WO2012144706A1

WO2012144706A1 - Ear microphone

Info

Publication number: WO2012144706A1
Application number: PCT/KR2011/007720
Authority: WO
Inventors: 신두식
Original assignee: Shin Doo Sik
Priority date: 2011-04-19
Filing date: 2011-10-18
Publication date: 2012-10-26

Abstract

The present invention relates to an ear microphone. The ear microphone includes: a first microphone converting an audio signal of a user into a first electrical signal; a second microphone converting the audio signal of the user into a second electrical signal; a third microphone converting an external noise signal into a third electrical signal; and a signal processor which combines the first electrical signal and the second electrical signal, and which removes a noise signal included in the combined electrical signal using the third electrical signal.

Description

Ear microphone

An embodiment according to the concept of the present invention relates to an ear microphone, and more particularly, to an ear microphone capable of removing a noise signal.

In general, the ear microphone is used to be worn on the user's ear while being coupled to an external device such as a sound device or a mobile phone for listening and communication of sound like a general earphone.

Figure 1 shows a schematic configuration of a conventional ear microphone.

Referring to FIG. 1, the ear microphone includes a connector 10 coupled to an external device 1 and a main body 20 worn on the user's ear. The main body 20 is shaped to enter the user's ear, the speaker 22 for outputting the voice signal on the surface facing the user's ear and the voice signal transmitted through the ear canal of the user converts the electrical signal into an electrical connector And a microphone 23 for outputting to 10.

However, in the case of the ear microphone, external noise is introduced into the ear microphone, so that the sound quality is degraded. That is, the external noise is included in the voice signal transmitted to the counterpart, thereby degrading sound quality.

In addition, in the case of the ear microphone, the external noise is introduced into the ear canal through the cover or housing of the ear microphone. The noise signal introduced into the ear canal may cause hearing loss of the user.

Therefore, the technical problem to be achieved by the present invention is to provide an ear microphone capable of removing noise components due to external noise introduced into the ear microphone from the output signal of the microphone.

In addition, the technical problem to be achieved by the present invention is to output a signal having a phase opposite to the phase of the noise signal introduced into the ear canal through the cover or housing of the ear microphone, so that the noise signal introduced into the ear canal in space, That is to provide an ear microphone that can be removed within the ear canal.

According to an embodiment of the present invention, an ear microphone includes a first microphone for converting a voice signal of a user into a first electric signal, a second microphone for converting the voice signal of the user into a second electric signal, and an external noise signal. A third microphone converting the third electrical signal, and a signal processor to add the first electrical signal and the second electrical signal, and to remove a noise signal included in the added electrical signal using the third electrical signal. signal processor).

The phase of the third electrical signal may be opposite to the phase of the external noise signal.

In addition, the third microphone may receive the external noise signal through a hole passing through the housing of the ear microphone.

The signal processor may include a first adder for adding the first electrical signal and the second electrical signal, and a second adder for adding the output signal of the first adder and the third electrical signal.

The signal processor may further include a filter for filtering the output signal of the second adder.

The signal processor may further include a first adder for adding the first electrical signal and the second electrical signal, a first filter for filtering an output signal of the first adder, and a first filter for filtering the third electrical signal. And a second adder for adding an output signal of the first filter and an output signal of the second filter.

The signal processor may further include a first adder for adding the first electrical signal and the second electrical signal, a first filter for filtering an output signal of the first adder, and a first filter for filtering the third electrical signal. A second filter, an amplifier for amplifying the output signal of the first filter, and a second adder for adding the output signal of the amplifier and the output signal of the second filter.

Further, the signal processor receives the output signal of the amplifier and the output signal of the second filter, and the magnitude of the noise signal included in the output signal of the amplifier is equal to the magnitude of the output signal of the second filter. It may further include a gain regulator for controlling the gain of the amplifier to be equal.

The signal processor may further receive the output signal of the first filter and the output signal of the second filter, and determine the magnitude of the noise signal included in the output signal of the amplifier and the output signal of the second filter. It may further include a gain adjuster for controlling the gain of the amplifier to be equal in magnitude.

The signal processor may further include a third filter for filtering the output signal of the second adder.

According to another embodiment of the present invention, an ear microphone includes a first microphone for converting a voice signal of a user into a first electric signal, a second microphone for converting an external noise signal into a second electric signal, and the first electric signal and the And a signal processor for receiving a second electrical signal and removing the noise signal included in the first electrical signal using the second electrical signal.

The phase of the second electrical signal may be opposite to the phase of the external noise signal.

In addition, the second microphone may receive the external noise signal through a hole passing through the housing of the ear microphone.

The signal processor may also include an adder for adding the first electrical signal and the second electrical signal.

The first microphone may be implemented as a capacitor microphone including a back-hole.

The signal processor may further include a filter for filtering the output signal of the adder.

The signal processor may further include a first filter for filtering the first electrical signal, a second filter for filtering the second electrical signal, an amplifier for amplifying an output signal of the first filter, and an output of the amplifier. And an adder for adding a signal and an output signal of the second filter.

The signal processor may further include a third filter for filtering the output signal of the adder.

In addition, the signal processor receives the output signal of the amplifier and the output signal of the second filter, the magnitude of the output signal of the second filter and the magnitude of the noise signal included in the output signal of the amplifier It may further include a gain regulator for controlling the gain of the amplifier to be equal.

The signal processor may further receive the output signal of the first filter and the output signal of the second filter, and determine the magnitude of the output signal of the second filter and the noise signal included in the output signal of the amplifier. It may further include a gain adjuster for controlling the gain of the amplifier to be equal in magnitude.

According to another embodiment of the present invention, an ear microphone includes a first microphone for converting an external noise signal into a first electric signal, filtering the first electric signal, and filtering the filtered signal and a second electric signal provided from an external device. And a speaker for converting and outputting an output signal of the signal processor into a voice signal.

The ear microphone may further include a second microphone for converting a user's voice signal provided through the ear canal into a third electrical signal.

In addition, the phase of the first electrical signal may be opposite to the phase of the external noise signal.

In addition, the second microphone may be implemented as a capacitor microphone including a back hole.

In addition, the first microphone may receive the external noise signal through a hole passing through the housing of the ear microphone.

The signal processor may also include a filter for filtering the first electrical signal and an adder for adding the output signal of the filter and the second electrical signal.

The ear microphone according to another embodiment of the present invention, the first microphone for converting the user's voice signal provided through the ear canal and the noise signal introduced into the ear canal into a first electrical signal, and filtering the first electrical signal, A signal processor for adding the filtered signal and the second electrical signal provided from an external device, and a speaker for converting the output signal of the signal processor into a voice signal for outputting.

The ear microphone may further include a second microphone for converting the voice signal of the user into a third electrical signal.

In addition, the phase of the first electrical signal may be opposite to the phase of the voice signal of the user and the phase of the noise signal.

In addition, the filter may remove the voice signal component of the user included in the first electrical signal.

Ear microphone according to an embodiment of the present invention has the effect of improving the quality of the voice signal transmitted to the counterpart by removing the noise signal included in the output signal of the microphone.

