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DESCRIPTION JP2014039315

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DESCRIPTION JP2014039315
Abstract: To suppress noise, howling, and the like generated by rubbing a case of a hearing aid
with an external object, and to output clear sound that is easy to hear from an earphone.
SOLUTION: The hearing aid 10 amplifies a voice collected by a voice microphone 16 and outputs
the amplified voice from an earphone 19. The hearing microphone 10 collects outside voice and
converts it into an electric signal, and the inside of a housing of the hearing aid 10 Noise
microphone 17 that collects the noises of the noise and converts it into an electric signal, and a
subtraction unit 22 that subtracts the noise microphone electric signal that is the electric signal
from the noise microphone 17 from the speech microphone electric signal that is the electric
signal from the speech microphone 16 And an earphone 19 which converts the subtracted
electric signal into a sound and outputs the sound. [Selected figure] Figure 1
Anti-scratch hearing aid
[0001]
The present invention relates to a hearing aid that reduces noise generated in the hearing aid.
[0002]
With the progress of aging, the use of hearing aids is spreading.
However, in the hearing aid, noise and howling are likely to occur, which often makes it difficult
to hear the voice of the person who wants to hear it.
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1
[0003]
At present, many small-sized hearing aids integrated with earphones are widely marketed, which
are stuffed in the hole of the ear or attached to the rim of the ear. Such a hearing aid is expensive
because of its small size, and requires small batteries and is expensive. In addition, such a smallsized hearing aid is likely to generate howling because the distance between the microphone and
the earphone is close, the load on the ear is large, and it is difficult to use for a long time.
[0004]
In order to solve such problems, for example, Patent Document 1 below discloses a hearing aid
that uses application feedback cancellation to reduce problems due to acoustic feedback and
mechanical feedback. The patent of US Pat. No. 5,956,986 relates to a method of controlling the
adaptation speed in a feedback cancellation system, such a hearing aid, and a hearing aid and
system incorporating such a method.
[0005]
Further, in Patent Document 2 below, frequency processing for changing the frequency
characteristic without changing the time axis of digitized voice and a time axis for expanding the
time axis of voice without changing the pitch thereof are disclosed. Processing is disclosed.
[0006]
Further, in Patent Document 3 below, a voice having an amplitude limiting circuit in which the
amplitude suppression of the input signal is performed by changing the bias of the potential
serving as the starting point of the signal waveform or subtracting or adding another signal. It is
disclosed that the signal amplitude suppression circuit includes a subtractor and means for
shifting the phase of the signal input to the subtractor.
[0007]
Further, Patent Document 4 below discloses a patent for preventing howling that occurs when
taking out a hearing aid from the ear canal.
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2
[0008]
Further, Patent Document 5 discloses a hearing aid that attaches a noise canceller to an earphone
to cancel ambient environmental noise.
[0009]
In the hearing aid, the earphones are separated from the hearing aid body containing the
microphone and the control unit, and a rechargeable battery is mounted in the hearing aid body,
and the hearing aid body can be put in a pocket, taken from the neck, etc. There are also those
used in the embodiment.
There is still a need for such forms of hearing aids, as such hearing aids look similar to portable
music players and radios, and it is difficult for others to notice that they are being used.
[0010]
Patent No. 4923102 Patent No. 3308567 Patent No. 4825427 Patent No. 3643896 Patent No.
3326958
[0011]
However, while the hearing aid is in use, nothing has been found that actively solves the noise
and howling caused by rubbing the case of the hearing aid with an external object.
In addition, although measures are taken, such as through a band pass filter for extracting signals
in the human voice band, it is the current situation that noise can not be sufficiently eliminated.
[0012]
The present invention has been made in view of the above circumstances, and an object of the
present invention is to suppress noise and howling caused by rubbing the case of a hearing aid
with an external object, and to output clear sound easy to hear from the earphone It is to do.
[0013]
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One aspect of the present invention for solving the above problems is, for example, a hearing aid
that amplifies voice collected by a voice microphone and outputs the amplified voice from an
earphone, and the voice microphone collects external voice and converts it into an electrical
signal. A noise microphone that collects noise in the housing of the hearing aid and converts the
noise into an electrical signal; a noise microphone electrical signal that is an electrical signal from
the noise microphone from a voice microphone electrical signal that is an electrical signal from
the audio microphone And a earphone for converting the electric signal obtained by the
subtraction into a sound and outputting the sound.
