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| Method and device for cancelling stereophonic echo with frequency domain filtering |
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| Method and apparatus for clock synchronization using quantum mechanical non-locality effects |
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| Method and apparatus for the modeling and synthesis of harmonic distortion |
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| Frequency dependent excursion limiter |
| OF THE ILLUSTRATED EMBODIMENT Referring now to the drawings, FIGS. 1 and 2 illustrate a technique ... |
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| Chopper-stabilized operational transconductance amplifier |
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| Scrambling type method and apparatus for video transmission/receipt |
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| Control circuit for a matrixed four channel audio reproducing system |
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Systems and methods for interference-suppression with directional sensing patterns
| Details |
Inventors: Feng, Albert S.; Lockwood, Michael E.; Jones, Douglas L.; Bilger, legal representative, Carolyn J.; Lansing, Charissa R.; O'Brien, William D.; Wheeler, Bruce C.; Bilger, deceased, Robert C.;
Assignee: Board of Trustees for the University of Illinois (Urbana, IL)
Primary Examiner: Tran; Sihn
Assistant Examiner: Ensey; Brian
Attorney, Agent or Firm: Krieg DeVault LLP Paynter; L. Scott
System (10) is disclosed including an acoustic sensor array (20) coupled to processor (42). System (10) processes inputs from array (20) to extract a desired acoustic signal through the suppression of interfering signals. The extraction/suppression is performed by modifying the array (20) 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 (10) 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. |
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DETAILED DESCRIPTION One form of the present invention includes a unique signal processing technique using two or more detectors.
Other forms include unique devices and methods for processing signals.
A further embodiment of the present invention includes a system with a number of directional sensors and a processor operable to execute a beamforming routine with signals received from the sensors.
The processor is further operable to provide an output signal representative of a property of a selected source detected with the sensors.
The beamforming routine may be of a fixed or adaptive type.
In another embodiment, an arrangement includes a number of sensors each responsive to detected sound to provide a corresponding number of representative signals.
These sensors each have a directional reception pattern with a maximum response direction and a minimum response direction that differ in relative sound reception level by at least 3 decibels at a selected frequency.
A first axis coincident with the maximum response direction of a first one of the sensors intersects a second axis coincident with the maximum response direction of a second one of those signals at an angle in a range of about 10 degrees through about 180 degrees.
A processor is also included that is operable to execute a beamforming routine with the sensor signals and generate an output signal representative of a selected sound source.
An output device may be included that responds to this output signal to provide an output representative of sound from the selected source.
In one form, the sensors, processor, and output device belong to a hearing system.
Still another embodiment includes: providing a number of directional sensors each operable to detect sound and provide a corresponding number of sensor signals.
The sensors each have a directional response pattern oriented in a predefined positional relationship with respect to one another.
The sensor signals are processed with a number of signal weights that are adaptively recalculated from time-to-time
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