In addition, the ear microphone according to an embodiment of the present invention has the effect of preventing the hearing loss of the user by removing the noise signal introduced into the ear canal through the cover or housing of the ear microphone.

In addition, the ear microphone according to an embodiment of the present invention has the effect of improving the quality of the voice signal transmitted to the other party by removing the noise signal introduced into the ear canal.

The detailed description of each drawing is provided in order to provide a thorough understanding of the drawings cited in the detailed description of the invention.

Figure 1 shows a schematic configuration of a conventional ear microphone.

2 illustrates a configuration of an ear microphone according to an embodiment of the present invention.

3 is a partially enlarged view of the ear microphone shown in FIG. 2.

4 is a left side view of the soundproof member shown in FIG. 2.

5 is a block diagram of some components included in the ear microphone shown in FIG. 2.

FIG. 6 is an embodiment of the signal processor shown in FIG. 5.

FIG. 7 is a circuit diagram of the first filter illustrated in FIG. 6.

FIG. 8 is a circuit diagram of the third filter illustrated in FIG. 6.

FIG. 9 is another embodiment of the signal processor shown in FIG. 5.

FIG. 10 is another embodiment of the signal processor shown in FIG. 5.

FIG. 11 is another embodiment of the signal processor shown in FIG. 5.

12 illustrates a configuration of an ear microphone according to another embodiment of the present invention.

FIG. 13 is a partially enlarged view of the ear microphone shown in FIG. 12.

FIG. 14 is a left side view of the soundproof member shown in FIG. 12. FIG.

FIG. 15 is a block diagram of some components included in the ear microphone shown in FIG. 12.

FIG. 16 is an embodiment of the signal processor shown in FIG. 15.

FIG. 17 is a circuit diagram of the first filter illustrated in FIG. 16.

FIG. 18 is a circuit diagram of the third filter illustrated in FIG. 16.

FIG. 19 is another embodiment of the signal processor shown in FIG. 15.

20 is another embodiment of the signal processor shown in FIG. 15.

FIG. 21 is yet another embodiment of the signal processor shown in FIG. 15.

22 is a block diagram of an ear microphone according to another embodiment of the present invention.

FIG. 23 is a partially enlarged view of the ear microphone shown in FIG. 22.

24 is a left side view of the soundproof member shown in FIG. 22.

FIG. 25 is a block diagram of some components included in the ear microphone shown in FIG. 22.

FIG. 26 is a block diagram of the signal processor shown in FIG. 25.

FIG. 27 is a circuit diagram of the filter shown in FIG. 26.

28 illustrates a configuration of an ear microphone according to another embodiment of the present invention.

FIG. 29 is a block diagram of some components included in the ear microphone shown in FIG. 28.

30 is a block diagram of the signal processor illustrated in FIG. 29.

FIG. 31 is a circuit diagram of the filter shown in FIG. 30.

Specific structural to functional descriptions of the embodiments according to the inventive concept disclosed herein are merely illustrated for the purpose of describing the embodiments according to the inventive concept. It may be embodied in various forms and should not be construed as limited to the embodiments set forth herein or in the application.

Embodiments according to the concept of the present invention may be variously modified and may have various forms, and specific embodiments will be illustrated in the drawings and described in detail in the present specification or application. However, this is not intended to limit the embodiments in accordance with the concept of the present invention to a particular disclosed form, it should be understood to include all changes, equivalents, and substitutes included in the spirit and scope of the present invention.

Terms such as first and / or second may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another, for example, without departing from the scope of rights in accordance with the inventive concept, and the first component may be called a second component and similarly The second component may also be referred to as the first component.

When a component is referred to as being "connected" or "connected" to another component, it may be directly connected to or connected to that other component, but it may be understood that other components may be present in between. Should be. On the other hand, when a component is said to be "directly connected" or "directly connected" to another component, it should be understood that there is no other component in between. Other expressions describing the relationship between components, such as "between" and "immediately between," or "neighboring to," and "directly neighboring to" should be interpreted as well.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. As used herein, the terms "comprise" or "having" are intended to indicate that there is a feature, number, step, action, component, part, or combination thereof that is described, and that one or more other features or numbers are present. It should be understood that it does not exclude in advance the possibility of the presence or addition of steps, actions, components, parts or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art. Terms such as those defined in the commonly used dictionaries should be construed as having meanings consistent with the meanings in the context of the related art, and are not construed in ideal or excessively formal meanings unless expressly defined herein. Do not.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Referring to FIG. 2, the ear microphone 1000 includes a connector 10 coupled to an external device and a body 100 shaped to be worn on a user's ear. At this time, the connector 10 and the main body 100 are electrically coupled through the cable (C).

The main body 100 includes a housing 110 having a size that can be entered into the user's ear. The housing 110 may have a non-linear shape in which one side is bent. In addition, an opening 111 for inputting and outputting a voice signal is formed at a central portion of the housing 110 opposite to the outer ear canal. Inside the housing 110, a speaker 120, a first microphone 130, a second microphone 135, and a third microphone 137 are provided.

The output line of the first microphone 130, the output line of the second microphone 135, and the output line of the third microphone 137 are connected to the input terminal of the signal processor 170, and the output terminal of the signal processor 170 is It is connected to the connector 10.

The speaker 120 converts an electrical signal provided from an external device, such as a mobile phone, into a voice signal through the connector 10 and outputs the voice signal. The voice signal output from the output terminal 121 of the speaker 120 includes the first through hole 143 of the soundproofing member 140, the opening part 111 of the housing 110, and the opening groove 161 of the cover 160. Through the ear canal). In this case, the opening 111 of the housing 110 may be implemented as a plurality of grooves corresponding to each of the first through hole 143, the second through hole 144, and the third through hole 145.

The first microphone 130 converts the voice signal of the user provided through the ear canal into an electrical signal and outputs the electrical signal to the signal processor 170.

The speaker 120 and the first microphone 130 are disposed in parallel with each other, and the speaker 120 and the first microphone 130 are fixedly supported inside the housing 110 by a soundproof member 140 for supporting them. do. In this case, the output terminal 121 of the speaker 120 and the input terminal 131 of the first microphone 130 are disposed to face the same direction. That is, the speaker 120 is disposed such that the output terminal 121 faces the opening 111 of the housing 110, and the first microphone 130 has the input terminal 131 having the opening 111 of the housing 110. It is arranged to face. Accordingly, the speaker 120 is disposed such that the output terminal 121 faces the opposite surface of the ear canal, and the first microphone 130 is disposed such that the input terminal 131 faces the opposite surface of the ear canal.

The third microphone 137 converts the voice signal of the user provided through the ear canal into an electrical signal and outputs the electrical signal to the signal processor 170. The third microphone 137 may be disposed on the opposite side of the input terminal 131 of the first microphone 130 and may be disposed in line with the first microphone 130. Therefore, the first microphone 130 and the third microphone 137 may be disposed in a straight line in the microphone receiving groove of the soundproofing member 140. In this case, the first microphone 130 may be disposed on the outer ear canal side of the microphone accommodating groove 142, and the second microphone 137 may be disposed on the right side of the first microphone 130. In addition, the first microphone 130 is arranged such that the input end 131 faces the external auditory meatus, and the second microphone 137 is arranged such that the input end 138 faces the opposite direction of the ear canal.

