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JP2000050383

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DESCRIPTION JP2000050383
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
directional speaker device used as a means for compensating for the hearing loss of a deaf
person accompanying aging such as the elderly.
[0002]
2. Description of the Related Art It is generally difficult for people with hearing loss with age to
hear especially the mid-range sound, and television broadcasts and the like are viewed with the
volume raised.
[0003]
[0003] From the above, when watching television broadcasting etc. with other family members
who are hearing listeners and watching them, the volume becomes too loud for the hearing
listeners when it is matched with the deaf person The volume matched to the hearing person is
difficult for the deaf person to hear, and when the headphone or the earphone is used by the
earphone jack whose speaker is not turned off, it is troublesome when moving.
[0004]
SUMMARY OF THE INVENTION In order to solve the above problems, a speaker device according
to the present invention comprises a first high pass filter having a first cutoff frequency to which
an input signal at least in an audible band is input. An output of the first high-pass filter is
inputted, and a low-pass filter set to an arbitrary second cutoff frequency higher than the first
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cutoff frequency by the high-pass side adjustment means; A plurality of loudspeaker units
arranged in the horizontal direction to which an output is inputted, and a signal of approximately
1 kHz or more, in which the hearing sensitivity of an age-type deaf person is lowered, is detected
by the first high pass filter In addition to amplification, horizontal directivity is narrowed by
arranging the plurality of speaker units in the horizontal direction, and By adjusting the cutoff
frequency in accordance with the preference of hearing loss and sound are those that can
provide a speaker device capable of adjusting the frequency characteristic.
[0005]
BEST MODE FOR CARRYING OUT THE INVENTION According to the first aspect of the present
invention, there is provided a first high-pass filter having a first cutoff frequency to which an
input signal in at least an audible band is input, And an output of the low-pass filter, and an
output of the low-pass filter set by the high-pass side adjustment means to an arbitrary second
cut-off frequency higher than the first cut-off frequency. And the first high-pass filter detects and
amplifies a signal of approximately 1 kHz or more, in which the hearing sensitivity of an age-type
deaf person is lowered. By arranging the plurality of speaker units in the horizontal direction, the
directivity in the horizontal direction is narrowed, and the cutoff frequency of the low pass filter
is By sections are those which can provide superior speaker device capable of adjusting the
frequency characteristics in accordance with the preference of hearing loss and sound.
[0006]
According to a second aspect of the present invention, the first high-pass filter according to the
first aspect is provided with low-pass side adjustment means for arbitrarily adjusting the first
cutoff frequency. The lower limit (low frequency side) of the frequency band of the reproduced
sound can be adjusted in accordance with the state of hearing loss and the preference of the
sound.
[0007]
According to a third aspect of the present invention, there is provided a low band side adjustment
means which is formed of at least a second order or higher order filter lower than at least a first
high pass filter and which adjusts a cutoff frequency arbitrarily. The second high-pass filter
provided is inserted between the first high-pass filter and the low-pass filter, and, like the
invention according to claim 2, the reproduced sound is adapted to the individual's hearing loss
situation and preference of sound. It is possible to adjust the lower limit (lower band side) of the
frequency band of
[0008]
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Hereinafter, an embodiment of a speaker device according to the present invention will be
described with reference to FIGS. 1 to 7. FIG.
[0009]
Embodiment 1 FIG. 1 is an external perspective view of an embodiment of a speaker device
according to the present invention, FIG. 2 is a circuit block diagram thereof, and FIG. 3 is a
frequency characteristic diagram.
According to the figure, 1a to 1h are speaker units arranged in the horizontal direction, 2 is a
first high pass filter, 3 is a low pass filter, 4 is a power amplifier, 5 is a high band adjustment
means of the low pass filter 3, 6 is a An external signal input means, f 1 c is a first cutoff
frequency of the first high pass filter 2, and f 2 c, f 2 l and f 2 h are second cutoff frequencies of
the low pass filter 3.
[0010]
Next, the detailed configuration of the above-described embodiment will be described together
with its operation.