[0014]
According to the hearing aid of the present invention, it is possible to suppress noise, howling,
and the like generated by rubbing the case exterior and the microphone exterior of the hearing
aid with an external object, and to output clear sound that is easy to hear from the earphone.
As a result, since offensive noise is reduced, even when the hearing aid is worn for a long time,
the burden on the ear can be reduced.
[0015]
In addition, the earphone is separated from the hearing aid body in which the microphone and
the control unit are housed, and a rechargeable battery is mounted in the hearing aid body, and
the hearing aid body can be carried inexpensively by putting it in a pocket or carrying it from the
neck In the hearing aid, noise is likely to be generated by rubbing with clothes etc. during use,
but in the hearing aid of the present invention, this noise can also be effectively reduced.
[0016]
Thus, by effectively removing the unpleasant noise, the hearing aid can be worn for a long time,
and the elderly communication opportunities can be increased.
By this, it is possible to promote social participation of the elderly with weak hearing who is
expected to increase in the aging society in the future.
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[0017]
It is a conceptual diagram which shows an example of the external appearance of the hearing aid
10a which concerns on one Embodiment of this invention.
FIG. 6 is a conceptual diagram for explaining an example of the arrangement of a voice
microphone 16 and a noise microphone 17 inside a housing 11;
It is a block diagram for demonstrating the principle of noise removal.
It is a conceptual diagram which shows an example of the external appearance of the hearing aid
10b which concerns on other embodiment.
It is a conceptual diagram which shows an example of the external appearance of the hearing aid
10c which concerns on other embodiment. FIG. 10 is a conceptual diagram for explaining
another example of the arrangement of the audio microphone 16 and the noise microphone 17
inside the housing 11; FIG. 10 is a conceptual diagram for explaining another example of the
arrangement of the audio microphone 16 and the noise microphone 17 inside the housing 11;
FIG. 10 is a conceptual diagram for explaining another example of the arrangement of the audio
microphone 16 and the noise microphone 17 inside the housing 11; FIG. 10 is a conceptual
diagram for explaining another example of the arrangement of the audio microphone 16 and the
noise microphone 17 inside the housing 11; It is a conceptual diagram which shows an example
of the external appearance of the hearing aid 10d which concerns on other embodiment.
[0018]
Hereinafter, embodiments of the present invention will be described with reference to the
drawings.
[0019]
FIG. 1 is a conceptual view showing an example of the appearance of a hearing aid 10a according
to an embodiment of the present invention.
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In the hearing aid 10a in the present embodiment, a housing 11 incorporating an audio
microphone 16 for collecting sound and an earphone 19 are connected via a cable 18, and the
neck cord 13 is used to lower the housing 11 from the neck, It is a type used by putting the
housing 11 in the chest pocket or lowering it to the neck. Further, the earphone 19 may be one
having a built-in speaker like a headphone, and in the present invention, these are also described
as an earphone.
[0020]
The housing 11 is provided with a voice microphone 16 for collecting external sound and
converting it into an electric signal, and a noise microphone 17 for collecting noise generated in
the housing 11. A slit 14 is provided at a position where the voice microphone 16 is provided in
the housing 11, and the voice microphone 16 can collect voice outside the housing 11 via the slit
14. A blocking wall 15 is provided between the voice microphone 16 and the noise microphone
17 inside the housing 11.
[0021]
The hearing aid 10 in this embodiment is used by lowering the case 11 containing the voice
microphone 16 from the neck or putting it in a chest pocket, so the user's clothes etc. rub against
noise every time the user moves. Occur. Further, even when the operation switch 12 is operated,
the contact between the finger and the operation switch 12 or the housing 11 generates noise.
[0022]
Such noise travels through the housing 11 and is taken in by the voice microphone 16 together
with the voice originally intended to be heard that has flowed in through the slit 14. Although the
volume of this noise itself is not large, it is generated at a position close to the voice microphone
16, so such noise is considered to be a volume of the voice microphone 16 that is louder than the
voice originally intended to be heard flowing through the slit 14. Often taken into
[0023]
FIG. 2 is a conceptual diagram for explaining the arrangement of the audio microphone 16 and
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the noise microphone 17 inside the housing 11.
