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JPH10117400

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DESCRIPTION JPH10117400
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
device for testing a hearing aid.
[0002]
2. Description of the Related Art Hearing aids are generally used by people who are deaf, but
when checking or examining their operation or adjustment status, an examiner who is
enthusiastic about the output sound (sound output) of the hearing aid actually You need to listen
and listen.
[0003]
For this reason, when confirming the operation state or adjustment state of the hearing aid, a
sound conduit such as a sound conduit type stethoscope is used.
That is, the sound conduit is a pipe of about 30 cm in length made of synthetic rubber, vinyl or
the like, and one end thereof is pressed against the earphone portion of the hearing aid and the
other end is inserted into the examiner's ear. The examiner listens to the sound output from the
camera through the sound conduit.
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1
[0004]
However, in the case where confirmation is performed using the above-described sound conduit,
the following problems occur due to the sound conduit. 1. Since the output sound of the hearing
aid propagates through the sound conduit for a long time, the sound quality may change or
deteriorate, which may cause an error in the confirmation of the operation of the hearing aid. 2.
Since the output of the hearing aid enters the examiner's ear directly through the sound conduit,
if the examiner forgets to keep the hearing aid turned down, a sound level as high as, for
example, 130 dB gets into the examiner's ear , Examiner may suffer from acoustic trauma.
[0005]
The present invention is intended to solve such problems, and to provide an inspection apparatus
capable of faithfully transmitting the output sound of a hearing aid to the examiner's ear and
ensuring the safety of the examiner. is there.
[0006]
For this reason, in the present invention, the present invention comprises a sound pickup unit, a
signal processing circuit, an earphone unit, and equalizer means of frequency characteristics, and
the sound pickup unit is located in the ear canal. An acoustic pipe acoustically simulating a plane
wave propagation of an acoustic wave; and a microphone unit which picks up the acoustic wave
in the acoustic pipe and outputs an audio signal, and the signal processing circuit determines the
maximum level of the audio signal. And an earphone unit for converting an audio signal from the
signal processing circuit into a sound wave, and another acoustic tube for propagating the
converted sound wave into a plane wave of an examiner's ear canal The apparatus for
examination of a hearing aid is adapted to correct the frequency characteristic of the sound wave
supplied to the auditory canal of the examiner by the equalizer means.
Therefore, the output sound of the earphone of the hearing aid is picked up by the sound
collection unit to be an audio signal, and this audio signal is level limited and then supplied to the
earphone unit to be converted to sound, which is supplied to the examiner's ear Be done.
[0007]
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2
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an example of an
inspection apparatus according to the present invention, and reference numeral 10 is its sound
pickup unit. The sound pickup unit 10 picks up the output sound (sound output) of the earphone
of the hearing aid, converts it into an audio signal and outputs it, and at this time, simulates
acoustically the ear canal of the user of the hearing aid. It is. For this reason, this sound collection
unit 10 is configured, for example, as shown in FIG.
[0008]
That is, in FIG. 2, the acoustic tube 11 corresponds to the ear canal of the user when a part
thereof uses a hearing aid, and is formed of metal or plastic in a pipe shape having a circular
cross section, The inner diameter is 5.5 to 8 mm corresponding to the inner diameter of the ear
canal, and the length is 7 to 8 cm, for example.
[0009]
The left end 11A in the drawing of the acoustic tube 11 is open, and when testing the hearing
aid, the earpiece (in the case of the drawing, the earpiece-type hearing aid earphone 1) of the
hearing aid to be examined is , Mounted by means of a coupling adapter 12.
Further, a sound absorbing material 13 such as a glass fiber is filled inside the end 11B on the
right side in the drawing of the acoustic tube 11 to make an acoustically non-reflection
termination.
[0010]
Furthermore, an opening (perforation hole) 14 is formed at a position away from the end portion
11A by, for example, 10 mm or more on the wall surface of the acoustic tube 11, and the
microphone unit 15 is provided here. In this case, the microphone unit 15 may be, for example,
electret non-directional, but the microphone unit 15 does not interfere with the sound wave
propagation of the sound tube 11 to the inside of the sound tube 11 on the front surface thereof.
The amount of protrusion of is reduced.