The soundproof member 140 shown in FIG. 2 is a single layer, but in some embodiments, the soundproof member 140 for noise shielding may be configured in a multilayer. In addition, the soundproof member 140 may be separated into a plurality of pieces to facilitate the assembly of the ear microphone 1000.

In addition, the ear microphone 1000 is provided with a cover 160 for allowing the ear microphone 1000 to be in close contact with the user's ear at the outside of the external auditory meatus side of the housing 110. The cover 160 surrounds a part of the outer ear canal side of the housing 110, and a plurality of protrusions 162 are formed at an outer side thereof, and an opening groove 161 communicating with the opening 111 of the housing 110 at a central portion thereof. ) Is formed. At this time, the cover 160 is in close contact with the user's ear, it may be made of a material having a soft touch, for example, silicon.

The second microphone 135 converts an external noise signal into an electrical signal. The second microphone 135 is located opposite the opening 111 of the housing 110. In addition, an outer through hole 112 is provided at a side of the housing 110 to provide the external noise signal to the second microphone 135. The second microphone 135 may be disposed such that an input end thereof faces the outer through groove 112, and receive the external noise signal transmitted through the outer through groove 112. In addition, the left side of the second microphone 135, that is, the outer ear canal facing surface is surrounded by the soundproofing member 140, so that the external noise signal is blocked from flowing into the soundproofing member 140, and the second microphone ( 135 is fixedly supported by the soundproof member 140.

The second microphone 135 converts the external noise signal into an electrical signal and transmits the electrical signal to the signal processor 170. In this case, the phase of the output signal of the second microphone 135 may be opposite to the phase of the external noise signal.

Accordingly, the voice signal of the user may be transmitted through the open groove 161 of the cover 160, the open part 111 of the housing 110, and the second through groove 144 of the soundproof member 140 through the ear canal. It is provided to the input terminal 131 of the microphone 130. In addition, the voice signal of the user is provided to the input terminal 138 of the third microphone 137 through the third through hole 145.

The signal processor 170 adds an output signal of the first microphone 130 and an output signal of the third microphone 137, and includes a noise signal included in the output signal added using the output signal of the second microphone 135. Can be removed.

The ear microphone 1000 may be implemented using a Bluetooth technology. In this case, the microphone 1000 may not include the connector 10.

3 is a partially enlarged view of the ear microphone illustrated in FIG. 2, and FIG. 4 is a left side view of the soundproof member illustrated in FIG. 1. That is, FIG. 4 shows the external appearance of the sound insulation member 140 seen from the ear canal side.

2 to 4, the soundproof member 140 is formed in a cylindrical shape with a step (stepped shape), the speaker receiving groove 141 and the first microphone 130 for disposing the speaker 120 inside. And a microphone accommodating groove 142 for disposing the third microphone 137. Here, the speaker accommodating groove 141 and the microphone accommodating groove 142 are the speaker 120, the first microphone 130, in order to minimize the vibration caused by the external impact or mechanical vibration generated in the mechanism inside the main body 100, And a third microphone 137.

In addition, a first through hole 143 is formed at the left side of the speaker accommodating groove 141, that is, the center portion of the opposing external auditory meatus to transmit the voice signal output from the speaker 120 to the ear canal. In addition, a second through hole 144 is formed at a position corresponding to the microphone accommodating groove 142. The first microphone 130 may receive a user's voice signal transmitted from the ear canal through the second through groove 144.

The soundproof member 140 is provided with a third through hole 145 for providing a user's voice signal to the input terminal 138 of the third microphone 137.

2 through 4, the third through hole 145 is located between the first through hole 143 and the second through hole 144, but the present invention is limited to the position of the third through hole 145. The plurality of third through holes 145 may be implemented. In addition, the third through hole 145 may be implemented to communicate with the speaker receiving groove 141.

5 is a block diagram of some components of the ear microphone shown in FIG. 2.

2 to 5, the ear microphone 1000 includes a first microphone 130, a second microphone 135, a third microphone 137, and a signal processor 170.

The first microphone 130 converts a user's voice signal into an electrical signal and outputs the converted electrical signal. The output signal of the first microphone 130 includes a voice signal s (t) and a noise signal n1 (t).

The third microphone 137 converts the voice signal of the user into an electrical signal and outputs the electrical signal. The output signal of the third microphone 137 includes a voice signal s (t) and a noise signal n1 (t).

Since each of the first microphone 130 and the third microphone 137 converts the voice signal of the user into an electrical signal and outputs the signal, the output signal of the first microphone 130 and the third microphone 137 The output signal has the same value.

The second microphone 135 converts an external noise signal into an electrical signal and outputs the electrical signal. The phase of the output signal -n2 (t) of the second microphone 135 is opposite to that of the external noise signal.

The signal processor 170 receives the output signal of the first microphone 130, the output signal of the second microphone 135, and the output signal of the third microphone 137. The signal processor 170 adds the output signal of the first microphone 130 and the output signal of the third microphone 137 and includes it in the added output signal using the output signal of the third microphone 137. Noise signal can be removed.

FIG. 6 is an embodiment of the signal processor shown in FIG. 5.

2 to 6, the signal processor 171 includes a first adder 181 and a second adder 186. The signal processor 171 may further include a first filter 180, a second filter 182, and a third filter 188.

The first adder 181 adds the output signal of the first microphone 130 and the output signal of the third microphone 137.

The first filter 180 filters the output signal of the first adder 181, and the second filter 182 filters the output signal of the second microphone 135. In addition, although not shown in FIG. 6, the filter having the same structure as the first filter 180 and having the same function as the first filter 180 may have an output terminal of the first microphone 130 and an output terminal of the third microphone 137. Can be implemented in

The second adder 186 adds the output signal of the first filter 180 and the output signal of the second filter 182. The noise signal 2 * n1 (t) included in the output signal of the first filter 180 is canceled by the output signal -n2 (t) of the second filter 182. Therefore, the output signal of the second adder 186 includes only the audio signal 2 * s (t).

The third filter 188 filters the output signal of the second adder 186.

FIG. 7 is a circuit diagram of the first filter illustrated in FIG. 6.

2 to 7, the first filter 180 may include a first capacitor C1, a first resistor R1, and a serial connection between the input terminal 180-1 and the output terminal 180-2. It includes a second resistor (R2). In addition, the first filter 180 may include the second capacitor C2 and the first filter 180 connected between the common node 180-3 of the first resistor R1 and the second resistor R2 and the ground terminal. And a third capacitor C3 connected between the output terminal 180-2 and the ground terminal.

The first filter 180 removes the DC component included in the output signal of the first adder 181 by using the first capacitor C1 and uses the second capacitor C2 and the third capacitor C3. The high frequency noise signal included in the output signal of the first adder 181 may be removed. In addition, the first filter 180 may be connected between the first adder 181 and the second adder 186 to perform impedance matching.

