KR20170032732A - Active noise cancelling apparatus - Google Patents

Active noise cancelling apparatus Download PDF

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Publication number
KR20170032732A
KR20170032732A KR1020150130486A KR20150130486A KR20170032732A KR 20170032732 A KR20170032732 A KR 20170032732A KR 1020150130486 A KR1020150130486 A KR 1020150130486A KR 20150130486 A KR20150130486 A KR 20150130486A KR 20170032732 A KR20170032732 A KR 20170032732A
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KR
South Korea
Prior art keywords
noise
voice signal
signal
microphone
attenuator
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KR1020150130486A
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Korean (ko)
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KR101822821B1 (en
Inventor
박영철
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한국외국어대학교 연구산학협력단
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Priority to KR1020150130486A priority Critical patent/KR101822821B1/en
Publication of KR20170032732A publication Critical patent/KR20170032732A/en
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    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R3/00—Circuits for transducers, loudspeakers or microphones
    • H04R3/002—Damping circuit arrangements for transducers, e.g. motional feedback circuits

Abstract

The present invention relates to an active noise attenuator, and more particularly, to an active noise attenuator that records noise in an environment where repeated noises occur and removes noise in the time domain using recorded noise, And the time delay due to the filtering can be prevented.

Description

[0001] The present invention relates to an active noise cancellation apparatus,

The present invention relates to a noise attenuation technique, and more particularly to an active noise attenuator.

Korean Patent No. 10-1002640 (Dec. 14, 2010) detects an external noise and outputs an active noise control function that outputs a noise attenuation signal having a frequency of an opposite phase to the detected noise frequency And a Bluetooth control device.

The basic principle of such a conventional active noise attenuator is to attenuate the original noise by collecting the signal to be attenuated, reversing the phase thereof, and then generating the signal again. Here, the task of separating the noise to be attenuated and the other sound is mainly performed through filtering in the frequency domain. However, the method of attenuating the noise only by the frequency characteristic has a disadvantage of distorting the sound, not the noise.

In addition, there is a fundamental restriction that the noise attenuation performance is deteriorated due to a minute time delay required for processing the filtering operation, and there is a limitation in the operation of separating the noise to be attenuated due to various external sounds varying with time.

Accordingly, the present inventors have found that the attenuation characteristic is improved compared with the conventional noise attenuation technique in which noises are repeatedly recorded in the environment where specific noises occur repeatedly, and noise is removed in the time domain by using recorded noises, We have been studying active noise attenuation technology which is superior and can prevent time delay due to filtering.

Korean Patent No. 10-1002640 (Dec. 14, 2010)

An object of the present invention is to provide an active noise attenuator capable of recording noise in an environment in which specific noises are repeatedly generated and removing noise in a time domain by using recorded noises.

According to an aspect of the present invention, an active noise attenuator includes a microphone for receiving a voice signal; A speaker for outputting a voice signal; A noise recording button for selecting to start recording the noise; A memory unit for storing a noise signal to be recorded; When a user clicks a noise recording button in an environment in which a specific noise is repeatedly generated, a voice signal input through the microphone is stored in the memory unit for a predetermined time to record noise, A control unit for attenuating a noise signal stored in the memory unit from the mixed voice signal and outputting a user voice signal whose noise is attenuated; And the like.

According to a further aspect of the present invention, the control unit includes: a baseband signal converter for converting a voice signal inputted through a microphone into a baseband signal; When a user clicks a noise recording button in an environment in which a specific noise is repeatedly generated, a voice signal input through the microphone and converted into a baseband signal by the baseband signal converting unit is stored in the memory unit for a predetermined time, A recording unit for recording the recording medium; A noise attenuator for attenuating a noise signal stored in the memory unit from a voice signal input through the microphone and mixed with a user voice and a noise converted into a baseband signal by the baseband signal converting unit; A voice output unit for outputting a user voice signal whose noise is attenuated by the noise attenuator to the speaker or the communication terminal; .

According to a further aspect of the present invention, there is provided a sound level / phase adjusting unit for adjusting a magnitude and phase of a noise desired to be attenuated by the control unit; And further comprising:

The present invention records noise in an environment in which a specific noise is repeatedly generated and removes noise in a time domain by using recorded noise, thereby achieving excellent attenuation characteristics as compared with a conventional noise attenuation technique for filtering noise in a frequency domain to remove noise , And the time delay due to the filtering can be prevented.

1 is a block diagram showing a configuration of an embodiment of an active noise attenuator according to the present invention.
2 is a flowchart illustrating an example of noise reduction operation of the active noise attenuator according to the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the like elements throughout.

