Donald K Mcgrath

Author:

Donald Rayson McGrath

ISBN #:

0595250963

US Patent:

6366231, Apr 2, 2002

Filed:

Apr 10, 2000

Appl. No.:

09/546623

Inventors:

Naresh Kesavan Rao - Clifton Park NY
Daniel David Harrison - Delanson NY
Donald Thomas McGrath - Clifton Park NY
Jerome Johnson Tiemann - Schenectady NY

Assignee:

General Electric Company - Schenectady NY

International Classification:

H03M 150

US Classification:

341166, 341156

Abstract:

An analog to digital conversion circuit for converting an analog input signal into a plurality of binary output bits includes an operational amplifier and an integrating capacitor for storing a charge proportional to the integral of the input signal. A charge subtracting circuit removes a first predetermined charge from the integrating capacitor when an output charge of the operational amplifier is substantially equal to a second predetermined charge. The first predetermined charge level is removed from the integrating capacitor a number of times. The removal of the first predetermined charge from the integrating capacitor allows the integral of the analog input signal to be larger than a maximum charge capable of being stored by the integrating capacitor. A digital logic circuit tracks the number of times that the first predetermined charge is removed from the integrating capacitor by the charge subtracting circuit, and the digital logic circuit provides at least one bit of the plurality of binary output bits. A residue quantizing circuit determines a residual charge in the integrating capacitor and provides at least one additional bit of the plurality of binary output bits corresponding to the residual charge.

US Patent:

6430210, Aug 6, 2002

Filed:

Apr 5, 1999

Appl. No.:

09/285664

Inventors:

Donald Thomas McGrath - Clifton Park NY
John Erik Hershey - Ballston Lake NY

Assignee:

General Electric Company - Niskayuna NY

International Classification:

A61F 206

US Classification:

375130, 375316

Abstract:

A receiver for enabling one-way communications in a GHM network which does not interfere with or reduce the capability of the GHM network. The receiver detects a small modulation factor signal present on the GHM signal normally transmitted by the GHM transmitter. If the frequency of the modulated signal corresponds to a pre-defined frequency, then the receiver generates a command signal to, for example, a relay, annunciator, or other external device. More particularly, and in one embodiment, the receiver includes a filter which partially isolates the GHM energy from the lower 60 Hz harmonics. The receiver also includes a envelope detector coupled to filter. The envelope detector is coupled to a frequency detector. The frequency detector is coupled to a command decoder. The command decoder determines whether a plurality of AM modulation frequencies are present on the received signal.

US Patent:

6567495, May 20, 2003

Filed:

Mar 6, 2001

Appl. No.:

09/799173

Inventors:

Donald Thomas McGrath - Clifton Park NY
David Michael Hoffman - New Berlin WI

Assignee:

General Electric Company - Niskayuna NY

International Classification:

G01N 2300

US Classification:

378 19, 348308

Abstract:

A detector device used in an imaging system includes a photodiode array that is positioned to detect radiation transmitted by the imaging system. A switch array is connected to the photodiode array. The switch array has an output and comprises switch banks having switches. A control logic circuit is connected to the switch array and controls the state of the switches in the switch banks based on a predefined switching configuration. The control logic circuit also includes a memory device programmed to store the predefined switching configurations. The predefined switching configurations represent respective operational modes of the imaging system wherein each respective operational mode has a respective predetermined detector slice thickness.

US Patent:

6519769, Feb 11, 2003

Filed:

Nov 9, 1998

Appl. No.:

09/188127

Inventors:

Michael Robert Hopple - Schenectady NY
Richard Louis Frey - Delanson NY
Donald Thomas McGrath - Scotia NY
Robert John Dunki-Jacobs - Mason OH

Assignee:

General Electric Company - Niskayuna NY

International Classification:

H04N 716

US Classification:

725 14, 725 18

Abstract:

The present invention provides a system for recording a viewers television viewership habits. Sensors monitor the audio signal, synchronization signal, and video signal emanating from the television. A time coincidence channel tag is mixed with the transmitted television audio or video signal at a dwelling by a master unit. Then by matching the channel tag of the viewed channel with the channel tag, an accurate identification of the viewed channel can be made.

US Patent:

6768326, Jul 27, 2004

Filed:

Oct 1, 2001

Appl. No.:

09/682636

Inventors:

Dale M. Brown - Schenectady NY
Donald T. McGrath - Fort Collins CO
Charles David Greskovich - Schenectady NY
Robert Joseph Lyons - Burnt Hills NY

Assignee:

General Electric Company - Niskayuna NY

International Classification:

G01R 31302

US Classification:

324752, 3241581

Abstract:

A radiation detector includes: a scintillator which produces UV photons in response to receiving radiation from a radiation producing source; and, a wide bandgap semiconductor device sensitive to the UV photons produced by the scintillator. The semiconductor device produces an electric signal as a function of the amount of UV photons incident thereon. Preferably, the electric signal is then measure, recorded and/or otherwise analyzed.

US Patent:

54635691, Oct 31, 1995

Filed:

Jun 24, 1994

Appl. No.:

8/265343

Inventors:

Daniel A. Staver - Scotia NY
Donald T. McGrath - Scotia NY

Assignee:

General Electric Company - Schencetady NY

International Classification:

G06F 1531

US Classification:

3647241

Abstract:

A decimation filter for filtering an externally derived stream of quantized electrical signals includes a coefficient generator responsive to a set of externally derived decimation-ratio select signals to provide a separate normalized coefficient signal at each respective one of a plurality of output ports. The coefficient generator employs a zero-fill circuit comprising first and second circuits which selectively ripple therethrough an scaling-control output signal from a demultiplexer unit in order to provide the normalized coefficient signals. An accumulator is coupled to the coefficient generator to receive each normalized coefficient signal generated therein. The accumulator receives the stream of quantized electrical signals so as to produce, upon masking with respective ones of the received normalized coefficient signals, a plurality of accumulator output signals. An overflow detector is coupled to the accumulator to detect and correct any overflow condition arising in the accumulator.

US Patent:

62593897, Jul 10, 2001

Filed:

May 6, 1999

Appl. No.:

9/306026

Inventors:

Donald Thomas McGrath - Clifton Park NY

Assignee:

General Electric Company - Schenectady NY

International Classification:

H03M 110
H03M 106

US Classification:

341120

Abstract:

The present invention provides a method and apparatus which uses data containing non-linearity information regarding the integrator circuits used in over-sampled Analog-to-Digital Converters to predict the Signal-to-Distortion Ratio and the Signal-to-Noise Ratio. Input response data used to evaluate the device is either obtained from simulations when designing the integrator circuit, or in situ testing of the integrators when testing an over-sampled Analog-to-Digital Converter integrated circuit. The non-linearity data can be generated by simulating or testing the Analog-to-Digital Converter circuit for several hundred clock cycles and measuring the inputs and outputs of each integrator. This data is used to predict the Signal-to-Distortion Ratio and the Signal-to-Noise Ratio.

US Patent:

55485405, Aug 20, 1996

Filed:

Jun 24, 1994

Appl. No.:

8/265475

Inventors:

Daniel A. Staver - Scotia NY
Donald T. McGrath - Scotia NY

Assignee:

General Electric Company - Schenectady NY

International Classification:

G06F 1531

US Classification:

3647241

Abstract:

A decimation filter for filtering an externally derived stream of quantized electrical signals having a predetermined rate includes a coefficient generator responsive to a set of externally derived decimation-ratio select signals to provide a separate normalized coefficient signal at each respective one of a plurality of output ports. An accumulator is coupled to the coefficient generator to receive each normalized coefficient signal generated therein. The accumulator receives the stream of quantized electrical signals so as to produce, upon masking with respective ones of the received normalized coefficient signals, a plurality of accumulator output signals. An overflow detector is coupled to the accumulator to detect and correct any overflow condition arising in the accumulator.