The structure and operation of the second filter 182 are the same as the structure and operation of the first filter 180.

FIG. 8 is a circuit diagram of the third filter illustrated in FIG. 6.

2 to 6 and 8, the third filter 188 may include a third resistor R3 and an output terminal 188-2 connected between the input terminal 188-1 and the output terminal 188-2. And a fourth capacitor C4 connected between the ground terminal and the ground terminal.

The third filter 188 may remove the high frequency noise included in the output signal of the second adder 186 using the fourth capacitor C4. In addition, the third filter 188 may be connected between the second adder 186 and the connector 10 to perform impedance matching.

FIG. 9 is another embodiment of the signal processor shown in FIG. 5.

2 through 5 and 9, the signal processor 172 includes a first adder 181, an amplifier 184, and a second adder 186. The signal processor 172 may further include a first filter 180, a second filter 182, and a third filter 188.

The amplifier 184 amplifies the output signal of the first filter 180. That is, the amplifier 184 amplifies the output signal of the first filter 180 by K times. The output signal of the amplifier 184 includes a voice signal 2 * K * s (t) and a noise signal 2 * K * n1 (t). Here, K may have a predetermined value or may have a value adjusted by a user.

As a result, the magnitude (or amplitude) of the noise signal 2 * K * n1 (t) included in the output signal of the amplifier 184 is determined by the output signal (-n2 (t)) of the second filter 182. It will be equal to magnitude (or amplitude).

The second adder 186 adds the output signal of the amplifier 184 and the output signal of the second filter 182. Since the magnitude of the noise signal 2 * K * n1 (t) included in the output signal of the amplifier 184 is equal to the magnitude of the output signal (-n2 (t)) of the second filter 182, and its phase is opposite, The noise signal 2 * K * n1 (t) is canceled by the output signal -n2 (t) of the second filter 182.

Therefore, the output signal of the second adder 186 includes only the audio signal 2 * K * s (t).

The third filter 188 filters the output signal of the second adder 186.

FIG. 10 is another embodiment of the signal processor shown in FIG. 5.

2-5 and 10, the signal processor 174 includes a first adder 181, an amplifier 184, a gain adjuster 189, and a second adder 186. The signal processor 174 may further include a first filter 180, a second filter 182, and a third filter 188.

The gain regulator 189 receives the output signal of the amplifier 184 and the output signal of the second filter 182 (-n2 (t)), and output signal of the second filter 182 (-n2 (t)). The gain K of the amplifier 184 may be controlled to equal the magnitude of the noise signal and the magnitude of the noise signal 2 * K * n1 (t) included in the output signal of the amplifier 184.

FIG. 11 is yet another embodiment of the signal processor shown in FIG. 5.

2 through 5 and 11, the signal processor 176 includes a first adder 181, an amplifier 184, a gain adjuster 189, and a second adder 186. The signal processor 176 may further include a first filter 180, a second filter 182, and a third filter 188.

The gain regulator 189 receives the output signal of the first filter and the output signal of the second filter 182 (-n2 (t)), and receives the output signal of the second filter 182 of the output signal (-n2 (t)). The gain K of the amplifier 184 may be controlled so that the magnitude equals the magnitude of the noise signal 2 * K * n1 (t) included in the output signal of the amplifier 184.

Referring to FIG. 12, the ear microphone 2000 includes a connector 10 coupled to an external device and a main body 200 that is worn on the user's ear. At this time, the connector 10 and the main body 200 are electrically coupled through the cable (C). Hereinafter, differences between the ear microphone 1000 shown in FIG. 2 and the ear microphone 2000 shown in FIG. 12 will be mainly described.

The main body 200 includes a housing 110 having a size that can be entered into the user's ear. The housing 110 may have a non-linear shape in which one side is bent. In addition, an opening 111 for inputting and outputting a voice signal is formed at a central portion of the housing 110 opposite to the outer ear canal. The speaker 220, the first microphone 230, and the second microphone 235 are positioned inside the housing 110.

The output line of the first microphone 230 and the output line of the second microphone 235 are connected to the input terminal of the signal processor 270, and the output terminal of the signal processor 270 is connected to the connector 10.

The speaker 220 converts and outputs an electrical signal provided from an external device such as a mobile phone into a voice signal through the connector 10. The voice signal output from the output terminal 221 of the speaker 220 includes a first through hole 143 of the soundproofing member 140, an opening part 111 of the housing 110, and an opening groove 161 of the cover 160. Through the ear canal). In this case, the opening 111 of the housing 110 may be implemented as a plurality of grooves corresponding to each of the first through hole 143, the second through hole 144, and the third through hole 145.

The first microphone 230 converts a user's voice signal provided through the ear canal into an electrical signal and outputs the electrical signal to the signal processor 270.

According to an embodiment, the first microphone 230 may be implemented as a capacitor microphone including a back hole 234. In this case, the first microphone 230 has an effect of amplifying and outputting a user's voice signal. In addition, since the first microphone 230 includes the back-hole 234, the first microphone 230 has a bidirectional characteristic. Thus, the first microphone 230 has a strong characteristic against noise.

The speaker 220 and the first microphone 230 are disposed in parallel to each other, the speaker 220 and the first microphone 230 is fixedly supported inside the housing 110 by a soundproof member 140 for supporting them. do. In this case, the output terminal 221 of the speaker 220 and the input terminal 231 of the first microphone 230 are disposed to face the same direction. That is, the speaker 220 is disposed such that the output terminal 221 faces the opening 111 of the housing 110, and the first microphone 230 has the input terminal 231 having the opening 111 of the housing 110. It is arranged to face. Accordingly, the speaker 220 is arranged such that the output end 221 faces the opposing face of the ear canal, and the first microphone 230 is arranged such that the input end 231 faces the opposing face of the ear canal.

The soundproof member 140 shown in FIG. 2 is a single layer, but in some embodiments, the soundproof member 140 for noise shielding may be configured in a multilayer. In addition, the soundproof member 140 may be separated into a plurality of pieces to facilitate the assembly of the ear microphone 2000.

In addition, the ear microphone 2000 is provided with a cover 160 to allow the ear microphone 2000 to be in close contact with the user's ear at the outside of the outer ear canal side of the housing 110. The cover 160 surrounds a part of the outer ear canal side of the housing 110, and a plurality of protrusions 162 are formed at an outer side thereof, and an opening groove 161 communicating with the opening 111 of the housing 110 at a central portion thereof. ) Is formed. At this time, the cover 160 is in close contact with the user's ear, it may be made of a material having a soft touch, for example, silicon.

The second microphone 235 converts an external noise signal into an electrical signal. The second microphone 235 is located opposite the opening 111 of the housing 110. In addition, an outer through hole 112 is provided at a side of the housing 110 to provide the external noise signal to the second microphone 235. The second microphone 235 may be disposed such that an input end thereof faces the external through groove 112, and receive the external noise signal transmitted through the external through groove 112. In addition, the left side of the second microphone 235, that is, the outer ear canal facing surface is surrounded by the soundproofing member 140, and the external noise signal is blocked from flowing into the soundproofing member 140. 235 is fixedly supported by the soundproof member 140.

