Xetron Corporation

Other

Northrop Grumman Systems Corporation

Westinghouse Electric Corporation

Roger W Dickerson

George W Waslo

Jimmy Chess

Daniel Alley

Thomas C Nguyen

Jack Lorthioir

An extensible filter structure is disclosed allowing realizable effective filtering over many decades in frequency. Multiple devices operating with mismatched frequency ranges can be multiplexed together with or without switching.

Ultra broadband network of fixed or switched frequency selective filters

A magnetic sensor assembly () uses printed circuit boards (PCB) () having a first surface () and an opposite, complementary second surface () to fabricate the sensor devices () and their associated processing circuitry. A trace or conductive element (), or pair () of complementary printed traces or conductor elements, on or within the board () are run beneath the magnetic sensor element (), with the return trace or traces routed more remotely from the sensor ().

Built-in testing and transient avoidance for magnetic sensors

A magnetic sensor assembly (S) of the type having at least one capacitor () electrically connecting an output signal () from a magnetic sensor unit () to an output signal source () includes switch () for controllably electrically disconnecting the capacitor () from output signal () and alternatively connecting the capacitor (). The capacitor () is disconnected from the magnetic sensor unit () by the switch () during times that transient signals may be generated by the magnetic sensor unit () thereby preventing the capacitor () from being charged. A magnetic sensor assembly () uses printed circuit boards (PCB) () having a conductive element () on or within the PCB () beneath a magnetic sensor element () for testing.

An RF modem used with a host device for transmitting information to, and receiving information from, other host devices. Prior to a transmission, the information is Manchester encoded and transmitted by On/Off Keying. A superregenerative receiver circuit (which may also operate as the transmitter) operating at the transmitted frequency detects the transmitted information. The information is recovered in conjunction with a timing function which times the buildup of RF energy within the receiver circuit so that a transmitted binary 1 can be distinguished from a binary 0. For use in a system with a plurality of hosts, multiple channels of operation are provided. In order to conserve power, the apparatus is operated in a power saving, sleep or scanning mode, as well as a full power active mode.

RF modem apparatus

Superregenerative circuit

A method for processing electrical signals includes the steps of: storing a plurality of first data signals, each representative of an instantaneous amplitude of a first input signal in a memory; selecting one of the first data signals in response to a second input signal; combining the selected one of the first data signals with a second data signal representative of a subsequent instantaneous amplitude of the first input signal, to produce a difference signal; producing a first output signal in response to the difference signal; and combining the difference signal and the selected first data signal to produce a modified data signal and for replacing the selected one of the first data signals with the modified data signal in the memory. The method can be performed by an equalizer in a circuit for compensating for amplitude variations in a radio frequency signal or by a comb notch filter. The invention also encompasses circuits and combinations of such circuits which perform the above signal processing method.

Method and circuit for processing and filtering signals

This invention provides a method and circuit for separating a signal of interest from a composite signal including a signal of interest and an angle modulated interfering signal, in which an in-phase component of a reference signal representative of a composite signal is mixed with the composite signal to produce a first compound signal, selected components from the first compound signal are removed to produce a first filtered signal, and the in-phase component of the reference signal is mixed with the first filtered signal to produce a second compound signal. Similarly, a quadrature component of the reference signal is mixed with the composite signal to produce a third compound signal, selected components from the third compound signal are removed to produce a second filtered signal, and the quadrature component of the reference signal is mixed with the second filtered signal to produce a fourth compound signal. The second and fourth compound signal are combined to produce an output signal in which the spectral power density of the signal of interest is greater than the spectral power density of the interfering signal. In an alternative embodiment, the reference signal may be derived from either a the first or third compound signal or both. The reference signal may alternatively be representative of the interfering signal.

Method and circuit for radio frequency signal detection and interference

This invention provides a method and circuit for separating a signal of interest from an angle modulated interfering signal in which a composite signal, including the signal of interest and the interfering signal, is used to produce first and second signals, the first signal being representative of the composite signal and the second signal being representative of the envelope of the composite signal. Selected components are removed from the second signal to produce a filtered signal. The filtered signal is mixed with the first signal, to produce an output signal including a component representative of the signal of interest having a greater spectral power density than other components of the output signal.

Method and circuit for non-cooperative interference suppression of radio

A method for processing electrical signals includes the steps of: storing a plurality of first digital data signals each representative of an instantaneous amplitude of a first input signal in a memory; selecting one of the first digital data signals in response to a second input signal; combining the selected one of the first digital data signals with a second digital data signal representative of a subsequent instantaneous amplitude of the first input signal, to produce a digital difference signal; producing a first output signal in response to the digital difference signal; and combining the digital difference signal and the selected first digital data signal to produce a modified digital data signal and for replacing the selected one of the first digital data signals with the modified digital data signal in the memory. The method can be performed by an equalizer in a circuit for compensating for amplitude variations in a radio frequency signal or by a comb notch filter. The invention also encompasses circuits which perform the above signal processing method.

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Loveland, OH, United States of America

Roger W Dickerson