JP2013143612A - Measurement mounting member of insert type headphone - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a measurement mounting member of an insert type headphone capable of obtaining the characteristics of the headphone close to the characteristics in use including the influence of the own mechanical vibration that has not been recognized in conventional measurement by making the mounting member of the headphone soft, and coping with various sizes of ear chips by tapering the mounting part of the headphone.SOLUTION: A measurement mounting member of an insert type headphone acoustically connects an insert type headphone 2 to a microphone 3 in order to measure the characteristics of the insert type headphone 2. The measurement mounting member 1 made of elastomer includes: an acoustic tube part 1a that fits the outer diameter of an ear chip 2a of the insert type headphone 2 and is tapered to reduce in diameter toward a depth part; and an opening part 1b that communicates with the acoustic tube part 1a and to which the microphone 3 is mounted.

Description

  The present invention relates to an insert-type headphone measurement mounting member that performs acoustic coupling between a headphone and a microphone in order to measure the characteristics of the insert-type headphone that is used by inserting a sound emitting part into the ear canal.

  Conventionally, measuring apparatuses for measuring the characteristics of headphones are described in Patent Documents 1 and 2, for example. Patent Document 1 is a measuring device that measures the earphone characteristics when a hearing aid used by a hearing-impaired person or the like is calibrated, and Patent Document 2 listens with the human ear in consideration of acoustic leaks that occur when worn on the human ear. This is a measuring device that can measure a characteristic that matches the characteristic.

  When using headphones, an acoustic coupling is generated between the sounding body and the ears. Therefore, as described in Patent Documents 1 and 2, the same applies to measuring the characteristics of headphones. It is necessary to perform the measurement using a measurement mounting member having an acoustic coupling, that is, a so-called coupler. Since there are various forms of headphones, there are various types of couplers depending on the form of headphones.

  In the measurement of insert-type headphones to be inserted into the ear canal, an ear simulator generally found in “IEC60318-4 Annex A”, which is a standard that mimics the acoustic impedance of the ear, This is done by attaching it to a coupler that combines an external ear simulator such as Type 4157 and DB2012.

JP 59-165598 A JP 63-226220 A

  However, the coupler of the outer ear simulator is made of metal and has a larger mechanical impedance in the measurement band than the real ear. Insert-type headphones use rubber or sponge-like eartips to seal the ear canal when worn, but these are not sufficiently low in mechanical impedance compared to the ear canal, so whether the wearing target is a real ear or an ear simulator. The vibration state will change.

  Furthermore, the influence of housing vibration cannot be ignored when measuring as an electroacoustic transducer. In particular, the influence is large in the case where it is necessary to consider propagation from the outside or outside, for example, noise canceling headphones.

  Other examples include measurement using a flexible artificial auricle, such as the standard “IEC 60268-7 Annex A”, but the artificial auricle is not suitable for measuring headphones. Moreover, since the shape of the ear canal is a straight tube, there is a problem that attachment becomes unnatural or difficult.

  As described above, there is an influence of mechanical impedance in the measurement of the characteristics of headphones, and the influence is particularly great in an insert type in which a soft material such as rubber or sponge is directly fixed to the ear canal. Conventionally, metal parts are used because the influence of mechanical impedance is not taken into consideration. Furthermore, although some examples using artificial auricles are also seen, since the shape of the ear canal is a straight tube, the compatibility with headphones is not good.

  The present invention has been proposed in view of the above, and the object of the present invention is to make the mounting member of the headphone flexible so that the influence of mechanical vibration of the headphone itself, which has not been understood by conventional measurement, can be reduced. It is an object of the present invention to provide an insert-type headphone measurement mounting member that can obtain characteristics close to those in use and that can be used for various types of eartips by tapering the headphone mounting portion.

  In order to solve the above-mentioned problem, an insert type headphone measuring mounting member according to a first aspect of the present invention provides an acoustic coupling between the insert type headphone 2 and the microphone 3 in order to measure the characteristics of the insert type headphone 2. A measuring mounting member 1 for performing an acoustic measurement, wherein the measuring mounting member 1 made of elastomer is adapted to the outer diameter of the ear tip 2a of the insert type headphone 2 and has a taper with a smaller inner diameter as it goes deeper. A tube portion 1a is provided, and an opening portion 1b is provided which communicates with the acoustic tube portion 1a and attaches the microphone 3.

