JP2013038455A - Noise reduction earphone microphone - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a noise reduction earphone microphone that is used for a call using a call device under a high noise environment and reduces noise to enable a call with clear voice.SOLUTION: A noise reduction earphone microphone includes: a body part 12 that is integrated with an ear chip 11 having a communication passage 11a to communicate with an external auditory canal and to be inserted to the external auditory canal and that is exposed to the outside of the external auditory canal when the ear chip 11 is inserted to the external auditory canal; a bone conduction speaker 18 mounted on the body part 12 and preventing an air vibration; and a microphone 17 where a voice collection part faces the communication passage 11a and which is mounted on the body part 12 in a non-contact state of preventing the transmission of a vibration generated by the bone conduction speaker 18.

Description

  The present invention relates to a noise-suppressing earphone microphone that is used for a call using a call device in a high-noise environment and that enables a call with clear voice while suppressing noise.

When talking in a high noise environment, the influence of noise is unavoidable, and in an environment where the noise level is 90 dB or higher, the conversation is almost impossible.
As an environment where the noise level is 90 dB or more, for example, the noise level is about 90 dB in the machine workshop, air conditioning machine room, printing factory, etc. For example, the noise level is under the overpass when passing through a train, in a subway car, a train station, etc. The noise level is about 110 dB near a factory siren, for example, and the noise level is about 120 dB at a subway station near an aircraft engine where the noise level is high.

Note that, for example, the noise level is about 80 dB along intersections and main roads, making conversation difficult. For example, theaters and department stores have a noise level of about 70 dB, and a little loud voice is required for conversation.
When making a call using a call device in such a high noise environment with a noise level of 90 dB or higher, the external noise is louder than the received sound volume, or the noise around the speaker is mixed in the uttered voice This makes it difficult to hear the other party's voice and makes the call difficult.
Therefore, using a cue by hand without using the communication device, using the communication device in combination with an earmuff for sound insulation (see Patent Document 1), or using a noise suppression type communication device is available. It was.

  As a noise-suppressing type communication device, there are a method using a bone conduction type earphone microphone and a method using an earphone microphone that amplifies air vibration generated in the ear hole during speech and converts it into voice. In the bone conduction method, the sound passes through the human skull, muscles or skin and reaches the earphone microphone, and the human skull, muscles or skin becomes the sound path, so that no noise enters the sound path. Noise that interferes with conversation can be suppressed. In the method of amplifying air vibration, an amplifier circuit is provided in a transmission / reception device.

JP 2000-023277 A

However, in the case of the bone conduction method, the sound that propagates in the air is input to the microphone without using an air diaphragm, and is also input through the human skull, muscles, and skin. As a result, the frequency characteristics of the sound propagation of the skull and the like become a sound that is biased toward the low range, so for example, “Mu” sounds like “U” and is difficult to hear.
In the case of the method of amplifying the air vibration, since the transmission / reception device is provided with an amplification circuit, an acoustic feedback system using reverberant echo is easily formed, and howling is likely to occur. Therefore, microphone output or speaker output is required to suppress howling. As a result, the volume of the incoming call is reduced, making it difficult to talk under high noise. Also, it is difficult to use a wide-band (high sensitivity) microphone because of howling. It is inevitable that the sound will be muffled with limited reproducibility.

  An object of the present invention is to provide a noise-suppressing earphone microphone that is difficult to be affected by external noise and is difficult to hear when making a call in a high noise environment, and that can secure a sufficient volume.

In order to achieve the above object, a noise suppressing earphone microphone according to the present invention is configured integrally with an ear tip having a communication path communicating with an ear canal and inserted into the ear canal, and the ear canal is inserted when the ear tip is inserted into the ear tip. A body part exposed outside, a bone conduction speaker mounted on the body part that does not generate air vibration, and a sound collection part that faces the communication path, so that vibration generated by the bone conduction speaker is not transmitted And a microphone attached to the main body in a non-contact state.
Further, in the noise suppressing earphone microphone according to another aspect of the present invention, the microphone includes a compression coil spring interposed between the concave portion opened in the communication path and the bottom surface of the concave portion, and between the inner peripheral surface of the concave portion. It arrange | positions through the elastic adhesive agent which adhere | attaches the said microphone to the said recessed part inner peripheral surface.

