Method of noise reduction in speech signals and an apparatus for performing the method
First Claim
1. A method of noise reduction in a speech signal, whereina first spectrum is generated on the basis of the speech signal, a second spectrum is generated as an estimate of the noise power spectrum, a third spectrum is generated by performing a spectral subtraction of said first and second spectra, and a resulting speech signal is generated on the basis of said third spectrum, and whenrin a model based representation describing the quasi-stationary part of the speech signal is generated on the basis of the third spectrum, said model based representation is manipulated, and said resulting speech signal is generated using said manipulated model based representation and a second signal derived from said speech signal.
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Abstract
A method and apparatus for noise reduction in a speech signal wherein a first spectrum is generated on the basis of the speech signal and a second spectrum is generated as an estimate of the noise power spectrum. A third spectrum is generated by performing a spectral subtraction of the first and second spectra, and a resulting speech signal is generated on the basis of the third spectrum. A model-based representation describing the quasi-stationary part of the speech signal is generated on the basis of the third spectrum. The model-based representation is manipulated, and the resulting speech signal is generated using the manipulated model-based representation and a second signal derived from the speech signal.
40 Citations
18 Claims
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1. A method of noise reduction in a speech signal, wherein
a first spectrum is generated on the basis of the speech signal, a second spectrum is generated as an estimate of the noise power spectrum, a third spectrum is generated by performing a spectral subtraction of said first and second spectra, and a resulting speech signal is generated on the basis of said third spectrum, and whenrin a model based representation describing the quasi-stationary part of the speech signal is generated on the basis of the third spectrum, said model based representation is manipulated, and said resulting speech signal is generated using said manipulated model based representation and a second signal derived from said speech signal.
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10. An apparatus for noise reduction in a speech signal, comprising
spectrum generating means (1,12) adapted to generate a first spectrum on the basis of the speech signal, noise spectrum generating means (2,10) adapted to generate a second spectrum as an estimate of the noise power spectrum, special subtraction means (5,15) adapted to generate a third spectrum by performing spectral subtraction of said first and second spectra, and signal generating means (9,19) adapted to generate a resulting speech signal on the basis of said third spectrum, said apparatus further comprising: -
model generating means (17) adapted to generate a model based representation describing the quasi-stationary part of the speech signal on the basis of the third spectrum, model manipulating means (18) adapted to manipulate said model based representation, a second signal generating means (14) adapted to derive a second signal from said speech signal, and wherein said signal generating means (19) generates the resulting speech signal using said manipulated model based representation and second signal. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification