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JPS62274900

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DESCRIPTION JPS62274900
[0001]
3. Detailed Description of the Invention (Industrial Field of Application) This invention relates to
an ear canal insertion type microphone for making a very high fidelity pinaural recording. (Prior
Art) When the conventional ear canal insertion type microphone is used, the ear canal population
is acoustically closed, and the acoustic condition unique to the ear canal changes, thereby
significantly deteriorating the acoustic fidelity of the ear canal. Also, the acoustic closure of the
entrance to the ear canal may be slightly moderated by the shed, only if the ear canal insertion
type microphone is loosely inserted into the ear canal, but this was largely dependent on chance.
It was a thing. (Problems to be Solved by the Invention) The use of the above-mentioned prior art
causes the following various problems. (A) The acoustic condition of the ear canal is a natural
condition with closed tube acoustic characteristics with the tympanic membrane closed.
However, when using the conventional ear canal insertion type microphone, the closed wall
moves because the sound stops at the microphone position. And, the tube length changes with
different closed tube acoustics. Therefore, the acoustic signal taken out was unnatural and
unreliable @ (b) When used, the tympanic membrane of the person providing the human head
leaked from the gap between the insertion type microphone and the ear canal Only sound and
solid-borne sound transmitted through the human body can be transmitted, so it is not possible
to faithfully hear external sounds. (C) In addition to closing the eardrum's membrane, closing the
ear canal insertion type microphone makes it possible to create a closed tube without an
opening, which causes resonance noise that can not be used in an unused state. As a result, extra
resonant sound is mixed in the extracted acoustic signal. (D) It is known that the air in the closed
pipe of (D) has little or no loss of sound transmission. Therefore, the change in air pressure due
to yawing, internal noise generated near the tympanic membrane, and noise propagating in the
imitation human head are transmitted to the ear canal insertion type microphone more often
than in the unused state. A lot of noise is mixed in the sound signal which has been dropped. An
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object of the present invention is to solve the above-mentioned problems of the external ear
canal microphone. (Means for Solving the Problems) In order to achieve this object, the present
invention is configured as follows. That is, the ear canal insertion type microphone according to
the present invention comprises a small microphone unit, an ear canal contact unit, and a free
propagation path of sound, the small microphone unit is connected to the ear canal contact unit,
and the small microphone unit and the ear canal contact unit An ear canal insertion type
microphone obtained by providing a sound free propagation path nearby.
When the present invention is inserted into the ear canal, the ear canal contact portion can be
made to contact and be fixed to the ear canal population, and at the same time, the sound wave is
located at the tympanic membrane position because there is a free propagation path of sound.
The sound conditions of the sound waves are not influenced by the presence or absence of the
microphone insertion because they are not closed at the microphone position. An embodiment of
the present invention will be described with reference to the attached drawings. First
Embodiment A first embodiment of the present invention will be described with reference to
FIGS. 1 to 3. The external auditory canal insertion type microphone according to the first
embodiment includes a small microphone unit 1, an external auditory canal contact unit 2
shaped so as to fit the entrance of the external ear canal, and a free propagation path 3 of sound,
and the small microphone unit 1 is an ear canal contact unit An external auditory canal insertion
type microphone 4 can be obtained by providing the small microphone unit】 and the free
propagation path 3 of sound near the ear canal contact unit 20. By inserting the abovementioned ear canal insertion type microphone 4 into the ear canal, the ear canal contact portion
can be made to contact and be fixed to the entrance of the ear canal, and at the same time, there
is a free propagation path 3 of sound though it is fixed. The sound wave reaches the tympanic
membrane position, and the acoustic condition of the sound wave is not influenced by the
presence or absence of the microphone insertion because it is not closed at the microphone
position. Second Embodiment A second embodiment of the present invention will be described
with reference to FIGS. 4 to 6. The ear canal insertion type microphone of the second
embodiment comprises a small microphone unit 1, an ear canal contact portion 5 having a force
that the entrance of the ear canal extends outward and inward, and a free propagation path 3 of
sound. The external ear canal insertion type microphone 6 is connected to the external ear canal
contact portion 5 and obtained by providing a free transfer ir circuit 3 near the small
microphone unit 1 and the external ear canal contact portion 5. When the above-described ear
canal insertion type microphone 6 is inserted into the ear canal, the ear canal contact portion
acts in a direction to widen the ear canal, and the free propagation path of the sound of the ear
canal population has been narrowed by inserting a small microphone unit The area can be
controlled in the expanding direction for the first time by the external ear canal expansion force
of the external ear canal contact portion 5. In the present embodiment, therefore, the ear canal
dilation force is controlled so that the opening area on the day before the microphone is inserted
and the effective area of the free sound propagation path 3 become equal. Therefore, the acoustic
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change around the ear canal due to the use of the ear canal insertion type microphone 6 is
extremely reduced. (Effects of the Invention) The present invention has the following excellent
effects. (A) The acoustic condition of the ear canal is a natural condition with closed tube acoustic
characteristics with the tympanic membrane closed. However, when using the conventional ear
canal insertion type microphone, the closed wall moves because the sound stops at the
microphone position. And, the tube length changes with different closed tube acoustics.