Further, a noise suppressing earphone microphone according to another aspect of the present invention is arranged such that the microphone is supported by a spike member that makes point contact with the bottom surface of the concave portion and the inner peripheral surface of the concave portion, in the concave portion that opens in the communication path. Yes.
Further, the noise suppressing earphone microphone according to another aspect of the present invention is configured such that the microphone is separated from the bottom surface of the concave portion and the inner peripheral surface of the concave portion in the shock absorbing member filled in the concave portion opened in the communication path, and the sound collecting portion. It is arrange | positioned at the said recessed part in the state embedded except.

  According to the noise-suppressing earphone microphone according to the present invention, the body portion that is integrally formed with the ear tip that has a communication path that communicates with the ear canal and is inserted into the ear canal, and is exposed to the outside of the ear canal when the ear tip is inserted into the ear canal. In addition to the bone conduction type speaker that does not generate air vibration, the microphone is attached to the main unit in a non-contact state where the sound collection part faces the communication path and does not transmit the vibration generated by the bone conduction type speaker. In the case of a telephone call below, it is difficult to hear the sound due to the influence of external noise, and a sufficient volume can be secured.

It is explanatory drawing which shows the external appearance of the noise suppression earphone microphone which concerns on one embodiment of this invention. It is a block diagram which shows the structure of the telephone call system using the noise suppression earphone microphone of FIG. 1 schematically shows an internal structure of the noise suppression earphone microphone of FIG. 1, (a) is a cross-sectional explanatory view of a first example, (b) is a cross-sectional explanatory view of a second example, and (c) is a cross-sectional explanatory view of a third example. FIG.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.
FIG. 1 is an explanatory diagram showing an appearance of a noise suppression earphone microphone according to an embodiment of the present invention, and FIG. 2 is a block diagram showing a configuration of a telephone call system using the noise suppression earphone microphone of FIG. .
As shown in FIG. 1, the noise suppression earphone microphone 10 is a small earphone (inner ear type headphone) that is equipped with a transmission (microphone) function as well as a reception (speaker) function, and can be attached to one ear. An ear tip 11 that is inserted into and attached to the ear hole, that is, the ear canal, and a main body portion 12 that is integrally formed with the ear tip 11 and that is exposed to the auricle side outside the ear canal when the ear tip 11 is inserted. ing.

The noise suppression earphone microphone 10 is connected to an ear of a worker in a high noise environment with a noise level of 90 dB or more, for example, via a call device installed in a place away from the workplace, for example, a management facility. A call system that can make calls is configured.
As shown in FIG. 2, the call system 13 is connected to the noise suppression earphone microphone 10, the transmission control unit 14 connected to the noise suppression earphone microphone 10 with a connection cord, the acoustic control unit 15, and the acoustic control unit 15 with a connection cord. The communication device 16 is provided, and the transmission control unit 14 and the acoustic control unit 15 are wirelessly connected via a wireless antenna 14 a provided in the transmission control unit 14 and a wireless antenna 15 a provided in the acoustic control unit 15. Communication takes place.

The signal transmission between the transmission control unit 14 and the acoustic control unit 15 is performed by wired communication or wireless communication. However, when the communication distance between the work place and the management facility where the communication device is installed is short, a short-range wireless communication standard is used. Bluetooth or analog weak wireless can be used.
The noise suppression earphone microphone 10 includes a microphone 17 composed of a condenser microphone or a silicon microphone, and a bone conduction speaker 18 using a bone conduction element, and the transmission control unit 14 includes a wireless transmission / reception unit 19. The acoustic control unit 15 includes a wireless transmission / reception unit 20, an echo cancellation unit 21, and a noise cancellation unit 22.

The wireless transmission / reception unit 19 outputs an output signal based on audio information output from the noise suppression earphone microphone 10 as a radio signal from the radio antenna 14a, and also outputs audio information based on the radio signal input from the radio antenna 14a to the noise suppression earphone microphone. 10 is output.
The radio transmission / reception unit 20 outputs audio information based on the radio signal input from the radio antenna 15a to the call device 16, and outputs an output signal based on the audio information output from the call device 16 as a radio signal from the radio antenna 15a. To do.
The echo cancellation unit 21 removes an echo component from the signal input via the radio transmission / reception unit 20, and the noise cancellation unit 22 removes a noise component from the signal input via the echo cancellation unit 21.

