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(A) Industrial Application Field The present invention relates to a hearing aid. The hearing ability
of a healthy person can have directional gold first by the ability of the chamber ear effect if both
ears are healthy. Next, since it has the ability to selectively listen (the ability to focus attention on
a certain percentage of sounds), it has the ability to capture the target sound from the
surrounding noise. (B) Prior Art However, a conventional hearing aid catches surrounding sound
with a single microphone and electrically amplifies it, and only stops increasing the volume.
Therefore, the above effect can not be expected. rt In order to alleviate the above-mentioned
drawbacks recently, all microphones corresponding to both ears are used separately, and each
volume is increased. However, the appearance of human beings with deafness is very
miscellaneous, and if it is only a decline in hearing ability first of all, according to the degree of
difficulty of the both ears of both outputs of both microphones! Although it is good if it is fine, it
is inferior both in the above-mentioned ear effect ability and the selective listening ability. These
hearing aids are not effective hearing aids. The present invention has been made to alleviate the
above-mentioned drawbacks, and is characterized in that five or more omnidirectional
microphones are equally spaced on the same circumference. And a delay device for delaying all
the electric outputs of the respective microphones, and controlling the delay amount of the delay
device so that the electric output of each microbob / of the sound wave coming from a specific
direction In order to give directivity to the microphone group. (E) Operation The following is a
detailed description of the drawings. Fig. 1 is a diagram for explaining the principle of operation
of the present invention. /, и и и и и и и и N indicates N nondirectional micro-bons, and a circle with
radius R on one plane (in the figure, paper surface) Arrange at equal intervals on the lap.
Assuming that the center 2 o of a circle of radius R (hereinafter simply referred to as a reference
circle) and taking O ? / direction gold base grass, the nth microbob / is a position rotated
clockwise only with respect to the reference line 0 ? / It is in. (Pn is as in equation (1). ? n = 27
(u Nerian radian ииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии 1 It
is a sound wave surface when it has progressed. The movement amount ?Rn from the arrival of
the sound wave surface in contact with the reference circle to the arrival of the n-th microphone
is as expressed by equation (2). R R n = R (1-cos (? n-?) 1 иииииииии-(2) To go further and reach the
sound wave surface to be in contact with the reference circle, further (5) It must move by the
amount shown.
2R-.DELTA.Rn = R (+-4-cos (q) n-.theta .-- Month ------- (di) sound velocity fv, the electrical output
of the n-th microphone is (4) equation. As shown in FIG. 4 (4), it is delayed by time (hereinafter
referred to as phase alignment in the ? direction). If the electric outputs of the N microphones
are combined, the electric output of the sound wave arriving from the ? direction decreases, and
the electric output of the sound wave coming from a direction deviated from the maximum 9?
direction decreases. In other words, it will have directional gold. With the phasing direction ? =
0, the directivity ?? when sound newly enters from the r direction in the clockwise direction
with respect to the reference line ?? 1, the condition of the equation (5) is satisfied, where the
sound wave length is ?. (6). xRN) 7- + 2 ........... (5) ? = 1 Jo (u) l иииииииииииииииииииии (6) where JO: firstorder Be5 se1 function 47 cR of zero order, r1 == ?[111 n ░ ░ ░ ░ ░ ░ ░ ░ ░? A few
examples of the relationship of the 0 ░░░░ mode If it is illustrated using all the polar
coordinates, the 2R / ? is 05 ░ 1.2 as shown in FIG. 2, FIG. 5 and FIG. The case is illustrated.
The condition of equation (5) is that the number of microphones ? (it is possible to have
children if they are uniformly distributed on the circumference by the number, but if N is small
and equation (5) is not satisfied) The directivity is broken as shown in FIG. Assuming that the
frequency of the sound is f Hz, the sound wave length ?11-1: (8) ? = T иииииииииииииииииииииииииииииииииии (8)
The speed of sound in the air is V to S Since it is 40 $ ec, f = 1 [100 Hz ? = 34 cm X f = 2000 Hz
? = 47 CIu. At f = 4000 Hz, ? = 13.5 cm. Assuming that 2R = 17 cm is designed in FIG. 1, FIGS.
2, 5 and 4 show directivity to acoustic waves of hf = + 000 Hz, 2000 Hz and 4000 Hz. Further,
since the condition Vi (9) of the equation (5) is obtained, N> ri + 2 2 + 2 ииииииииииииииииии (9) ? ? f =
1000 Hz and N> 3. ??????????????????????????????????
? It is preferable that the microphone group have directivity and the target sound be heard
loudly, as described above, when the hearing ability of the deaf person is not relied upon. When
the directivity is given, the ability to clear the ambient noise is reduced and t ') If the ambient
noise is uniform by using iN microphones, the signal-to-noise ratio or S-ha. The effect that-is
multiplied by -fi is also added.
