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DESCRIPTION JP2015023536

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DESCRIPTION JP2015023536
An object of the present invention is to provide a measurement system capable of measuring the
characteristics of an acoustic device for bringing a vibrating body into contact with the auricle of
a human body to transmit sound to a user. A measuring system 10 for evaluating an acoustic
device 1 in which a microphone unit 62 collects sound and a vibrating body 10a pressed against
a user's ear transmits the sound collected by the microphone unit 62 to the user. The speaker
units 91 and 92, the ear-shaped unit 50 imitating the human ear, the vibration sound detection
unit 55 disposed on the ear-shaped unit 50, the speaker units 91 and 92, the ear-shaped unit 50,
and the vibration And an anechoic space unit 80 accommodating the sound detection unit 55
therein. [Selected figure] Figure 4
Measurement system
[0001]
The present invention relates to a measurement system that measures an acoustic device such as
a hearing aid.
[0002]
Patent Document 1 describes, as an electronic device such as a mobile phone, one that transmits
air conduction sound and bone conduction sound to a user (user).
Further, Patent Document 1 describes that the air conduction sound is a sound transmitted to the
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user's auditory nerve by the vibration of the air caused by the vibration of the object being
transmitted to the tympanic membrane through the ear canal and vibrating the tympanic
membrane. It is done. Further, Patent Document 1 describes that the bone conduction sound is a
sound transmitted to the user's auditory nerve through a part of the user's body (for example, the
cartilage of the outer ear) in contact with the vibrating object. There is.
[0003]
In the telephone set described in Patent Document 1, it is described that a short plate-shaped
vibrator made of a piezoelectric bimorph and a flexible material is attached to the outer surface
of a housing through an elastic member. Further, according to Patent Document 1, when a
voltage is applied to the piezoelectric bimorph of the vibrator, the vibrator vibrates by the
expansion and contraction in the longitudinal direction of the piezoelectric material, and when
the user brings the vibrator into contact with the auricle, It is described that the air conduction
sound and the bone conduction sound are transmitted to the user.
[0004]
JP 2005-348193 A
[0005]
By the way, unlike the telephone set described in the above-mentioned patent document 1, the
inventor conducted an air conduction sound generated by vibrating a vibration transmitting
member disposed in an acoustic device by a vibrator and a vibration transmitting member
vibrating. We have developed acoustic devices such as hearing aids that transmit sound using
vibrational sound (bone conduction sound) that is a sound component due to vibrational
transmission that is transmitted when it is brought into contact with the auricle.
[0006]
However, no measurement method has been established at all for the above-described acoustic
device in which the vibrator is brought into contact with the auricle of the human body to
transmit the sound to the user.
Generally, the characteristics of an acoustic device such as a bone conduction hearing aid are
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indicated by the level of force generated in a bone conduction oscillator (oscillator) pressed to a
mechanical coupler (artificial mastoid) when a constant input sound pressure is applied. .
Therefore, it was not possible to measure the vibration component transmitted through the air
conduction radiation component in the ear canal of the ear and the cartilage of the ear due to the
vibration. Similarly, there has been no system capable of measuring the measurement items
defined in the standard such as a conventional hearing aid.
[0007]
Therefore, an object of the present invention made in view of the above problems is to provide a
measurement system capable of measuring the characteristics of an acoustic device for bringing
a vibrator into contact with the auricle of a human body to transmit sound to a user. .
[0008]
In order to solve the above problems, in the measurement system according to the present
invention, an acoustic device in which a microphone unit collects sound, and a vibrator pressed
against the user's ear transmits the sound collected by the microphone unit to the user It is a
measurement system for evaluating, and it is a speaker part, An ear type part which imitated a
human ear, Vibration sound detection part arranged in the ear type part, Said speaker part, said
ear type part, and the above And an anechoic space unit accommodating the vibration sound
detection unit therein.
[0009]
According to the measurement system of the present invention, it is possible to measure the
characteristics of the acoustic device which brings the vibrator into contact with the pinna of the
human body and transmits the sound to the user.
[0010]
It is a figure showing a schematic structure of a measurement system concerning a 1st
embodiment of the present invention.
It is the schematic of the audio equipment which concerns on 1st Embodiment of this invention.
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FIG. 2 is a partial detail view of the ear mold of FIG. 1;
It is a figure which shows the detail of a structure in the anechoic space part 80 of a
measurement system. It is a functional block diagram which shows the structure of the principal
part of the measurement part of FIG. It is a figure for demonstrating the phase relationship of the
output of the vibration detection element of FIG. 5, and the output of a microphone. It is a figure
which shows an example of an application screen. It is a figure which shows an example of a
measurement result screen. It is a figure which shows another example of a measurement result
screen. It is a figure which shows schematic structure of the measurement system which
concerns on 2nd Embodiment of this invention. 11 is a partial detail view of the measurement
system of FIG. It is a figure which shows schematic structure of the measurement system which
concerns on 3rd Embodiment of this invention.
[0011]
Hereinafter, embodiments of the present invention will be described with reference to the
drawings.
[0012]
First Embodiment FIG. 1 is a view showing a schematic configuration of a measurement system
10 according to a first embodiment of the present invention.