[0011]
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In FIG. 1, reference numeral 20 denotes a signal processing circuit that processes the audio
signal from the sound collection unit 10. That is, the audio signal from the microphone unit 15 is
supplied to the limiter 22 through the microphone amplifier 21 so that the maximum volume is
limited to an amplitude that does not cause auditory trauma to the examiner. Then, this
amplitude-limited audio signal is supplied to the equalizer circuit 24 through the variable resistor
23 for volume adjustment, and for example, the frequency component of 2 to 4 kHz is boosted
by about 15 dB, and the equalizer processed audio A signal is supplied to the earphone unit 30
through the output amplifier 25.
[0012]
In this case, the earphone unit 30 converts the sound signal from the amplifier 25 into sound and
causes plane wave propagation to supply the sound to the examiner's ear of the hearing aid. It is
configured as shown in.
[0013]
That is, in FIG. 3, the acoustic tube 31 corresponds to the examiner's ear canal when the
earphone of the hearing aid is attached, and this is the same configuration as the acoustic tube
11 of the sound collection unit 10, The right-hand end 31A of the lower case 31 is open, and this
end 31A is inserted into the ear canal 3 of the examiner at the time of examination of the hearing
aid.
Further, in order to secure the insertion and the sound insulation from the outside, an earplug
type earpiece 32 made of, for example, silicone rubber is provided at the end 31A. Further, a
sound absorbing material 33 such as a glass fiber is filled inside the end 31B on the left side in
the drawing of the acoustic tube 31 to make an acoustically non-reflection termination.
[0014]
In addition, an opening (perforation hole) 34 is formed at a position within 30 mm, for example,
from the end 31A of the wall surface of the acoustic tube 31, and an earphone unit 35 is
provided here. In this case, the earphone unit 35 can be, for example, an electro-acoustic
transducer similar to a dynamic type earphone (earhole type headphone) used in a headphone
stereo or the like. Further, the amount of protrusion of the front surface of the acoustic tube 31
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4
into the interior of the acoustic tube 31 is reduced so that the earphone unit 35 does not
interfere with the sound wave propagation of the acoustic tube 31. Then, an audio signal from
the amplifier 25 is supplied to the earphone unit 35.
[0015]
Further, in FIG. 1, the audio signal from the amplifier 21 is supplied to the level detection circuit
26, the audio signal level is detected, the detection output is supplied to the display element, for
example, the LED 27, and the light emission of the LED 27 is the level of the audio signal. It is
controlled according to Further, an audio signal from the amplifier 21 is taken out to the external
output terminal 28, and the measuring device or the recording device 100 is connected to the
terminal 28 as needed.
[0016]
Although not shown, in an actual inspection apparatus, the sound pickup unit 10 and the signal
processing circuit 20 are housed in a box, and the cord connecting the amplifier 25 and the
earphone unit 35 has an appropriate length. Ru.
[0017]
According to such a configuration, it is possible to confirm or examine the operation state, the
adjustment state, etc. of the target hearing aid as follows.
That is, as shown in FIG. 2, the earphone unit 1 of the hearing aid is set at the end 11A of the
acoustic tube 11, and the acoustic tube 31 is inserted into the ear canal 3 of the examiner as
shown in FIG.
[0018]
Then, the output sound from the earphone 1 is input to the end 11A of the acoustic tube 11. At
this time, since the end 11B is filled with the sound absorbing material 13 and is acoustically
non-reflection termination, the earphone is The output sound of the unit 1 propagates as a plane
wave inside the acoustic tube 11.
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[0019]
Then, the sound wave propagating in the plane wave is collected by the microphone unit 15, and
the sound signal is supplied to the drive unit 31 through the signal processing circuit 20, and is
emitted as sound as shown in FIG.
Then, the radiated sound waves propagate in a plane wave inside the acoustic tube 31 and
further reach the eardrum 4 through the ear canal 3 of the examiner.
[0020]
Therefore, the examiner can hear the output sound of the hearing aid, and can confirm or
examine the operation state or adjustment state of the hearing aid.
[0021]
At this time, the level of the audio signal from the amplifier 21 is detected by the detection circuit
26, and the detection output drives the LED 27. For example, when the output sound pressure of
the hearing aid is less than 100 dB, the LED 27 does not light but 100 dB When it exceeds 120
dB, it is turned on red.
[0022]
Thus, according to this inspection apparatus, the operating state and adjustment state of the
hearing aid can be confirmed or inspected, but in particular, according to this inspection
apparatus, the output sound of the hearing aid propagates in the sound conduit for a long time.
As a result, there is no change or deterioration of the sound quality, and no error occurs in the
confirmation of the operation of the hearing aid.
