KR101519430B1 - A sound amplifying device and the sound amplyfying method - Google Patents

Abstract

The present invention relates to a sound amplifying device comprising: a housing on which an external device is placed; a sound receiving unit disposed inside the housing to receive sound generated from the outside; an amplification unit for amplifying the sound received by the sound receiving unit; and an output unit for outputting the sound amplified by the amplification unit to the outside.

Description

[0001] The present invention relates to a sound amplifying device and a sound amplifying method,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sound amplification apparatus and a sound amplification method, and more particularly, to a sound amplification method and an amplification apparatus that receive sound output from an external device such as a cellular phone, amplify the sound, and send the amplified sound.

A mobile phone is an electronic device capable of communicating with the other party regardless of time or space. In addition, the mobile phone has a function of downloading a music file in real time from a web server, receiving an image having audio, receiving a game program, etc. To multi-media computer equipment.

As described above, the voice or audio signals output when executing voice, movie, and various game programs for telephone conversation with the other party are diversified as the service provided by the portable telephone changes, (speaker) or earphone (earphone).

Therefore, in order to listen to voice or audio, the user must close the earphone or insert the earphone.

 In other words, in order to listen to a voice or a movie for a telephone conversation with a partner and a voice outputted when a game program is executed, the conventional portable telephone has a drawback in that it is necessary to close the ear of the portable telephone or to connect the earphone In addition, there is a problem that an individual or a plurality of people can not hear a voice with a presence.

In order to solve such a problem, a conventional technique has been proposed in which a sound transmitted from a cellular phone is output to an external speaker by using a Bluetooth connection, Near Field Communication (NFC), Near Field Audio A method is provided.

However, there has been a problem in that an initial setting process such as pairing is required for a connection method using Bluetooth or NF, and there is a problem in that a near field audio technology in which a vibration of a voice coil motor of a cellular phone is received and reproduced There is a problem in that, when a speaker of a cellular phone is employed as a piezoelectric speaker, it can not be reproduced from the outside.

SUMMARY OF THE INVENTION The present invention has been conceived to solve the above-mentioned problems, and it is an object of the present invention to provide a sound amplification method and sound amplification method capable of simply enjoying a sound externally rich by directly receiving and amplifying sound output from an external device, Device.

The present invention also provides a sound amplification method and a sound amplification apparatus capable of listening to music and the like by using an external speaker and charging the mobile phone.

It is also an object of the present invention to provide a sound amplification method and a sound amplification apparatus capable of amplifying and reproducing sound even when a piezoelectric speaker is used as an output means of an external device such as a cellular phone.

According to an aspect of the present invention, A sound receiving unit provided in the housing for receiving a sound generated from the outside; An amplifying unit amplifying the sound received by the sound receiving unit; And an output unit for outputting the amplified sound to the outside.

The sound receiving unit may include a direction measuring unit for measuring a directionality of the sound received by the sound receiving unit, a sound selecting unit for selecting a sound received in a predetermined direction through the direction measuring unit, A noise removing unit for removing noise from the sound selected by the sound selecting unit; And a feedback component removing unit that removes the feedback component from the noise canceled noise canceled sound.

The directional measuring unit may calculate a direction of a sound source by comparing magnitudes of sounds received by the microphones.

Further, the predetermined direction is a front direction of the sound amplifying device.

In addition, the noise removing unit removes a sound having a frequency component of 20,000 hertz (Hz) or more as noise.

In addition, the howling component removing unit may include a howling component detecting unit that detects a frequency component of a predetermined magnitude or more from the noise-removed noise canceled part; And a gain adjusting unit for reducing a gain of a frequency component detected by the howling component detector.

In addition, the howling component removing unit may include a howling component detecting unit that detects a frequency component of a predetermined magnitude or more from the noise-removed noise canceled part; A judging unit for judging a state of howling when a frequency component detected by the howling component detector is maintained for a predetermined period of time or longer; An inverse-phase-frequency generating unit that generates a frequency having a phase opposite to that of the frequency component detected by the howling-component detecting unit, when it is determined that the determining unit is in a state of howling; And a mixer unit for combining the frequency generated by the anti-phase frequency generator and the signal input through the noise eliminator.

In addition, the sound receiving unit may include one or more microphones.

The present invention further provides a sound amplifying apparatus, comprising: a power transmitting unit for transmitting power in the form of a radio-magnetic field to the outside.

