DR. DOUGLAS J. JONES, M.D.
Radiology at University Ave, Champaign, IL

5272663, Dec 21, 1993

May 5, 1992

7/878842

Douglas L. Jones - Champaign IL
Billy J. Hunsinger - Urbana IL

The Board of Trustees of the University of Illinois - Urbana IL

G06G 702

364825

Method and apparatus for adaptive filtering a first signal to produce a second signal that approximates a desired signal including an acoustic charge transport type programmable transversal filter (PTF) having a number of taps where each tap corresponds to an associated delayed first signal and each tap having means for providing a variable tap weight to modify the filter response. The first signal is coupled to the PTF and the output of the PTF produces the second signal. A summer compares the output of the PTF and the desired signal to produce an error signal. A programmable delay line has time delays programmable to integer multiples of the PTF tap spacing to provide a delayed version of the first signal, and a multiplier multiplies the error signal and the delayed input of the programmable delay line to produce a gradient signal. The gradient signal is filtered with an analog lowpass filter to produce a filtered gradient signal which in turn is converted to a digital signal by a low bandwidth analog to digital converter. A microprocessor implements a filtered gradient algorithm to update the PTF filter tap, load the new tap weight into the PTF, and reconfigure the programmable delay line to produce a filtered gradient for another tap.

6987856, Jan 17, 2006

Nov 16, 1998

09/193058

Albert S. Feng - Champaign IL, US
Chen Liu - Urbana IL, US
Robert C. Bilger - Champaign IL, US
Douglas L. Jones - Champaign IL, US
Charissa R. Lansing - Champaign IL, US
William D. O'Brien - Champaign IL, US
Bruce C. Wheeler - Champaign IL, US

Board of Trustees of the University of Illinois - Urbana IL

H04R 3/00, H04R 25/00, H04B 15/00, G01S 3/80

381 92, 381 941, 381313, 367124

A desired acoustic signal is extracted from a noisy environment by generating a signal representative of the desired signal with a processor. The processor receives aural signals from two sensors each at a different location. The two inputs to the processor are converted from analog to digital format and then submitted to a discrete Fourier transform process to generate discrete spectral signal representations. The spectral signals are delayed by a number of time intervals in a dual delay line to provide a number of intermediate signals, each corresponding to a different spatial location relative to the two sensors. Locations of the noise source and the desired source are determined and the spectral content of the desired signal is determined from the intermediate signal corresponding to the noise source locations. Inverse transformation of the selected intermediate signal followed by digital to analog conversion provides an output signal representative of the desired signal. Techniques to localize multiple acoustic sources are also disclosed.

7577266, Aug 18, 2009

Jul 11, 2006

11/484838

Albert S. Feng - Champaign IL, US
Michael E. Lockwood - Champaign IL, US
Douglas L. Jones - Champaign IL, US
Charissa R. Lansing - Champaign IL, US
William D. O'Brien - Champaign IL, US
Bruce C. Wheeler - Champaign IL, US

The Board of Trustees of the University of Illinois - Urbana IL

H04R 25/00, H04R 3/00, H04R 11/04

381313, 381 92, 381356

System () is disclosed including an acoustic sensor array () coupled to processor (). System () processes inputs from array () to extract a desired acoustic signal through the suppression of interfering signals. The extraction/suppression is performed by modifying the array () inputs in the frequency domain with weights selected to minimize variance of the resulting output signal while maintaining unity gain of signals received in the direction of the desired acoustic signal. System () may be utilized in hearing, cochlear implants, speech recognition, voice input devices, surveillance devices, hands-free telephony devices, remote telepresence or teleconferencing, wireless acoustic sensor arrays, and other applications.

7613309, Nov 3, 2009

Nov 7, 2002

10/290137

Douglas L. Jones - Champaign IL, US
Michael E. Lockwood - Champaign IL, US
Robert C. Bilger - Champaign IL, US
Albert S. Feng - Champaign IL, US
Charissa R. Lansing - Champaign IL, US
William D. O'Brien - Champaign IL, US
Bruce C. Wheeler - Champaign IL, US
Mark Elledge - Austin TX, US
Chen Liu - Lisle IL, US

H04B 15/00

381 941, 381313, 381 92

System () is disclosed including an acoustic sensor array () coupled to processor (). System () processes inputs from array () to extract a desired acoustic signal through the suppression of interfering signals. The extraction/suppression is performed by modifying the array () inputs in the frequency domain with weights selected to minimize variance of the resulting output signal while maintaining unity gain of signals received in the direction of the desired acoustic signal. System () may be utilized in hearing aids, voice input devices, surveillance devices, and other applications.

2004021, Oct 28, 2004

Mar 24, 2004

10/807885

Ratnam Rama - Champaign IL, US
Albert Feng - Champaign IL, US
Douglas Jones - Champaign IL, US
Charissa Lansing - Champaign IL, US
William O'Brien - Champaign IL, US

H04R005/00, H03G003/00

381/063000, 381/056000

Included in the embodiments of the present invention is a technique to detect sound with a sensor to generate a corresponding sound signal and iteratively determine two or more values with a maximum likelihood function for evaluation of reverberation time. One of these values corresponds to a time constant parameter, and another of these values corresponds to a diffusive power parameter. An estimate representative of the reverberation time is further provided as a function of an order-statistics filter.

5621517, Apr 15, 1997

May 2, 1995

8/434873

Scott D. Jezwinski - Buffalo Grove IL
Douglas L. Jones - Champaign IL

Teradyne, Inc. - Boston MA

G01N 2188

356 731

An optical fiber test unit and a method of operating it. The test unit has a laser with a computer controlled excitation current input. To take a measurement, the laser is turned on for a period of time which is approximately equal to twice the propagation time through the fiber. The laser is then turned off and the reflected signal is recorded. This signal is displayed and contains discontinuities which indicate discontinuities in the fiber. The unit provides good dynamic range, but is able to make measurements more rapidly than a conventional OTDR. It is therefore well suited for scan testing of fiber optic cable bundles.

7206423, Apr 17, 2007

May 10, 2000

09/568435

Albert S. Feng - Champaign IL, US
Douglas Jones - Champaign IL, US
Bruce C. Wheeler - Champaign IL, US
Robert C. Bilger - Champaign IL, US
Charissa R. Lansing - Champaign IL, US
William D. O'Brien - Champaign IL, US

Board of Trustees of University of Illinois - Urbana IL

H04R 25/00

381312, 381315, 455100

Disclosed is a hearing aid that includes a first component operable to receive an input and a second component operable to provide an output to at least one ear of a user of the hearing aid. The first component and the second component are electrically coupled together by a closed electrical circuit including at least one electrical conduction pathway formed by skin of the user between the first component and the second component. An electrical signal is transmitted from the first component to the second component with the closed electrical circuit. Communication between the first and second components can be one-way or two-way.

2005024, Nov 10, 2005

May 7, 2004

10/841657

Bryan Nollett - Champaign IL, US
John Oliver - Chicago IL, US
Douglas Jones - Champaign IL, US

H04L025/49

375298000, 375146000

A method in a radio transmitter, the method including generating indices, for example, with an index generator (), encoding information by selecting different subsets of correlation-separable signals, for example, by multiplexing orthogonal spreading codes with indices input to a multiplexor (), encoding information by modulating at least some of the indices with a modulator (), and combining the information encoded by selecting the different subsets of correlation-separable signals with the information encoded by modulating at least some of the indices.

7688678, Mar 30, 2010

Oct 26, 2005

11/259619

Erik Larsen - Cambridge MA, US
Albert Feng - Champaign IL, US
Douglas L. Jones - Champaign IL, US

The Board of Trustees of the University of Illinois - Urbana IL

G01B 17/00

367 99, 702156

One embodiment of the invention includes a processing subsystem () responsive to the detection of sound coming from a room () to establish an acoustic impulse response for the room (), and determine a number of sound reflections corresponding to the impulse response. This subsystem () is further operable to determine volume of the room (), one or more dimensions of the room () and/or at least one absorption coefficient of a room boundary as a function of the sound reflections.