Therefore, the acoustic signal extracted was unnatural and unreliable. On the other hand,
according to the external auditory canal insertion type microphone 4 of the present invention,
the sound wave can reach the tympanic membrane position because of the free propagation path
3 of the sound, so that the movement of the closed wall does not occur. Can eliminate the change
in acoustic characteristics due to closed wall movement. (B) When using the conventional ear
canal insertion type microphone, only the sound leaking from the gap between the microphone
and the ear canal and the solid propagation sound transmitted through the human body are
transmitted to the tympanic membrane of the person who is offering human head There is no, so
I can not faithfully open the outside sound. On the other hand, according to the external auditory
canal insertion type microphone 4 of the present invention, the sound wave can reach the
tympanic membrane position because of the free propagation path 3 of the sound, and therefore
the external sound can be faithfully opened. (I) Using the conventional external auditory canal
insertion microphone, in addition to the tympanic membrane closed wall, the external auditory
canal insertion microphone can be closed, thus creating a closed tube without an opening, and
hence unused condition Otherwise, resonance sounds are produced, and thus extra resonance
sounds are mixed in the extracted acoustic signal. On the other hand, according to the external
auditory canal insertion type microphone 4 of the present invention, the sound wave can reach
up to the tympanic membrane position because of the free propagation path 3 of sound. Can also
be removed. (D) It is known that the air in the closed pipe in (b) above has extremely low sound
transmission loss. Therefore, the change in air pressure due to yawing, internal noise generated
around the tympanic membrane, and noise propagating in the imitation human's hood will be
transmitted to the ear canal insertion type microphone more often than in the unused state. A lot
of noise gets mixed in the signal. On the other hand, according to the external auditory canal
insertion type microphone 4 of the present invention, the sound wave can reach the tympanic
membrane position due to the free propagation path 3 of sound, so there is no closed tube
without an opening, so the above noise propagation Can also be eliminated. (N) Conventionally,
the area of the free propagation path of the sound of the entrance of the ear canal has been
narrowed by the insertion of the ear canal insertion type microphone. However, the ear canal
insertion type microphone (6) of the present invention has an ear canal expansion force Since the
ear canal contact portion 5 and the free propagation path 3 of sound are provided, the area of
the free propagation path of the sound of the ear canal can be controlled in a widening direction
as long as the material of the ear canal is soft. Therefore, the following effects are achieved. (A) It
is preferable to miniaturize the microphone unit, since the area of the free propagation path of
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the outer ear suitable sound does not need to be narrowed as much. However, the low frequency
characteristic deterioration due to the miniaturization is also accompanied.
This contradictory problem can be solved by the above-mentioned effect of the ear canal
expansion force. (B) The external ear canal expansion force can also be configured to be
controlled so that the opening area of the ear canal entrance when the microphone is not
inserted and the effective area of the free propagation path 3 become equal. The use of the
microphone 6 made it possible to make the acoustic change around the ear canal extremely
small. Therefore, the effect of said (I)-(D) can be promoted further.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a perspective view.
FIG. 2 is a partial cross section and a perspective view. FIG. 3 is a perspective view. FIG. 4 is a
perspective view. FIG. 5 is a cross-sectional view showing an example of use of the ear canal
insertion type microphone of FIG. FIG. 6 is a perspective view. In the figure, 1: small microphone
unit 2: ear canal contact portion. 3: sound free propagation path, 4: external ear canal insertion
type microphone. 5: Ear canal contact part 6: 6: Ear canal insertion type microphone.
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