Solid angle cross-talk cancellation for beamforming arrays
First Claim
1. A system for improving an output of a transducer signal comprising:
- at least one transducer;
a beamformer;
at least one chosen, fixed input beam;
an algorithmic block producing a desired resulting output beam having a narrowed on-axis beamwidth; and
an output signal comprising the desired resulting output beam having a narrowed beamwidth.
1 Assignment
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Accused Products
Abstract
A non-adaptive system and method for improving on-axis pickup of a signal by a transducer, such as a microphone, where the signal received by the transducer is can be spatially represented as lobes or beams, the on-axis pickup being improved by removing the side portions of the beams. The input signal, or signals, has a predetermined location, whether that is at zero degrees on a polar plot or elsewhere, and the system produces an output beamwidth as narrow as possible. The input beams of the signal (or signals) received are processed to produce cancellation beams, and the cancellation beams are then steered, using phase or time delays, to overlap with the desired input beams outside of the desired output beamwidth. Via superpositioning, the cancellation beams are then subtracted from the desired input beams resulting in an output beam with a narrower beamwidth, and thus improving on-axis pickup by automatically excluding portions of the beam considered likely to be interfering sources or generally undesirable signal.
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Citations
40 Claims
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1. A system for improving an output of a transducer signal comprising:
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at least one transducer;
a beamformer;
at least one chosen, fixed input beam;
an algorithmic block producing a desired resulting output beam having a narrowed on-axis beamwidth; and
an output signal comprising the desired resulting output beam having a narrowed beamwidth. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 39, 40)
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14. A method for narrowing the desired pickup of a desired signal comprising the steps of:
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determining a location on a spatial representation of a desired main beam containing the desired signal; and
and narrowing the width of the desired beam of the desired signal.
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25. A non-continuously adaptive method for improving the on-axis pickup of a desired input signal comprising the steps of:
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determining location on a spatial representation of a desired main beam of the desired input signal;
determining a desired resulting beamwidth of a desired resulting beam;
narrowing the beamwidth of the desired main beam by removing an area of the spatial representation of the desired main beam;
producing a desired resulting output beam; and
producing an output signal from the desired resulting output beam.
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38. A computer-readable medium having computer-executable instructions for performing steps comprising:
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locating a spatial representation of a desired main beam of a desired input signal;
producing a cancellation beam;
steering the central axis of the cancellation beam a phase specified by the desired resulting beamwidth of the narrowed desired beam; and
subtracting the cancellation beam from the desired main beam via superpositioning.
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Specification