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公开(公告)号：US4782512A
公开(公告)日：1988-11-01
申请号：US941327
申请日：1986-12-15
申请人： Adrian P. Hutton
发明人： Adrian P. Hutton
摘要： The present invention provides an apparatus for selectively connecting one of a plurality of data units (21,22,23) (for example modems) to a telephone line (20). The apparatus comprises a plurality of interface circuits (24) each having a respective data unit connected thereto. Also connected to each interface unit, and thereby connecting the interface units together, is a common dialing device (28), a telephone line, a dial request bus and a line occupied bus. Each interface circuit has a dial connect switch and a line connect switch, a first switching means for connecting the telephone line to the common dialing device, on operation of the dial connect switch, and a second switching means for disconnecting the telephone line from the common dialing device and connecting the telephone line to a data unit on operation of the line connect switch. The interface circuit also includes processing means for supplying a dial request signal to the dial request bus, when the common dialing device is connected to the telephone line, and for supplying a line occupied signal to the line occupied bus when its respective data unit is connected to the telephone line.
摘要翻译： 本发明提供了一种用于选择性地将多个数据单元（21,22,23）（例如调制解调器）中的一个连接到电话线（20）的装置。 该装置包括多个接口电路（24），每个接口电路具有连接到其上的各自的数据单元。 还连接到每个接口单元，从而将接口单元连接在一起，是公共拨号设备（28），电话线，拨号请求总线和线路占用总线。 每个接口电路具有拨号连接开关和线路连接开关，用于在拨号连接开关的操作时将电话线连接到公共拨号装置的第一开关装置，以及用于将电话线与公共线路断开的第二切换装置 拨号设备，并且在线路连接交换机的操作中将电话线连接到数据单元。 接口电路还包括处理装置，用于当公共拨号设备连接到电话线时向拨号请求总线提供拨号请求信号，并且当其相应的数据单元连接时，向行占用总线提供线路占用信号 到电话线。
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公开(公告)号：US4771396A
公开(公告)日：1988-09-13
申请号：US711686
申请日：1985-03-14
申请人： Colin R. South , Alwyn V. Lewis
发明人： Colin R. South , Alwyn V. Lewis
CPC分类号： H03H21/0012 , H04B3/23 , H03H2021/0089 , H04B3/238
摘要： A transversal finite impulse response, adaptive digital filter comprises three stages (10, 11, 12). The stage (10) is a memory stage which stores input samples x and coefficients. The second stage (11) is an arithmetic stage which forms convolution products and accumulates the product to provide an output. The third stage (12) forms update values for updating the coefficients according to a predetermined algorithm. The stages are coupled by buses (14, 15) and data transfer between the stages via the buses is controlled by a control unit (18). The filter operates so that convolution products are formed during a first part of each sample period and update values are formed during a second part of each sample period for use in the subsequent sample period.
摘要翻译： 横向有限脉冲响应，自适应数字滤波器包括三个阶段（10,11,12）。 阶段（10）是存储输入样本x和系数的存储器级。 第二阶段（11）是一个运算阶段，它形成卷积产品并积累产品以提供产出。 第三级（12）形成根据预定算法更新系数的更新值。 这些级由总线（14,15）耦合，并且经由总线的级之间的数据传输由控制单元（18）控制。 滤波器操作使得在每个采样周期的第一部分期间形成卷积积，并且在每个采样周期的第二部分期间形成更新值以用于随后的采样周期。
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公开(公告)号：US4767210A
公开(公告)日：1988-08-30
申请号：US23906
申请日：1987-03-10
申请人： Raman Kashyap
发明人： Raman Kashyap
CPC分类号： G01J9/02 , G01H9/004 , H01S3/1392 , G01J2009/0226
摘要： An optical fibre Michelson interferometer has mirrors of highly reflective coatings deposited on the ends of the fibres forming the free arms of the interferometer. The interferometer preferably comprises single mode fibres, and is operated by a frequency swept laser.The interferometer has applications in the optical fibre interferometer sensing field.
摘要翻译： 光纤迈克尔逊干涉仪具有沉积在形成干涉仪的自由臂的纤维端部上的高反射涂层的反射镜。 干涉仪优选地包括单模光纤，并且由扫频激光器操作。 干涉仪在光纤干涉仪感应领域有应用。
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公开(公告)号：US4748632A
公开(公告)日：1988-05-31
申请号：US548480
申请日：1983-11-03
申请人： Keith R. Preston
发明人： Keith R. Preston
CPC分类号： H01S5/14 , H01S3/1398 , H01S5/06837
摘要： A method and apparatus for controlling an external cavity of a semiconductor laser to maintain its emission in a single longitudinal mode. The length of the external cavity is varied by an electromagnet acting on ferromagnetic material attached to a copper foil reflector. Total optical power output of the laser is monitored and single longitudinal mode operation is achieved by maximizing the power output. An active technique employs modulation of the reflector position about a mean value. The magnetic manipulation of the reflector may find application in other laser systems, e.g. gas lasers.
摘要翻译： 一种用于控制半导体激光器的外部空腔以将其发射保持在单个纵向模式的方法和装置。 外部空腔的长度由作用在附着在铜箔反射器上的铁磁材料上的电磁体变化。 监测激光的总光功率输出，并通过最大化功率输出实现单纵模运行。 主动技术采用反射器位置关于平均值的调制。 反射器的磁操作可以应用于其他激光系统，例如， 气体激光器。
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公开(公告)号：USD295409S
公开(公告)日：1988-04-26
申请号：US731227
申请日：1985-05-07
申请人： Michael Drew , Peter Ford
设计人： Michael Drew , Peter Ford
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公开(公告)号：US4672759A
公开(公告)日：1987-06-16
申请号：US838433
申请日：1986-03-10
申请人： Brian Docherty , Stephen Lambley
发明人： Brian Docherty , Stephen Lambley
CPC分类号： G09F9/302
摘要： Digits of a multi digit alphanumeric display have eight segments, viz a conventional seven segment arrangement plus an eighth. The attitude/position of the eighth segment differs from digit to digit, the pattern of variation being selected so that a limited repertoire of words and phrases can be displayed without the provision of full alphanumeric capability on all digits.
摘要翻译： 多位数字字母数字显示的数字有八个段，即传统的七段排列加八分。 第八段的姿态/位置不同于数位，所选择的变化模式使得可以显示有限的单词和短语集合，而无需在所有数字上提供完整的字母数字能力。
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公开(公告)号：US4665524A
公开(公告)日：1987-05-12
申请号：US737451
申请日：1985-05-24
申请人： David Cotter
发明人： David Cotter
IPC分类号： H01S3/098
CPC分类号： H01S3/1109 , H01S3/1068 , H01S3/136
摘要： A mode-locked laser light source, i.e. a light source in which resonant longitudinal modes of the laser cavity are synchronized in phase to produce a pulsed laser output, is provided with an optical phase-lock loop, to lock the optical output pulse train to the mode-locking radio frequency drive signal. The invention provides a highly stable laser source for light pulses of picoseconds duration.
摘要翻译： 模式锁定激光光源，即其中激光腔的谐振纵向模式同相同步以产生脉冲激光输出的光源，设置有光学锁相环，以将光输出脉冲串锁定到 模式锁定射频信号。 本发明为皮秒持续时间的光脉冲提供了高度稳定的激光源。
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公开(公告)号：US4664743A
公开(公告)日：1987-05-12
申请号：US672231
申请日：1984-11-16
申请人： Rodney H. Moss , Paul C. Spurdens
发明人： Rodney H. Moss , Paul C. Spurdens
IPC分类号： C23C16/458 , C30B25/08 , C30B25/14 , C30B25/12 , C23C28/00
CPC分类号： C30B25/14 , C23C16/4588 , C30B25/08 , Y10S148/025 , Y10S438/935
摘要： A method for the growth of a semi-conductor material on a substrate by vapour phase epitaxy, comprises establishing a gas flow in each of a plurality of ducts, and moving the substrate, in a single plane of movement, from one duct to another. Suitable apparatus for use in the method comprises a plurality of ducts; apparatus for establishing a gas flow along each duct; a substrate support member, on which there may be a groove for the location of a substrate; and apparatus for moving, e.g. rotating, the support member. In use, the substrate is exposed sequentially to at least two of the gas flows, e.g. to grow GaInAs on InP.
摘要翻译： 一种用于通过气相外延在衬底上生长半导体材料的方法，包括在多个管道中的每一个中建立气流，并且在单个运动平面中将衬底从一个管道移动到另一管道。 用于该方法的合适装置包括多个管道; 用于沿每个管道建立气流的装置; 衬底支撑构件，其上可以具有用于衬底位置的凹槽; 和用于移动的装置。 旋转，支撑构件。 在使用中，基板依次暴露于至少两个气流，例如， 在InP上增长GaInAs。
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公开(公告)号：US4621282A
公开(公告)日：1986-11-04
申请号：US727555
申请日：1985-04-26
申请人： David J. Ahern
发明人： David J. Ahern
摘要： Stereo audio signals are transmitted over optical fibres in a cable TV system in which stereo radio signals are received and demodulated to produce respective stereo multiplex signals. These stereo multiplex signals are then sampled, digitized and combined to produce a digital multiplex. The digital multiplex is carried over an optical fibre by first modulating the frequency of a video sub-carrier which in turn modulates the intensity of light emitted by a light source. At a switching point stereo multiplex signals are regenerated which modulate FM carriers having substantially the same frequency as the original radio signals.
摘要翻译： 立体声音频信号通过有线电视系统中的光纤传输，其中立体声无线电信号被接收和解调，以产生相应的立体声复用信号。 然后对这些立体声多路复用信号进行采样，数字化和组合以产生数字多路复用。 数字多路复用通过首先调制视频副载波的频率而承载在光纤上，视频副载波又调制由光源发射的光的强度。 在切换点，立体声复用信号被再生，其调制具有与原始无线电信号基本上相同的频率的FM载波。
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公开(公告)号：US4560965A
公开(公告)日：1985-12-24
申请号：US672235
申请日：1984-11-16
申请人： Ian G. Gosling , Richard D. Carver
发明人： Ian G. Gosling , Richard D. Carver
摘要： A microwave dielectric resonator, e.g. for use in a microwave filter or oscillator, is provided with a tough low loss mount. The mount comprises a polymeric support layer 4, which is provided with an aperture 3 beyond which the resonator extends. About the first polymer layer 4 are a pair of polymeric retaining layers 2, 2'. These three polymer layers may be heat bonded together to secure the resonator. Interlayers 5 may be used between the three polymer layers 4, 2, 2' in order to effect a bond.
摘要翻译： 微波介质谐振器，例如 用于微波滤波器或振荡器，具有坚固的低损耗安装。 支架包括聚合物支撑层4，其设置有孔3，谐振器延伸穿过该孔3。 关于第一聚合物层4是一对聚合物保持层2,2'。 这三个聚合物层可以热粘合在一起以固定谐振器。 为了实现粘合，可以在三个聚合物层4,4,2'之间使用中间层5。
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