancement system further includes a perspective correction system (200, 210) which is responsive to the enhanced left and right signals provided by the stereo image enhancement system or to left and right stereo signals of an audio system. The perspective correction system includes circuitry (211, 213) for generating sum and difference signals from the left and right stereo signals, equalization circuitry (215, 217, 221, 223) for providing fixed equalization for the sum and difference signals to compensate for the variation with direction of the frequency response of the human ear, and mixing circuitry (225) for combining the equalized sum and difference signals to produce left and right signals.

    AFOCAL BEAM EXPANSION APPARATUS AND METHOD
    243.
    发明申请
    AFOCAL BEAM EXPANSION APPARATUS AND METHOD 审中-公开
    AFOCAL BEAM扩展装置和方法

    公开(公告)号:WO1987006013A1

    公开(公告)日:1987-10-08

    申请号:PCT/US1987000361

    申请日:1987-02-24

    CPC classification number: G02B19/0023 G02B19/0033

    Abstract: An afocal beam expansion system and method which achieves the compactness of prior art refractive systems and yet avoids the use of refractive elements with their accompanying beam scattering, adsorption and temperature sensitivity. A pointing reflector (74) is positioned in the beam path between an expansion reflector (72) and a collimating reflector (76). The small diameter input beam is directed onto the expansion reflector (72), which causes it to diverge, reflects off the pointing reflector (74), and reaches the collimating reflector (76). The latter element collimates the beam and reflects it back to the pointing reflector (74), which points the beam along a desired output axis (78). The expansion, pointing and collimating reflectors are positioned relative to each other such that the beam axis is altered upon each reflection from each element. The pointing reflector (74) may be implemented as a plano mirror, or alternately may comprise a convex reflective surface that cooperates with the collimating mirror (76) to fully collimate the expanded beam. The invention is particularly applicable to airborne laser navigational radar terrain avoidance systems.

    EFFICIENT PHASE CONJUGATE LASER
    244.
    发明申请
    EFFICIENT PHASE CONJUGATE LASER 审中-公开
    有效的相位激光

    公开(公告)号:WO1987005751A1

    公开(公告)日:1987-09-24

    申请号:PCT/US1987000202

    申请日:1987-02-02

    CPC classification number: H01S3/2333 H01S3/10076

    Abstract: A laser apparatus (10) utilizing a master oscillator power amplifier configuration wherein a master oscillator (12) provides a source of low energy, high phase front quality, and high spectral purity radiation, injected into at least one lasing medium gain element (14) disposed along an optical path. Coupling means (16) is positioned to selectively couple a predetermined percentage of the master oscillator (12) radiation into the gain element (14) medium while preventing all but a predetermined percentage of any amplified radiation exiting the gain element (14) from re-entering the master oscillator (12). Phase conjugation means (20) is disposed along the optical path on the opposite side of the gain element (14) as the coupling means (16), for reflecting the phase conjugate of laser radiation incident thereon. Delay means positioned between the gain element (14) and the phase conjugation means (16) assures that radiation pulses coupled along the optical path traverse and substantially exit from the gain element (14), toward the phase conjugation means (20), before any reflected radiation from the phase conjugation means (20) enters the gain element (14).

    SYSTEM AND METHOD FOR ENCODING INFORMATION ONTO AN OPTICAL BEAM
    245.
    发明申请
    SYSTEM AND METHOD FOR ENCODING INFORMATION ONTO AN OPTICAL BEAM 审中-公开
    用于将信息编码到光束上的系统和方法

    公开(公告)号:WO1987005715A1

    公开(公告)日:1987-09-24

    申请号:PCT/US1987000292

    申请日:1987-02-12

    CPC classification number: G02F1/3538 G02F1/0541

    Abstract: A system and method for encoding information onto an optical beam in which a photorefractive material (18) is used to modulate the beam. An alternating electric field is applied to the photorefractive material (18) and modulated so as to vary the material's index ellipsoid via the electro-optic effect and hence modulate an output beam (20A) in accordance with the information to be encoded. The invention has applications to both externally pumped and self-pumped phase conjugate mirrors, and to other optical systems. Various modulation techniques can be used, and the modulation can be isolated from noisy beams by applying the modulating electric field on a high frequency carrier.

    VOLTAGE TUNABLE OPTICAL BEAM SWITCHING DEVICE
    246.
    发明申请
    VOLTAGE TUNABLE OPTICAL BEAM SWITCHING DEVICE 审中-公开
    电压可控光束开关器件

    公开(公告)号:WO1987005125A1

    公开(公告)日:1987-08-27

    申请号:PCT/US1987000105

    申请日:1987-01-15

    CPC classification number: G02F1/134309 G02F1/292

    Abstract: A liquid crystal electro-optical switching device utilizing a liquid crystal cell (10) wherein one electrode (5) has a grating pattern (11), and the other electrode is a planar layer. The device acts as a voltage tunable phase grating, whose grating strength is controlled by an external field applied to the electrodes. The switch provides one-dimensional 1 * N splitting with even outputs, and two-dimensional 1 * N switching in a crossed grating configuration.

    Abstract translation: 一种利用液晶单元(10)的液晶电光开关器件,其中一个电极(5)具有光栅图案(11),另一个电极是平面层。 该器件用作电压可调相位光栅,其光栅强度由施加到电极的外部场控制。 该开关提供具有均匀输出的一维1 * N分割,以及交叉光栅配置中的二维1 * N切换。

    SHAKER TABLE
    247.
    发明申请
    SHAKER TABLE 审中-公开

    公开(公告)号:WO1987004242A1

    公开(公告)日:1987-07-16

    申请号:PCT/US1986002702

    申请日:1986-12-16

    CPC classification number: G01M7/06

    Abstract: A shaker table (10) includes a table base (12) mounted upon isolating supports (32) and vibrated by vibrators (34, 36). The vibration is conveyed through and damped in a flexure member (16) comprising pairs (26, 28) of honeycomb layers (18, 20, 22, 24) joined and bonded together by sheets (42) utilizing beads of elastomeric adhesive which space the honeycomb layers apart. A segmented top plate (14) is secured to the topmost honeycomb layer and is divided into a plurality of sections or segments (68-82) for separate resonances. In this way, highly damped vibrational resonances of table top plate (14) are obtained.

    SIMPLIFIED GASEOUS DISCHARGE DEVICE SIMMERING CIRCUIT
    248.
    发明申请
    SIMPLIFIED GASEOUS DISCHARGE DEVICE SIMMERING CIRCUIT 审中-公开
    简化放电放电装置仿真电路

    公开(公告)号:WO1987004037A1

    公开(公告)日:1987-07-02

    申请号:PCT/US1986002507

    申请日:1986-11-24

    CPC classification number: H05B41/30 Y10S315/04 Y10S315/07

    Abstract: A high voltage active device such as a power FET is employed in a circuit configuration which maximizes the terminal impedance. This high impedance is placed in series with the gaseous discharge device to be driven. The gaseous discharge device is able to sustain conduction, between pulsed operations, at very low currents due to the very high impedance presented by the FET. A further refinement of the invention provides the supply voltage for the combination of the FET and the gaseous discharge device from a capacitor which can be charged during normal pulse-forming network charging.

    Abstract translation: 在电路配置中采用诸如功率FET的高电压有源器件,其使端子阻抗最大化。 该高阻抗与要驱动的气体放电装置串联放置。 气体放电装置能够在非常低的电流下在脉冲操作之间维持导通,这是由于FET提供的非常高的阻抗。 本发明的进一步改进为来自可在正常脉冲形成网络充电期间被充电的电容器提供FET和气体放电装置的组合的电源电压。

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