Selective shaping of communication signals
First Claim
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1. A method of angular discrimination between signals, the method comprising:
- sampling a plurality of signals with a plurality of signal sensors spatially separated from each other;
determining respective transform signals representative of each sampled signal;
if a difference between the transform signals in a given transform kernel bin is greater than a difference threshold, modifying a first transform signal by altering that kernel bin; and
inverse transforming the modified transform signal.
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Abstract
Angular discrimination between signals is described. Multiple signals are sampled with multiple signal sensors spatially separated from each other. Respective transform signals are determined that are representative of each sampled signal. If a difference between the transform signals in a given transform kernel bin is greater than a difference threshold, a first transform signal is modified by altering that kernel bin. Then the resulting modified transform signal is inverse transformed.
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Citations
20 Claims
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1. A method of angular discrimination between signals, the method comprising:
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sampling a plurality of signals with a plurality of signal sensors spatially separated from each other;
determining respective transform signals representative of each sampled signal;
if a difference between the transform signals in a given transform kernel bin is greater than a difference threshold, modifying a first transform signal by altering that kernel bin; and
inverse transforming the modified transform signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for suppressing off-axis noise in a sound-capture system for providing sound to a subject, the method comprising:
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collecting sound data from at least two spatially separated microphones;
transforming the collected sound data for each microphone to obtain a spectrum over values of frequency of the sound data for each microphone;
creating a comb of weights for each value of frequency, the weight being determined based upon a criterion applied to the phase angle associated with that frequency value;
obtaining a vector product of the comb of weights with the spectrum of a specified microphone of the at least two spatially separated microphones to form an output signal spectrum;
performing an inverse transform of the output signal spectrum to obtain an output signal;
broadcasting the output signal to the subject. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification