KR101898911B1 - Noise cancelling method based on sound reception characteristic of in-mic and out-mic of earset, and noise cancelling earset thereof - Google Patents

Noise cancelling method based on sound reception characteristic of in-mic and out-mic of earset, and noise cancelling earset thereof Download PDF

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KR101898911B1
KR101898911B1 KR1020170019335A KR20170019335A KR101898911B1 KR 101898911 B1 KR101898911 B1 KR 101898911B1 KR 1020170019335 A KR1020170019335 A KR 1020170019335A KR 20170019335 A KR20170019335 A KR 20170019335A KR 101898911 B1 KR101898911 B1 KR 101898911B1
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noise
ear
ear microphone
voice
microphone
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KR1020170019335A
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KR20180093363A (en
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김은동
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주식회사 오르페오사운드웍스
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Priority to KR1020170019335A priority Critical patent/KR101898911B1/en
Priority to PCT/KR2018/001020 priority patent/WO2018147573A1/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones
    • H04R1/1083—Reduction of ambient noise
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R3/00—Circuits for transducers, loudspeakers or microphones
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R3/00—Circuits for transducers, loudspeakers or microphones
    • H04R3/005—Circuits for transducers, loudspeakers or microphones for combining the signals of two or more microphones

Abstract

A noise canceling earset and a noise canceling method using an in-ear microphone and an out-of-ear microphone sound-absorbing characteristic are disclosed. The noise canceling earset and the noise canceling method using the in-ear microphone and the out-of-ear microphone according to the present invention extract noise by removing the user's voice from the in-ear microphone signal and the out- The microphone is calibrated to calculate the noise correction value to be applied to each interrelationship, and the user's voice is restored by removing the calibrated actual noise from the in-ear microphone and the out-of-ear microphone, respectively. According to the present invention, the user's voice can be more clearly output by correcting it with actual noise in consideration of the hardware characteristics and the environmental characteristics from the internal noise and the external noise, which are provided inside and outside, respectively. Therefore, the voice of the user can be clearly communicated to the other party regardless of the earset shape, the wearing state of the earphone, and the very noisy place such as the performance hall.

Description

TECHNICAL FIELD The present invention relates to a noise canceling method and a noise canceling method using an in-ear microphone and an out-of-ear microphone, and more particularly to a noise canceling method and a noise canceling method,

The present invention relates to a noise canceling technique of an earset. More specifically, the present invention relates to a technique for eliminating noise and leaving only a user's voice by using a difference in sound reception characteristics of a microphone provided inside and outside, and an earset to which the technology is applied.

The earset is in the form of an earphone or a headphone, and is generally provided with two speakers and a microphone (hereinafter referred to as " microphone "). Here, the earset is defined as including an earphone, a headphone, a headset, and the like.

For example, if the user is listening to music while listening to an earset connected to a smartphone, the user can make a call through the speaker and the microphone when the phone is called. At this time, the microphone does not operate at the time of music reproduction, and when the call function is selected, the smart phone stops the music reproduction and operates the microphone to transmit the voice of the user to the calling party. At the same time, the voice of the other party is reproduced through the speaker of the earset to be heard to the user.

However, the Out-Ear Microphone attached to the earset has a problem in that the noise is mixed with the user's voice and the call quality is deteriorated.

An in-ear microphone has been proposed in which a microphone is positioned inside the user's ear.

However, in-ear mics also have limitations that can not completely eliminate noise. That is, noise may be input according to the shape of the earset, the wearing state of the earphone, and the like, and noises may be input in a very noisy place such as a theater. As a result, there is a problem that the user's voice is mixed with the noise and is not properly transmitted to the other party.

Literature 1. Korean Patent Application No. 10-2013-0042495, entitled " Methods, apparatus and computer readable mediums for processing speech signals using a head-mounted microphone pair &

SUMMARY OF THE INVENTION Accordingly, the present invention has been made to solve the above-mentioned problems occurring in the prior art, and it is an object of the present invention to provide an in-ear microphone and an out- And to provide a noise canceling earset and a noise canceling method using an in-ear microphone and an out-of-ear microphone.

To achieve the above object, there is provided a noise canceling earset using an in-ear microphone and an out-of-ear microphone according to the present invention, An in-ear microphone and an out-of-ear microphone formed inside the head; And a noise cancellation circuit for removing noise and restoring a user's voice by using differences in sound reception characteristics of the in-ear microphones and the out-of-ear microphones.

In this case, the noise canceling circuit may include: a noise extractor for removing noise from the voice and noise input to the in-ear microphones and the out-of-ear microphones to extract noise; A corrector for calculating and correcting a noise correction value to be applied to each of the mutual relations of the in-ear microphone and the out-of-ear microphone; And a voice restoring unit for restoring the user's voice by removing the actual noise corrected from the in-ear microphone and the out-of-ear microphone signal, respectively.