In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

The terms used throughout the specification of the present invention have been defined in consideration of the functions of the embodiments of the present invention and can be sufficiently modified according to the intentions and customs of the user or operator. It should be based on the contents of.

1 is a block diagram showing a configuration of an embodiment of an active noise attenuator according to the present invention. 1, the active noise attenuator 100 according to this embodiment includes a microphone 110, a speaker 120, a sound recording button 130, a memory unit 140, a controller 150 ).

The microphone 110 receives a voice signal. For example, when the active noise attenuator 100 is implemented as a headset, the microphone 110 may be an external microphone.

The speaker 120 outputs a voice signal. For example, when the active noise attenuator 100 is implemented as a headset, the speaker 120 may be an ear speaker.

The noise recording button 130 is selected to start the noise recording. For example, when the active noise attenuator 100 is implemented in the form of a headset, the noise recording button 130 is installed at a specific portion of the main body supporting the microphone 110 and the speaker 120, And a button switch for turning on / off the recording.

The memory unit 140 stores a noise signal to be recorded. For example, the memory unit 140 may be a non-volatile memory such as an EEPROM or a flash memory.

The controller 150 stores the voice signal inputted through the microphone 110 in the memory unit 130 for a specific time when the user clicks the noise recording button 130 in an environment where specific noise is repeatedly generated And outputs a user's voice signal in which the noise is attenuated by attenuating the noise signal stored in the memory unit 140 from the voice signal mixed with the user's voice and noise inputted through the microphone 110. [

For example, the noise generated by the engine or the prime mover has a constant repetitive pattern, and the user can arbitrarily create an environment in which such a specific noise is repeatedly generated.

In an environment in which a specific noise is repeatedly generated, the noise is input through the microphone 110. When the user clicks the noise recording button 130, the controller 150 controls the noise inputted through the microphone 110 (130) to record noise.

When a voice signal mixed with a user voice and a noise is input through the microphone 110 in a state where noise is repeatedly generated in an environment where a specific noise is repeatedly generated, the controller 150 uses the noise signal stored in the memory unit 140 And outputs a user voice signal in which the noise is attenuated by attenuating the noise signal to the speaker 120 or the communication terminal (not shown).

According to a further aspect of the present invention, the control unit 150 includes a baseband signal converting unit 151, a sound performing unit 152, a sound attenuating unit 153, and a sound output unit 154 can do.

The baseband signal converting unit 151 converts a voice signal inputted through the microphone 110 into a baseband signal. Baseband is the frequency band used to modulate a particular carrier.

When the user clicks the noise recording button 130 in the environment in which a specific noise is repeatedly generated, the recording performance unit 152 receives the sound through the microphone 110, and the baseband signal conversion unit 151 converts the baseband signal The voice signal converted into the signal is stored in the memory unit 140 for a specific time to record the noise.

The noise attenuator 153 receives the voice signal input through the microphone 110 and mixed with the user voice and the noise converted into the baseband signal by the baseband signal converter 151, Thereby attenuating the noise signal stored in the memory.

The voice output unit 154 outputs a user voice signal whose noise is attenuated by the sound attenuation unit 153 to the speaker 120 or the communication terminal 200. In this case, the communication terminal may be a cellular phone or the like, and the voice output unit 154 may be configured to output a user voice signal whose noise is attenuated in a wired manner using a wireless system such as Bluetooth or a wired connector to the communication terminal .

According to a further aspect of the present invention, the controller 150 may further include a noise magnitude / phase adjuster 155. The noise magnitude / phase adjuster 155 adjusts the magnitude and phase of the noise to be attenuated.

(T) recorded by the control unit 150 and stored in the memory unit 130 as n i (t), a voice signal mixed with a user voice and a noise input through the microphone 110 as h i when a voice signal is called the s i (t), the noise attenuation user voice signals h 0 (t) to be output are as follows.

h 0 (t) = h i (t) + c · n i (tt d) = s i (t)

Here, the variables c and t d represent the magnitude and phase change of the noise n i (t), respectively, and the clockwise phasor of the sinusoidal phase in the complex domain can be expressed as follows.

c · exp (-jwt d )

In this case, we can optimize h 0 (t) by obtaining optimal c and t d with the lowest correlation between h i (t) and n i (t).

The noise magnitude / phase adjuster 155 adjusts the magnitude and phase of the noise with the optimal c and t d with the lowest correlation between h i (t) and n i (t) Signal.

According to the present invention, the noise can be recorded in an environment in which a specific noise is repeatedly generated, and the noise can be removed in the time domain using the recorded noise, And the time delay due to the filtering can be prevented.

The noise attenuation operation of the active noise attenuator according to the present invention as described above will be described with reference to FIG. 2 is a flowchart illustrating an example of noise reduction operation of the active noise attenuator according to the present invention.

First, in step 210, when the user clicks the noise recording button in the environment where the specific noise is repeatedly generated by the active noise attenuator, the sound signal inputted through the microphone is stored in the memory for a predetermined time to record the noise.

Then, in step 220, the active noise attenuator attenuates the noise signal stored in the memory unit from the voice signal mixed with the user voice and the noise input through the microphone, thereby outputting the user voice signal whose noise is attenuated.

According to the present invention, the noise can be recorded in an environment in which a specific noise is repeatedly generated, and the noise can be removed in the time domain using the recorded noise, And the time delay due to the filtering can be prevented. Therefore, the object of the present invention can be achieved.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. .

INDUSTRIAL APPLICABILITY The present invention is industrially applicable in the field of sound attenuation technology and its application technology.

100: active noise attenuator
110: microphone
120: Speaker
130: Noise recording button
140:
150:
151: Baseband signal converting unit
152:
153: Noise reduction unit
154: Audio output unit
155: Noise level / phase adjustment section

Claims (3)

A microphone for receiving a voice signal;
A speaker for outputting a voice signal;
A noise recording button for selecting to start recording the noise;
A memory unit for storing a noise signal to be recorded;
When a user clicks a noise recording button in an environment in which a specific noise is repeatedly generated, a voice signal input through the microphone is stored in the memory unit for a predetermined time to record noise, A control unit for attenuating a noise signal stored in the memory unit from the mixed voice signal and outputting a user voice signal whose noise is attenuated;
Comprising an active noise attenuator. The method according to claim 1,
Wherein the control unit comprises:
A baseband signal converter for converting a voice signal inputted through a microphone into a baseband signal;
When a user clicks a noise recording button in an environment in which a specific noise is repeatedly generated, a voice signal input through the microphone and converted into a baseband signal by the baseband signal converting unit is stored in the memory unit for a predetermined time, A recording unit for recording the recording medium;
A noise attenuator for attenuating a noise signal stored in the memory unit from a voice signal input through the microphone and mixed with a user voice and a noise converted into a baseband signal by the baseband signal converting unit;
A voice output unit for outputting a user voice signal whose noise is attenuated by the noise attenuator to the speaker or the communication terminal;
Active noise attenuator included. 3. The method of claim 2,
Wherein the control unit comprises:
A noise magnitude / phase adjuster for adjusting the magnitude and phase of the desired noise to be attenuated;
Further included active noise attenuator.
KR1020150130486A 2015-09-15 2015-09-15 Active noise cancelling apparatus KR101822821B1 (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107705797A (en) * 2017-10-18 2018-02-16 安徽质在智能科技有限公司 A kind of intelligent mobile communication system and operating method
KR20190113435A (en) 2018-03-28 2019-10-08 두산중공업 주식회사 Apparatus and Method for recognizing speech using Noise Information Adapted to Working Environment
KR20210026239A (en) * 2019-08-29 2021-03-10 고려대학교 산학협력단 Method and device for preventing unauthorized audio recording, and method and device for restoring original recording

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101002640B1 (en) 2008-04-29 2010-12-20 대성전기공업 주식회사 A bluetooth control device having a active noise control ability

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8325934B2 (en) * 2007-12-07 2012-12-04 Board Of Trustees Of Northern Illinois University Electronic pillow for abating snoring/environmental noises, hands-free communications, and non-invasive monitoring and recording

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101002640B1 (en) 2008-04-29 2010-12-20 대성전기공업 주식회사 A bluetooth control device having a active noise control ability

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107705797A (en) * 2017-10-18 2018-02-16 安徽质在智能科技有限公司 A kind of intelligent mobile communication system and operating method
CN107705797B (en) * 2017-10-18 2020-12-22 四川蜀天信息技术有限公司 Intelligent mobile communication system and operation method
KR20190113435A (en) 2018-03-28 2019-10-08 두산중공업 주식회사 Apparatus and Method for recognizing speech using Noise Information Adapted to Working Environment
KR20210026239A (en) * 2019-08-29 2021-03-10 고려대학교 산학협력단 Method and device for preventing unauthorized audio recording, and method and device for restoring original recording

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