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| Number | Title | Issue Date |
| 7292645 | Binary transmitter and method of transmitting data in binary format The present invention provides a binary transmitter. In one embodiment, the binary transmitter includes a data coder that receives and encodes binary data to be transmitted and a modulator that employs the binary data directly to modulate a carrier wave to yield a s... | 11/06/2007 |
| 7265478 | RF calibration of saw interrogators Disclosed is an apparatus and methodology for insuring measurement accuracy and performance reliability in the operation of devices employed to interrogate SAW devices. The present subject matter relates to an arrangement and methodology that provides an interrogato... | 09/04/2007 |
| 7212691 | Polarization-shaped duobinary optical transmission apparatus A polarization-shaped duobinary optical transmission apparatus is disclosed. The apparatus includes a light source that generates light having a continuous wave, an optical intensity modulator that converts the light into an optical intensity signal based upon an in... | 05/01/2007 |
| 7200191 | De-modulation of MOK (M-ary orthogonal modulation) A system and method for the iterative detection and demodulation of M-ary orthogonal signals (MOK) and signals modulated using Complementary Code Keying (CCK) is described. An important feature of these methods is the good performance of noncoherent detectors in AWG... | 04/03/2007 |
| 6980289 | System and method for measuring and compensating for the polarization mode dispersion of an optical signal A system and method for measuring and compensating for the polarization mode dispersion of first and higher orders for a transmitted optical signal are described wherein the propagation time difference, caused from polarization mode dispersion, between orthogonally ... | 12/27/2005 |
| 6947489 | Combined preamble detection and information transmission method for burst-type digital communication systems Burst transmissions in a burst-type communication system include a preamble synchronization sequence which allows detection and synchronization a burst transmission while at the same time providing information to a receiver, for example, on the subsequent burst payl... | 09/20/2005 |
| 6629121 | Surface acoustic wave-matched filter and differential detector for demodulating spread spectrum signals A surface acoustic wave-matched filter is disclosed which comprises: an input transducer provided on a piezoelectric substrate surface; a first output transducer, that is, a forward output transducer encoded in correspondence to a pseudo-noise code sequen... | 09/30/2003 |
| 6047306 | CDMA communication RF signal processing apparatus using SAW A surface acoustic wave signal processing apparatus for processing first and second high-frequency signals having frequencies f1 and f2 respectively, which comprises: first and second surface acoustic wave delay elements for receivin... | 04/04/2000 |
| 5962950 | Compact surface acoustic wave apparatus, spread spectrum signal receiver using the same apparatus for reception of spread spectrum signal, and spread spectrum signal communication system using the same spread spectrum signal receiver In a surface acoustic wave apparatus, a surface acoustic wave element for obtaining a convolution signal is housed in a recess of a substrate. Since the surface acoustic wave element is housed in the recess of the substrate in this surface acoustic wave a... | 10/05/1999 |
| 5815055 | Matched filter with improved synchronous characteristics, and reception device and communication system using the same A matched filter has an input IDT and an output IDT, and also has a device for preventing propagating surface acoustic waves from diverging. By preventing the divergence of surface acoustic waves, signals obtained in units of electrode finger pairs of the... | 09/29/1998 |
| 5717274 | Efficient surface acoustic wave device capable of excitation in plural frequency bands, and signal receiver and communication system utilizing the same A surface acoustic wave device includes a piezoelectric substrate, a wave guide path provided on the piezoelectric substrate and an interdigital transducer for exciting a surface acoustic wave. The interdigital transducer is provided with plural portions ... | 02/10/1998 |
| 5675207 | Surface acoustic waver convolver A surface acoustic wave convolver of the present invention includes, on a surface of a piezoelectric substrate, a pair of comb-like surface acoustic wave excitation electrodes 2 and 3, and a center electrode 4. The excitation electrodes 2 and 3 are dispos... | 10/07/1997 |