[0024]
As shown in FIG. 2, a slit 14 is provided on the front of the voice microphone 16.
Since the sound that a person using the hearing aid wants to hear is sound that propagates
through the air, the sound microphone 16 collects the sound that has propagated through the air
through the slit 14.
[0025]
On the other hand, no slit is provided in the portion of the housing 11 near the noise microphone
17. As a result, the sound that the noise microphone 17 propagates in the air is not captured by
the noise microphone 17.
[0026]
Also, a blocking wall 15 is provided between the voice microphone 16 and the noise microphone
17. As a result, even when the sound propagating in the air flows into the housing 11 through
the slit 14, the amount of the sound moving around the noise microphone 17 in the housing 11
can be significantly reduced.
[0027]
By arranging the audio microphone 16 and the noise microphone 17 in the housing 11 as shown
in FIG. 2, the audio microphone 16 can be configured such that the sound propagating in the air,
the housing 11 and other objects are rubbed, etc. Noise and noise are taken in, and noise
propagating in the air is hardly taken in to the noise microphone 17, and noise such as rubbing
of the case 11 with other objects is mainly taken.
[0028]
FIG. 3 is a block diagram for explaining the principle of noise removal.
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[0029]
The voice collected by the voice microphone 16 is converted into an electrical signal and
amplified by the amplifier 20 into an electrical signal of a predetermined level.
Here, the voice taken in by the voice microphone 16 includes voice propagating in the air and
noise such as the case 11 rubbing against another object.
[0030]
The voice collected by the noise microphone 17 is converted into an electrical signal and
amplified by the amplifier 21 into an electrical signal of a predetermined level.
Here, the voice taken in by the noise microphone 17 contains almost no voice propagating in the
air, but mainly includes noise such as rubbing of the case 11 with other objects.
[0031]
The subtracting unit 22 subtracts the electrical signal of the audio amplified to the
predetermined level by the amplifier 21 from the electrical signal of the audio amplified to the
predetermined level by the amplifier 20. Thereby, in the electric signal subjected to the
subtraction processing by the subtraction unit 22, the level of the electric signal corresponding
to the component of the sound propagating in the air hardly decreases, and the housing 11 and
the other object are rubbed, etc. The level of the electrical signal corresponding to the noise
component is greatly reduced.
[0032]
The amplifier 23 sends the electric signal subjected to the subtraction processing by the
subtraction unit 22 to the earphone 19 via the cable 18. The earphone 19 converts the electrical
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signal received from the amplifier 23 into voice and outputs it.
[0033]
As a result, the earphone 19 can output clear voice in which noise such as rubbing of the housing
11 with another object is suppressed.
[0034]
The smaller the difference between the component of the noise collected by the voice
microphone 16 and the component of the noise collected by the noise microphone 17 in the
amplitude and frequency distribution, the smaller the difference after subtraction by the
subtraction unit 22. Noise components remaining in the electrical signal can be reduced.
Therefore, it is preferable that the voice microphone 16 and the noise microphone 17 use a
microphone with characteristics as close as possible.
[0035]
For example, it is preferable that the voice microphone 16 and the noise microphone 17 have the
same standard, the same model number, and the same lot.
[0036]
In addition, depending on how to select the voice microphone 16 and the noise microphone 17,
the amplifier 20 and the amplifier 21 may not be necessary.
[0037]
In addition, as one of the specific realization methods of the subtraction unit 22, for example, the
positive terminal of the output terminal of the audio microphone 16 is connected to the input
terminal of the amplifier 23, and the negative terminal of the output terminal of the audio
microphone 16 is noise. The negative terminal of the output terminal of the noise microphone 17
may be connected to the positive terminal of the output terminal of the microphone 17, and the
negative terminal of the output terminal of the noise microphone 17 may be connected to the
ground terminal of the amplifier 23.
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[0038]
By connecting in this manner, the electrical signal of noise collected by the noise microphone 17
is synthesized in reverse phase to the electrical signal of noise collected by the voice microphone
16, and collected by the voice microphone 16. The electric signal of noise can be canceled, and
the electric signal corresponding to the component of the sound propagating in the air collected
by the sound microphone 16 can be appropriately amplified by the amplifier 23.
[0039]
A band pass filter for extracting a signal to be heard, for example, a signal in the human voice
band of about 300 Hz to 3 KHz (or attenuating a signal outside the band) is used to convert each
of the voice microphone 16 and the noise microphone 17 After the signal in the human voice
band is extracted from the signal, the sound in the voice band may be reproduced more clearly
by performing subtraction processing.
[0040]
At this time, the amplifier 20 may be provided in front of the first band pass filter, or may be
provided between the first band pass filter and the subtracting unit 22.
Similarly, the amplifier 21 may be provided before the second band pass filter, or may be
provided between the second band pass filter and the subtracting unit 22.
[0041]
In addition, a third band pass filter for attenuating a signal other than the human voice band is
provided between the voice microphone 16 and the subtraction unit 22, and a human is not
provided between the noise microphone 17 and the subtraction unit 22. A fourth band pass filter
that attenuates signals other than the voice band and a band rejection filter that attenuates
signals in the human voice band may be provided.
[0042]
At this time, the amplifier 20 may be provided before the third band pass filter, or may be
provided between the third band pass filter and the subtracting unit 22.
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The amplifier 21 may be provided in front of the fourth band pass filter, or may be provided
between the fourth band pass filter and the band rejection filter, and the band rejection filter and
the subtracting unit 22 It may be provided between
[0043]
This makes it possible to further clear the voice of the human voice band.
The voice microphone 16 and the noise microphone 17 may be amplified first and then passed
through a filter circuit.
Further, the amplification circuit may be provided with a circuit for amplifying an arbitrary
sound range or adjusting a sound range to be amplified and a volume.
[0044]
The embodiments of the present invention have been described above.
Note that although the example here shows an analog circuit, the speech may be subjected to
digital conversion and then subtracted, or a circuit that performs volume increase / decrease
adjustment of the sound range may be incorporated after digital conversion.
These explanations are omitted.
[0045]
As apparent from the above description, according to the hearing aid 10 of the present
embodiment, the noise generated when the housing 11 of the hearing aid 10 rubs against an
external object is suppressed, and a clear sound that is easy to hear is output from the earphone
19 be able to.
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11
[0046]
In the embodiment described above, the hearing aid 10a of the type that can be worn on the
neck has been described as an example, but the present invention is not limited to this. For
example, the hearing aid 10b of the type of filling in the ear hole as shown in FIG. The present
invention can also be applied to a hearing aid 10c of the type shown in FIG.
[0047]
For example, as shown in FIG. 4, in the case of the hearing aid 10b of the type in which it is
packed in the hole of the ear, the voice microphone 16 and the noise microphone 17 are
provided in the housing 11, and the slit 14 is provided in front of the voice microphone 16 A
blocking wall 15 is provided between 16 and the noise microphone 17.
[0048]
Further, also in the hearing aid 10c of the type to be worn on the ear, as shown in FIG. 5, for
example, the voice microphone 16 and the noise microphone 17 are provided in the housing 11,
and the slit 14 is provided in front of the voice microphone 16 A blocking wall 15 is provided
between the microphone 16 and the noise microphone 17.
[0049]
In the hearing aids 10b of the type to be packed in the hole of the ear and the hearing aids 10c
of the type to be put on the ears, the housing 11 hardly contacts clothes etc. during use. When
doing this, noise is generated by the finger touching the hearing aid 10b.
In addition, the same thing happens when the movement of the jaw by food, the movement of the
hair, the touch of the coat, the wind on a windy day, etc.
According to the present invention, even in such a situation, unpleasant noise can be suppressed
to alleviate the burden on the ear.
[0050]
Moreover, since the distance between the voice microphone 16 and the speaker 19 is short and
the voice microphone 16 and the speaker 19 are accommodated in the same case 11, the hearing
aid 10 of the type shown in FIG. Depending on the volume of the sound outputted from 19 and
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the sensitivity of the sound microphone 16, the sound outputted from the speaker 19 may be
taken into the sound microphone 16 again through the housing 11 to cause howling.
[0051]
However, in the hearing aid 10 shown in FIG. 4 and FIG. 5, the vibration transmitted through the
housing 11 is also captured as sound by the noise microphone 17.
Then, the electric signal of voice taken in by the noise microphone 17 is subtracted by the
subtracting unit 22 from the electric signal of voice taken in by the voice microphone 16 as
described in FIG. 3.
[0052]
Therefore, in the electric signal after subtraction by the subtraction unit 22, almost no
component of the sound output from the speaker 19 and returned through the housing 11
remains.
Therefore, the hearing aid 10 of the present embodiment can also effectively suppress the
occurrence of howling.
[0053]
In the above embodiment, as shown in FIG. 2, the noise microphone 17 is disposed in the same
direction as the voice microphone 16, but the present invention is not limited to this. The noise
microphone 17 may be a voice microphone 16. It may be arranged in a different direction.
[0054]
For example, as shown in FIG. 6, the audio microphone 16 may be attached to the outside of the
housing 11 via the slit 14, and the noise microphone 17 may be attached to the inside of the
housing 11.
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As a result, the audio microphone 16 can efficiently take in the component of the noise
transmitted to the inside of the housing 11 through the housing 11 due to the case where the
housing 11 and another object rub against each other.
[0055]
For example, as shown in FIG. 7, the blocking wall 15 may be provided in the housing 11 so as to
surround the noise microphone 17.
Thereby, even if the sound propagated in the air flows into the housing 11 through the slit 14,
the noise microphone 17 can be prevented from capturing the sound. Therefore, when the
subtractor 22 subtracts the electrical signal of the voice captured by the noise microphone 17
from the electrical signal of the voice captured by the voice microphone 16, the amount of
reduction of the electrical signal of the component of the voice propagated in the air is
suppressed low. be able to.
[0056]
Also, conversely, for example, as shown in FIG. 8, the blocking wall 15 may be provided in the
housing 11 so as to surround the audio microphone 16. Even with this configuration, even if the
sound propagated in the air flows into the housing 11 through the slit 14, the noise microphone
17 can be prevented from capturing the sound.
[0057]
For example, as shown in FIG. 9, the blocking wall 15 may be provided in the housing 11 so as to
surround the voice microphone 16 and the noise microphone 17, respectively. With this
configuration, even if the circuit arrangement inside the housing 11 or the size of the space is
changed, the influence on the magnitude of the noise collected by the microphone 16 or the
noise microphone 17 can be reduced. The degree of freedom in design of the housing 11 and the
inside of the housing 11 can be increased.
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[0058]
Further, FIG. 10 shows an example in which a noise canceller is added in which an electrical
signal obtained by amplifying the noise microphone electrical signal of the noise microphone 17
and inverting the phase is added to the amplified audio microphone electrical signal. The feature
of the hearing aid 10d shown in FIG. 10 is that an earphone is provided on the upper side of the
acoustic tube 30 whose back is sealed toward the acoustic tube 30 side. The other structure is
the same as that shown in FIG.
[0059]
Further, the voice microphone 16 may be covered with an exterior protruding from the housing
11 and the exterior may be provided with a slit 14, in which case the noise microphone 17 also
has the same shape without a slit.
[0060]
Further, although not particularly described in each of the above examples, it is needless to
mention that each microphone is covered with a cushion material or the like so as not to pick up
the sound from the housing 11 or the exterior as much as possible.
[0061]
As mentioned above, although this invention was demonstrated using embodiment, the technical
scope of this invention is not limited to the range as described in the said embodiment.
It is apparent to those skilled in the art that various changes or modifications can be added to the
above embodiment.
It is also apparent from the scope of the claims that the embodiments added with such
alterations or improvements can be included in the technical scope of the present invention.
[0062]
DESCRIPTION OF REFERENCE NUMERALS 10 hearing aid 11 housing 12 operation switch 13
neck cord 14 slit 15 blocking wall 16 voice microphone 17 и и и Noise microphone, 18 и и и cable,
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19 и и и earphones, 20 и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и
ииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии
и и и и и и и и и 22
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