APPARATUS AND METHOD FOR REDUCING NOISE USING COMPLEX SPECTRUM
First Claim
1. An apparatus for reducing noise to extract a target signal contained in input signals received through at least two microphones, the apparatus comprising:
- a first noise estimator configured to estimate first noise using a filter comprising a filter learning coefficient configured to be updated according to a prior signal-to-noise ratio.
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Abstract
An apparatus and method reduce noise in a complex spectrum domain to extract a target signal from input signals containing noise and target speech. Noise estimation may be performed through a filter with a filter learning coefficient that is updated according to a prior-signal-to-noise ratio (prior-SNR). Also, noise estimation accuracy may be improved by using confidential weighted scores. The target signal may be extracted by representing candidates of the target signal as at least two circles in the complex spectrum domain using the estimated noise and then geometrically calculating the intersections of the circles.
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Citations
15 Claims
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1. An apparatus for reducing noise to extract a target signal contained in input signals received through at least two microphones, the apparatus comprising:
a first noise estimator configured to estimate first noise using a filter comprising a filter learning coefficient configured to be updated according to a prior signal-to-noise ratio. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An apparatus for reducing noise to extract a target signal included in input signals received through at least two microphones, the apparatus comprising:
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a first noise estimator configured to estimate first noise using an adaptive blocking matrix; and a second noise estimator configured to estimate second noise using; the first noise; and a confidential weighted score that is defined based on a signal-to-noise ratio. - View Dependent Claims (8, 9, 10)
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11. A method of reducing noise to extract a target signal included in input signals received through at least two microphones, the method comprising:
estimating first noise through a filter comprising a filter learning coefficient that is updated according to an adaptive blocking matrix or a prior signal-to-noise ratio. - View Dependent Claims (12, 13, 14, 15)
Specification