| 5661358 | Demodulation apparatus and communication system using the same A demodulation apparatus and a communication system using the same are disclosed. The apparatus comprises code generation means for generating a reference spread code corresponding to a first signal modulated by a spread code, and an elastic surface wave ... | 08/26/1997 |
| 5539687 | Correlator and communication system using it A correlator includes a reference signal generating device for generating a reference signal with period T, n-convolvers each having an action time of T/n where n is an integer of at least 2, into each of which an information signal and a reference signal... | 07/23/1996 |
| 5530410 | Acoustic frequency mixing devices using potassium titanyl phosphate and its analogs Acoustic frequency mixing devices for controlling high frequency signals by the generation of acoustic waves are disclosed. The devices include (a) a crystalline substrate of MTiOXO4 (wherein M is K, Rb, Tl and/or NH4 and X is P and/... | 06/25/1996 |
| 5477098 | Efficient surface acoustic wave device capable of excitation in plural frequency bands, and signal receiver and communication system utilizing the same A surface acoustic wave device includes a piezoelectric substrate, a wave guide path provided on the piezoelectric substrate and an interdigital transducer for exciting a surface acoustic wave. The interdigital transducer is provided with plural portions ... | 12/19/1995 |
| 5448126 | Surface acoustic wave-semiconductor composite device In a surface acoustic wave-semiconductor composite device such as a surface acoustic wave convolver, a piezoelectric plate and a semiconductor plate are layered directly or with a gap between them. Input electrodes are provided to apply a plurality of inp... | 09/05/1995 |
| 5444322 | Elastic convolver An elastic convolver 11 constructed by forming a set of input idts 13 spaced apart from each other by a predetermined distance on an LiNbO3 piezoelectric substrate, forming a waveguide path 14 in the center of an area between the IDTs 13, respe... | 08/22/1995 |
| 5434893 | Component for a differential transmitter-receiver of signals with direct sequence spread spectrum and the corresponding transmitter-receiver The component essentially comprises two correlators (TR1, F1), (TR2, F2) shifted by one period or cycle from the information element. This component fulfils both the correlation and delay functions. The component also comprises a transmission channel with... | 07/18/1995 |
| 5430876 | Remote procedure callback system and method A method is provided for executing an application on a compute server of a computer network or other computer system that includes the compute server and at least one client system. The client system makes a remote procedure call to the compute server, an... | 07/04/1995 |
| 5417114 | Echo based detecting apparatus employing signal generator and correlator An ultrasonic detecting apparatus which includes a sequence generating means and a transmission signal generating means for generating a transmission signal corresponding to the sequence. The detecting apparatus also includes a transmitting means to trans... | 05/23/1995 |
| 5415045 | Apparatus and method for detecting flaws in and inspecting an object An ultrasonic detecting apparatus which includes a generator which generates more than three transmission signals. The detecting apparatus also includes a transmitter/receiver which transmits waves, which may be ultrasonic waves, to an object and receives... | 05/16/1995 |
| 5374863 | Surface acoustic wave device, and demodulation device and communication system using the same A surface acoustic wave device includes a piezoelectric substrate, an input electrode formed on the substrate and an output electrode formed on the substrate. A surface acoustic wave is generated from the input electrode to propagate in a predetermined di... | 12/20/1994 |
| 5367216 | Surface acoustic wave element and communication system using the same A surface acoustic wave element is provided with a piezoelectic substrate, a first input transducer, a second input transducer and an output device such as output electrode. The piezoelectric substrate has a first and a second surfaces which are mutually ... | 11/22/1994 |
| 5336957 | Surface acoustic wave convolver A surface acoustic wave convolver includes first and second interdigital electrodes for exciting surface acoustic waves and an output electrode for detecting the surface acoustic waves to extract a convolution output as an electrical signal, the first and... | 08/09/1994 |
| 5281882 | Surface acoustic wave element A GaAs piezoelectric semiconductor thin film in the form of an epitaxial film is provided on a Si substrate 1, and an input transducer 3 and an output transducer 4 for input and output of a surface acoustic wave are provided on the film. A surface acousti... | 01/25/1994 |
| 5268859 | Process for obtaining compensation quantity to compensate the nonuniformity of a surface wave convolver A process obtains a compression quantity to compensate the nonuniformity of a surface wave convolver. A surface wave convolver includes an elongate piezoelectric crystal, to the ends of which interdigital transducers are fitted to convert electrical input... | 12/07/1993 |
| 5262977 | Surface acoustic wave convolver A convolver has a piezoelectric film layer, an insulator layer and a semi-conductor layer. A surface resistance measurement part permits measurement of a surface resistance related to the surface resistance seen by a gate electrode of the convolver. The s... | 11/16/1993 |
| 5249293 | Computer network providing transparent operation on a compute server and associated method A method is provided for executing an application on a compute server of a computer network that includes the compute server and at least one client system, the method comprising the steps of: activating a process and a server thread running on the comput... | 09/28/1993 |
| 5243250 | Surface acoustic wave convolver device In an SAW convolver device constructed by sealing an SAW convolver element having a piezoelectric film/insulator/semiconductor structure by means of a cover of a package, according to the present invention, an insulating base plate is disposed on a part o... | 09/07/1993 |
| 5226004 | Surface acoustic wave filter device A surface acoustic wave filter device includes a plurality of surface acoustic wave convolvers each having an output electrode between two input transducers, one of the input transducers of each convolver receiving a reference signal through a respective ... | 07/06/1993 |
| 5200663 | Surface acoustic wave device provided with output transducer split into a plurality of portions, and communication system using the same A surface acoustic wave device comprises a piezoelectric substrate, a plurality of input transducers, formed on the substrate, for generating surface acoustic waves corresponding to input signals, a plurality of waveguides which are juxtaposed on a region... | 04/06/1993 |
| 5189330 | Surface acoustic wave device An SAW convolver is disclosed, in which a pair of input transducer means disposed at the left and right end portions on a piezoelectric substrate having a velocity dispersion consists of a plurality of pairs of input transducers and the distance between d... | 02/23/1993 |
| 5187681 | Controlling apparatus for improving start up time for a convolver A control apparatus for a surface acoustic wave convolver element having a gate electrode, a grounded electrode and a piezoelectric layer therebetween. A bias voltage variable within a predetermined range is applied to the gate electrode so as to cause th... | 02/16/1993 |
| 5185548 | Surface acoustic wave device with reflected wave at side edges on waveguide suppressed and communication system using the same A surface acoustic wave device comprises a substrate, a plurality of input transducers formed on the substrate for generating first and second surface acoustic waves propagating in opposite directions to each other, and a plurality of waveguides arranged ... | 02/09/1993 |
| 5164628 | Elastic surface wave convolva having wave width converting means and communication system using same An elastic surface wave convolve comprises a piezoelectric substrate, a plurality of input transducers formed on said substrate for generating elastic surface waves corresponding to respective input signals, a plurality of waveguides provided side by side... | 11/17/1992 |
| 5070472 | Convolver optimum bias circuit A convolver optimum bias circuit is disclosed, in which a DC bias voltage representing a phase difference between a signal corresponding to the output of an oscillator given to the gate electrode of the convolver and the output of a convolver phase circui... | 12/03/1991 |
| 5065629 | Ultrasonic insection apparatus An ultrasonic flaw inspecting apparatus is provided in which the transmission signals comprising N number of the binary code sequences having sharp autocorrelation functions are input to an object to be inspected by a single transducer for transmission an... | 11/19/1991 |
| 5056055 | Coherent surface acoustic wave unique word detector A unique word in a digital communication system is detected on a receiving side by using an acoustic surface wave matched filter (4) having a piezoelectric substrate, an input interdigital electrode (4c) and and output interdigital electrode (4a, 4b) on t... | 10/08/1991 |
| 5045743 | Surface acoustic wave device A surface acoustic wave device including a surface acoustic wave convolver element, provided with two input transducers disposed on a piezoelectric substrate and a rectangular output gate disposed between the two input transducers, is disclosed, in which ... | 09/03/1991 |
