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13 条记录 (耗时 0.024 秒)

    Method and system for simultaneously broadcasting and receiving digital and analog signals
    4.
    发明授权
    Method and system for simultaneously broadcasting and receiving digital and analog signals 失效
    用于同时广播和接收数字和模拟信号的方法和系统

    公开(公告)号：US06563880B1

    公开(公告)日：2003-05-13

    申请号：US09298093

    申请日：1999-04-22

    申请人： Bill J. Hunsinger ,  Derek D. Kumar

    发明人： Bill J. Hunsinger ,  Derek D. Kumar

    IPC分类号： H04H500

    CPC分类号： H04L27/2601 ,  H04B1/406 ,  H04B1/707 ,  H04H20/30 ,  H04H20/33 ,  H04H2201/17 ,  H04H2201/183 ,  H04J9/00 ,  H04J13/004 ,  H04J13/12 ,  H04J2013/0037 ,  H04L5/023

    摘要： A system and method for transmitting digital information through a medium such as atmospheric free-space includes a transmitter which generates a signal based on a basis set of mutually orthogonal, spectrally-shaped, sequences of substantially equal length and having predetermined autocorrelation values. The sequences may resemble noise in at least some of their characteristics. The orthogonality or cross-correlation characteristics, the autocorrelation characteristics and the resemblance to noise are due to features derived from sequences of pseudo-random numbers which themselves resemble noise in at least some of their characteristics. The waveform set based on the sequences is modulated digitally. The modulated set may be summed together along with a wideband reference signal of reduced amplitude and optionally an FM analog signal to form a composite signal which is broadcast typically through free space to at least one receiver. The receiver separates the analog FM signal from the digital signal and thereafter demodulates the digital data-carrying waveforms and outputs a stream of digital data. It has been determined to be resistant to multipath degradation.

    摘要翻译： 用于通过诸如大气自由空间的介质发送数字信息的系统和方法包括：发射机，其基于基本相等长度的相互正交，频谱形状的序列的基本集合生成信号，并具有预定的自相关值。 这些序列可能至少在其某些特征中类似于噪声。 正交性或互相关特性，自相关特性和与噪声的相似性是由于其自身类似于其至少某些特征中的噪声的伪随机数序列导出的特征。 基于序列的波形集合被数字地调制。 调制集可以与减小幅度的宽带参考信号和可选的FM模拟信号一起被合并在一起，以形成通常通过自由空间广播到至少一个接收机的复合信号。 接收器将模拟FM信号与数字信号分开，然后解调数字数据携带波形并输出数字数据流。 已经确定耐多种降解。

    Acoustic surface wave device with improved transducer
    7.
    发明授权
    Acoustic surface wave device with improved transducer 失效
    具有改进传感器的声学表面波装置

    公开(公告)号：US4143340A

    公开(公告)日：1979-03-06

    申请号：US719552

    申请日：1976-09-01

    申请人： Bill J. Hunsinger

    发明人： Bill J. Hunsinger

    IPC分类号： H03H9/02 ,  H03H9/145 ,  H03H9/04 ,  H01L41/10 ,  H03H9/26 ,  H03H9/30

    CPC分类号： H03H9/14552 ,  H03H9/02842 ,  H03H9/14591

    摘要： An acoustic surface wave device having a substrate of a material capable of propagating acoustic surface wave energy. At least one electro-acoustic transducer coupled to a region of a surface of the substrate. The transducer has a first and a second bus bar positioned parallel and a distance from each other. A plurality of electrodes extend from each bus bar. The electrodes from the first bus bar are opposite to the electrodes of the second bus bar with the electrodes from one of the bus bars being forked and surrounding the electrode located in an opposite relationship thereto, thus, reducing substantially any synchronous reflections.

    Surface acoustic wave device with reflection suppression
    8.
    发明授权
    Surface acoustic wave device with reflection suppression 失效
    表面声波装置具有反射抑制