The measurement system 10 according to the present embodiment includes an audio equipment
mounting unit 20, a measurement unit 200, an anechoic space unit 80, and speaker units 91 and
92. In FIG. 1, only the speaker unit 91 is illustrated among the speaker units 91 and 92. The
acoustic device mounting unit 20 includes an ear-shaped unit 50 supported by the base 30 and a
holding unit 70 for holding the acoustic device 1 to be measured. The acoustic device 1 includes
a vibrating body, and the vibrating body is brought into contact with the pinna of a human body
to transmit a sound to the user. For example, the acoustic device 1 is a hearing aid or a mobile
phone such as a smartphone having a rectangular panel on the surface of a rectangular casing
larger than human ears, and the panel vibrates as a vibrator. The anechoic space portion 80 is a
space portion without reflected sound which is constituted by an anechoic box or the like. The
speaker unit 91, the speaker unit 92, and the audio equipment mounting unit 20 are
accommodated in the anechoic space unit 80.
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[0013]
FIG. 2 is a schematic view showing the acoustic device 1 and the transmission of sound in the
present invention. In FIG. 2, an example in which the acoustic device 1 is the hearing aid 1 is
illustrated. When the acoustic device 1 is the hearing aid 1, the acoustic device 1 includes the
microphone unit 20a in addition to the vibrating body 10a. The microphone unit 20a collects the
sound from the speaker units 91 and 92, and the vibrating body 10a amplifies the sound
collected by the microphone unit 20a and transmits the sound to the user by vibration. In FIG. 2,
only the speaker unit 91 is illustrated, and the speaker unit 92 is omitted.
[0014]
As shown in FIG. 2, the sound from the speaker parts 91 and 92 comes from the portion not
covered by the vibrating body 10a directly to the tympanic membrane through the ear canal
(path I). Also, air conduction sound due to the vibration of the vibrating body 10a comes to the
eardrum through the ear canal (path II). Further, at least the inner wall of the ear canal vibrates
due to the vibration of the vibrating body 10a, and the air conduction sound (the ear canal
emission sound) due to the vibration of the ear canal arrives at the eardrum (pathway III).
Furthermore, the vibration sound comes directly to the auditory nerve without passing through
the tympanic membrane by the vibration of the vibrating body 10a (path IV). A part of the air
conduction sound generated from the vibrating body 10a escapes to the outside (path V).
[0015]
Next, the configuration of the audio device mounting unit 20 to which the audio device 1 is
mounted will be described. The ear mold unit 50 imitates the human ear and includes an artificial
auricle 51 and an artificial external ear canal unit 52 coupled to the artificial auricle 51. In the
artificial external ear canal unit 52, an artificial external ear canal 53 is formed in the center. The
ear mold 50 is supported by the base 30 via a support member 54 at the periphery of the
artificial external ear canal unit 52.
[0016]
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The ear-shaped portion 50 is, for example, a material similar to the material of the average
artificial pinnax used for HATS (Head And Torso Simulator) of a human body model or KEMAR
(name of electronic manikin for acoustic research of Knowles). , It consists of a material
according to IEC60318-7. This material can be formed of, for example, a material having a
hardness of 35 to 55, such as rubber. The hardness of the rubber may be softer, for example,
softer than Shore hardness 35, and Shore hardness may be about 15 to 30. These may be
measured, for example, in accordance with the international rubber hardness (IRHD.M method)
in accordance with JIS K 6253, ISO 48 or the like. In addition, as a hardness measurement
system, a fully automatic type IRHD · M method micro size international rubber hardness meter
GS680 manufactured by Techlock Co., Ltd. is suitably used. The ear mold 50 may be roughly
prepared with two to three types of different hardness in consideration of variations in ear
hardness depending on age, and these may be replaced and used.
[0017]
The thickness of the artificial external ear canal unit 52, that is, the length of the artificial
external ear canal 53 corresponds to the length to the tympanic membrane (cochlea) of a person,
and is appropriately set, for example, in the range of 20 mm to 40 mm. In the present
embodiment, the length of the artificial external ear canal 53 is approximately 30 mm.
[0018]
The vibration sound detection unit 55 is disposed in the ear mold unit 50 so as to be positioned
at the opening peripheral portion of the artificial external ear canal 53 on the end surface of the
artificial external ear canal unit 52 opposite to the artificial auricle 51 side. The vibration sound
detection unit 55 detects the amount of vibration transmitted through the artificial external ear
canal unit 52 when the vibrator of the acoustic device 1 is applied to the ear mold unit 50. In
other words, when the vibration body of the acoustic device 1 is pressed against the human ear,
the vibration sound detection unit 55 causes the vibration of the vibration body of the acoustic
device 1 to directly shake the inner ear, and causes the vibration sound component to be heard
without passing through the eardrum. The corresponding amount of vibration is detected. Here,
the vibration sound is a sound transmitted to the user's auditory nerve through a part of the
user's body (for example, the cartilage of the outer ear) in contact with the vibrating object. The
vibration sound detection unit 55 may have, for example, flat output characteristics in a
measurement frequency range (for example, 0.1 kHz to 30 kHz) of the audio device 1, and a
vibration that can accurately measure even a light weight and a minute vibration. A detection
element 56 is provided. As such a vibration detection element 56, for example, a vibration pickup
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such as a piezoelectric acceleration pickup, for example, a vibration pickup PV-08A
manufactured by Rion Co., can be used.
