Robust noise estimation
First Claim
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1. A system operative to estimate noise in a signal, comprising:
- a spectrum monitor to divide a portion of a frequency spectrum of the signal into a plurality of frequency bands, each frequency band containing one or more frequency bins;
one or more logical devices to track characteristics of a noise estimate for each of the frequency bands and to modify a plurality of noise estimate adaption rates, each corresponding to one of the plurality of frequency bands; and
a noise estimator to revise a noise estimate, for each of the frequency bins, responsive to the signal and to the noise estimate adaption rates of one or more frequency bands that contain the frequency bin.
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Abstract
An enhancement system improves the estimate of noise from a received signal. The system includes a spectrum monitor that divides a portion of the signal at more than one frequency resolution. Adaptation logic derives a noise adaptation factor of the received signal. A plurality of devices tracks the characteristics of an estimated noise in the received signal and modifies multiple noise adaptation rates. Weighting logic applies the modified noise adaptation rates derived from the signal divided at a first frequency resolution to the signal divided at a second frequency resolution.
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Citations
20 Claims
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1. A system operative to estimate noise in a signal, comprising:
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a spectrum monitor to divide a portion of a frequency spectrum of the signal into a plurality of frequency bands, each frequency band containing one or more frequency bins; one or more logical devices to track characteristics of a noise estimate for each of the frequency bands and to modify a plurality of noise estimate adaption rates, each corresponding to one of the plurality of frequency bands; and a noise estimator to revise a noise estimate, for each of the frequency bins, responsive to the signal and to the noise estimate adaption rates of one or more frequency bands that contain the frequency bin. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A system operative to estimate noise in a signal, comprising:
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a spectrum monitor configured to divide the signal into a plurality of frequency bands, where each frequency band comprises one or more frequency bins; a logical device configured to track noise characteristics of a frequency band of the plurality of frequency bands and to modify a noise estimate adaption rate associated with the frequency band; and a noise estimator configured to revise a noise estimate, for a frequency bin of the frequency band, in response to the noise estimate adaption rate of the frequency band. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A method of estimating noise, comprising:
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dividing a signal into a plurality of frequency bands, where each frequency band comprises one or more frequency bins; tracking noise characteristics of a frequency band of the plurality of frequency bands; modifying a noise estimate adaption rate associated with the frequency band; and revising a noise estimate, for a frequency bin of the frequency band, in response to the noise estimate adaption rate of the frequency band. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification