APPARATUS AND METHOD FOR REMOVING NOISE
First Claim
1. A noise removal apparatus including a first microphone mounted close to a speaker and at least two second microphones spaced a predetermined distance from the first microphone, comprising:
- a first and second frequency domain conversion units for converting a first and a second voice signal mixed with noise to frequency domain signals when the first and second voice signals are input from each of the microphones;
a bin comparator for determining if the current section is a voice section or a noise section by using each of the converted first and second voice signals;
a subtraction unit for subtracting a voice signal component from the converted second voice signal;
a noise clustering unit for determining, based on a result of the determination by the bin comparator, the noise type of the second voice signal, in which the voice signal component has been subtracted in the noise section; and
a noise removal algorithm unit for removing noise corresponding to the noise type from the converted first voice signal.
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Accused Products
Abstract
Disclosed is a method of efficiently removing noise. The method includes: deciding a noise section by attenuating characteristics of a voice in a voice signal mixed with noise; determining the type of the noise in the decided noise section; and removing the noise from the noise-mixed voice signal by using noise information obtained through the determination. A clustering method or a similarity level measurement method is used to determine the type of the noise. Even in a voice signal that is mixed with various types of noise, noise can be precisely removed and thus distortion of a sound quality can be minimized.
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Citations
12 Claims
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1. A noise removal apparatus including a first microphone mounted close to a speaker and at least two second microphones spaced a predetermined distance from the first microphone, comprising:
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a first and second frequency domain conversion units for converting a first and a second voice signal mixed with noise to frequency domain signals when the first and second voice signals are input from each of the microphones; a bin comparator for determining if the current section is a voice section or a noise section by using each of the converted first and second voice signals; a subtraction unit for subtracting a voice signal component from the converted second voice signal; a noise clustering unit for determining, based on a result of the determination by the bin comparator, the noise type of the second voice signal, in which the voice signal component has been subtracted in the noise section; and a noise removal algorithm unit for removing noise corresponding to the noise type from the converted first voice signal. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A noise removal method by a noise removal apparatus including a first microphone mounted close to a speaker and at least two second microphones spaced a predetermined distance from the first microphone, comprising the steps of:
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determining if the current section is a voice section or a noise section when the first and second voice signals are input from each of the microphones; subtracting a voice signal component from the converted second voice signal; based on a result of the determination, determining the noise type of the second voice signal, in which the voice signal component has been subtracted in the noise section; and removing noise corresponding to the noise type from the first voice signal. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification