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JP2002027597

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DESCRIPTION JP2002027597
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
microphone with an induction loop. In particular, the present invention is particularly useful
when used in combination with a hearing aid in that it can increase the clarity of the hearing aid.
[0002]
BACKGROUND OF THE INVENTION Hearing aids are widely used as a supplement to the hearing
of people with poor hearing. However, since ordinary hearing aids do not have reception
directivity and frequency selectivity, unnecessary noise is also amplified when the surrounding
noise is large or when the other party of the conversation is separated to some extent, the
conversation It can be difficult.
[0003]
Various methods have been proposed to solve this. One of the methods is to connect a directional
microphone to the external input terminal of the hearing aid with a cable and direct the
microphone toward the other end of the conversation to make the conversation easier to hear.
However, this method is not good in appearance because the hearing aid and the directional
microphone are connected by a cable, and the directional microphone and the cable interfere
with storage and carrying, and the work of connecting the microphone to the hearing aid is
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troublesome And so forth.
[0004]
The second method is a method in which the other party's speech sound is transmitted through a
wireless microphone, this is received by the receiver and the demodulated voice is heard by the
earphone, or magnetic induction to the earphone terminal of this receiver is made. It is a method
of connecting a device and inductively coupling the magnetic induction device and a hearing aid
to hear sound. While this method has the advantage of eliminating the need to use a cable
connecting the microphone and the hearing aid, it requires many pieces of equipment such as a
wireless microphone, magnetic induction device, earphones, etc., which is cumbersome to
manage and inconvenient to carry. In addition, there is a disadvantage that preparation for use is
troublesome.
[0005]
A third method is to incorporate an FM receiver in a hearing aid and to transmit an audio signal
from a dedicated wireless microphone. According to this method, it is necessary to purchase a
dedicated hearing aid having a built-in FM receiver and a wireless microphone, which is costly
and has a disadvantage that only a person wearing the dedicated hearing aid can receive.
[0006]
[0006] A drawback of these methods is that only the cable is considered for the wired one and
the radio wave for the wireless one as the interface connecting the microphone for receiving the
speaker's voice and the hearing aid.
[0007]
SUMMARY OF THE INVENTION The present invention has been proposed in view of the above
problems, and an object of the present invention is to transmit an audio signal to a receiving
apparatus such as a hearing aid by magnetic field coupling. It is providing a microphone with an
induction loop.
[0008]
SUMMARY OF THE INVENTION In order to achieve the above object, the present invention
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generates a magnetic field driven by a microphone element for receiving voice and a signal
corresponding to an output from the microphone element. An inductive loop, and an inductive
loop equipped microphone.
[0009]
In one embodiment of the present invention, the microphone element, an amplifier circuit for
amplifying the output of the microphone element, an output coil coupled to the output of the
amplifier circuit, and the inductive loop Means for magnetically coupling to a coil are provided in
the housing, the induction loop being attached to the housing.
[0010]
The output coil and the induction loop can be coupled, for example, by a magnetic core.
Further, it is desirable that the microphone element and the induction loop be configured to be
removable with respect to the housing.
[0011]
Preferably, the microphone element has narrow directivity, for example, a secondary pressure
gradient microphone so that only desired voice can be heard.
[0012]
The voice received by the microphone element flows through the induction loop after being
converted to the corresponding current.
This generates from the inductive loop a magnetic field corresponding to the received speech.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION FIG. 1 is a diagram schematically showing
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one embodiment of a microphone according to the present invention.
In the same figure, the microphone 10 includes a casing forming the main body 1 and an
induction loop 2 provided at one end of the main body 1.
Attached to the other end of the main unit 1 is a microphone element 3 for receiving a sound
from a sound source such as a speaker.
A through hole 4 is formed at one end of the main body 10, and an induction loop 3 is attached
so as to pass through the through hole 4. The induction loop 2 generates a magnetic field
corresponding to the sound from the speaker or other sound source. It is desirable that the
induction loop 2 doubles as a hand strap or a neck strap. Also, the induction loop 2 may be
configured to be extendable.
[0014]
Specifically, as shown in FIG. 2A, the sound input to the microphone element 3 is converted into
an electric signal corresponding to the sound by the microphone element 3, and the electric
signal is amplified by the amplifier circuit 5. Is amplified and applied to the output coil 6. Thus, a
current corresponding to the sound input to the microphone element 3 flows through the output
coil 6. Since the inductive loop 2 is magnetically coupled to the output coil 6, a current
corresponding to the current flowing through the output coil 6, that is, the current corresponding
to the sound input to the microphone element 3 also flows through the inductive loop 2. Thus, a
magnetic field corresponding to the sound input to the microphone element 3 is generated
around the induction loop 2.
[0015]
In order to magnetically couple the output coil 6 and the induction loop 2, for example, as shown
in FIG. 2 (b), an output coil is provided around a ring-shaped magnetic core 7 having a through
hole at its center. 6 may be wound and the induction loop 2 may be passed through the through
hole of the magnetic core 7.
[0016]
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The magnetic field generated by the inductive loop 2 can thus be received by a receiver provided
with a magnetic field receiving element such as an inductive coil.
An example of a receiver is a hearing aid carried by a person such as an elderly person or a
person with a poor hearing who has insufficient hearing ability. In this case, it is desirable that
the microphone 10 shown in FIG. 1 is designed to have high sensitivity to a certain direction,
such as a unidirectional microphone, and in particular, a narrow directional microphone is used
as the microphone of the present invention. Is preferred. By designing in this way, the
microphone 10 can pick up the sound from the sound collection target with some emphasis, even
if it is far from the sound collection target that is the sound source, or there is much noise around
it. It is from.
[0017]
FIG. 2 (c) schematically illustrates the use of the microphone 10 of the present invention with a
hearing aid 20, wherein the in-ear hearing aid 20 has an induction coil inductively coupled to the
induction loop 2. It has built-in. As a result, the magnetic field generated by the induction loop 2
is received by the induction coil inside the hearing aid 20 to generate an electromotive force in
the induction coil, and by amplifying this and converting it into air vibration, the sound is
transmitted from the hearing aid 20 Be regenerated.
[0018]
An example of the narrow directional microphone described above is a secondary pressure
gradient microphone configured as shown in FIG. In this microphone, two unidirectional
microphone elements are arranged at an interval d and the front axes of the microphone
elements coincide with each other, and the difference between the outputs of the respective
microphone elements is used as an output. . The distance d is, for example, 40 mm. The
secondary pressure gradient microphone is characterized in that the sensitivity in the right
lateral direction is almost zero, and exhibits a single directivity sharp in the front direction as
compared to a conventional unidirectional microphone.
[0019]
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FIG. 4 is a view schematically showing another embodiment of the induction loop microphone
according to the present invention. In this embodiment, the induction loop 2 is separate from the
main body 1 and is detachable from the main body 1. In order to realize this, the output coil 6
comprises a primary coil 61 connected to the output of the amplifier circuit 5 and a secondary
coil 62 magnetically coupled to the primary coil, both ends of the secondary coil 62 being the
main body It is connected to the output terminals 81 and 82 provided at the end of 1
respectively. Corresponding to this, at both ends of the induction loop 2, terminals 21 and 22
which can be attached and detached to and from these output terminals 81 and 82 are provided.
Specifically, the output terminals 81 and 82 are jacks, and the terminals 21 and 22 of the
induction loop 2 are plugs. Thereby, by inserting the terminals 21 and 22 of the induction loop 2
into the output terminals 81 and 82, an electrical connection between the induction loop 2 and
the output coil 6 is made, and the induction loop 2 is attached to the main body 1 It is
mechanically held against.
[0020]
The primary coil 61 and the secondary coil 62 are not necessarily required, and the output of the
low frequency amplifier may be directly connected to the output terminals 81 and 82 without
using these coils. As described above, the configuration in which the primary coil 61 and the
secondary coil 62 are not used has a problem that impedance matching with the induction loop 2
is difficult to obtain compared to the case where these coils are used, but in terms of cost It is
advantageous.
[0021]
Although one embodiment of the induction loop microphone according to the present invention
has been described above, the present invention is not limited to this, and various modifications
are possible. For example, (1) a variable resistor can be combined with the amplifier circuit 5 so
that the output of the microphone 10 can be adjusted, (2) a switch so that the directivity of the
microphone 10 can be changed in a direction easy to hear (3) the main body 1 is bisected into a
first portion having the microphone element 3 and a second portion having the amplification
circuit 5, the output coil 6 and the induction loop 2, and these portions The microphone element
3 can be made replaceable by making it possible to connect electrically and mechanically
detachably using an appropriate means.
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[0022]
As described above, according to the present invention, a receiver incorporating an induction coil
capable of magnetic field coupling with an induction loop can be received only by taking it out
and directing it to a sound source when necessary. It is very easy to use, and it can be used easily
even by people who are new to or who are not familiar with the use of the device. For example,
when speakers from different locations speak one after another There is a special effect that it is
possible to respond promptly to the locational change of such sound source.
[0023]
In particular, when the microphone according to the present invention is used in combination
with a hearing aid, the clarity of the output sound of the hearing aid can be increased, so that it is
possible to hear the necessary sound without being bothered by ambient noise and the like. The
effect of becoming
This effect is particularly noticeable when narrow microphones are used for the microphone
element, for example, when the microphone element is a secondary pressure gradient
microphone, the sensitivity in the lateral direction is substantially zero and the front direction is
A microphone having sharp directivity can be provided.
[0024]
Further, by making the induction loop detachable with respect to the housing, the housing and
the induction loop may be stored separately when not in use, which is convenient for carrying,
and the microphone for the microphone housing By making the element exchangeable, it is
possible to achieve an effect that the characteristics of the microphone can be easily changed.
[0025]
Brief description of the drawings
[0026]
1 is a view schematically showing an embodiment of a microphone according to the present
invention.
[0027]
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FIG. 2 (a) is a diagram for explaining the configuration of the microphone of FIG. 1 using an
electric circuit, and FIG. 2 (b) shows a configuration example for coupling the output portion of
the microphone of FIG. It is a figure, (c) is a figure showing the use condition of the microphone
of FIG.
[0028]
3 is a diagram for explaining a secondary pressure gradient microphone suitable for the
microphone according to the present invention.
[0029]
4 is a view schematically showing another embodiment of the microphone according to the
present invention.
[0030]
Explanation of sign
[0031]
10: microphone, 20: hearing aid, 1: main body, 2: induction loop, 3: microphone element, 4:
through hole, 5: amplification circuit, 6: output coil, 7: magnetic core
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