Further, the present invention further provides a sound amplifying apparatus, comprising: a magnetic induction receiver for receiving vibration of a voice coil motor.

And a magnetic receiver control unit for deactivating the sound receiving unit and inputting a signal received through the magnetic induction receiver to the amplifying unit upon receiving the vibration of the voice coil motor through the magnetic induction receiver, To provide a sound amplifying device.

Also, the present invention provides a sound amplifying apparatus, wherein the output unit is a piezoelectric speaker.

According to another aspect of the present invention, Amplifying the sound; And outputting the amplified sound to the outside.

Measuring the directionality of the received sound between the step of receiving sound from the outside and the step of amplifying the sound; Selecting only a sound received in a predetermined direction from the received sound; Removing noise from a sound received in a predetermined direction; And removing a howling component from the noise-removed sound.

Also, the step of measuring the directionality of the received sound provides a method of amplifying the sound, wherein the directionality of the sound is measured using the strength of the received signal of the mics.

In addition, the step of selecting only a sound received in a predetermined direction from the received sound is performed by removing a sound having a frequency component equal to or higher than a predetermined frequency among sounds received from the outside.

Also, the present invention provides a sound amplification method, wherein the predetermined frequency is a frequency of 20,000 hertz (Hz) or more.

In addition, the removing of the howling component from the noise-removed sound may include detecting a frequency component greater than a predetermined magnitude value from the noise-removed sound; And reducing the gain of the frequency component equal to or greater than the predetermined size value.

In addition, the removing of the howling component from the noise-removed sound may include detecting a frequency component greater than a predetermined magnitude value from the noise-removed sound; Determining whether a frequency component equal to or greater than the predetermined size value lasts for a predetermined period of time or longer; Generating an anti-phase frequency of a frequency component equal to or greater than a predetermined magnitude value if the frequency component equal to or greater than the preset constant magnitude value is maintained for a predetermined period of time; And synthesizing the anti-phase frequency with a frequency component equal to or greater than the preset constant amplitude value.

The predetermined direction is a direction in which the sound is received from the front direction.

As described above, the sound amplifying method and the sound amplifying apparatus according to the present invention have the following effects.

First, since the sound amplification method and the sound amplification apparatus according to the preferred embodiment of the present invention directly receive external sound, amplify the external sound, and send out the sound, the complicated procedure such as Bluetooth pairing is not necessary. Therefore, it is possible to quickly amplify the sound of an external device such as a cellular phone and send it out.

Second, even when a piezoelectric speaker is employed as an output means of a cellular phone, not a voice coil motor speaker, it can be amplified and output to the outside.

Third, an external device such as a cellular phone can be charged using a wireless power transmission technology while listening to a sound transmitted from an external device such as a cellular phone.

Fourth, by adopting a thin piezoelectric speaker as an output unit, it is possible to provide a sound amplifying apparatus that is thinned and lightweight.

FIG. 1 is a schematic view illustrating a sound amplifying apparatus according to a preferred embodiment of the present invention.
FIG. 2 is a schematic view showing a configuration of a sound amplifying apparatus according to a preferred embodiment (1) of the present invention.
FIG. 3 is a schematic view illustrating a configuration of a sound amplifying apparatus according to the second embodiment of the present invention.
FIG. 4 is a view schematically showing an internal configuration of a sound amplifying apparatus according to the third embodiment of the present invention.
FIG. 5 is a flowchart showing each step of a sound amplification method according to a preferred embodiment of the present invention.
FIG. 6 is a view showing a configuration of a sound amplifying apparatus according to an embodiment (4) of the present invention. FIG.
FIG. 7 is a diagram showing the internal configuration of the howling component removing unit of the sound amplifying apparatus; FIG.
8 is a view showing still another embodiment of the howling component removing unit of the sound amplifying apparatus according to the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and are herein described in detail. It should be understood, however, that the invention is not intended to be limited to the particular forms disclosed, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

FIG. 1 is a schematic view illustrating a sound amplifying apparatus according to a preferred embodiment of the present invention.

The sound amplifying apparatus 100 according to the preferred embodiment of the present invention can receive sound output from an external device such as the cellular phone 10, amplify the sound, and output the amplified sound. To be more precise, it is possible to amplify the sound transmitted from the cellular phone 10 located at the upper part of the sound amplifying apparatus 100 according to the preferred embodiment of the present invention, and output the amplified sound to the outside.

