Apparatus and method for removing noise
First Claim
1. A noise removal apparatus to receive a signal comprising a first and a second voice signal and including a first microphone mounted close to a speaker and at least one second microphone spaced a predetermined distance from the first microphone, comprising:
- a first and second frequency domain conversion units to convert the first and the 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 to determine a voice section and a noise section using each of the converted first and second voice signals and to determine whether a current section of the signal is the voice section or the noise section using each of the converted first and second voice signals;
a subtraction unit to subtract a voice signal component from the converted second voice signal;
a noise clustering unit to determine, 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 to remove noise corresponding to the noise type from the converted first voice signal.
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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.
12 Citations
12 Claims
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1. A noise removal apparatus to receive a signal comprising a first and a second voice signal and including a first microphone mounted close to a speaker and at least one second microphone spaced a predetermined distance from the first microphone, comprising:
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a first and second frequency domain conversion units to convert the first and the 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 to determine a voice section and a noise section using each of the converted first and second voice signals and to determine whether a current section of the signal is the voice section or the noise section using each of the converted first and second voice signals; a subtraction unit to subtract a voice signal component from the converted second voice signal; a noise clustering unit to determine, 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 to remove 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 that receives a signal comprising a first and a second voice signal and that includes a first microphone mounted close to a speaker and at least one second microphone spaced a predetermined distance from the first microphone, the method comprising:
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converting the first and the second voice signal mixed with noise to frequency domain signals when the first and second voice signals are input from each of the microphones; determining a voice section and a noise section using each of the converted first and second voice signals and determining if a current section of the signal is the voice section or the noise section; 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