In addition, it is preferable that a parameter compensating unit is provided between the in-ear microphone and the noise extracting unit for expanding the bandwidth of the low-frequency sound transmitted through the external ear canal and converting each parameter to a signal similar to the external sound.

Meanwhile, the noise elimination method using an in-ear microphone and an out-of-ear microphone sound-taking characteristic of the present invention preferably includes: extracting noises from an in-ear microphone signal and an out-of- Calculating a noise correction value to be applied to each of the mutual relationships of the in-ear microphones and the out-of-ear microphones, and correcting the noises; And recovering the user's voice by removing the corrected actual noise from the in-ear microphone and the out-of-ear microphone signal, respectively.

At this time, it is preferable that the noise correction value reflects at least one of the microphone hardware characteristic data, the data measured at the time of correction, and the value corrected by calculating in the reverse direction of the signal processing of the microphone. Meanwhile, the noise correction values to be applied to the in-ear microphones and the out-of-ear microphones may be in a complementary relation with respect to the reference points.

The removal of the user's voice is performed by extending the bandwidth for the low-frequency portion of the internal voice transmitted through the external ear canal, converting each parameter obtained through the expansion to a signal similar to the external voice, Can be accomplished through liver cancellation.

As described above, according to the noise canceling earset and the noise canceling method using the in-ear microphone and the out-of-ear microphone according to the present invention, the hardware characteristics and the environment Characteristics, and the like, it is corrected by the actual noise and removed, so that the user's voice can be outputted more clearly.

Therefore, the voice of the user can be clearly communicated to the other party regardless of the earset shape, the wearing state of the earphone, and the very noisy place such as the performance hall.

1 is a configuration diagram of a noise removing earset according to an embodiment of the present invention.
2 is a block diagram of a control circuit of a noise canceling circuit according to an embodiment of the present invention.
3 is a flowchart of a noise reduction method according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Hereinafter, the present invention will be described in detail with reference to preferred embodiments of the present invention and the accompanying drawings, wherein like reference numerals refer to like elements.

It is to be understood that when an element is referred to as being "comprising" another element in the description of the invention or in the claims, it is not to be construed as being limited to only that element, And the like.

Also, in the description of the invention or the claims, the components named as "means", "parts", "modules", "blocks" refer to units that process at least one function or operation, Each of which may be implemented by software or hardware, or a combination thereof.

Hereinafter, an embodiment in which the noise canceling earset and the noise canceling method using the in-ear microphone sound receiving characteristics of the present invention are implemented will be described with reference to specific embodiments.

1 is a configuration diagram of a noise removing earset according to an embodiment of the present invention.

1, the noise canceling earphone of the present invention includes a first head 1 and a second head 2 that are worn on a user's ear, and a first head 1 and a second head 2 mounted on the first head 1 and the second head 2, respectively. An in-ear microphone 3 installed in the first head 1 which is one of the two heads and an out- put microphone 4 installed in the second head 2 which is the other of the two heads.

When the noise-canceling earset of the present invention having the above-described structure is put on the ear of the user, the ear microphone 3 is positioned in the ear canal of the user. Of course, the out-of-ear microphone 4 is located outside the external ear canal.

At this time, as the in-ear microphone 3 is worn on the user's ear canal, the voice transmitted through the ear canal can be captured more efficiently. That is, the voice of the user may go out of the mouth but is transmitted through the eardrum to the ear, so that the voice can be captured through the ear microphone 3 and the external noise can be blocked. If you close your ears and talk, your voice will be heard and the external noise will be blocked.

The present invention corrects actual noise with actual noise in consideration of hardware characteristics and environmental characteristics from internal noise and external noise, which are respectively provided inside and outside, and removes the corrected actual noise from a signal input to the microphone. Thus, since the actual noise inputted by various conditions is removed, the user's voice can be more clearly restored.

On the other hand, in the present embodiment, the case where the inductive microphone 3 is formed on the first head 1 and the out-microphone 4 is formed on the second head 2 is described, The in-ear microphones 3 and the out-of-ear microphones 4 may be mounted on the same head. Although two heads are illustrated in the present embodiment, the in-ear microphones 3 and the out-of-ear microphones 4 may be provided in one head. The headset may be configured as a wireless (Bluetooth) earset attached to one ear, an in-ear microphone 3 formed inside and an outdoor microphone 4 exposed to the outside .

2 is a block diagram of a control circuit of a noise canceling circuit according to an embodiment of the present invention.