The second microphone 235 converts the external noise signal into an electrical signal and transmits the electrical signal to the signal processor 270. In this case, the phase of the output signal of the second microphone 235 may be opposite to the phase of the external noise signal.

Accordingly, the voice signal of the user may be transmitted through the open groove 161 of the cover 160, the open part 111 of the housing 110, and the second through groove 144 of the soundproof member 140 through the ear canal. The input terminal 231 of the microphone 230 is provided. In addition, the voice signal of the user is provided to the back-hole 234 of the first microphone 230 through the third through hole 145.

The signal processor 270 receives the output signal of the first microphone 230 and the output signal of the second microphone 235, and uses the output signal of the second microphone 235 to transmit the signal of the first microphone 230. The noise signal included in the output signal can be eliminated.

The ear microphone 2000 may be implemented by using a Bluetooth technology. In this case, the microphone 2000 may not include the connector 10.

FIG. 13 is a partially enlarged view of the ear microphone shown in FIG. 12, and FIG. 14 is a left side view of the soundproof member shown in FIG. 12. That is, FIG. 14 shows the external appearance of the sound insulation member 140 seen from the ear canal side.

12 to 14, the soundproof member 140 is formed in a cylindrical shape with a step (stepped shape), the speaker accommodating groove 141 and the first microphone 230 for arranging the speaker 220 inside. ) Is provided with a first microphone receiving groove 142. Here, the speaker accommodating groove 141 and the first microphone accommodating groove 142 are the speaker 220 and the first microphone 230 in order to minimize the vibration caused by the external impact or the mechanical vibration generated in the mechanism inside the main body 200. ).

In addition, a first through hole 143 is formed at the left side of the speaker accommodating groove 141, that is, at the center of the opposing ear canal to transmit the voice signal output from the speaker 220 to the ear canal. In addition, a second through hole 144 is formed at a position corresponding to the first microphone accommodating groove 142. The first microphone 230 may receive a user's voice signal transmitted from the ear canal through the second through hole 144.

According to an embodiment, the first microphone 230 may be a capacitor microphone including the back-hole 234. The back-hole 234 of the first microphone 230 is located on the opposite side of the input terminal 231 of the first microphone 230. At this time, the soundproof member 140 is formed with a third through hole 145 for providing a user's voice signal to the back-hole 234 of the first microphone 230.

12 through 14, the third through hole 145 is located between the first through hole 143 and the second through hole 144, but the present invention is limited to the position of the third through hole 145. The plurality of third through holes 145 may be implemented. In addition, the third through hole 145 may be implemented to communicate with the speaker receiving groove 141.

In addition, although the first microphone 230 illustrated in FIG. 14 is implemented in a square shape, the shape of the first microphone 230 may be circular or polygonal.

FIG. 15 is a block diagram of some components of the ear microphone shown in FIG. 12.

12 to 15, the ear microphone 2000 includes a first microphone 230, a second microphone 235, and a signal processor 270.

The first microphone 230 converts a user's voice signal into an electrical signal and outputs the converted electrical signal. The output signal of the first microphone 230 includes a voice signal s (t) and a noise signal n1 (t).

The second microphone 235 converts an external noise signal into an electrical signal and outputs the converted electrical signal. The phase of the output signal -n2 (t) of the second microphone 235 is opposite to that of the external noise signal.

The signal processor 270 receives the output signal of the first microphone 230 and the output signal of the second microphone 235 (-n2 (t)), and outputs the signal of the second microphone 235 (-n2 ( t)) may remove the noise signal n1 (t) included in the output signal of the first microphone 230. Therefore, the signal processor 270 may output only the voice signal s (t) included in the output signal of the first microphone 230. According to an embodiment, the signal processor 270 may output the voice signal K * s (t) amplified by K times.

FIG. 16 is an embodiment of the signal processor shown in FIG. 15.

12 to 16, the signal processor 271 includes an adder 286. The signal processor 271 may further include a first filter 280, a second filter 282, and a third filter 288.

The first filter 280 filters the output signal of the first microphone 230, and the second filter 282 filters the output signal of the second microphone 235.

The adder 286 adds the output signal of the first filter 280 and the output signal of the second filter 282. The noise signal n1 (t) included in the output signal of the first filter 280 is canceled by the output signal of the second filter 282. Therefore, the adder 286 may output an output signal including only the voice signal s (t).

The third filter 288 filters the output signal of the adder 286.

FIG. 17 is a circuit diagram of the first filter illustrated in FIG. 16.

12 to 17, the first filter 280 may include a first capacitor C1, a first resistor R1, and a serial connection between the input terminal 280-1 and the output terminal 280-2. It includes a second resistor (R2). In addition, the first filter 280 is the second capacitor C2 and the first filter 280 connected between the common node 280-3 of the first resistor R1 and the second resistor R2 and the ground terminal. And a third capacitor C3 connected between the output terminal 280-2 and the ground terminal.

The first filter 280 removes the DC component included in the output signal of the first microphone 230 by using the first capacitor C1, and uses the second capacitor C2 and the third capacitor C3. The high frequency noise signal included in the output signal of the first microphone 230 may be removed.

In addition, the first filter 280 may be connected between the first microphone 230 and the adder 286 to perform impedance matching.

The structure and operation of the second filter 282 are the same as the structure and operation of the first filter 280.

FIG. 18 is a circuit diagram of the third filter illustrated in FIG. 16.

12 through 16 and 18, the third filter 288 may include a third resistor R3 and an output terminal 288-2 connected between the input terminal 288-1 and the output terminal 288-2. And a fourth capacitor C4 connected between the ground terminal and the ground terminal.

The third filter 288 may remove the high frequency noise included in the output signal of the adder 286 using the fourth capacitor C4. In addition, the third filter 288 may be connected between the adder 286 and the connector 10 to perform impedance matching.

FIG. 19 is another embodiment of the signal processor shown in FIG. 15.

12, 15, and 19, the signal processor 272 includes an amplifier 284, and an adder 286. The signal processor 272 may further include a first filter 280, a second filter 282, and a third filter 288.

The amplifier 284 amplifies the output signal of the first filter 280. That is, the amplifier 284 amplifies the output signal of the first filter 280 by K times. The output signal of the amplifier 284 includes a voice signal K * s (t) and a noise signal K * n1 (t). Here, K may have a predetermined value or may have a value adjusted by a user.

As a result, the magnitude (or amplitude) of the noise signal K * n1 (t) included in the output signal of the amplifier 284 is the magnitude of the output signal -n2 (t) of the second filter 282. (Or, amplitude).

An adder 286 adds the output signal of the amplifier 284 and the output signal -n2 (t) of the second filter 282. Since the magnitude of the noise signal K * n1 (t) included in the output signal of the amplifier 284 is equal to the magnitude of the output signal -n2 (t) of the second filter 282, and its phase is opposite, The noise signal K * n1 (t) is canceled by the output signal -n2 (t) of the second filter 282. Therefore, the output signal of the adder 286 includes only the audio signal K * s (t).

The third filter 288 filters the output signal of the adder 286.

FIG. 20 is another embodiment of the signal processor shown in FIG. 15.

12, 15, and 20, the signal processor 274 includes an amplifier 284, a gain regulator 289, and an adder 286. The signal processor 274 may further include a first filter 280, a second filter 282, and a third filter 288.

The gain regulator 289 receives the output signal of the amplifier 284 and the output signal of the second filter 282 (-n2 (t)), and the output signal of the second filter 282 (-n2 (t)). The gain of the amplifier 284 may be controlled to have the same magnitude as and the magnitude of the noise signal K * n1 (t) included in the output signal of the amplifier 284. That is, the gain adjuster 289 may adjust the value of K such that the amplitude of the noise signal K * n1 (t) and the amplitude of the output signal -n2 (t) of the second filter 282 are the same. .

FIG. 21 is yet another embodiment of the signal processor shown in FIG. 15.

12, 15, and 21, the signal processor 276 includes an amplifier 284, a gain adjuster 289, and an adder 286. The signal processor 276 may further include a first filter 280, a second filter 282, and a third filter 288.

The gain regulator 289 receives the output signal of the first filter and the output signal of the second filter 282 (-n2 (t)), and receives the output signal of the second filter 282 of the output signal (-n2 (t)). The gain K of the amplifier 284 may be controlled so that the magnitude equals the magnitude of the noise signal K * n1 (t) included in the output signal of the amplifier 284.

Referring to FIG. 22, the ear microphone 3000 includes a connector 10 coupled to the external device 1 and a body 300 worn on the user's ear. The connector 10 and the main body 300 are electrically coupled through the cable (C).

The main body 300 includes a housing 110 having a size that can be entered into the user's ear. The housing 110 may have a non-linear shape in which one side is bent. In addition, an opening 111 for inputting and outputting a voice signal is formed at a central portion of the housing 110 opposite to the outer ear canal. Inside the housing 110, a speaker 320, a second microphone 330, and a first microphone 335 are provided.

The second microphone 330 converts a user's voice signal provided through the ear canal into an electrical signal and outputs the electrical signal to the connector 10.

According to an embodiment, the second microphone 330 may be embodied as a capacitor microphone including a back hole 334. In this case, the second microphone 330 has an effect of amplifying and outputting a user's voice signal. In addition, the second microphone 330 including the back-hole 334 has a bidirectional characteristic and a noise resistant characteristic.

The first microphone 335 converts an external noise signal into an electrical signal. The first microphone 335 is located opposite the opening 111 of the housing 110. In addition, the side of the housing 110 is provided with an external through groove 112 for providing the external noise signal to the first microphone 335. The first microphone 335 may be arranged such that an input end thereof faces the external through groove 112, and may receive the external noise signal provided through the external through groove 112.

In addition, the left side of the first microphone 335, that is, the outer ear canal facing surface is surrounded by the soundproofing member 140. Therefore, the external noise signal is blocked from flowing into the soundproof member 140, and the first microphone 335 is fixedly supported by the soundproof member 140.

The first microphone 335 converts the external noise signal into an electrical signal and transmits the electrical signal to the signal processor 370. In this case, the phase of the output signal of the first microphone 335 may be opposite to the phase of the external noise signal.

The signal processor 370 receives the output signal of the first microphone 335 to filter the output signal, and outputs the filtered signal and an electrical signal provided through the connector 10 from an external device 1 such as a mobile phone. Add and output.

The speaker 320 converts an output signal of the signal processor 370 into a voice signal and outputs the voice signal. The voice signal output from the output terminal 321 of the speaker 320 includes the first through hole 143 of the soundproofing member 140, the opening part 111 of the housing 110, and the opening groove 161 of the cover 160. Through the ear canal).

Therefore, the noise signal introduced into the ear canal through the cover 160 or the housing 110 may be removed. The noise signal introduced into the ear canal refers to a noise signal existing in space. That is, the noise signal included in the output signal of the speaker 320 and the noise signal introduced into the ear canal may be canceled in space, that is, in the ear canal.

The speaker 320 and the second microphone 330 are disposed in parallel to each other, and the speaker 320 and the second microphone 330 are fixedly supported inside the housing 110 by a soundproof member 140 for supporting them. do. In this case, the output terminal 321 of the speaker 320 and the input terminal 331 of the second microphone 330 are disposed to face in the same direction. That is, the speaker 320 is disposed such that the output terminal 321 faces the opening 111 of the housing 110, and the second microphone 330 has the input terminal 331 of the opening 111 of the housing 110. It is arranged to face. Accordingly, the speaker 320 is disposed such that the output terminal 321 faces the opposite surface of the ear canal, and the second microphone 330 is disposed such that the input terminal 331 faces the opposite surface of the ear canal.

The soundproof member 140 illustrated in FIG. 22 is a single layer, but in some embodiments, the soundproof member 140 for noise shielding may be configured in a multilayer. In addition, the soundproof member 140 may be separated into a plurality of pieces to facilitate the assembly of the ear microphone 3000.

The outer ear canal side of the housing 110 is provided with a cover 160 for allowing the ear microphone 3000 to closely contact the user's ear. The cover 160 surrounds a part of the outer ear canal side of the housing 110, and a plurality of protrusions 162 are formed at an outer side thereof, and an opening groove 161 communicating with the opening 111 of the housing 110 at a central portion thereof. ) Is formed. At this time, the cover 160 is in close contact with the user's ear, it may be made of a material having a soft touch, for example, silicon.

Accordingly, the voice signal of the user may be transmitted through the open groove 161 of the cover 160, the open part 111 of the housing 110, and the second through groove 144 of the soundproof member 140 through the ear canal. The input terminal 331 of the microphone 330 is provided. In addition, the voice signal of the user is provided to the back-hole 334 of the second microphone 330 through the third through hole 145.

The ear microphone 3000 according to the present invention may be implemented using a Bluetooth technology. In this case, the ear microphone 3000 may not include the connector 10.

FIG. 23 is a partially enlarged view of the ear microphone shown in FIG. 22, and FIG. 24 is a left side view of the soundproof member shown in FIG. 22. That is, FIG. 24 shows the external appearance of the soundproof member 140 seen from the ear canal side.

22 to 24, the soundproof member 140 is formed in a cylindrical shape with a step (stepped shape), and a speaker accommodating groove 141 and a second microphone 330 for arranging the speaker 320 therein. ) Is provided with a microphone accommodating groove 142. Here, the speaker accommodating groove 141 and the microphone accommodating groove 142 may connect the speaker 320 and the second microphone 330 in order to minimize the vibration caused by the external impact or the mechanical vibration generated in the mechanism inside the main body 300. Fix it.