[0019]
FIG. 3A is a plan view of the ear mold 50 as viewed from the base 30 side. Although the case
where the ring-shaped vibration detection element 56 is arrange | positioned so that the opening
peripheral part of the artificial external ear canal 53 may be surrounded in FIG. 3 (a) is
illustrated, the vibration detection element 56 is not only one but plural. It may be When a
plurality of vibration detection elements 56 are arranged, they may be arranged at appropriate
intervals in the periphery of the artificial external ear canal 53, or two arc-shaped vibration
detections to surround the opening peripheral portion of the artificial external ear canal 53 The
element 56 may be disposed. In FIG. 3A, the artificial external ear canal unit 52 has a rectangular
shape, but the artificial external ear canal unit 52 can have an arbitrary shape.
[0020]
Furthermore, an air conduction sound detection unit 60 is disposed in the ear mold unit 50. The
air conduction sound detection unit 60 measures the sound pressure of the sound transmitted
through the artificial external ear canal 53. That is, when the vibration body of the acoustic
device 1 is pressed against the ear of the human body, the air conduction sound detection unit
60 vibrates the air by the vibration of the vibration body of the acoustic device 1 and listens
directly via the eardrum. The sound pressure corresponding to the sound and the sound pressure
corresponding to the air conduction sound by which the sound generated inside the ear itself is
vibrated by the vibration of the vibrating body of the acoustic device 1 by the vibration of the
vibrating body of the acoustic device 1 are measured. The air conduction sound is a sound
transmitted to the user's auditory nerve when the vibration of air caused by the vibration of the
object is transmitted to the tympanic membrane through the ear canal and the tympanic
membrane vibrates. Furthermore, when there is a sound source different from the acoustic
device 1, the air conduction sound detection unit 60 also measures the sound pressure of the
direct sound from the sound source.
[0021]
The air conduction sound detection unit 60 is a ring-shaped vibration detection element 56 from
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the outer wall (peripheral wall of the hole) of the artificial external ear canal 53 as a crosssectional view taken along the line bb in FIG. The microphone unit 62 is held by the tube
member 61 extending through the opening of the microphone. The microphone unit 62 has, for
example, a flat output characteristic in the measurement frequency range of the audio device 1,
and is configured by a measurement capacitor microphone with a low self noise level. As such a
microphone unit 62, for example, a condenser microphone UC-53A manufactured by Rion
Corporation can be used. The microphone unit 62 may be disposed such that the sound pressure
detection surface substantially matches the end surface of the artificial external ear canal unit 52.
The microphone unit 62 may be supported by the artificial external ear canal unit 52 or the base
30, for example, and may be arranged in a floating state from the outer wall of the artificial
external ear canal 53.
[0022]
Next, the holding unit 70 will be described. The holding unit 70 includes a support unit 71 that
supports the audio device 1. The support portion 71 schematically shows only the vibrating body
10 a of the acoustic device 1 (in FIG. 1, the acoustic device 1. Is mounted on one end of the arm
72 so that it can be adjusted to rotate about an axis y1 parallel to the y-axis in a direction to
press the ear mold 50). The other end of the arm unit 72 is coupled to a movement adjustment
unit 73 provided on the base 30. The movement adjustment unit 73 moves the arm unit 72 in
the vertical direction x1 of the acoustic device 1 supported by the support unit 71 and the z-axis
orthogonal to the y-axis and the x-axis in a direction parallel to the x-axis orthogonal to the yaxis. In the direction parallel to the direction z, the movement adjustment can be performed in
the direction z1 in which the acoustic device 1 is pressed against the ear mold 50.
[0023]
Thereby, the acoustic device 1 supported by the support portion 71 rotates and adjusts the
support portion 71 centering on the axis y1, or moves and adjusts the arm portion 72 in the z1
direction, thereby the ear of the vibrating body The pressing force on the mold unit 50 is
adjusted. In the present embodiment, the pressing force is adjusted in the range of 0N to 10N. Of
course, in addition to the axis y1, the support portion 71 may be configured to be rotatable about
another axis.
[0024]
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In the case of 0 N, for example, it can be held apart from the ear mold 50 at intervals of 1 cm, so
that measurement can be performed at each separation distance as well as when it is in contact
with the ear mold 50 but not pressed. You may As a result, the degree of attenuation of the air
conduction sound due to the distance can also be measured by the microphone unit 62, and the
convenience as a measurement system is improved.
[0025]
Further, by moving and adjusting the arm portion 72 in the x1 direction, the contact posture of
the acoustic device 1 with respect to the ear mold portion 50 is, for example, a posture in which
the vibrator covers a part of the ear mold portion 50 as shown in FIG. Adjusted to The arm unit
72 can be adjusted to move in a direction parallel to the y-axis, or can be adjusted to rotate about
an axis parallel to the x-axis or z-axis. Thus, the audio device 1 may be configured to be
adjustable to various contact postures. Note that the vibrating body is not limited to one that
covers a wide ear such as a panel, and is an acoustic device having a projection or a corner that
transmits vibration only to a part of the ear mold 50, for example, a part of the tragus. Even in
the case of the present invention, the present invention can be measured.
[0026]
FIG. 4 is a diagram showing details of the configuration of the anechoic space portion 80 of the
measurement system 10 according to the first embodiment, and more specifically, the positional
relationship between the speaker portions 91 and 92 and the ear type portion 50, no The details
of the configuration of the sound space unit 80 are shown. FIGS. 4A and 4B respectively show
the z-axis direction and the y-axis direction. As shown in FIGS. 4 (a) and 4 (b), the anechoic space
portion 80 includes a plurality of wedge-shaped sound absorbing layers 81, and constitutes a
space having no reflected sound or having very little reflected sound. Moreover, the anechoic
space part 80 is provided with the hole 82 for a connection with the exterior. The connection
hole 82 is used for connection with the measurement unit 200. As shown in FIG. 4A, the speaker
unit 92 is provided on the side of the anechoic space 80 in the negative direction of the y-axis
(the front direction of the human face). That is, the speaker unit 92 is disposed at a position at an
angle of 0 ° when the front direction of the virtual human being provided with the ear-shaped
unit 50 is an angle of 0 ° with respect to the ear-shaped unit 50. That is, the speaker unit 92 is
used to emit sound from the front of the face. The speaker unit 92 is connected to a test sound
presentation unit 700 (described later) of the measurement unit 200, and emits a sound
presented by the test sound presentation unit 700.
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[0027]
Further, as shown in FIG. 4B, the speaker portion 91 is provided on the side surface of the
anechoic space portion 80 in the positive direction of the z axis (the front direction of the
artificial auricle 51). That is, the speaker unit 91 is disposed at a position at an angle of 90 °
with respect to the ear mold unit 50 when the front face of a virtual human being provided with
the ear mold unit 50 is at an angle of 0 °. That is, the speaker unit 91 is used to emit a sound
from the lateral direction (front direction of the ear) of the face. The speaker unit 91 is connected
to a test sound presentation unit 700 (described later) of the measurement unit 200, and emits a
sound presented by the test sound presentation unit 700.
[0028]
Preferably, as shown in FIGS. 4 (a) and 4 (b), the measurement system 10 includes a
hemispherical model 57 that simulates one half (one side surface portion) of the human head,
and the artificial auricle 51 is a hemispherical model. 57 is provided detachably. By providing the
hemispherical model 57, reflection of sound by the head of the human body can be reproduced
more faithfully. The hemispherical model 57 is configured to be detachable from any of the left
and right ear types. In FIG. 4, the artificial auricle 51 is an ear type that imitates the right ear.
However, the present invention is not limited to this.
[0029]
Next, the configuration of the measurement unit 200 in FIG. 1 will be described. FIG. 5 is a
functional block diagram showing the configuration of the main part of the measuring unit 200.
As shown in FIG. In the present embodiment, the amount of vibration and sound pressure
transmitted through the ear mold 50 by the vibration of the acoustic device 1 to be measured,
that is, the body sensation sound pressure in which the vibration sound and the air conduction
sound are combined is measured. A sensitivity adjustment unit 300, a signal processing unit 400,
a PC (personal computer) 500, a printer 600, and a test sound presentation unit 700 are
provided.
[0030]
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The outputs of the vibration detection element 56 and the microphone unit 62 are supplied to
the sensitivity adjustment unit 300. The sensitivity adjustment unit 300 includes a variable gain
amplification circuit 301 that adjusts the amplitude of the output of the vibration detection
element 56, and a variable gain amplification circuit 302 that adjusts the amplitude of the output
of the microphone unit 62. Then, the amplitude of the analog input signal corresponding to each
circuit is manually or automatically adjusted independently to the required amplitude. Thereby,
the error of the sensitivity of the vibration detection element 56 and the sensitivity of the
microphone unit 62 is corrected. The variable gain amplification circuits 301 and 302 are
configured to be able to adjust the amplitude of the input signal, for example, in a range of ± 50
dB.
[0031]
The output of the sensitivity adjustment unit 300 is input to the signal processing unit 400. The
signal processing unit 400 includes an A / D conversion unit 410, a frequency characteristic
adjustment unit 420, a phase adjustment unit 430, an output combining unit 440, a frequency
analysis unit 450, a storage unit 460, and a signal processing control unit 470. The A / D
conversion unit 410 converts an output of the variable gain amplification circuit 301 into a
digital signal, and an A / D conversion circuit (A / D) 411 converts the output of the variable gain
amplification circuit 301 into a digital signal. And a conversion circuit (A / D) 412. Then, an
analog input signal corresponding to each circuit is converted into a digital signal. The A / D
conversion circuits 411 and 412 can cope with, for example, 16 bits or more and 96 dB or more
in dynamic range conversion. The A / D conversion circuits 411 and 412 can be configured to be
able to change the dynamic range.
