Communication system noise cancellation power signal calculation techniques
First Claim
1. A method for enhancing quality of a communication signal in a communication system, the communication signal including a speech component and a noise component, the method comprising:
- dividing the communication signal into a plurality of frequency band signals in the communication system;
calculating weighting values as a function of a weighting curve, the weighting curve approximating inverse proportionality to a spectrum shape of the speech component within the plurality of frequency band signals;
altering the frequency band signals in response to the weighting values to generate a plurality of weighted frequency band signals; and
combining the weighted frequency band signals to generate a communication signal with enhanced quality.
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Abstract
In order to enhance the quality of a communication signal derived from speech and noise, a filter divides the communication signal into a plurality of frequency band signals. A calculator generates a plurality of power band signals each having a power band value and corresponding to one of the frequency band signals. The power band values are based on estimating, over a time period, the power of one of the frequency band signals. The time period is different for different ones of the frequency band signals. The power band values are used to calculate weighting factors which are used to alter the frequency band signals that are combined to generate an improved communication signal.
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Citations
20 Claims
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1. A method for enhancing quality of a communication signal in a communication system, the communication signal including a speech component and a noise component, the method comprising:
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dividing the communication signal into a plurality of frequency band signals in the communication system; calculating weighting values as a function of a weighting curve, the weighting curve approximating inverse proportionality to a spectrum shape of the speech component within the plurality of frequency band signals; altering the frequency band signals in response to the weighting values to generate a plurality of weighted frequency band signals; and combining the weighted frequency band signals to generate a communication signal with enhanced quality. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An apparatus to enhance quality of a communication signal including a speech component and a noise component, the apparatus comprising:
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a division module to divide the communication signal into a plurality of frequency band signals; a calculation module to calculate weighting values as a function of a weighting curve, the weighting curve approximating inverse proportionality to a spectrum shape of the speech component within the plurality of frequency band signals; an alteration module to alter the frequency band signals in response to the weighting values to generate a plurality of weighted frequency band signals; and a combination module to combine the weighted frequency band signals to generate a communication signal with enhanced quality. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification