Robust noise estimation
First Claim
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1. An enhancement system operative to estimate noise, comprising:
- a spectrum monitor operative to divide a portion of a received signal at more than one frequency resolution;
a plurality of logical devices programmed to track characteristics of an estimated noise in the received signal and modify a plurality of noise adaptation rates of portions of the received signal divided at a first frequency resolution; and
a limiting logic operative to constrain the modified plurality of noise adaptation rates.
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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
23 Claims
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1. An enhancement system operative to estimate noise, comprising:
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a spectrum monitor operative to divide a portion of a received signal at more than one frequency resolution; a plurality of logical devices programmed to track characteristics of an estimated noise in the received signal and modify a plurality of noise adaptation rates of portions of the received signal divided at a first frequency resolution; and a limiting logic operative to constrain the modified plurality of noise adaptation rates. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An enhancement system operative to estimate noise, comprising:
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a spectrum monitor operative to divide a portion of a received signal into wide bands and narrow bands; a first logic configured with an inverse square function and operative to modify a plurality of noise adaptation rates of portions of the received signal based on a variance; a second logic operative to modify the plurality of noise adaptation rates based on temporal characteristics; a peer pressure logic operative to modify the plurality of noise adaptation rates based on trend characteristics; and a temporal inertia logic operative to modify the plurality of noise adaptation rates based on predicted adaptation trends. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21)
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22. An enhancement method operative to estimate noise, comprising:
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dividing a portion of a received signal into wide bands and narrow bands; modifying a plurality of noise adaptation rates of portions of the received signal based on variances; modifying the plurality of noise adaptation rates based on temporal characteristics; and modifying the plurality of noise adaptation rates based on trend characteristics; where at least one of the steps of modifying based on variances, modifying based on temporal characteristics, or modifying based on trend characteristics is performed by a computer processor that executes instructions stored on a non-transitory computer-readable medium to modify the plurality of noise adaptation rates. - View Dependent Claims (23)
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Specification