[0032]
The output of the A / D conversion unit 410 is supplied to the frequency characteristic
adjustment unit 420. The frequency characteristic adjustment unit 420 includes an equalizer
(EQ) 421 that adjusts the frequency characteristic of a detection signal from the vibration
detection element 56 that is an output of the A / D conversion circuit 411, and a microphone
unit 62 that is an output of the A / D conversion circuit 412. And an equalizer (EQ) 422 for
adjusting the frequency characteristic of the detection signal. Then, the frequency characteristics
of each input signal are manually or automatically adjusted independently to the frequency
characteristics close to the human hearing. The equalizers 421 and 422 are constituted by, for
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example, graphical equalizers of multiple bands, low pass filters, high pass filters, and the like.
The arrangement order of the equalizer (EQ) and the A / D conversion circuit may be reversed.
[0033]
The output of the frequency characteristic adjustment unit 420 is supplied to the phase
adjustment unit 430. The phase adjustment unit 430 includes a variable delay circuit 431 that
adjusts the phase of the detection signal from the vibration detection element 56 that is the
output of the equalizer 421. That is, since the speed of sound transmitted through the material of
the ear mold 50 and the speed of sound transmitted through the flesh and bones of the human
body are not exactly the same, the phase relationship between the output of the vibration
detection element 56 and the output of the microphone 62 is particularly high. It is assumed that
the deviation from the human ear becomes large.
[0034]
As described above, when the phase relationship between the output of the vibration detection
element 56 and the output of the microphone unit 62 largely deviates, the peak or dip of the
amplitude with a value different from the actual value when combining both outputs in the
output combining unit 440 described later. May appear, or the combined output may increase or
decrease. For example, when the transmission speed of the sound detected by the microphone
unit 62 is delayed by 0.2 ms with respect to the transmission speed of the vibration detected by
the vibration detection element 56, the combined output of the two by the 2 kHz sine wave
vibration is shown in FIG. It becomes as shown in (a). On the other hand, when there is no
difference between the transmission speeds of the two, the combined output is as shown in FIG. 6
(b), and the peak and dip of the amplitude appear at the timing which does not occur originally. 6
(a) and 6 (b), the thick line shows the vibration detection waveform at the vibration detection
element 56, the thin line shows the sound pressure detection waveform at the microphone
section 62, and the broken line shows the combined output waveform. .
[0035]
Therefore, in the present embodiment, the variable delay circuit 431 adjusts the phase of the
detection signal by the vibration detection element 56, which is the output of the equalizer 421,
in a predetermined range according to the measurement frequency range of the audio device 1
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to be measured. . For example, when the measurement frequency range of the audio device 1 is
100 Hz to 10 kHz, the variable delay circuit 431 uses the vibration detection element 56 in a
unit smaller than at least 0.1 ms (10 kHz equivalent) within a range of about ± 10 ms
(equivalent to ± 100 Hz). Adjust the phase of the detection signal. Note that, even in the case of
the human ear, a phase shift between the vibration sound and the air conduction sound occurs,
so that the phase adjustment by the variable delay circuit 431 is to match the phases of detection
signals of both the vibration detection element 56 and the microphone unit 62. It does not mean,
but means that the phases of both are matched to the actual hearing by the ear.
[0036]
The output of the phase adjustment unit 430 is supplied to the output combining unit 440. The
output combining unit 440 combines the detection signal by the vibration detection element 56
that has been phase-adjusted by the variable delay circuit 431 and the detection signal by the
microphone unit 62 that has passed the phase adjustment unit 430. By this, the vibration amount
and sound pressure transmitted by the vibration of the acoustic device 1 to be measured, that is,
the sound pressure of the synthesized sound (the perceived sound pressure) obtained by
synthesizing the vibration sound and the air conduction sound can be approximated to the
human body It becomes possible.
[0037]
The combined output of the output combining unit 440 is input to the frequency analysis unit
450. The frequency analysis unit 450 includes an FFT (Fast Fourier Transform) 451 that
frequency analyzes the combined output from the output combining unit 440. As a result, from
the FFT 451, power spectrum data corresponding to a synthesized sound (air + vib) in which the
vibration sound (vib) and the air conduction sound (air) are synthesized is obtained.
[0038]
Furthermore, in the present embodiment, frequency analysis unit 450 generates a signal before
combining by output combining unit 440, that is, a detection signal by vibration detection
element 56 that has passed phase adjustment unit 430 and a detection signal by microphone
unit 62. It comprises FFTs 452 and 453 that perform frequency analysis respectively. As a result,
power spectrum data corresponding to vibration sound (vib) is obtained from the FFT 452, and
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power spectrum data corresponding to air conduction sound (air) is obtained from the FFT 453.
[0039]
In the FFTs 451 to 453, analysis points of frequency components (power spectrum) are set
according to the measurement frequency range of the audio device 1. For example, when the
measurement frequency range of the acoustic device 1 is 100 Hz to 10 kHz, the frequency
component of each point obtained by equally dividing the interval in the logarithmic graph of the
measurement frequency range by 100 to 2000 is analyzed.
