Method and apparatus for estimating noise by using harmonics of voice signal
AssigneesSamsung Electronics Co., Ltd., Korea University Industrial & Academic Collaboration Foundation
InventorsHyun-Soo Kim, Hanseok Ko, Sung-Joo Ahn, Jounghoon Beh, Hyun-Jin Yoon
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Abstract
Disclosed is a method and an apparatus for estimating noise included in a sound signal during sound signal processing. The method includes estimating harmonics components in a frame of an input sound signal; using the estimated harmonics components, computing a Voice Presence Probability (VPP) on the frame of the input sound signal; determining a weight of an equation necessary to estimate a noise spectrum, depending on the computed VPP; and using the determined weight and the equation necessary to estimate a noise spectrum, estimating the noise spectrum, and updating the noise spectrum.
Claims9
A method for estimating noise by using harmonics of a voice signal, the method comprising the steps of:
- (a) estimating harmonic components in a frame of an input sound signal;
- (b) using the estimated harmonic components, computing a Voice Presence Probability (VPP) on the frame of the input sound signal;
- (c) determining a weight of an equation necessary to estimate a noise spectrum, depending on the computed VPP utilizing:
- N(k,t)=α(k,t)N(k,t−1)+(1−α(k,t))Y(k,t),
- where N(k, t) represents the noise spectrum, Y(k, t) represents a spectrum of the input sound signal, k represents a frequency index, t represents a frame index and α(k, t) represents the weight;
- and
- (d) estimating the noise spectrum by using the determined weight and the equation, and updating the noise spectrum.
An apparatus for estimating noise by using harmonics of a voice signal, the apparatus comprising:
- a harmonics estimation unit for estimating harmonic components in a frame of an input sound signal, and for outputting the estimated harmonic components;
- a voice estimation unit for using the estimated harmonic components, computing a Voice Presence Probability (VPP) on the frame of the input sound signal, and outputting the computed VPP;
- a weight determination unit for determining a weight of an equation necessary to estimate a noise spectrum, depending on the computed VPP, and for outputting the determined weight utilizing:
- N(k,t)=α(k,t)N(k,t−1)+(1−α(k,t))Y(k,t),
- where N(k, t) represents the noise spectrum, Y(k, t) represents a spectrum of the input sound signal, k represents a frequency index, t represents a frame index and α(k, t) represents the weight;
- and
- a noise spectrum update unit for estimating the noise spectrum by using the determined weight and the equation, and updating the noise spectrum.
Dependencies are inferred from the claim text.