David S Lambert

US Patent:

8027486, Sep 27, 2011

Filed:

Oct 8, 2008

Appl. No.:

12/247757

Inventors:

Ashutosh Pandey - Murray UT, US
David Lambert - South Jordan UT, US

Assignee:

Clearone Communications, Inc. - Salt Lake City UT

International Classification:

H04B 15/00

US Classification:

381 93, 381 942, 381 943, 381 944

Abstract:

Disclosed herein are detectors of audio ringing feedback, that is decaying feedback with a gain of less than one, those detectors utilizing a repeated gain measurement that applied to a range of gain values characteristic of ringing-type feedback. Those gain measurements, while in the range, increase a probability measurement of feedback. When the probability of feedback reaches a threshold, a detection of feedback is made and feedback countermeasures, such as the application of a notch filter, may be applied. Optionally, the audio gain around likely frequencies of feedback may be enhanced for a time to increase the resolution of identification of a feedback frequency, which may be identified through an interpolative method. Repeated gain measurements may also identify building-type feedback. A ringing detector may include more than one range of detection, for example for building, strong-ringing and weak-ringing feedback.

US Patent:

8041664, Oct 18, 2011

Filed:

Jan 25, 2008

Appl. No.:

12/019970

Inventors:

David R. Lambert - San Diego CA, US

Assignee:

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

International Classification:

G06N 5/00

US Classification:

706 46, 706 45

Abstract:

Execution of functions by a non-human being is achieved by providing the non-human being with an I/O interface for receiving information, and permitting the non-human being to execute functions consistent with the abilities of the non-human being. An input/output interface is used to provide the non-human being with sensory information and to accept control information from the non-human being. An input/output processing system converts signals communicated through the input/output interface. An operation control interface is used for controlling the functions executed by the non-human being.

US Patent:

8090118, Jan 3, 2012

Filed:

Oct 8, 2008

Appl. No.:

12/247768

Inventors:

Ashutosh Pandey - Murray UT, US
David Lambert - South Jordan UT, US

Assignee:

ClearOne Communications, Inc. - Salt Lake City UT

International Classification:

H04B 15/00

US Classification:

381 93, 381 942, 381 943, 381 944

Abstract:

Disclosed herein are detectors of audio ringing feedback, that is decaying feedback with a gain of less than one, those detectors utilizing a repeated gain measurement that applied to a range of gain values characteristic of ringing-type feedback. Those gain measurements, while in the range, increase a probability measurement of feedback. When the probability of feedback reaches a threshold, a detection of feedback is made and feedback countermeasures, such as the application of a notch filter, may be applied. Optionally, the audio gain around likely frequencies of feedback may be enhanced for a time to increase the resolution of identification of a feedback frequency, which may be identified through an interpolative method. Repeated gain measurements may also identify building-type feedback. A ringing detector may include more than one range of detection, for example for building, strong-ringing and weak-ringing feedback.

US Patent:

8103019, Jan 24, 2012

Filed:

Oct 8, 2008

Appl. No.:

12/247747

Inventors:

Ashutosh Pandey - Murray UT, US
David Lambert - South Jordan UT, US

Assignee:

Clearone Comminications, Inc. - Salt Lake City UT

International Classification:

H04B 15/00

US Classification:

381 93, 381 941, 381 942, 381 943

Abstract:

Disclosed herein are detectors of audio ringing feedback, that is decaying feedback with a gain of less than one, those detectors utilizing a repeated gain measurement that applied to a range of gain values characteristic of ringing-type feedback. Those gain measurements, while in the range, increase a probability measurement of feedback. When the probability of feedback reaches a threshold, a detection of feedback is made and feedback countermeasures, such as the application of a notch filter, may be applied. Optionally, the audio gain around likely frequencies of feedback may be enhanced for a time to increase the resolution of identification of a feedback frequency, which may be identified through an interpolative method. Repeated gain measurements may also identify building-type feedback. A ringing detector may include more than one range of detection, for example for building, strong-ringing and weak-ringing feedback.