For example, a portable voice wireless device such as a mobile phone can be used as the call device 16 constituting the call system 13. Moreover, in the telephone call system 13, when the influence of external noise can be sufficiently eliminated by the ear chip 11, the noise cancellation unit 22 may not be provided.
FIG. 3 schematically shows the internal structure of the noise suppression earphone microphone of FIG. 1, (a) is an explanatory diagram of the first example, (b) is an explanatory diagram of the second example, and (c) is an explanatory diagram of the third example. It is explanatory drawing.
As shown in FIG. 3A, the ear tip 11 of the noise suppression earphone microphone 10 according to the first example is formed in a cylindrical shape having a communication path 11a communicating with the ear canal when the ear canal is inserted. The connecting portion 23 is provided so as to protrude from one end side and is coupled to one end side of the eartip 11.

In the vicinity of the end surface of the main body portion 12 opposite to the connecting portion 23, a bone conduction speaker 18 that is embedded in the main body portion 12 and does not generate air vibration is mounted. Since the vibration generated by the bone conduction speaker 18 is transmitted to the skull and can be heard, the noise suppressing earphone microphone 10 functions as an earphone.
The connecting portion 23 has an outer diameter that is slightly larger than the inner diameter of the communication path 11a, and has an outward flange 23a on the end surface thereof. When the connection portion 23 is coupled to the eartip 11, the connecting portion 23 is connected to the communication path 11a. By pushing and fitting the flange 23a into the annular groove 11b along the inner peripheral surface of the communication path 11a, the flange 23a is brought into close contact with the communication path 11a and integrated with the eartip 11.

Moreover, the connection part 23 has the recessed part 24 opened to the end surface, the opening shape is circular, for example, and the depth is a little shorter than the length of the connection part 12a. 11a, that is, a pneumatic (air propagation) microphone 17 is arranged facing the eardrum.
The microphone 17 can pick up air vibrations generated in the ear canal during speech, and can seal the ear canal where air vibrations are generated by the ear tip 11 to block external noise. Calls can be made at.

The microphone 17 has a compression coil spring 25 interposed between the recess 24 and the bottom surface (recess bottom surface) 24 a of the recess 24, and is bonded to the inner peripheral surface (recess inner peripheral surface) 24 b of the recess 24 by the elastic adhesive 26. Have been placed. The compression coil spring 25 is compressed and deformed by an urging force, and the elastic adhesive 26 retains elasticity even after curing, which exerts an adhesive force that adheres and fixes the microphone 17 to the inner peripheral surface 24b.
As a result, the microphone 17 disposed in the recess 24 is interposed between the compression coil spring 25 and the elastic adhesive 26 in the recess 24 opened in the main body 12 in which the bone conduction speaker 18 is embedded, that is, the bottom surface. It is held in a state of being separated from 24a and the inner peripheral surface 24b.

  That is, in the noise suppressing earphone microphone 10 formed by incorporating the pneumatic microphone 17 and the bone conduction speaker 18 in the same housing, the microphone 17 does not transmit the vibration generated by the bone conduction speaker 18. Is attached to the main body 12. For this reason, since the vibration generated by the bone conduction speaker 18 is not transmitted, it is difficult to form an acoustic feedback system using reverberation echoes, and howling can be suppressed. As a result, microphone output or speaker output is increased. Thus, the volume is reduced and it is not difficult to make a call under high noise. In addition, since howling measures are not required, clear voice transmission using a broadband (high sensitivity) microphone is possible, and the reproducibility of voice when a broadband (high sensitivity) microphone cannot be used is limited. There is no such thing as a muffled sound.

  As shown in FIG. 3B, the noise suppression earphone microphone 30 according to the second example uses a spike member 31 instead of the compression coil spring 25 and the elastic adhesive 26. Is held in a state of being separated from the bottom surface 24a and the inner peripheral surface 24b. Other configurations and effects are the same as those of the noise suppression earphone microphone 10 according to the first example.

The spike member 31 is formed in a polygonal pyramid shape that makes point contact at one location on the bottom surface 24a of the recess 24 and at least three locations on the inner peripheral surface 24b, and the microphone 17 is placed on the bottom surface. Arranged in the recess 24. That is, the microphone 17 is held in the concave portion 24 by the spike member 31 that makes point contact with the bottom surface 24a and the inner peripheral surface 24b, and is not contacted with the main body 12 in a non-contact state that does not transmit the vibration generated by the bone conduction speaker 18. Will be installed.
In addition, although the contact location with the internal peripheral surface 24b of the spike member 31 may be four or more locations, it is preferable that the number is as small as possible.

  As shown in FIG. 3C, the noise suppressing earphone microphone 35 according to the third example uses an impact absorbing member 36 instead of the compression coil spring 25 and the elastic adhesive 26, and the impact absorbing member 36 The microphone 17 disposed in the recess 24 is held in a state of being separated from the bottom surface 24a and the inner peripheral surface 24b. Other configurations and effects are the same as those of the noise suppression earphone microphone 10 according to the first example.

  The shock absorbing member 36 is formed of, for example, a shock absorbing gel member having a shock absorbing function such as silicon rubber, and the microphone 17 is separated from the bottom surface 24a and the inner peripheral surface 24b by the shock absorbing member 36 filled in the recess 24. It is arranged in the recess 24 in a state of being spaced apart and embedded except for the sound collecting portion. That is, the microphone 17 is embedded and held in the shock absorbing member 36 filled in the recess 24 and is attached to the main body 12 in a non-contact state that does not transmit the vibration generated by the bone conduction speaker 18. .

  As described above, the call system 13 using the noise suppression earphone microphones 10, 30, and 35 according to the present invention has a noise level of 90 dB or more, for example, a worker in a work place in a high noise environment with a noise level of 90 dB or more. In a high noise environment, the noise suppression earphone microphones 10, 30, and 35 can be made less susceptible to external noise when talking on the ear, so that the noise suppression earphone microphones 10, 30, and 35 can be used. It is difficult to hear the voice of the telephone call, and a sufficient volume can be secured during the telephone call.

DESCRIPTION OF SYMBOLS 10, 30, 35 Noise suppression earphone microphone 11 Ear tip 11a Communication path 11b Annular groove 12 Main part 13 Communication system 14 Transmission control unit 14a, 15a Radio antenna 15 Acoustic control unit 16 Communication device 17 Microphone 18 Bone conduction speaker 19, 20 Radio transmitting / receiving unit 21 Echo canceling unit 22 Noise canceling unit 23 Connecting unit 23a Flange 24 Recessed portion 24a Bottom surface 24b Inner circumferential surface 25 Compression coil spring 26 Resilient adhesive 31 Spike member 36 Shock absorbing member

Claims (4)

A body part that is integrally formed with an ear tip that has a communication path that communicates with the ear canal and is inserted into the ear canal, and is exposed to the outside of the ear canal when the ear tip is inserted;
A bone conduction type speaker that is mounted on the main body and does not generate air vibration;
A noise-suppressing earphone microphone having a sound collection portion facing the communication path and a microphone attached to the main body portion in a non-contact state that does not transmit vibration generated by the bone conduction speaker. The microphone is
A compression coil spring is interposed between the concave portion opened in the communication path and the bottom surface of the concave portion, and the microphone is disposed between the inner peripheral surface of the concave portion and an elastic adhesive that adheres the microphone to the inner peripheral surface of the concave portion. The noise suppression earphone microphone according to claim 1. The microphone is
The noise suppression earphone / microphone according to claim 1, wherein the recess opening in the communication path is supported by a spike member that makes point contact with the bottom surface of the recess and the inner peripheral surface of the recess. The microphone is
2. The shock absorbing member filled in the concave portion opened in the communication path is disposed in the concave portion while being separated from the concave bottom surface and the inner peripheral surface of the concave portion and being embedded except for the sound collecting portion. Noise suppression earphone microphone.

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