Referring to FIG. 2, the noise canceling circuit 5 of the present invention includes a noise extracting unit 5 for extracting noises from voice and noise inputted to the in-ear microphones 3 and the out- A correction unit 52 for calculating and correcting a noise correction value to be applied to each interrelationship between the in-ear microphone 3 and the out-of-ear microphone 4, And a voice restoring unit 53 for restoring the user's voice by removing the corrected actual noises, respectively.

Here, a parameter compensating unit may be formed between the in-ear microphone 3 and the noise extracting unit 51 for expanding the bandwidth of the low frequency sound transmitted through the external ear canal and converting each parameter to a signal similar to the external sound.

In the thus constructed noise canceling circuit 5 of the present invention, the noise extracting unit 51 extracts the correlation between the external noise and the internal noise from the correlation between the in-ear microphone signal and the out-of-ear microphone signal. At this time, the voice is removed. In the parameter compensating unit, the signal of the in-ear microphone 3 is converted into a signal similar to that of the out-of-ear microphone 4, and voice is removed through mutual difference calculation. Next, in the correcting section 52, in consideration of the hardware characteristics of the in-ear microphones 3 and the out-of-ear microphones 4, and the signal processing algorithm, The noise correction value to be applied is calculated, and the calculated noise correction value is applied to the noise calculated by the correlation between the in- ear microphone 3 and the out- put microphone 4. The voice restoration unit 53 restores the inner voice by removing the actual inner noise from the in-ear microphone signal, and restores the outer voice by removing the actual outside noise from the out-of-ear microphone signal. Then, the inner voice and the outer voice are synthesized and transmitted to the other party.

Hereinafter, a method of eliminating noise using the noise canceling earset constructed as described above will be described.

3 is a flowchart of a noise reduction method according to an embodiment of the present invention.

First, an object to be input to the in-ear microphone 3 is defined as an internal sound and internal noise, and an object input to the out-of-ear microphone 4 is defined as an external sound and external noise.

3, when voice and noise are input to the in-ear microphones 3 and the out-side microphones 4, the in-ear microphones 3 and the out- (4) outputs an in-ear microphone signal and an out-of-ear microphone signal through signal processing, and extracts only a noise component by removing a user voice from an in-ear microphone signal and an out-of-ear microphone signal (S1).

In this case, since the internal voice transmitted through the ear canal is composed of a low-frequency component hardly containing high-frequency components, the parameters are compensated through a bandwidth extension to the low-frequency range and converted into a signal similar to the external voice.

Accordingly, since the converted internal voice and the external voice have very similar characteristics, the voice of the user can be removed through the offset between the converted internal voice and the external voice.

As a result, the correlation between the external noise and the internal noise can be extracted from the correlation between the in-ear microphone signal and the out-of-ear microphone signal, as shown in (Equation 3).

Figure 112017014504736-pat00001
--- (1)

Figure 112017014504736-pat00002
--- (Equation 2)

Figure 112017014504736-pat00003
--- (Equation 3)

(Equation 3)

Figure 112017014504736-pat00004
The noise is extracted for the mutual relationship of the noise,
Figure 112017014504736-pat00005
The noise is also extracted.

At this time, the external noise and the internal noise may have different characteristics because the difference of the frequency band inputted to the microphone and the signal processing may be different from each other.

Then, a correction operation for the noise obtained in (Equation 3) is performed (S2).

That is, considering the hardware characteristics of the in-ear microphones 3 and the out-of-ear microphones 4, and the signal processing algorithm, the noise correction values to be applied to the mutual relationships between the in- ear microphone 3 and the out- .

Figure 112017014504736-pat00006
--- (Equation 4)

Here, the microphone hardware characteristics may include data previously measured at the time of shipment, and the environmental characteristics may include data measured at the time of calibration. On the other hand, the signal processing algorithm may include a calibrated value by operating in the reverse direction of the signal processing of each microphone.

Next, the noise and the correction value obtained from the correlation between the in-ear microphone 3 and the out-door microphone 4 are calculated (S3).

In the case where the out-of-ear microphone 4 carries out an arithmetic operation on the in-ear microphone 3, the first correction value obtained through the above-described (Expression 4) is substituted and the out- When the difference is calculated, the second correction value obtained through the above-described expression (4) is substituted.

Figure 112017014504736-pat00007
--- (Equation 5)

Figure 112017014504736-pat00008
--- (Equation 6)

As a result, real external noise and real internal noise can be obtained.

On the other hand, the relationship between the first correction value and the second correction value may be in a complementary relationship with respect to the reference point.

As a result, the original user's voice can be restored by removing the actual external noise and the actual internal noise restored from the in-ear microphone signal and the out-of-ear microphone signal (S4).

Figure 112017014504736-pat00009
--- (Equation 7)

Figure 112017014504736-pat00010
--- (8)

At this time, the user's external voice and internal voice can be combined or separately used, and the original user voice is transmitted to the other party.