Furthermore, since the outside is acoustically shielded, the influence of the outside noise on the
inspection sound is small.
[0023]
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In addition, the portion of the acoustic tube 11 between the end 11A and the microphone 15
acoustically simulates the ear canal of the user of the hearing aid, and is equivalent to the sound
reaching the tympanic membrane of the user. The sound will be picked up by the microphone
15.
Furthermore, when the hearing aid is used, an air chamber is formed by the ear canal being
closed by the earphone, and this air chamber causes resonance, and the change in frequency
characteristics due to this resonance is reproduced by the equalizer circuit 24.
[0024]
Therefore, when confirming or examining the operating condition or adjustment condition of the
hearing aid, it is possible to confirm or examine the hearing aid in the condition in which it is
actually used, and the examiner can accurately recognize the sound quality of the hearing aid .
[0025]
Furthermore, a part of the sound wave emitted from the earphone unit 35 reaches the tympanic
membrane 4 and is reflected, and this reflected wave is absorbed by the sound absorbing
material 33 filled in the end 31 B of the acoustic tube 31.
Further, the sound wave emitted from the drive unit 35 toward the end 31 B is also absorbed by
the sound absorbing material 33. Therefore, a standing wave does not occur inside the acoustic
tube 31 and the ear canal 3, and no disturbance occurs in the frequency characteristics from the
driver unit 35 to the eardrum 4 of the examiner.
[0026]
Further, in the signal processing circuit 20, the maximum level of the audio signal supplied from
the microphone 15 to the earphone unit 35 is limited by the limiter 22, so when the examiner
forgets to turn down the volume of the hearing aid The high level of sound pressure does not get
into the examiner's ear, and the examiner is not injured acoustically.
[0027]
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Furthermore, the output sound pressure of the hearing aid can be known by the lighting state of
the LED 27.
Further, since an audio signal of the output sound of the hearing aid collected by the microphone
21 is output to the terminal 28, the characteristics of the hearing aid can be electrically
confirmed by connecting a recording device or a monitor to the terminal 28. Alternatively, this
can easily be done when testing.
[0028]
FIG. 4 shows another example of the earphone unit 30. In this example, a cup-shaped box 41 is
provided at the rear of the earphone unit 35, and a port 42 is provided in the box 41. The box
body 41 and the port 42 constitute, for example, a resonator that resonates at a frequency of 2
to 4 kHz. Further, a sound absorbing material 43 is provided inside the box body 41, and the
magnitude of the resonance thereof is set to a predetermined level.
[0029]
Therefore, according to the earphone unit 30, since the air chamber is formed by the members
41 to 43 being closed by the earphones of the hearing aid by the members 41 to 43, the
equalizer circuit 24 for electrically realizing the air chamber is realized. It can be omitted.
[0030]
In the above description, the acoustic tube 31 of the earphone unit 30 may be bent in a shape of
a half, as shown in FIG. 5, for example. In this way, the earphone unit 30 can be used as an
examiner's ear. This is stable when worn.
Also, the order of the limiter 22, the variable resistor 23 and the equalizer circuit 24 can be
interchanged.
[0031]
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8
According to the present invention, it is possible to accurately confirm or check the operating
condition or adjustment condition of the hearing aid, and to confirm the sound quality. In
addition, it is possible to securely protect the examiner's hearing. Furthermore, these things can
contribute to the efficiency improvement of the confirmation work and adjustment work of the
hearing aid.
[0032]
Brief description of the drawings
[0033]
1 is a system diagram showing an embodiment of the present invention.
[0034]
2 is a cross-sectional view showing an embodiment of a part of the present invention.
[0035]
3 is a cross-sectional view showing an embodiment of a portion of the present invention.
[0036]
4 is a cross-sectional view showing another embodiment of a portion of the present invention.
[0037]
5 is a cross-sectional view showing another embodiment of a portion of the present invention.
[0038]
Explanation of sign
[0039]
DESCRIPTION OF SYMBOLS 10 ... Sound collection part, 11 ... Acoustic pipe, 12 ... Coupling
adapter, 13 ... Sound absorption material, 15 ... Microphone unit, 20 ... Signal processing circuit,
22 ... Limiter, 23 ... Variable resistor, 24 ... Equalizer circuit, 30 ... Earphone unit, 31: sound tube,
32: earpiece, 33: sound absorbing material, 35: earphone unit, 41: box, 42: port, 43: sound
absorbing material
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