To this end, the sound amplifying apparatus 100 according to the preferred embodiment of the present invention may include a sound receiving unit 110 and an output unit 170.

The sound receiving unit 110 of the sound amplifying apparatus 100 according to the preferred embodiment of the present invention may be composed of one or more mics and the output unit 170 may be a speaker. In particular, the speaker may be constituted by a piezoelectric speaker, and the sound receiving unit 110 receives sound of an external device such as the cellular phone 10, transmits the sound to the amplifying unit, amplifies the amplified sound and transmits the amplified sound to the output unit 170 .

Therefore, the sound amplifying apparatus 100 according to the preferred embodiment of the present invention amplifies a signal transmitted from the cellular phone 10 and outputs it to the outside without a device recognition process such as bluetooth pairing, Can recognize the sound.

FIG. 2 is a schematic view showing a configuration of a sound amplifying apparatus 100 according to a preferred embodiment of the present invention.

An external device such as the cellular phone 10 used in a preferred embodiment of the present invention includes a piezoelectric speaker or a voice coil motor (VCM) speaker 1 as an output means for audio or audio, .

The sound output from the piezoelectric speaker or the voice coil motor speaker 1 can be received by the sound receiving unit 110 of the sound amplifying apparatus 100 according to the preferred embodiment of the present invention.

The sound receiving unit 110 composed of one or more microphones may transmit the received sound to the amplifying unit 160 and the amplifying unit 160 may amplify the received sound and transmit the amplified sound to the output unit 170. [

The output unit 170 including the piezoelectric speaker can receive the signal transmitted from the amplification unit 160 and output it to the outside.

Therefore, according to the sound amplifying apparatus 100 according to the embodiment of the present invention, the user can perform the NFC (Near Field Communication) one touch pairing process without any connection process The sound can be amplified and outputted to the outside without performing the process of placing the external device such as the cellular phone 10 in the sound amplifying apparatus 100 according to the preferred embodiment of the present invention.

Therefore, it is possible to easily listen to music or the like provided by the cellular phone 10 from the outside easily.

 FIG. 3 is a view briefly showing a configuration of a sound amplifying apparatus 100 according to (2) embodiment of the present invention.

The sound amplifying apparatus 100 according to the embodiment of the present invention may include a magnetic induction receiver 190, an amplifying unit 160, an output unit 170, and a power transmitting unit 180.

The sound amplifying apparatus 100 according to the embodiment of the present invention is different from the sound amplifying apparatus 100 according to the embodiment in that the sound transmitted from the mobile phone 10 is transmitted through a sound receiving unit 110 such as a microphone Not through the magnetic induction type receiver 190, but through the magnetic induction type receiver.

The speaker of the cellular phone 10 may be constituted by a piezoelectric speaker or a voice coil motor speaker 1. If the speaker of the cellular phone 10 is constituted by a voice coil motor speaker, the magnetically inductive receiver 190 of the sound amplifying apparatus 100 according to this embodiment of the present invention can prevent the coil of the voice coil motor speaker from shaking The magnetic field generated by the magnetic field can be received.

Then, after the signal of the magnetic field generated by the vibration of the voice coil motor is transmitted to the amplification unit 160 to amplify the signal amplitude, the signal can be transmitted to the output unit 170 to transmit the sound to the outside.

The sound amplifying apparatus 100 according to this embodiment of the present invention can transmit electric power to the cellular phone 10 wirelessly via the electric power transmitting unit 180 and the cellular phone 10 can transmit electric power to the electric power transmitting unit 180 may be provided with a power receiving unit 2 for receiving power.

4 is a view briefly showing an internal configuration of a sound amplifying apparatus 100 according to the third embodiment of the present invention.

The sound amplifying apparatus 100 according to the third embodiment of the present invention may include a sound receiving unit 110, an amplifying unit 160, an output unit 170, and a power transmitting unit 180.

The sound amplifying apparatus 100 according to the third embodiment of the present invention can detect the sound transmitted from the piezoelectric speaker of the cellular phone 10 by the sound receiving unit 110. [

The sound sensed by the sound receiving unit 110 composed of a microphone or the like is amplified by the amplifying unit 160 and then transmitted to the output unit 170 composed of a piezoelectric speaker or the like to be transmitted to the outside.