[0040]
The outputs of the FFTs 451 to 453 are stored in the storage unit 460. Storage unit 460 has a
capacity equal to or more than a double buffer capable of holding a plurality of analysis data
(power spectrum data) by FFTs 451 to 453 respectively. Then, the latest data can be transmitted
at all times at a data transmission request timing from the PC 500 described later.
[0041]
The signal processing control unit 470 is connected to the PC 500 via an interface connection
cable 510 such as a LAN, USB, RS-232C, SCSI, or PC card, for example. Then, based on a
command from the PC 500, it controls the operation of each unit of the signal processing unit
400. The signal processing unit 400 can be configured as software executed on any suitable
processor such as a CPU (central processing unit) or can be configured by a DSP (digital signal
processor).
[0042]
The PC 500 has an evaluation application that presents the acoustic characteristics of the
acoustic device 1 by the measurement system 10. The evaluation application is downloaded via,
for example, a CD-ROM or a network and stored in the storage unit 520. Also, the PC 500 causes
the control unit 530 to execute the evaluation application. Then, the PC 500 displays, for
example, an application screen based on the evaluation application on the display unit 540. Also,
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a command is transmitted to the signal processing unit 400 based on the information input via
the application screen. Also, the PC 500 receives command response and data from the signal
processing unit 400, performs predetermined processing based on the received data, and
displays the measurement result on the application screen. Also, the measurement results are
output to the printer 600 and printed as necessary.
[0043]
In FIG. 5, for example, the sensitivity adjustment unit 300 and the signal processing unit 400 are
mounted on the base 30 of the audio device mounting unit 20, and the PC 500 and the printer
600 are separately installed from the base 30 to perform signal processing. The unit 400 and the
PC 500 can be connected via the connection cable 510.
[0044]
The test sound presentation unit 700 uses a test signal generation unit (not shown) to generate a
single frequency sine wave signal (pure tone), a pure tone sweep signal, a multi-sine wave,
vibration sound (wobble tone), band noise (band noise), etc. Generate
Then, the test sound presentation unit 700 presents the test sound by the speaker unit 91 or the
speaker unit 92. Alternatively, the test sound presentation unit 700 can connect the test sound
not to the speaker unit 91 or the speaker unit 92 but to the external terminal of the audio device
1 and can input the test sound as an input signal to the audio device 1 There is.
[0045]
The test sound presentation unit 700 also adjusts the sound to be presented based on the head
related transfer function to present the sound. Here, the head-related transfer function
represents a change in sound generated by a part of the human body (auricle, head, shoulder,
etc.) as a transfer function. The head related transfer functions differ depending on the direction
of sound. Therefore, for example, the head transfer function is different between the sound from
the direction of 0 ° (sound from the speaker unit 92) and the sound from the direction of 90 °
(sound from the speaker unit 91). Therefore, test sound presentation unit 700 adjusts and
presents the sound presented to speaker unit 91 and speaker unit 92 by an equalizer (not
shown) based on the head-related transfer function, and the adjusted sound is transmitted to
speaker unit 91, The speaker unit 92 is made to output. The HRTFs corresponding to 0 ° and 90
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° are stored in advance in the storage unit 520 or the like.
[0046]
FIG. 7 is a view showing an example of an application screen displayed on the display unit 540.
As shown in FIG. The application screen shown in FIG. 7 includes a setting menu 541, a test
sound menu 542, a recording menu 543, an analysis menu 544, a reproduction menu 545, and a
hearing aid standard measurement menu 546. The setting menu 541 allows the user to calibrate
the entire measuring instrument including the sensor settings of the measurement system 10,
the speaker unit and the microphone, etc., read the setting information adjusted and stored in the
past, and the phase difference between the air conduction sound and the vibration sound. And
setting of synthesis, setting of equalization, and storage of the currently adjusted setting
information.
[0047]
Further, the user can select one of the speaker unit 91 (“speaker 1”), the speaker unit 92
(“speaker 2”), and the audio device 1 by the test sound menu 542 as the test sound output
destination. Also, the type of test sound can be set to either pure tone or pure tone sweep. The
user can also adjust the frequency, time length, amplitude, and sound pressure associated with
the test sound. When the type of test sound is set to pure tone sweep, setting of the start
frequency and the end frequency is possible. Furthermore, it is also possible to read an audio file
of WAVE format or the like as a test sound.
[0048]
The recording menu 543 allows the user to save (collect) the measurement result in a
predetermined storage destination, and can add a predetermined file name header and save the
result. The analysis menu 544 allows the user to read data recorded in the past and perform
various analyzes. Further, the user can reproduce the air conduction sound, the vibration sound,
or the synthesized sound of the sounds generated by the audio device 1 by the reproduction
menu 545. The hearing aid standard measurement menu 546 also allows the user to
automatically perform all measurements associated with the standard items of the hearing aid.
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[0049]
FIG. 8 is a diagram showing an example of the measurement result screen displayed on the
display unit 540. As shown in FIG. The measurement result screen shown in FIG. 8 is an example
of a standard measurement item of the hearing aid. FIG. 8 outputs a sound pressure of 90 dB
which is a predetermined sound pressure from the speaker unit 91, and synthesizes an output
sound from the acoustic device 1 from the detection value of the air conduction sound detection
unit 60 and the detection value by the vibration sound detection unit 55. Frequency
characteristics (power spectrum data) of the synthesized sound to be displayed. The
measurement result screen of FIG. 8 shows power spectrum data of each frequency and also
shows output sound pressure at 500 Hz and 1600 Hz as a representative value.