(F) Embodiment FIG. 6 is a perspective view showing an embodiment of the present invention,
and FIG. 7 is an electrical connection diagram thereof. In the figure, // indicates a rotating disc, /,
J,... N, N indicates N nondirectional micro-holes arranged at equal intervals concentrically with
the center 0 of the rotating disc //. The / / / 2 is a support table, so that it can be rotated about
the rotating disc / / / ol. 73 arrow, / 4t handset, /! An amplifier. Microphone /,, 2. When the
delay amount n ии N is set to ? = O in the equation (4) as in FIG. If you draw an arrow / 3 in the O
? / direction on the rotating disk with a hand and put it, it is completely shown that the sound
wave from the arrow / 3 direction is most greatly felt. In the electrical connection diagram of FIG.
7, when the switch S is turned on as indicated by the full dotted line, the output of each
microphone is not delayed and amplifier /! It is amplified and reaches the receiver t4t. Therefore,
all surrounding sounds can be caught equally. Thus, in this case, the microphone group works
equally on the sound from four directions, which is the same as when listening with one
nondirectional microphone. Then, when it is desired to hear a specific sound out of various kinds
of noises to be heard, the switch s'6 is placed on the solid line side, and each micro // delay
device 2 /, Z2. ... sound from the arrow / three directions in FIG Te shown giving delay ik so
heard largely by 3-Bruno. Therefore, by rotating the rotating disk // by 560 ░, there is a place
where the target sound can be heard in large, so it is possible to stop in that direction and listen
to the specific sound completely clearly. When the apparatus of FIG. 6 is placed on a desk at a
meeting, etc., when it is desired to specifically hear the sound of a specific person, the rotating
disc / so that the arrow / 3 points in the direction of the person It suffices to rotate f. The above
is convenient in the case where the apparatus shown in FIG. FIG. 8 shows an embodiment in
which the microphone group is mounted on, for example, a beret or the like, and the phasing
direction is always in the front direction. The electrical connection may be as shown in FIG. 7. In
this case, the switch sl is connected to the solid line side, and the purpose can be achieved if the
interlocutors are fully directed. In FIG. 8, 7 ? is a microphone support ring, and in FIG.
иииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии With the microphone group as indicated by N. FIG. 9
shows another embodiment of the present invention. FIG. 9 is an electrical connection diagram,
and in the cases where it is troublesome to rotate the rotating disk // total rotation in FIG. 6 and
FIG. It is convenient. In the figure / 12. ... n ... N, / tag and S are the same as in FIG.
In the l direction in the ? direction, an electric output related to the rotation angle ? can be
taken out by, for example, a variable resistor. U, V, J and J are delay devices including a
calculator, and the delay amount is the amount shown by equation (4). Data of rotation angle ?
obtained from ? direction indicator / l? Each Z. If it is supplied to J, 1 and 2 and the total Wk of
equation (4) is performed in each delay device, it means that the microphones are phased in the
? direction, and the sound wave output from that direction becomes maximum. (G) Effects of the
Invention As described above in detail with reference to the drawings, it is possible to provide an
effective hearing aid for a person with a hearing loss who is inferior in the ear-ear effect ability
and the selective listening ability.
Brief description of the drawings
FIG. 1 is a view for explaining the present invention in detail, FIG. 2 to FIG. 5 show directivity,
FIG. 6 is a perspective view showing an embodiment of the present invention, and FIG. FIG. 8 is a
perspective view showing a specific embodiment, and FIG. 9 is another embodiment of the
present invention?
It is a connection diagram shown. / / 2-N ... Microphone, / 4t ... ... Receiver, yx ... Delay ..., 3-X ...
Delay with calculator, S ииииииswitch. Patent applicant International Technology Development Co.,
Ltd. 7.2~N иииии microphone Fang B ?? 2 Figure 2R2R- = 0.5 ? = i? ?> Sakikai pike S surface R
? = 2? // и rotation circle Board / 2 / Support stand / 3 / / Arrow / G / Handset / ~ N /
Microphone / G / и Handset /! иииии Amplifier 1/2 to J иии Delay device S иии Switch; +78 Figure / g ииииии
Receiver 7 ? иии Support ring / 7 иии Microphone group / ~ N и и и Microphone / Z и handset /! и
Amplifier / ?-и и ? direction indicator J ~ X и и и delay device
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