Here, the sound amplifying apparatus 100 according to the third embodiment of the present invention may further include a power transmitting unit 180 capable of wirelessly transmitting electric power to the cellular phone 10. [ The power transmitting unit 180 may generate a magnetic field to transmit the electric power to the outside, and in response thereto, the cellular phone 10 may include a power receiving unit 2 configured in a coil shape and capable of receiving a magnetic field .

Therefore, according to the sound amplifying apparatus 100 according to the third embodiment of the present invention, sound transmitted from an external device such as the cellular phone 10 can be transmitted immediately through the speaker without a pairing operation, ) Can be charged.

In addition, even when the speaker of the external device such as the cellular phone 10 is constituted by a piezoelectric speaker other than the voice coil motor speaker and can not sense the vibration of the coil, the sound outputted from the piezoelectric speaker is immediately received, .

FIG. 5 is a flowchart showing each step of a sound amplification method according to a preferred embodiment of the present invention.

First, a sound amplification method according to a preferred embodiment of the present invention may be performed by receiving sound from outside (S5-1)

Then, a magnetic field generated due to the vibration of the voice coil motor may be detected. (S5-2) If vibration of the voice coil motor is detected at this stage, Since it is not necessary to activate the sound receiving unit 110 such as a microphone because the sound of the device is output through the voice coil motor, a process of deactivating the microphone can be performed. (S5-9) A sound of a magnetic field generated by the vibration of the motor is cited to amplify the sound (S5-7), and it can be output to the outside by using a piezoelectric speaker or the like (S5-8)

However, if the vibration of the voice coil motor is not detected, the sound amplification method according to the preferred embodiment of the present invention may be performed by measuring the directionality of the received sound.

This is for distinguishing sounds received from the upper right or upper side of the sound amplifying apparatus 100 and sounds received from the outside, and this step may be performed using one or more microphones.

The process in which the directionality is measured can be achieved by comparing the magnitudes of the sounds received by the microphones. For example, if two microphones are installed apart from each other, the direction of the sound can be measured through the magnitude value of the sound received by each microphone. That is, in the case where one microphone is installed on the left side and the other microphone is installed on the right side, it can be judged that the sound source of sound is heard at the center between two microphones if the size of the received sound is the same. However, if the magnitude of the sound received by any one microphone is greater, it can be determined that the sound source is located closer to the microphone that measures the sound louder. For example, if the microphone on the left receives a louder sound, the directionality of the sound can be judged to be heard from the left.

As described above, the sound amplification method according to the preferred embodiment of the present invention can measure the directionality of sound received using a plurality of microphones.

(S5-4). That is, the sound amplification method according to the preferred embodiment of the present invention is a method of amplifying a sound of a mobile phone It is desirable to amplify only the sound output from an external device such as the microphone 10, and other sounds coming from other directions can be removed.

Next, the noise may be removed from the selected sound (S5-5). In order to do this, a filter for removing the high frequency region may be used.

Thereafter, a sound amplification method according to a preferred embodiment of the present invention may be performed to remove a howling component. (S5-7) In the sound amplification apparatus 100 according to the preferred embodiment of the present invention, The sound outputted to the outside via the output unit 170 of the speaker 170 is input to the sound receiving unit 110 composed of a microphone or the like and amplified again.

 The sound of howling and noise is removed can then be amplified and amplified (S5-7).

Then, the amplified signal is outputted through the piezoelectric speaker or the like (S5-8) and propagated to the outside.

The method of removing howling used in the sound amplification method according to the preferred embodiment of the present invention will be described in detail later, but it is not limited thereto, and it is obvious in the technical field that various ways of removing howling can be employed.

Further, in the description of the present invention, the magnetic field generated by the vibration of the voice coil motor or the voice coil motor can be interpreted to have the same meaning in view of the sound being reproduced by the vibration of the motor.

FIG. 6 is a view showing a configuration of a sound amplifying apparatus 100 according to a fourth embodiment of the present invention.

The sound amplifying apparatus 100 according to an embodiment of the present invention includes a sound receiving unit 110, a directional measuring unit 120, a sound selecting unit 130, a noise removing unit 140, a howling component removing unit 150, An amplifying unit 160, a power transmitting unit 180, a magnetic induction receiver 190, a magnetic receiver control unit 191, an output unit 170, and the like.