[0050]
As described above, according to the present invention, it is possible to measure the
characteristics of the acoustic device 1 in which the vibrator is brought into contact with the
auricle of a human body to transmit the sound to the user. .
[0051]
FIG. 9 is a view showing another example of the measurement result screen displayed on the
display unit 540. As shown in FIG.
The measurement result screen shown in FIG. 9 shows spectrum data representing the degree of
amplification (maximum acoustic gain) with respect to the input sound of the output sound
output from the audio device 1 for each frequency. In the measurement result screen of FIG. 9,
the maximum acoustic gains relating to the air conduction sound (air) detected by the air
conduction sound detection unit 60 and the vibration sound (vib) detected by the vibration sound
detection unit 55 are displayed. Further, on the measurement result screen of FIG. 9, the
maximum acoustic gain at 1600 Hz is displayed as a representative value. By separately
displaying the air conduction sound and the vibration sound as described above, the transmission
efficiency of the air conduction sound and the degree of the transmission efficiency of the
vibration sound can be evaluated. For example, the degree of performance related to the
vibration noise is more important for conductive hearing loss, but by separately presenting the
characteristics related to the air conduction sound and the vibration noise, the characteristics
related to the vibration noise of the acoustic device 1 Evaluation can be performed more
appropriately.
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[0052]
As described above, in the measurement result screen, the air conduction sound and the vibration
sound, or the synthesized sound thereof is displayed, but the present invention is not limited
thereto, and only one of the air conduction sound or the vibration sound is It may be displayed.
Such display switching is performed by performing only the necessary display by the function of
the evaluation software of the PC 500 and hiding unnecessary ones.
[0053]
In the present embodiment, the speaker portions 91 and 92 are disposed at the positions of 0 °
and 90 °. However, the present invention is not limited to this, and can be set to any other
angle. For example, the speaker parts 91 and 92 may be disposed at the positions of 180 ° and
270 °. That is, when the angle of the front of the virtual human being provided with the earshaped portion 50 is 0 °, the speaker portions 91 and 92 are positioned at any of 0 °, 90 °,
180 °, or 270 °. It may be arranged. In this case, the system stores a head related transfer
function corresponding to one of the angles of 0 °, 90 °, 180 °, and 270 ° in the storage unit
520 or the like. Then, the test sound presentation unit 700 adjusts and presents the sound
presented to the speaker unit 91 and the speaker unit 92 with an equalizer (not shown) based on
the head-related transfer function, and outputs the adjusted sound to the speaker unit 91, The
speaker unit 92 is made to output. By doing this, the directivity of the characteristics of the audio
device 1 can be evaluated.
[0054]
Second Embodiment The second embodiment of the present invention will be described below.
The second embodiment is different from the first embodiment in the configuration of the
measurement system 110. The other configuration is the same as that of the first embodiment.
The same components as those in the first embodiment are given the same reference numerals,
and the description thereof is omitted.
[0055]
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FIG. 10 is a view showing a schematic configuration of a measurement system 110 according to
a second embodiment of the present invention. The measurement system 110 according to the
present embodiment is different from the acoustic device mounting unit 20 according to the first
embodiment in the configuration of the acoustic device mounting unit 120, and the other
configurations are the same as those according to the first embodiment. Therefore, in FIG. 10, the
illustration of the measuring unit 200 shown in the first embodiment is omitted. The acoustic
device mounting unit 120 includes a human head model 130 and a pair of ear-shaped units 131
provided corresponding to the left and right, respectively. The head model 130 is made of ATS,
KEMAR, and the like. The ear mold portion 131 of the head model 130 is detachable from the
head model 130.
[0056]
The ear-shaped portion 131 imitates the ear of a human body, and as shown in a side view
removed from the head model 130 in FIG. 11A, an artificial ear similar to the ear-shaped portion
50 of the first embodiment And an artificial external ear canal unit 134 coupled to the artificial
auricle 132 and having an artificial external ear canal 133 formed therein. In the artificial
external ear canal unit 134, a vibration sound detection unit 135 including a vibration detection
element is disposed around the opening of the artificial external ear canal 133, similarly to the
ear-shaped unit 50 of the first embodiment. Further, in the mounting portion of the ear-shaped
portion 131 of the head model 130, as shown in the side view of FIG. 11 (b) with the ear-shaped
portion 131 removed, the air conduction sound detecting portion 136 provided with a
microphone in the center portion It is arranged. The air conduction sound detection unit 136 is
arranged to measure the sound pressure of the sound transmitted through the artificial external
ear canal 133 of the ear mold portion 131 when the ear mold portion 131 is attached to the
head model 130. The air conduction sound detection unit 136 may be disposed on the side of the
ear mold section 131 as in the case of the ear mold section 50 of the first embodiment. The
vibration detection element 56 constituting the vibration sound detection unit 135 and the
microphone unit 62 constituting the air-conduction sound detection unit 136 are connected to
the measurement unit 200 as in the first embodiment.