  According to a second aspect of the present invention, there is provided a measurement mounting member for an insert type headphone according to the first aspect, wherein the opening width of the mounting portion of the insert type headphone 2 in the acoustic tube portion 1a is 7 mm or more at the narrowest portion. Is 10 mm or more, and the diameter of the inner portion of the acoustic tube portion 1a is 10 mm or less, preferably 8 mm or less.

  Furthermore, the invention according to claim 3 is the insert-type headphone measurement mounting member according to claim 1 or 2, wherein the elastomer is close to the elastic modulus of human skin in an audible band with a sound frequency of 20 to 20 KHz. It is characterized by being in the range of 10 K to 10 MPa, preferably in the range of 50 K to 1 MPa.

  Furthermore, the invention according to claim 4 is the mounting member for measuring an insert-type headphone according to any one of claims 1 to 3, wherein the measuring mounting member 1 includes two or more different elastomers or elastomers. It is characterized by being combined with a hard material.

  The invention according to claim 5 is the mounting member for measuring an insert-type headphone according to any one of claims 1 to 4, wherein the acoustic tube portion 1a does not have at least one of axial symmetry and mirror image symmetry. It is characterized by shape

  According to the first aspect of the present invention, when the measurement mounting member is made of elastomer and the headphone mounting portion is made flexible, the use of the device including the influence of the mechanical vibration of the headphone itself, which is not known in the conventional measurement, is included. Close characteristics can be obtained. Moreover, it can respond to eartips of various sizes by tapering the acoustic tube portion.

  According to the second aspect of the present invention, the opening width of the insert-type headphone mounting portion in the acoustic tube portion is 7 mm or more, preferably 10 mm or more at the narrowest portion, and the inner diameter of the acoustic tube portion is 10 mm. In the following, it is possible to measure in a state close to the real ear by preferably 8 mm or less, and it is possible to cope with eartips of various sizes.

  Furthermore, in this invention of Claim 3, it can measure in the state close | similar to the elasticity modulus of a human skin.

  Furthermore, in the present invention described in claim 4, the measurement can be performed in consideration of the influence of human bones and cartilage.

  In the present invention described in claim 5, the measurement can be performed in consideration of the influence of the complex shape of the actual head.

It is sectional drawing which shows the state which couple | bonded the headphones and the microphone acoustically using the mounting member for a measurement of the insert type headphones which concern on the Example of this invention. It is a characteristic view which compares and shows the frequency characteristic at the time of using the mounting member for a measurement of the insert type headphones which concern on the Example of this invention, and the conventional coupler. FIG. 7 is a cross-sectional view showing a first modification of the measurement mounting member of the insert type headphone shown in FIG. 1. FIG. 10 is a cross-sectional view showing a second modification of the measurement mounting member of the insert type headphone shown in FIG. 1.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a cross-sectional view showing a state in which a headphone and a microphone are acoustically coupled using a measurement mounting member (coupler) of an insert type headphone according to an embodiment of the present invention. In FIG. 1, reference numeral 1 denotes an elastomeric measurement mounting member. The measurement mounting member 1 conforms to the outer diameter of the ear tip 2 a of the insert type headphone 2 on one end side, and the inner diameter gradually increases toward the back. The acoustic tube portion 1a has a taper that decreases. On the other end side of the mounting member for measurement 1, there is an opening 1b that communicates with the acoustic tube portion 1a and attaches the microphone 3. The upper surface of the sound collecting portion 3a of the microphone 3 is acoustically connected to the opening 1b. Measurement is performed by mounting the tube portion 1a so as to be positioned on the bottom surface of the tube portion 1a.

  The inner diameter of the opening of the acoustic tube portion 1a in the measurement mounting member 1 is 7 mm or more, preferably 10 mm or more at the narrowest portion, and the inner diameter of the inner portion of the acoustic tube portion 1a is 10 mm or less, preferably 8 mm or less. It is. Moreover, the elastomer of the mounting member for measurement 1 is close to the elastic modulus of human skin in an audible band with a sound frequency of 20 to 20 KHz, and is in the range of 10 K to 10 MPa, preferably in the range of 50 K to 1 MPa.

  FIG. 2 shows a comparison of frequency characteristics when using a measurement mounting member of an insert type headphone according to an embodiment of the present invention and a conventional coupler. In FIG. 2, a solid line indicates a conventional measurement result, and a broken line indicates a measurement result using the measurement mounting member according to the embodiment of the present invention. Although the measurement result is almost the same at a frequency of 1000 Hz or higher, it can be seen that when the frequency is 1000 Hz or lower, particularly 200 Hz or lower, the sound pressure level is lowered by the influence of mechanical vibration when a conventional coupler is used. On the other hand, in the measurement mounting member 1 of the present invention, the fluctuation of the sound pressure level of 1000 Hz or less is small, and at 200 Hz or less, the sound pressure level is sufficiently higher than the conventional one.

  Thus, by making the mounting member of the headphone 2 flexible, it is possible to obtain characteristics close to those in use including the influence of mechanical vibration of the headphone 2 itself, which was not known in the conventional measurement. In addition, since the acoustic tube portion 1a is tapered so that the inner diameter becomes narrower, various sizes of ear tips 2a can be attached, and versatility is high.

  Therefore, according to the present invention, there is provided a measurement mounting member for an insert type headphone that can obtain characteristics close to those in use including the influence of mechanical vibration of the headphone itself and can be used for ear chips of various sizes. it can.

  Although the present invention has been described with reference to the embodiments, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the scope of the invention at the stage of implementation. For example, in the above-described embodiment, the case where the measurement mounting member 1 is formed of an elastomer made of a single material close to the elastic modulus of human skin has been described as an example. However, as shown in FIG. Elastomers or elastomers and hard materials may be combined.

  FIG. 3 shows 10K to 10 MPa which is close to the elastic modulus of human skin in the audible band having a frequency of 20 to 20 KHz in the inner part 1-1 of the mounting member 1 for measurement in consideration of the influence of the presence of bone and cartilage of the real ear. Of 1 MPa or more (preferably 10 MPa or more) close to the elastic modulus of human bone or cartilage in the audible band of 20 to 20 KHz in the outer portion 1-2 using an elastomer within a range of (preferably within a range of 50 K to 1 MPa). It is a combination of elastomers or hard materials such as plastics and metals.

  According to such a configuration, characteristics closer to those at the time of use can be obtained. In addition, considering the complex shape of the real head, by making it a shape that does not have at least one of axial symmetry and mirror image symmetry close to the real ear, for example, by making the acoustic tube part bent in a crank shape, A characteristic close to that in use can be obtained.

  FIG. 4 shows a configuration in which a microphone 3 of various sizes can be mounted by interposing a spacer 4 between the measurement mounting member 1 and the microphone 3. That is, by preparing a plurality of types of spacers corresponding to the outer diameter of the microphone 3 in advance, the microphones 3 of different sizes can be mounted. The spacer 4 can be made of elastomer, plastic, metal or the like.

  Accordingly, not only the headphone 2 but also the microphone 3 can be adapted to various sizes, and the measurement mounting member 1 can be generalized.

1 Measurement mounting member (coupler)
1-1 Inner portion of measurement mounting member 1-2 Outer portion 1a of measurement mounting member Acoustic tube portion 1b Opening portion 2 Insert-type headphones (headphones)
2a Ear chip 3 Microphone 3a Sound collecting part 4 Spacer

Claims (5)

A measurement mounting member (1) for acoustically coupling the insert type headphones (2) and the microphone (3) in order to measure the characteristics of the insert type headphones (2),
An acoustic tube portion (1a) having a taper that fits to the outer diameter of the ear tip (2a) of the insert-type headphone (2) and decreases in the inner diameter toward the mounting member (1) for measurement made of elastomer. And an opening (1b) for connecting the microphone (3) to the acoustic tube (1a), and an insert-type headphone measurement mounting member.   The opening width of the insertion part of the insert type headphones (2) in the acoustic tube part (1a) is 7 mm or more, preferably 10 mm or more in the narrowest part, and the diameter of the back part of the acoustic tube part (1a) is 10 mm or less. The mounting member for measuring an insert-type headphone according to claim 1, wherein the mounting member is preferably 8 mm or less.   The elastomer has a sound frequency close to the elastic modulus of human skin in an audible band of 20 to 20 KHz, and is in a range of 10 K to 10 MPa, preferably in a range of 50 K to 1 MPa. 3. A measurement mounting member for the insert-type headphones according to 2.   The measurement mounting member (1) according to any one of claims 1 to 3, wherein the measurement mounting member (1) comprises two or more different elastomers or a combination of an elastomer and a hard material. Element. The mounting member for measuring an insert type headphone according to any one of claims 1 to 4, wherein the acoustic tube portion (1a) has a shape that does not have at least one of axial symmetry and mirror image symmetry. .

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