The present invention may be implemented in a mobile device interfaced with a wired or wireless earpiece of the architecture illustrated in FIG. For example, a smart phone or a tablet computer.

On the other hand, after step S4, the restored user voice can be transmitted through the data communication network or the mobile communication network. The user's voice is transmitted to the other party's telephone or mobile terminal through the exchanger or Voip server.

According to the present invention, the calling party can hear the user's voice clearly even when the user is in a noisy place. In particular, the user voice is restored to be close to the original voice without being distorted.

The present invention can be applied to a wired / wireless earset, a Bluetooth earset technology mainly for voice communication.

As described above, the present invention can be applied to an earphone constituting the in-ear microphone 3 and the out-of-ear microphone 4, and thus can be realized as a new noise canceling technique different from the existing noise canceling algorithm. In other words, there is one microphone in the outside and one in the inside, and by utilizing the difference in sound reception characteristics of these two microphones, noise can be removed and only the user voice can be left.

The technical idea of the present invention has been described through several embodiments.

It will be apparent to those skilled in the art that various changes and modifications may be made to the embodiments described above from the description of the present invention. Further, although not explicitly shown or described, those skilled in the art can make various modifications including the technical idea of the present invention from the description of the present invention Which is still within the scope of the present invention. The above-described embodiments described with reference to the accompanying drawings are for the purpose of illustrating the present invention, and the scope of the present invention is not limited to these embodiments.

1: first head
2: second head
3: In-Ear Microphone
4: Outer microphone
5: Noise canceling circuit

Claims (7)

A head including a speaker;
An in-ear microphone and an out-of-ear microphone formed inside the head; And
And a noise canceling circuit for removing noise and restoring a user's voice by using difference in sound reception characteristics of the in-ear microphone and the out-
The noise canceling circuit includes:
A noise extractor for extracting noise from the voice and noise input to the in-ear microphones and the out-of-ear microphones by removing the voice;
A corrector for calculating and correcting a noise correction value to be applied to each of the mutual relations of the in-ear microphone and the out-of-ear microphone; And
And a voice restoring unit for restoring the user's voice by removing the corrected actual noise from the in-ear microphone and the out-of-ear microphone signal, respectively,
An in-ear microphone and an out-of-ear microphone are provided between the in-ear microphone and the noise extraction unit, in which a parameter compensation unit for expanding the bandwidth of the low-frequency sound transmitted through the ear canal and converting each parameter into a signal similar to the external sound Noise canceling earset.
delete delete A noise canceling method of a noise canceling earset using an in-ear microphone and an out-of-ear microphone sound-
Extracting noises from an in-ear microphone signal and an out-of-ear microphone signal by removing a user voice;
Calculating a noise correction value to be applied to each of the mutual relationships of the in-ear microphones and the out-of-ear microphones, and correcting the noises; And
And correcting the user's voice by removing the corrected actual noise from the in-ear microphone and the out-of-ear microphone signal, respectively,
The noise correction value may include at least one of an in-ear microphone and an out-of-ear microphone, which reflects at least one of the microphone hardware characteristic data, measured data at the time of correction, A method for noise reduction of an earset.
Extracting noises from an in-ear microphone signal and an out-of-ear microphone signal by removing a user voice;
Calculating a noise correction value to be applied to each of the mutual relationships of the in-ear microphones and the out-of-ear microphones, and correcting the noises; And
And correcting the user's voice by removing the corrected actual noise from the in-ear microphone and the out-of-ear microphone signal, respectively,
The removal of the user's voice is performed by extending the bandwidth to the low-frequency portion of the internal voice transmitted through the external ear canal, converting each parameter obtained through the expansion to a signal similar to the external voice, Noise canceling method of noise canceling earset using in - ear microphone and out - ear microphone sound - canceling through canceling.
The method according to claim 4 or 5,
Wherein the noise correction values to be applied to the in-ear microphones and the out-of-ear microphones are complementary with respect to a reference point. delete
KR1020170019335A 2017-02-13 2017-02-13 Noise cancelling method based on sound reception characteristic of in-mic and out-mic of earset, and noise cancelling earset thereof KR101898911B1 (en)

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PCT/KR2018/001020 WO2018147573A1 (en) 2017-02-13 2018-01-23 Noise removing earset using sound receiving characteristics of in-ear microphone and over-the-ear microphone, and noise removing method

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KR102569365B1 (en) 2018-12-27 2023-08-22 삼성전자주식회사 Home appliance and method for voice recognition thereof
KR102570384B1 (en) 2018-12-27 2023-08-25 삼성전자주식회사 Home appliance and method for voice recognition thereof
CN113163286A (en) * 2021-03-22 2021-07-23 九音(南京)集成电路技术有限公司 Call noise reduction method, earphone and computer storage medium
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