Jaime A Roman

US Patent:

58100148, Sep 22, 1998

Filed:

Mar 25, 1997

Appl. No.:

8/827032

Inventors:

Dennis W. Davis - Boca Raton FL
Jaime R. Roman - Palm Beach Gardens FL
James H. Michels - Clinton NY

International Classification:

A61B 500

US Classification:

128923

Abstract:

The invention described herein is directed to a method and associated system for the detection of various physiological conditions using multichannel sensor data. Truth data organized in the form of a vector sequence is used to generate a multichannel state variable model for a given known physiological condition. Such state variable models are obtained using one or more of a host of system identification algorithms. Upon identification of the model parameters, a multichannel inverse filter is derived from the model parameters. The inverse filter can be used to whiten or decorrelate sensor data sequences that are associated with the given physiological condition. The degree of whitening is a measure of the match of an unknown physiological condition with that physiological condition represented by the data used to generate the filter. On this basis, a number of such filters can be produced for a variety of physiological conditions. In a preferred embodiment, these filters operate in parallel on a given multichannel data sequence that represents an unknown physiological condition.

US Patent:

62263218, May 1, 2001

Filed:

May 8, 1998

Appl. No.:

9/074821

Inventors:

James H. Michels - Clinton NY
Muralidhar Rangaswamy - Marlborough MA
Jaime R. Roman - Palm Beach Gardens FL
Dennis W. Davis - Eustis FL

Assignee:

The United States of America as represented by the Secretary of the Air
Force - Washington DC

International Classification:

H04B 346
H03D 100
H03D 104

US Classification:

375227

Abstract:

Apparatus and method for improving the detection of signals obscured by either correlated Gaussian or non-Gaussian noise plus additive white Gaussian noise using Estimates from multi-channel data of model parameters that describe the noise disturbance correlation are obtained from data that contain signal-free data vectors, referred to as "secondary" or "reference" cell data. These parameters form the coefficients of a multi-channel whitening filter. A data vector to be tested for the presence of a signal passes through the multi-channel whitening filter. The filter's output is then processed to form a test statistic. The test statistic is compared to a threshold value to decide whether a signal is "present" or "absent". Embodiments of the apparatus and method include estimating the signal amplitude both implicitly and explicitly and calculating test statistics for signal detection in both Gaussian and non-Gaussian noise.

US Patent:

59219378, Jul 13, 1999

Filed:

Jul 21, 1998

Appl. No.:

9/119927

Inventors:

Dennis W. Davis - Eustis FL
Jaime R. Roman - Palm Beach Gardens FL
James H. Michels - Clinton NY

International Classification:

A61B 500

US Classification:

600508

Abstract:

The invention is directed to a method and associated system for the detection of various physiological features in multichannel sensor data. Truth data organized in the form of a vector sequence is used to generate a multichannel state variable model for data that is known to lack physiological features of interest. Such state variable models are obtained using one or more of a host of system identification algorithms. Upon identification of the model parameters, a multichannel inverse filter is derived from the model parameters. The inverse filter can be used to whiten or decorrelate components of sensor data sequences that are not associated with the physiological features of interest. The unwhitened output of the inverse filter then represents the physiological features of interest that can be extracted from the concomitant white noise. On this basis, a number of such filters can be produced for a variety of undesired physiological feature components of the data that occur separately or in combination.

US Patent:

60913614, Jul 18, 2000

Filed:

May 12, 1998

Appl. No.:

9/076395

Inventors:

Dennis W. Davis - Eustis FL
Jaime R. Roman - Palm Beach Gardens FL
James H. Michels - Clinton NY

International Classification:

G01S 316
G01S 1300

US Classification:

342378

Abstract:

Processing methods and associated hardware architectures for the spatio-temporal processing of phased array sensor signals are disclosed. The processing method employs a joint spatio-temporal domain processing approach. The disclosed method is an optimal estimation scheme which exhibits significantly reduced computational burden. Suppression of interference sources at angles-of-arrival other than the desired signal is achieved implicitly. The associated system architecture provides not only the ability to achieve good joint angle-Doppler estimates, but offers the ability to easily trade the relative performance in each domain. The disclosed approach emphasizes the use of multiple hypothesis testing with spatio-temporal whitening filters.