US Patent:

20130034241, Feb 7, 2013

Filed:

Jun 11, 2012

Appl. No.:

13/493950

Inventors:

Ashutosh Pandey - Murray UT, US
Darrin T. Thurston - Liberty UT, US
David K. Lambert - South Jordan UT, US
Tracy A. Bathurst - South Jordan UT, US

Assignee:

CLEARONE COMMUNICATIONS, INC. - Salt Lake City UT

International Classification:

H04R 3/00

US Classification:

381 92

Abstract:

Embodiments include methods and apparatuses for sensing acoustic waves for a conferencing application. A conferencing apparatus includes a plurality of directional microphones oriented to cover a corresponding plurality of direction vectors and disposed in a housing. An orientation sensor is configured to generate an orientation signal indicative of an orientation of the housing. A processor is operably coupled to the plurality of directional microphones and the orientation sensor. The processor is configured to automatically adjust a signal processing characteristic of one or more directional microphones of the plurality of directional microphones responsive to the orientation signal.

US Patent:

20130039504, Feb 14, 2013

Filed:

Jun 11, 2012

Appl. No.:

13/493921

Inventors:

Ashutosh Pandey - Murray UT, US
Darrin T. Thurston - Liberty UT, US
David K. Lambert - South Jordan UT, US
Tracy A. Bathurst - South Jordan UT, US

Assignee:

CLEARONE COMMUNICATIONS, INC. - Salt Lake City UT

International Classification:

G10K 11/16

US Classification:

381 711

Abstract:

Embodiments include methods and apparatuses for sensing acoustic waves for a conferencing application. A conferencing apparatus includes a plurality of microphones oriented to cover a corresponding plurality of direction vectors and to develop a corresponding plurality of microphone signals. A processor is operably coupled to the plurality of microphones. The processor is configured to perform a beamforming operation to combine the plurality of microphone signals to a plurality of combined signals that is greater in number than one and less in number than the plurality of microphone signals. The processor is also configured perform an acoustic echo cancelation operation on the plurality of combined signals to generate a plurality of combined echo-canceled signals and select one of the plurality of combined echo-canceled signals for transmission.

US Patent:

41337794, Jan 9, 1979

Filed:

Mar 23, 1976

Appl. No.:

5/669531

Inventors:

James A. Hellyer - Milford OH
David S. Lambert - Cincinnati OH
Robert Mermelstein - Cincinnati OH

Assignee:

The Procter & Gamble Company - Cincinnati OH

International Classification:

C11D 183
C11D 112
C11D 175

US Classification:

252547

Abstract:

A detergent composition containing a semi-polar nonionic detergent and an alkaline earth metal salt of an anionic detergent in a ratio of from 1:100 to 1:2. The composition is especially useful for the removal of greasy soils.

US Patent:

20170134849, May 11, 2017

Filed:

Jul 22, 2016

Appl. No.:

15/217904

Inventors:

- Salt Lake City UT, US
Darrin T. Thurston - Liberty UT, US
David K. Lambert - South Jordan UT, US
Tracy A. Bathurst - South Jordan UT, US

Assignee:

ClearOne, Inc. - Salt Lake City UT

International Classification:

H04R 1/40
H04R 3/00
G10L 21/0232
H04M 3/56
H04M 9/08

Abstract:

The present disclosure discloses a conferencing apparatus for a conference between a local end and a far end that combines a beamforming microphone array with an acoustic echo canceller. The apparatus includes a beamforming microphone array that further comprises a plurality of microphones wherein each microphone is configured to sense acoustic waves and the plurality of microphones are oriented to develop a corresponding plurality of microphone signals. The apparatus further includes a processor, memory, and storage where the processor is configured to execute program instructions. The processor performs a beamforming operation to create a plurality of combined signals. In addition, the processor performs an acoustic echo cancellation operation to generate a plurality of combined echo cancelled signals. Further, the processor performs a direction of arrival determination; and, selects, in response to the direction of arrival determination, one of the combined echo cancelled signals for transmission to the far end.