Mathew J Abraham

US Patent:

7227959, Jun 5, 2007

Filed:

Feb 25, 2004

Appl. No.:

10/786697

Inventors:

Mathew T. Abraham - Chicago IL, US

Assignee:

Shure Incorporated - Evanston IL

International Classification:

H04R 27/00
H04B 15/00

US Classification:

381 83, 381 93, 381 943

Abstract:

The present invention provides method and apparatus that improve processing of acoustic signals by reducing acoustic feedback in an acoustic system. An aspect of the invention is a multi-channel digital feedback reducer (DFR) system that comprises a plurality of channel elements. Each channel element comprises a notch filter configuration having an adaptive notch filter and an operative notch filter. The operative notch filter processes a signal received from an acoustic input device and provides the processed signal to an acoustic output device, in which acoustic feedback between the acoustic input device and the acoustic output device is ameliorated. If acoustic feedback is detected by a channel element, the channel element informs other channel elements of the multi-channel DFR system about the detected feedback to ensure that all channel elements may incorporate the same notch filters. During the notification, the other channel elements may continue searching for feedback on the associated channels.

US Patent:

20220240008, Jul 28, 2022

Filed:

Jan 27, 2022

Appl. No.:

17/586213

Inventors:

- Niles IL, US
John Casey Gibbs - Chicago IL, US
Michael Ryan Lester - Colorado Springs CO, US
Mathew T. Abraham - Colorado Springs CO, US

International Classification:

H04R 3/00

Abstract:

Hybrid audio beamforming systems and methods with narrower beams and improved directivity are provided. The hybrid audio beamforming system includes a time domain beamformer for processing upper frequency band signals of an audio signal using a time domain beamforming technique, and a frequency domain beamformer for processing groups of lower frequency band signals of the audio signal using frequency domain beamforming techniques.

US Patent:

20230063105, Mar 2, 2023

Filed:

Oct 26, 2022

Appl. No.:

18/049900

Inventors:

- Niles IL, US
John Casey Gibbs - Chicago IL, US
Mathew T. Abraham - Colorado Springs CO, US

International Classification:

H04R 1/40
H04R 3/00
H04R 3/04
H04R 19/04

Abstract:

Embodiments include a planar microphone array comprising a first linear array arranged along a first axis; and a second linear array arranged along a second axis orthogonal to the first axis, a center of the second linear array aligned with a center of the first linear array, wherein each of the first linear array and the second linear array comprises a corresponding first set of microphone elements nested within a corresponding second set of microphone elements, and each set of microphone elements is arranged symmetrically about the center of the corresponding linear array, such that the first linear array and the second linear array are configured to generate a steerable directional polar pattern, the microphone elements of each linear array configured to capture audio signals. Embodiments also include a microphone system comprising the same and a method performed by processor(s) to generate an output signal for the same.

US Patent:

20200037068, Jan 30, 2020

Filed:

Oct 7, 2019

Appl. No.:

16/594927

Inventors:

- Niles IL, US
Brent Robert Shumard - Mount Prospect IL, US
David Grant Cason - Palatine IL, US
Andrey Ash - Morton Grove IL, US
Jordan Schultz - Chicago IL, US
Mathew T. Abraham - Colorado Springs CO, US
Avinash K. Vaidya - Riverwoods IL, US

International Classification:

H04R 1/40
H04R 3/00

Abstract:

A microphone module comprises a housing, an audio bus, and a first plurality of microphones in communication with the audio bus. The microphone module further comprises a module processor in communication with the first plurality of microphones and the audio bus. The module processor is configured to detect the presence of an array processor in communication with the audio bus, detect the presence of a second microphone module in communication with the audio bus, and configure the audio bus to pass audio signals from both the first plurality of microphones and the second microphone module to the array processor.

US Patent:

20190373362, Dec 5, 2019

Filed:

May 10, 2019

Appl. No.:

16/409239

Inventors:

- Niles IL, US
John Casey Gibbs - Chicago IL, US
Mathew T. Abraham - Colorado Springs CO, US

International Classification:

H04R 1/40
H04R 19/04
H04R 3/00
H04R 3/04

Abstract:

Embodiments include a microphone array with a plurality of microphone elements comprising a first set of elements arranged along a first axis, comprising at least two microphone elements spaced apart by a first distance; a second set of elements arranged along the first axis, comprising at least two microphone elements spaced apart by a second, greater distance, such that the first set is nested within the second set; a third set of elements arranged along a second axis orthogonal to the first axis, comprising at least two microphone elements spaced apart by the second distance; and a fourth set of elements nested within the third set along the second axis, comprising at least two microphone elements spaced apart by the first distance, wherein each set includes a first cluster of microphone elements and a second cluster of microphone elements spaced apart by the specified distance.

US Patent:

20180227666, Aug 9, 2018

Filed:

Jan 25, 2018

Appl. No.:

15/880151

Inventors:

- Niles IL, US
Brent Robert Shumard - Mount Prospect IL, US
David Grant Cason - Palatine IL, US
Andrey Ash - Morton Grove IL, US
Jordan Schultz - Chicago IL, US
Mathew T. Abraham - Colorado Springs CO, US
Avinash K. Vaidya - Riverwoods IL, US

International Classification:

H04R 1/40

Abstract:

A microphone module comprises a housing, an audio bus, and a first plurality of microphones in communication with the audio bus. The microphone module further comprises a module processor in communication with the first plurality of microphones and the audio bus. The module processor is configured to detect the presence of an array processor in communication with the audio bus, detect the presence of a second microphone module in communication with the audio bus, and configure the audio bus to pass audio signals from both the first plurality of microphones and the second microphone module to the array processor.