[0057]
According to the measurement system 110 according to the present embodiment, measurement
results similar to those of the measurement system 10 of the first embodiment can be obtained.
In particular, in the present embodiment, since the ear device 131 for detecting vibration is
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detachably mounted on the head model 130 of the human body to evaluate the acoustic device 1,
actual use in which the influence of the head is considered It becomes possible to make an
evaluation in line with the aspect.
[0058]
Third Embodiment The third embodiment of the present invention will be described below. The
third embodiment generally differs from the second embodiment in that the human head model
130 rotates.
[0059]
FIG. 12 is a diagram showing a schematic configuration of a measurement system 210 according
to a third embodiment of the present invention. The measurement system 210 according to the
present embodiment is different from the acoustic device mounting unit 120 according to the
second embodiment in that the head model 130 of the human body rotates, and the other
configurations are the same as those according to the second embodiment. is there.
[0060]
The measurement system 210 according to the present embodiment includes a rotating shaft
141 and a knob 142 for the rotating shaft 141. The rotation axis 141 is provided to penetrate
the center of the head model 130. The rotation axis 141 is fixed to the head model 130, and
when the rotation axis 141 rotates, the head model 130 also rotates around the rotation axis. The
rotating shaft 141 extends outside the anechoic space 80 and is configured to be rotatable from
the outside of the anechoic space 80. The rotation shaft 141 is preferably made of metal such as
SUS so as not to be easily deformed, but may be made of resin.
[0061]
The knob 142 is provided at an end of the rotary shaft 141 extending from the anechoic space
80. The knob 141 is provided with an angle indicator (0 ° to 360 °) similar to a protractor so
that the rotation angle from 0 ° can be viewed. When the knob 141 is rotated by the operation
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of the measurer, the rotation model 141 is rotated by the rotation of the rotation shaft 141. By
rotating the head model 130, the relative angle between the head model 130 and the speaker
units 91 and 92 can be arbitrarily changed. Therefore, according to the measurement system of
the third embodiment, the directivity of the characteristics of the acoustic device 1 can be
evaluated in more detail by emitting sound from the speaker parts 91 and 92 from an arbitrary
angle.
[0062]
In the present embodiment, an example in which the rotary shaft 141 penetrates the head model
130 is shown, but the present invention is not limited to this. The rotation axis 141 may not
penetrate through the head model 130, and in this case, it extends to any place inside the head
model 130.
[0063]
The rotating shaft 141 may be hollow. In this case, signal wires for the vibration sound detection
unit 135, the air conduction sound detection unit 136, and the like may be accommodated in the
hollow portion.
[0064]
In the present embodiment, the head model 130 is rotated. However, the present invention is not
limited to this. The speaker units 91 and 92 may be rotated with respect to the head model 130.
Also in this case, the relative angle between the speaker parts 91 and 92 and the head model
130 can be arbitrarily changed, and the directivity of the characteristics of the acoustic device 1
can be evaluated in more detail.
[0065]
Although the present invention has been described based on the drawings and examples, it
should be noted that those skilled in the art can easily make various changes and modifications
based on the present disclosure. Therefore, it should be noted that these variations and
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modifications are included in the scope of the present invention. For example, each means, each
member, functions included in each step, etc. can be rearranged so as not to be logically
contradictory, and a plurality of means, members, etc. may be combined or divided into one. It is
possible.
[0066]
DESCRIPTION OF SYMBOLS 1 audio equipment (hearing aid) 10 measurement system 10a
vibrating body 20a microphone 20 audio equipment mounting part 30 base 31 analog digital
conversion part 32 signal processing part 33 digital analog conversion part 34 piezoelectric
amplifier 50 ear type part 51 artificial auricle 52 artificial External ear canal 53 Artificial
external ear canal 54 Support member 55 Vibration sound detection unit 56 Vibration detection
element 57 Hemispherical model 60 Air conduction sound detection unit 61 Tube member 62
Microphone unit 70 Holding unit 71 Support unit 72 Arm unit 73 Movement adjustment unit 80
Anechoic space Part 81 Wedge-shaped sound absorbing layer 82 Holes for connection 91, 92
Speaker parts 110, 210 Measurement system 120 Acoustic device mounting part 130 Head
model 131 Ear-shaped part 132 Artificial auricle 133 Artificial external ear canal 134 Artificial
external ear canal part 135 Vibration sound detector 136 Air conduction sound detection unit
141 rotary shaft 142 knob 200 measurement unit 300 sensitivity adjustment 301, 302 Variable
gain amplification circuit 400 Signal processing unit 410 A / D conversion unit 411, 412 A / D
conversion circuit 420 Frequency characteristic adjustment unit 421 Equalizer 430 Phase
adjustment unit 431 Variable delay circuit 440 Output combining unit 450 Frequency analysis
unit 451 453 FFT 460 storage unit 470 signal processing control unit 500 PC 510 connection
cable 520 storage unit 530 control unit 540 display unit 541 setting menu 542 test menu 543
recording menu 544 analysis menu 545 playback menu 546 hearing aid standard measurement
menu 600 printer 700 test sound presentation unit
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