A first through hole 143 is formed at the left side of the speaker accommodating groove 141, that is, at the center of the opposing ear canal to transmit the voice signal output from the speaker 320 to the ear canal. In addition, a second through hole 144 is formed at a position corresponding to the microphone accommodating groove 142. Accordingly, the second microphone 330 may receive a voice signal of the user transmitted from the ear canal through the second through groove 144.

According to an embodiment, the second microphone 330 may be a capacitor microphone including the back-hole 334. The back-hole 334 of the second microphone 330 is located on the opposite side of the input terminal 331 of the second microphone 330. At this time, the soundproof member 140 is formed with a third through hole 145 for providing a user's voice signal to the back-hole 334 of the second microphone 330.

The third through hole 145 illustrated in FIGS. 22 to 24 is located between the first through hole 143 and the second through hole 144, but the present invention is limited to the position of the third through hole 145. The plurality of third through holes 145 may be implemented. In addition, the third through hole 145 may be implemented to communicate with the speaker receiving groove 141. In addition, the opening 111 of the housing 110 may include a plurality of holes corresponding to each of the first through hole 143, the second through hole 144, and the third through hole 145.

FIG. 25 is a block diagram of some components of the ear microphone shown in FIG. 22.

22 to 25, the ear microphone 3000 includes a first microphone 335, a signal processor 370, and a speaker 320.

The first microphone 335 converts an external noise signal into an electrical signal and outputs the electrical signal. The phase of the output signal -n1 (t) of the first microphone 335 is opposite to that of the external noise signal.

The signal processor 370 receives and filters the output signal (-n (t)) of the first microphone 335, and adds the filtered signal and the electrical signal s1 (t) provided from the external device 1. do.

The speaker 320 converts an output signal of the signal processor 370 into a voice signal and outputs the voice signal. In this case, the noise signal introduced into the ear canal through the cover 160 or the housing 110 is canceled in space, that is, within the ear canal with the noise signal included in the output signal of the speaker 320.

Therefore, the ear microphone 3000 according to the present invention can prevent the user's hearing loss by removing the noise signal introduced into the ear canal within the ear canal.

In addition, since the noise signal introduced into the ear canal is removed within the ear canal, the second microphone 330 can convert only the voice signal of the user provided from the ear canal into an electrical signal. That is, the output signal of the second microphone 330 does not include a noise signal component.

FIG. 26 is a block diagram of the signal processor shown in FIG. 25.

22 to 26, the signal processor 370 includes a filter 372 and an adder 374.

The filter 372 filters the output signal -n1 (t) of the first microphone 335. The gain K of the filter 372 may be a value greater than zero and less than one. Since the output signal (-n (t)) of the first microphone 335 is an electrical signal obtained by converting an external noise signal provided through the external through groove 112, the magnitude (or amplitude) of the first microphone 335 is greater than that of the noise signal introduced into the ear canal. Because of the size.

The adder 374 adds the output signal (-K * n1 (t)) of the filter and the electrical signal s1 (t) provided from the external device 1.

FIG. 27 is a circuit diagram of the filter shown in FIG. 26.

22 to 27, the filter 372 includes a first capacitor C1 and a first resistor R2 connected in series between the input terminal 372-1 and the output terminal 372-2. In addition, the filter 372 is an output terminal 372 of the second resistor R1 and the filter 372 connected between the common node 372-3 of the first resistor R2 and the first capacitor C1 and the ground terminal. -3) and a third resistor (R3) connected between the ground terminal.

The filter 372 may remove the DC component included in the output signal -n1 (t) of the first microphone 335. In addition, the gain K of the filter 372 may be adjusted according to device values of elements included in the filter 372. In this case, the gain K may be a value greater than zero and less than one. Accordingly, the magnitude (or amplitude) of the output signal (-K * n1 (t)) of the filter 372 may be smaller than the magnitude (or amplitude) of the output signal (-n1 (t)) of the first microphone 335. have.

In addition, the filter 372 may be connected between the first microphone 335 and the adder 374 to perform impedance matching.

In the following, the description overlapping with the above is omitted and the difference is described.

Referring to FIG. 28, the ear microphone 4000 includes a connector 10 coupled to the external device 1 and a main body 400 worn on the user's ear. At this time, the connector 10 and the main body 400 are electrically coupled through the cable (C).

The main body 400 includes a housing 110 having a size that can be entered into the user's ear. Inside the housing 110, a speaker 420, a second microphone 430, and a first microphone 437 are provided.

The second microphone 430 converts the voice signal of the user provided through the ear canal into an electrical signal and outputs the electrical signal to the external device 1 through the connector 10.

The first microphone 437 converts the voice signal of the user and the noise signal introduced into the ear canal into an electrical signal and outputs the signal to the signal processor 470. The phase of the output signal of the first microphone 437 may be opposite to the phase of the voice signal of the user and the phase of the noise signal introduced into the ear canal.

The first microphone 437 may be disposed on an opposite side of the input terminal 431 of the second microphone 430, and may be disposed in line with the second microphone 430. Therefore, the second microphone 430 and the first microphone 437 may be disposed in a straight line with the microphone receiving groove 142 of the soundproofing member 140. In this case, the second microphone 430 may be disposed on the outer ear side of the microphone accommodating groove 142, and the first microphone 437 may be disposed on the right side of the second microphone 430. In addition, the second microphone 430 is disposed such that the input terminal 431 faces the ear canal, and the first microphone 437 is disposed such that the input terminal 439 faces the opposite direction of the ear canal. However, the ear microphone 4000 of the present invention is not limited to the position of the first microphone 437, and the position of the first microphone 437 is changeable inside the soundproofing member 140.

The signal processor 470 receives the output signal of the first microphone 437 and filters the output signal, and adds and outputs the filtered signal and an electrical signal provided through the connector 10 from the external device 1. .

The speaker 420 converts the output signal of the signal processor 470 into a voice signal and outputs the voice signal. The voice signal output from the output terminal 421 of the speaker 420 may include a first through hole 143 of the soundproofing member 140, an opening 111 of the housing 110, and an opening 161 of the cover 160. Through the ear canal).

Accordingly, the speaker 420 may remove the spatial noise signal introduced into the ear canal through the cover 160 or the housing 110 by converting and outputting the output signal of the signal processor 470 into a voice signal. Therefore, the noise signal included in the output signal of the speaker 420 and the noise signal introduced into the ear canal cancel each other in space, that is, within the ear canal.

FIG. 29 is a block diagram of some components of the ear microphone shown in FIG. 28.

28 to 29, the ear microphone 4000 includes a first microphone 437, a signal processor 470, and a speaker 420.

The first microphone 437 converts the voice signal of the user provided through the ear canal and the noise signal introduced into the ear canal into an electrical signal and outputs the electrical signal. The phase of the output signal of the first microphone 437 is opposite to the phase of the voice signal and the noise signal of the user. That is, the output signal of the first microphone 437 includes a voice signal component (-s2 (t)) and a noise signal component (-n2 (t)).

The signal processor 470 receives and filters the output signal of the first microphone 437, and adds the filtered signal and the signal s1 (t) provided from the external device 1.

The speaker 420 converts the output signal of the signal processor 470 into a voice signal and outputs the voice signal. At this time, the spatial noise signal introduced into the external ear canal through the cover 160 or the housing 110 from the outside is canceled with each other in the space and the noise signal component included in the output signal of the speaker 420.

FIG. 30 is an embodiment of the signal processor shown in FIG. 29.

28 through 30, the signal processor 470 includes a filter 477 and an adder 479.

The filter 477 filters the output signal of the first microphone 437. That is, the filter 477 may remove the voice signal component (-s2 (t)) included in the output signal of the first microphone 437. Thus, the output signal of the filter 477 includes only the noise signal component (-n2 (t)).

The adder 479 adds the output signal -n2 (t) of the filter 477 and the electrical signal s1 (t) provided from the external device 1.

FIG. 31 is a circuit diagram of the filter shown in FIG. 30.

28 to 31, the filter 477 includes a second capacitor C2 and a third capacitor C3 connected in series between the input terminal 477-1 and the output terminal 477-2. In addition, the filter 477 is an output terminal 477 of the fourth resistor R4 and the filter 477 connected between the common node 477-3 of the second capacitor C2 and the third capacitor C3 and the ground terminal. -5) and a fifth resistor (R5) connected between the ground terminal.

The filter 477 may remove the voice signal component (-s2 (t)) included in the output signal of the first microphone 437 and pass only the high frequency signal, that is, the noise signal component (-n2 (t)). .

In addition, the filter 477 may be connected between the first microphone 437 and the adder 479 to perform impedance matching.

Although the present invention has been described with reference to one embodiment shown in the drawings, this is merely exemplary, and those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

The present invention can be used for earmicrophones.

Claims

A first microphone for converting a user's voice signal into a first electrical signal;

A second microphone for converting the voice signal of the user into a second electrical signal;

A third microphone for converting an external noise signal into a third electrical signal; And

And a signal processor configured to add the first electrical signal and the second electrical signal, and to remove a noise signal included in the added electrical signal by using the third electrical signal.
The method of claim 1,

An ear microphone in which the phase of the third electrical signal is opposite to the phase of the external noise signal.
The method of claim 1,

The third microphone is an ear microphone for receiving the external noise signal through a hole through the housing of the ear microphone.
The method of claim 1,

The signal processor,

A first adder for adding the first electrical signal and the second electrical signal; And

And a second adder for adding the output signal of the first adder and the third electrical signal.
The method of claim 4, wherein

The signal processor further comprises a filter for filtering the output signal of the second adder.
The method of claim 1,

The signal processor,

A first adder for adding the first electrical signal and the second electrical signal;

A first filter for filtering the output signal of the first adder;

A second filter for filtering the third electrical signal; And

And a second adder for adding the output signal of the first filter and the output signal of the second filter.
The method of claim 1,

The signal processor,

A first adder for adding the first electrical signal and the second electrical signal;

A first filter for filtering the output signal of the first adder;

A second filter for filtering the third electrical signal;

An amplifier for amplifying the output signal of the first filter; And

And a second adder for adding the output signal of the amplifier and the output signal of the second filter.
The method of claim 7, wherein

The signal processor receives the output signal of the amplifier and the output signal of the second filter, and the magnitude of the noise signal included in the output signal of the amplifier is equal to the magnitude of the output signal of the second filter. And a gain regulator for controlling the gain of the amplifier.
The method of claim 7, wherein

The signal processor receives the output signal of the first filter and the output signal of the second filter, and the magnitude of the noise signal included in the output signal of the amplifier and the magnitude of the output signal of the second filter And a gain regulator for controlling the gain of the amplifier to be equal.
The method of claim 9,

The signal processor further comprises a third filter for filtering the output signal of the second adder.
A first microphone for converting a user's voice signal into a first electrical signal;

A second microphone for converting an external noise signal into a second electrical signal; And

And a signal processor configured to receive the first electrical signal and the second electrical signal and to remove a noise signal included in the first electrical signal using the second electrical signal.
The method of claim 11,

The phase of the second electrical signal is opposite to the phase of the external noise signal.
The method of claim 11,

The second microphone is an ear microphone for receiving the external noise signal through a hole through the housing of the ear microphone.
The method of claim 12,

The signal processor includes an adder for adding the first electrical signal and the second electrical signal.
The method of claim 12,

Wherein the first microphone is a capacitor microphone including a back hole.
The method of claim 14,

The signal processor further comprises a filter for filtering the output signal of the adder.
The method of claim 12,

The signal processor,

A first filter for filtering the first electrical signal;

A second filter for filtering the second electrical signal;

An amplifier for amplifying the output signal of the first filter; And

And an adder for adding an output signal of the amplifier and an output signal of the second filter.
The method of claim 17,

The signal processor further comprises a third filter for filtering the output signal of the adder.
The method of claim 17,

The signal processor,

A gain of the amplifier such that the output signal of the amplifier and the output signal of the second filter are received and the magnitude of the output signal of the second filter is equal to the magnitude of the noise signal included in the output signal of the amplifier Ear microphone further comprising a gain adjuster for controlling the.
The method of claim 17,

The signal processor,

The amplifier receiving the output signal of the first filter and the output signal of the second filter, and the amplitude of the noise signal included in the output signal of the amplifier equal to the magnitude of the output signal of the second filter An ear microphone further comprising a gain adjuster for controlling the gain of the.
The method of claim 17,

Wherein the first microphone is a capacitor microphone including a back-hole.
A first microphone for converting an external noise signal into a first electrical signal;

A signal processor for filtering the first electrical signal and adding the filtered signal and a second electrical signal provided from an external device; And

Ear microphone comprising a speaker for converting the output signal of the signal processor to a voice signal for output.
The method of claim 22,

The ear microphone further comprises a second microphone for converting a user's voice signal provided through the ear canal into a third electrical signal.
The method of claim 22,

And wherein the phase of the first electrical signal is opposite to the phase of the external noise signal.
The method of claim 23, wherein

Wherein said second microphone is a capacitor microphone comprising a back hole.
The method of claim 22,

The first microphone is an ear microphone for receiving the external noise signal through a hole through the housing of the ear microphone.
The method of claim 22,

The signal processor,

A filter for filtering the first electrical signal; And

And an adder for adding the output signal of the filter and the second electrical signal.
In the ear microphone,

A first microphone converting a user's voice signal provided through the ear canal and the noise signal introduced into the ear canal into a first electrical signal;

A signal processor for filtering the first electrical signal and adding the filtered signal and a second electrical signal provided from an external device; And

Ear microphone comprising a speaker for converting the output signal of the signal processor to a voice signal for output.
The method of claim 28,

The ear microphone further comprises a second microphone for converting the voice signal of the user into a third electrical signal.
The method of claim 28,

Wherein the phase of the first electrical signal is opposite to the phase of the user's voice signal and the noise signal.
The method of claim 28,

The signal processor,

A filter for filtering the first electrical signal; And

And an adder for adding the output signal of the filter and the second electrical signal.
The method of claim 31, wherein

The filter removes the voice signal component of the user included in the first electrical signal.