    公开(公告)号：US4162465A

    公开(公告)日：1979-07-24

    申请号：US833028

    申请日：1977-09-14

    申请人： Bill J. Hunsinger ,  Kentaro Hanma

    发明人： Bill J. Hunsinger ,  Kentaro Hanma

    IPC分类号： H03H9/02 ,  H03H9/145 ,  H03H9/04 ,  H01L41/10 ,  H03H9/30 ,  H03H9/32

    CPC分类号： H03H9/14552 ,  H03H9/02842

    摘要： Applicants discovered that by employing selected transducer geometries, such as unbalanced dual-finger geometries, certain reflections, called "Mechanical electrical loaded" (MEL) reflections, can be generated which tend to cancel reflected waves inherently generated by surface acoustic wave devices.In particular, the disclosure is directed to a transducer for a surface acoustic wave device adapted for coupling to an electrical load and/or source. A pair of interdigitated comb electrodes are formed on an acoustic wave propagating substrate, for example a piezoelectric substrate. Means, such as input or output terminals, are provided for applying an electrical load and/or source across the pair of comb electrodes. Each of the comb electrodes has a plurality of interdigitated electrode fingers. The width of at least some of the adjacent fingers of the electrodes are different and are selected as a function of the impedance of the load and/or source to produce mechanical electrical loaded (MEL) reflections in said substrate which tend to cancel regeneration wave (RW) reflections generated at the transducer in the substrate. In the preferred embodiment of the invention, each of the comb electrodes has at least two adjacent electrode fingers of different widths, and preferably has a plurality of adjacent finger pairs of different widths.

    摘要翻译： 申请人发现，通过采用所选择的传感器几何形状，例如不平衡的双手指几何形状，可以产生一些称为“机械电加载”（MEL）反射的某些反射，这些反射倾向于消除表面声波器件固有地产生的反射波。

    Surface acoustic wave device having improved multi-strip coupler
    9.
    发明授权
    Surface acoustic wave device having improved multi-strip coupler 失效
    具有改进的多带耦合器的表面声波装置

    公开(公告)号：US4417221A

    公开(公告)日：1983-11-22

    申请号：US364924

    申请日：1982-04-02

    申请人： Bill J. Hunsinger

    发明人： Bill J. Hunsinger

    IPC分类号： H03H9/02 ,  H03H9/145 ,  H03H9/64 ,  H03H9/42

    CPC分类号： H03H9/6496 ,  H03H9/02779 ,  H03H9/14547 ,  H03H9/14564 ,  H03H9/02992 ,  H03H9/14517

    摘要： A surface acoustic wave (SAW) device is disclosed. The SAW device includes input and output transducers disposed in spaced acoustic tracks on a piezoelectric substrate material, and a multi-strip coupler for translating the acoustic beam generated by the input transducer into the acoustic track in which the output transducer is located. The multi-strip coupler is designed so as to minimize the influence of Fresnel peaks found to exist in the amplitude profile of the acoustic beam in the output acoustic track. The multi-strip coupler is longer than in the past, and includes a central fanned region for providing well defined acoustic boundaries whose locations do not vary from device to device.

    摘要翻译： 公开了一种表面声波（SAW）装置。 SAW器件包括设置在压电衬底材料上的间隔声道中的输入和输出换能器，以及用于将由输入换能器产生的声束转换成输出换能器所在的声轨的多带耦合器。 多带耦合器被设计成使输出声轨中的声束的振幅分布中存在的菲涅尔峰的影响最小化。 多带耦合器比过去更长，并且包括用于提供良好定义的声学边界的中心扇形区域，其位置在设备之间不变。

    Surface acoustic wave resonator
    10.
    发明授权
    Surface acoustic wave resonator 失效
    表面声波谐振器

    公开(公告)号：US4162466A

    公开(公告)日：1979-07-24

    申请号：US837569

    申请日：1977-09-28

    申请人： Bill J. Hunsinger ,  Roger D. Fildes

    发明人： Bill J. Hunsinger ,  Roger D. Fildes

    IPC分类号： H03H9/145 ,  H03H9/25 ,  H03H9/02 ,  H03H9/04 ,  H03H9/26 ,  H03H9/32

    CPC分类号： H03H9/25 ,  H03H9/14505

    摘要： Applicants have discovered that the performance of Surface Acoustic Wave Resonators can be markedly improved by digressing from the accepted techniques of sensing standing waves set up by resonation in the SAW device. Applicants have developed a SAW resonator which employs one or more unidirectional transducers which are sensitive to traveling rather than standing waves. This construction obviates the deletevious action of direct, broad band, input to output coupling and avoids the high position sensitivity which occurs when bidirectional transducers are utilized to sense standing wave patterns.

    摘要翻译： 申请人已经发现，表面声波谐振器的性能可以通过从SAW器件中谐振建立的感测驻波的公认技术中分离得到显着改善。 申请人开发了一种SAW谐振器，其采用对行进而不是驻波敏感的一个或多个单向换能器。 这种结构避免了直接，宽带，输出到输出耦合的可删除动作，并避免了当使用双向换能器来感测驻波模式时发生的高位置灵敏度。