Optical filter tuned by rotation and comprising a Fabry-Perot interferometer
The present invention consists in a rotation tuned optical filter comprising a Fabry-Perot type interferometer disposed between an optical source and an optical receiver wherein said interferometer fi... Read More
Inventors: Chiaroni, Dominique; Morin, Paulette;, Assignee: Alcatel Cit (Paris, FR) |
High-power waveform generator
OF THE PREFERRED EMBODIMENTS Referring now to the drawings wherein like reference numerals refer to like elements throughout, FIGS. 1 and 2 illustrate the inventive concept set forth in the above cro... Read More
Inventors: Przybysz, John Xavier; Caldwell, Stephen Pusey; Miller, Donald Lynn; Miklich, Andrew Hostetler;, Assignee: Northrop Grumman Corporation (Los Angeles, CA) |
RF pulse transmitter having incidental phase modulation (IPM) correction
The present invention relates to an RF pulse transmitter, preferably for use in precision distance measuring equipment (DME/P) of a microwave landing system, having incidental phase modulation (IPM) c... Read More
Inventors: Kennett, Scott W.;, Assignee: E-Systems, Inc. (Dallas, TX) |
Method and apparatus for reducing off-channel interference produced by a linear transmitter
What is claimed is: 1. In a linear transmitter that includes an information signal source and a power amplifier having a varying load impedance, the linear transmitter utilizing a closed loop feedback... Read More
Inventors: Cygan, Lawrence F.; Gailus, Paul H.; Turney, William J.; Baker, Michael H.;, Assignee: Motorola, Inc. (Schaumburg, IL) |
Radio transmitter with power amplifier linearizer
According to the a first aspect of the present invention, a radio transmitter is provided comprising: a power amplifier; linearizer means coupled to the amplifier for compensating for non-linearity in... Read More
Inventors: Horowitz, Ilan; Ayun, Moshe Ben; Shamsian, Roni; Grabsky, Nachman; Rozental, Mark;, Assignee: Motorola, Inc. (Schaumburg, IL) |
Radio receiver
Therefore, this invention was created in view of the above-mentioned facts, and an object thereof is to provide a circuit constructing technique for a radio receiver which keeps intact the advantages ... Read More
Inventors: Kawai, Kazuo;, Assignee: General Research of Electronics, Inc. (Tokyo, JP) |
Noninvasive diagnostic system for coronary artery disease
Accordingly, the present invention has been developed to overcome the foregoing shortcomings by providing a system in which coronary artery disease may be detected both reliably and noninvasively. It ... Read More
Inventors: Semmlow, John L.; Welkowitz, Walter; Kostis, John; Akay, Metin;, Assignee: Rutgers, The State University of New Jersey (New Brunswick, NJ) |
Method and apparatus for checking continuity of optic transmission
The present invention is directed at an apparatus for and a method of detecting whether or not a fiber optic link is established for enabling transmission of information between a transmitter and a re... Read More
Inventors: Levin, Paul; Minnerly, Barry;, Assignee: Rebo Research, Inc. (New York, NY); Meret, Inc. (Santa Monica, CA) |
Transmission power control circuit
An object of the invention is in that the gate bias voltage of the RF power module is varied in response to the transmission power and thereby the ratio of the idle current is optimized and the effici... Read More
Inventors: Miyama, Keisei; Ono, Hideyo;, Assignee: Mitsubishi Denki Kabushiki Kaisha (Tokyo, JP) |
Protected amplifier apparatus
In FIG. 1, an input lead 10 provides RF signals to an ALC (automatic level control) block gain control means or feedback controller 12. This controller has the fast attack, slow decay characteristic ... Read More
Inventors: Harrington, Timothy A.;, Assignee: Rockwell International Corporation (El Segundo, CA) |
Transmitter testing method
OF INVENTION While the present invention will be described more fully hereinafter with reference to the accompanying drawings, in which a preferred embodiment of the present invention is shown, it is... Read More
Inventors: Idol, Charles A.;, Assignee: |
Shared resources modulator-demodulator circuits for use with quadrature amplitude modulated signals
We have advantageously overcome the deficiencies associated with use of separate modulator-demodulator circuits as conventionally taught in the art through our inventive transceiver circuits, one for ... Read More
Inventors: Koslov, Joshua Lawrence; Lane, Frank Anton; Scarpa, Carl G.;, Assignee: Hitachi America, Ltd. (Tarrytown, NY) |
Digital premodulation filter
It is an object of the present invention to provide a digital premodulation filter circuit for generating various forms of continuous phase modulation (CPM). Examples of such CPM are minimum shift key... Read More
Inventors: Collison, Robert R.; Wende, Michael T.; Birgenheier, Raymond A.;, Assignee: Hewlett-Packard (Palo Alto, CA) |
Modulator having direct digital synthesis for broadband RF transmission
In accordance with the invention, a modulator is provided for use in the 5-40 MHz reverse channel and which requires a single frequency translation from baseband to RF, thus eliminating the convention... Read More
Inventors: Graham, Hatch;, Assignee: Stanford Telecommunications, Inc. (Sunnyvale, CA) |
Amplitude and phase error normalization of subcarrier generator
A subcarrier generator under a preferred form of the present invention includes a bandpass finite impulse response (FIR) filter determined by a set of FIR coefficients. Under the present invention, a ... Read More