The sound amplifying apparatus 100 according to the embodiment of the present invention may include the sound receiving unit 110 and the magnetic induction receiver 190 at the same time. 5, when an external device such as the cellular phone 10 outputs sound using a voice coil motor, the magnetic induction type receiver 190 uses the magnetic field received by the external device to output sound Can be output. To this end, the magnetic receiver control unit 191 may control the sound receiving unit 110 to be inactivated, amplify only the signal received through the magnetic induction type receiver 190, and transmit the amplified signal to the outside using the output unit 170.

The directional measurement unit 120 of the sound amplifying apparatus 100 according to the embodiment of the present invention may include one or more microphones to determine the position of the sound source of the sound based on the magnitude of the signal received by the microphones .

Based on the position of the sound source measured by the directional measurement unit 120, the sound selection unit 130 can select only the sound transmitted from the external device such as the mobile phone 10 located on the upper side of the sound amplification apparatus 100 have.

The noise removing unit 140 of the sound amplifying apparatus 100 according to the embodiment of the present invention can remove the noise including white noise from the sound selected by the sound selecting unit 130 .

The thus removed signal may be output from the output unit 170 through the howling component removing unit 150 and then removed from the sound receiving unit 110. The method for removing the howling component may be any of known methods, and the method used in the howling component removing unit 150 of the sound amplifying apparatus 100 according to the fourth embodiment of the present invention will be described later, But is not limited thereto.

The amplification unit 160 of the sound amplification apparatus 100 according to the embodiment of the present invention may amplify the sound signal from which the howling component is removed to deliver the sound signal to the output unit 170 composed of the piezoelectric speakers.

Then, the output unit 170 can reproduce such a signal and output it to the outside.

FIG. 7 is a diagram showing an internal configuration of a howling component removing unit 150 of the sound amplifying apparatus 100; FIG.

The howling component removing unit 150 of the sound amplifying apparatus 100 may include a howling component detecting unit 151 and a gain adjusting unit 152. [

The howling component detector 151 can detect the howling component in the received sound by measuring the amplification according to the frequency component of the received sound. For example, when a signal received from the cellular phone 10 and a signal output through the speaker of the sound amplifying apparatus 100 of the present invention enter through the sound receiving unit 110, It may have a larger magnitude value than the sound emitted from the telephone 10. [

Therefore, the howling component detector 151 recognizes a sound having a predetermined size or more as a sound output from the speaker, and recognizes it as a howling component to be removed.

The thus-recognized howling component can be adjusted in size through the gain controller 152. That is, it is possible to reduce the howling component by reducing the gain to be much smaller than the signal transmitted from the cellular phone 10.

8 is a view showing another embodiment of the howling component removing unit 150 of the sound amplifying apparatus 100 according to the present invention.

The howling component removing unit 150 of FIG. 8 may include a howling component detecting unit 151, a determining unit 153, an inverse phase frequency generating unit 154, and a mixer unit 155.

The howling component detector 151 may recognize a frequency component of a predetermined magnitude or more as a feedback component.

The determination unit 153 may determine that the sound is in a howling state if the sound continues for a predetermined period of time.

If it is determined that the hauling phenomenon has occurred, the anti-phase frequency generator 154 of the howling component removing unit 150 may generate a signal having a phase opposite to that of the signal recognized as a howling component.

The mixer unit 155 may combine the signal having the opposite phase generated by the inverse phase frequency generator 154 with the signal output from the noise suppression unit 140 to remove the howling component. That is, rather than simply attenuating the size of the frequency recognized as a howling component, it is possible to generate a reverse phase in the opposite direction and to remove the howling component cleanly.

In the description of the present invention, the term 'preset' in the 'predetermined size' or 'predetermined period of time' indicates a value that can be preferably selected to implement the present invention, and is freely selected in various embodiments .

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it should be understood that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims. It will be understood that the invention may be modified and changed without departing from the scope of the invention.

