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US 2011/0235822 A1Published application
Apparatus and method for reducing rear noise
OwnerJae-Hoon JEONG, Kyu-Hong Kim +2inventors
InventorsJae-Hoon JEONG, Kyu-Hong Kim, So-Young Jeong, Kwang-Cheol Oh
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Abstract
An apparatus and method for removing noise are provided. The apparatus includes an acoustic signal input unit configured to comprise three or more microphones including a first microphone as a reference microphone, a second microphone disposed at a position asymmetrical to the first microphone, and a third microphone disposed at a position symmetrical to the first microphone, and an acoustic signal processing unit configured to remove rear noise using acoustic signals received from the first microphone, the second microphone, and the third microphone.
Claims27
An apparatus to remove noise input from a rear direction, the apparatus comprising:
- an acoustic signal input unit configured to comprise three or more microphones including a first microphone as a reference microphone, a second microphone disposed at a position asymmetrical to the first microphone, and a third microphone disposed at a position symmetrical to the first microphone;
- and
- an acoustic signal processing unit configured to remove rear noise using acoustic signals received from the first microphone, the second microphone, and the third microphone.
A method of removing noise used in an apparatus to remove noise, the method comprising:
- receiving acoustic signals using an acoustic signal input unit configured to include a first microphone as a reference microphone, a second microphone disposed at a position symmetrical to the first microphone, and a third microphone disposed at a position asymmetrical to the first microphone;
- transforming a first acoustic signal received by the first microphone, a second acoustic signal received by the second microphone, and a third acoustic signal received by the third microphone, respectively, into acoustic signals in a frequency domain;
- compensating for a phase of the second acoustic signal with respect to sound waves input from a rear direction such that a first directivity direction in which a first phase difference between the first acoustic signal and the second acoustic signal is equal to or smaller than a first threshold value is approximate to a second directivity direction in which a second phase difference between the first acoustic signal and the third acoustic signal is equal to or smaller than a second threshold value;
- forming a first beam in such a direction that the first phase difference between the first acoustic signal and the second acoustic signal with the compensated phase is equal to or smaller than a predetermined threshold value;
- forming a second beam in such a direction that the second phase difference between the first acoustic signal and the third acoustic signal is equal to or smaller than the predetermined threshold value;
- and
- removing an acoustic signal input from the rear direction using the first beam and the second beam.
4 more elements
An apparatus to remove rear noise, the apparatus comprising:
- an acoustic signal input unit configured to comprise three or more microphones disposed on a surface which is linearly symmetrical and including one reference microphone, at least one microphone disposed at a position symmetrical to the reference microphone with respect to a line of symmetry of the linearly symmetrical surface, and at least one microphone disposed at a position which is not symmetrical to the reference microphone with respect to the line of symmetry;
- and
- an acoustic signal processing unit configured to remove the rear noise using acoustic signals input from the three or more microphones.
A method of removing rear noise, the method comprising:
- receiving signals from first, second, and third microphones on a shared surface, the second microphone being asymmetrical on the surface relative to the first microphone, and the third microphone being symmetrical on the surface relative to the first microphone;
- compensating a phase of a signal received by the second microphone according to a phase difference between the signal received by the first microphone and the signal received by the second microphone;
- and
- removing portions of the signals of which the phase difference between the signal received by the first microphone and the signal received by the second microphone is approximately the same as a phase difference between the signal received by the first microphone and the signal received by the third microphone.
1 more element
A device comprising:
- an apparatus to remove noise, the apparatus comprising:
- first, second, and third microphones provided on a shared surface to receive signals, the second microphone being asymmetrical on the surface relative to the first microphone, and the third microphone being symmetrical on the surface relative to the first microphone, and
- a controller to compensate a phase of a signal received by the second microphone according to a phase difference between the signal received by the first microphone, and the signal received by the second microphone to remove portions of the signals of which the phase difference between the signal received by the first microphone and the signal received by the second microphone is approximately the same as a phase difference between the signal received by the first microphone and the signal received by the third microphone.
Dependencies are inferred from the claim text.