Inventors: English, James D.;, Assignee: Seiko Communication Systems, Inc. (Beaverton, OR) |
Signal processor
An object of the present invention is to provide a signal processor of the above known type, but which reduces the need for clipping of the output signal and which thus allows the use of a cheaper DAC... Read More
Inventors: Mestdagh, Denis Julien Gilles;, Assignee: Alcatel N.V. (Rijswijk, NL) |
Analog to digital converter
In view of the above-described problem of the prior art, it is an object of the present invention to provide an A/D converter whereby the number of the component parts, the circuit scale and costs may... Read More
Inventors: Ueki, Masaaki;, Assignee: Sony Corporation (Tokyo, JP) |
High frequency multichannel diversity differential phase shift (DPSK) communications system
The object of the present invention is to provide a multichannel diversity DPSK modulated communications system which overcomes the known HF propagation and interference problems and will optimally re... Read More
Inventors: Wilkinson, Robert;, Assignee: The Secretary of State for Defence in Her Britannic Majesty's Government (London, GB2) |
Interface circuit for connecting a digital equipment to a time multiplex link
The present invention thus provides an interface circuit for connecting a digital equipment, at least partially under its own control, for transmitting and receiving digital data to a two-way time mul... Read More
Inventors: Gass, Raymond; Ruhlmann, Andre;, Assignee: La Telephonie Industrielle et Commerciale Telic Alcatel (Strasbourg, FR) |
Method of generating bevel and hypoid gears
The present invention is directed to a process of modifying standard generating motions for producing bevel and hypoid gears in order to effect desired tooth surface geometries. Additional controlled ... Read More
Inventors: Goldrich, Robert N.;, Assignee: The Gleason Works (Rochester, NY) |
Method and apparatus for debugging and tuning a process control network having distributed control functions
The present invention is directed to a method of and an apparatus for debugging and tuning a process control network having distributed control functions. In accordance with one aspect of the present ... Read More
Inventors: Larson, Brent H.; Burns, Harry A.; Brown, Larry K.;, Assignee: Fisher Controls International, Inc. (Clayton, MO) |
Improved sigma-delta type analog-to-digital converter and method
The present invention provides a method and architecture for high channel count multiplexing into a sigma delta converter for low frequency measurement applications by partitioning the digital filteri... Read More
Inventors: Sramek, Jr., John;, Assignee: Harris Corporation (Melbourne, FL) |
Analog-to-digital converter
It is, therefore, a principal object of the present invention to provide an analog-to-digital converter that is substantially immuned to device DC offset voltage, clock feedthrough, channel charge err... Read More
Inventors: Zarabadi, Seyed R.; Komisarcik, Edward A.;, Assignee: Delco Electronics Corporation (Kokomo, IN) |
Tool center point calibration apparatus and method
The present invention provides a tool center point calibration unit for a robot. The tool center point calibration unit includes a frame positioned within the robot envelope. A tool center point calib... Read More
Inventors: Thorne, Henry F.;, Assignee: Cycle Time Corporation (Pittsburgh, PA) |
Polygraphic encryption-decryption communications system
In accordance with this invention, an electronic memory is loaded with a binary matrix of "0" or "1" signal states, and the rows and columns of the matrix are made up so that the matrix is an invertib... Read More
Inventors: Wilson, William J.;, Assignee: |
Alternating variable delay control arrangement and method for push-pull audio transducers
What is claimed as new and desired to be secured by Letters Patent of the United States is: 1. A control arrangement for a push-pull audio transducer system of the type including two transducers coaxi... Read More
Inventors: Edwards, Edward W.;, Assignee: |
Loudspeaker with heat radiating hole and electrical device employing the same
It is therefore an object of the present invention to provide a loudspeaker superior in space saving ability for enabling down-sizing of a device, to which the loudspeaker is employed, and an electron... Read More
Inventors: Watanabe, Shoji;, Assignee: NEC Corporation (Tokyo, JP) |
Low range loudspeaker system
What is claimed is: 1. An audio speaker system comprising the usual driven primary radiator having a cone and a voice coil and capable of responding to audio frequency signals extending over a wide ra... Read More
Inventors: Nestorovic, Mioljub R.; Modafferi, Richard;, Assignee: Electro Acoustical Labs, Inc. (New York, NY) |
Passive radiator cooled electronics/heat sink housing for a powered speaker
What is claimed is: 1. An electronics/heat sink housing for a powered speaker having a speaker enclosure with a rear panel, a front panel, a pair of side panels, and a pair of end panels, a passive ra... Read More
Inventors: Perkins, Calvin C.; Wetherbee, Terry L.; Bie, David D.;, Assignee: Mackie Designs Inc. (Woodinville, WA) |
Audio signal processing apparatus
What is claimed is: 1. In combination, four conducting means, source and selector means for selectively supplying four channel discrete quadraphonic audio program signals to said four conducting means... Read More
Inventors: Driscoll, Norman Joseph;, Assignee: Yudin Industries, Inc. (Murray Hill, NJ) |
Audio Signal Processing 