1: Piezoelectric speaker or voice coil motor speaker
2: Power receiver
10: Mobile phone
100: Sound amplifying device
110: sound receiver
120: directional measuring unit
130: sound selection unit
140: Noise canceling
150: Howling component removal
151: Howling component detector
152:
153:
154: Inverse phase frequency generator
155: Mixer section
160:
170:
180:
190: magnetic induction receiver
191: magnetic receiver control section

Claims (20)

A housing on which an external device is mounted;
A sound receiving unit provided in the housing for receiving a sound generated from the outside;
An amplifying unit amplifying the sound received by the sound receiving unit;
An output unit for outputting the amplified sound to the outside;
Lt; / RTI >
A direction measuring unit for measuring a directionality of a sound received by the sound receiving unit;
A sound selection unit for selecting a sound received in a predetermined direction through the directional measurement unit;
A noise removing unit for removing noise from the sound selected by the sound selecting unit;
And a feedback unit removing the feedback component from the noise canceled noise canceled sound.
delete The method according to claim 1,
The directional measuring unit
And calculates the direction of the sound source by comparing the magnitude values of the sounds received by the microphones.
The method according to claim 1,
The preset predetermined direction is
Wherein the sound amplifying device is a front direction of the sound amplifying device.
The method according to claim 1,
The noise removing unit
Characterized in that a sound having a frequency component of 20,000 hertz (Hz) or more is regarded as noise and removed.
The method according to claim 1,
The howling component removing unit
A feedback component detector for detecting a frequency component equal to or greater than a preset constant magnitude value from the noise canceled noise canceled noise;
And a gain adjuster for reducing a gain of the frequency component detected by the howling component detector.
The method according to claim 1,
The howling component removing unit
A feedback component detector for detecting a frequency component equal to or greater than a preset constant magnitude value from the noise canceled noise canceled noise;
A judging unit for judging a state of howling when a frequency component detected by the howling component detector is maintained for a predetermined period of time or longer;
An inverse-phase-frequency generating unit that generates a frequency having a phase opposite to that of the frequency component detected by the howling-component detecting unit, when it is determined that the determining unit is in a state of howling;
And a mixer unit for combining the frequency generated by the anti-phase frequency generator and the signal input through the noise eliminator.
The method according to claim 1,
The sound receiving unit
And one or more microphones.
The method according to claim 1,
And a power transmitting unit for transmitting power in the form of a radio-magnetic field to the outside.
The method according to claim 1,
And a magnetic induction receiver for receiving the vibration of the voice coil motor.
11. The method of claim 10,
And a magnetic receiver control unit for deactivating the sound receiving unit and inputting a signal received through the magnetic induction receiver to the amplifying unit upon receiving the vibration of the voice coil motor through the magnetic induction type receiver, Amplifying device.
The method according to claim 1,
Wherein the output unit is a piezoelectric speaker.
Receiving sound from outside;
Amplifying the sound;
The amplified sound is output to the outside:
Lt; / RTI >
A step of receiving sound from the outside
Between the steps where the sound is amplified,
Measuring the directionality of the received sound;
Selecting only a sound received in a predetermined direction from the received sound;
Removing noise from a sound received in a predetermined direction;
And removing a howling component from the noise-removed sound.
delete 14. The method of claim 13,
The step of measuring the directionality of the received sound
Characterized in that the direction of the sound is measured using the intensity of the signal received by the mics.
14. The method of claim 13,
The step of selecting only the sounds received in the predetermined direction from the received sounds
Wherein a sound having a frequency component equal to or higher than a predetermined frequency is removed from the sound received from the outside.
17. The method of claim 16,
Wherein the predetermined frequency is a frequency of 20,000 hertz (Hz) or more.
14. The method of claim 13,
The step of removing the howling component from the noise-canceled sound
Detecting a frequency component equal to or greater than a preset constant magnitude value from the noise canceled sound;
And reducing the gain of the frequency component equal to or greater than the predetermined size value.
14. The method of claim 13,
The step of removing the howling component from the noise-canceled sound
Detecting a frequency component equal to or greater than a preset constant magnitude value from the noise canceled sound;
Determining whether a frequency component equal to or greater than the predetermined size value lasts for a predetermined period of time or longer;
Generating an anti-phase frequency of a frequency component equal to or greater than a predetermined magnitude value if the frequency component equal to or greater than the preset constant magnitude value is maintained for a predetermined period of time;
And synthesizing the anti-phase frequency with a frequency component equal to or greater than the preset constant amplitude value.
14. The method of claim 13,
The preset predetermined direction is
And the sound is a direction in which the sound is received from the front direction.

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