First, an external signal is input from the input means 6 to the first high pass filter 2, and only
the middle high band signal of approximately 1 kHz or more is passed by the first high pass filter
2, and the high band side is attenuated by the low pass filter 3, A band component between the
first cutoff frequency f1c of the first high pass filter 2 and the second cutoff frequency f2c of the
low pass filter 3 is amplified by the power amplifier 4 to drive the speaker units 1a to 1h.
Here, the second cutoff frequency f2c can be adjusted in the range of f21 to f2h by the highfrequency adjustment means 5.
[0011]
When the speaker units 1a to 1h are arranged in the horizontal direction, the directivity in the
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horizontal direction is narrow and the directivity in the vertical direction is wide.
Further, the directivity is controlled from the low frequency side as the entire width of the
arranged speaker units 1a to 1h is larger, and the directivity is higher than the high frequency
side as the arrangement interval of the individual speaker units 1a to 1h is narrower. It becomes
controllable.
[0012]
Therefore, when the reproduction frequency band and directivity control band of the speaker
device according to the present embodiment are set to approximately 1 kHz or more that can be
heard by a deaf person and used in combination with a television receiver, If the speaker device
is directed to the deaf person at the same time when the non-depleted person simultaneously
views, the sound of the middle to high range can be added only to the deaf person, so the volume
of the television receiver is increased You can enjoy television broadcasting without it.
Here, when only a hearing impaired person gives a large volume in the middle to high range
from the speaker device to the volume of the television receiver, the higher the first high pass
filter 2 is, the longer the wavelength and the non-directional It is desirable that the filter be a
second-order or higher order filter because leakage noise to the low-frequency side, which is a
characteristic, is reduced.
[0013]
The hearing ability decreases with age, especially at 1 kHz or more, but when the high frequency
hearing decreases and it takes a long time to add a sound of approximately 1 kHz or more to the
entire audible band, you can hear until now Because the sound of the frequency component that
was not heard is heard suddenly, it may cause discomfort or discomfort, or the taste of the sound
may not match.
Therefore, by adjusting the second cutoff frequency f2c in the range of f21 to f2h, that is,
adjusting the volume on the high frequency side, it can be adjusted to the degree and preference
of the individual's hearing loss.
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Here, when the low-pass filter 3 is a first-order filter, the change width as the adjustment
function, that is, the change range of the sound pressure level in the high region becomes small,
so steep attenuation characteristics are given by the second-order or higher order filter. Is
desirable.
[0014]
In the above embodiment, the number of speaker units 1a to 1h is eight, and they are arranged at
equal intervals in one horizontal row, but an example of the number and arrangement method is
shown, for example They may be arranged in two rows in the horizontal direction, or the
arrangement intervals of the speaker units and the size of the speaker units may be set
arbitrarily.
[0015]
(Embodiment 2) FIG. 4 is a circuit block diagram of another embodiment of the speaker
apparatus of the present invention, and FIG. 5 is a frequency characteristic diagram thereof.
The same parts as in the first embodiment will be assigned the same reference numerals, and the
explanation thereof will be omitted. A low side adjustment means 7 and a first cut-off frequency
f1c, f1l, f1h of the first high pass filter 2 will be described. .
[0016]
Next, the operation of this embodiment will be described. As in the first embodiment, the signal
inputted from the input means 6 passes through the first high pass filter 2 and the low pass filter
3, and is amplified by the power amplifier 4. The second cut-off frequency f2c of the low pass
filter 3 is varied by f2l to f2h by the high band side adjustment means 5, and the volume
adjustment on the high band side is performed. In the embodiment, the first cutoff frequency f1c
of the first high pass filter 2 is made variable by the low range adjustment means 7 in the range
of f1l to f1h in order to provide the adjustment function also on the low range side.
[0017]
Therefore, it is possible to finely adjust according to the hearing loss and preference, and in
particular, when the hearing ability of about 1 kHz or less is lowered, the first cutoff frequency
f1c is adjusted by the low band side adjusting means 7. When the frequency is lowered to f11
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and the sound is heard at approximately 1 kHz or more, the adjustment such as raising the first
cut-off frequency f1c to f1h by the low band adjustment means 7 is effective.
[0018]
Further, by lowering the first cut-off frequency f1c of the first high pass filter 2 to f1l by the low
band adjusting means 7, many low band components which become longer in wavelength are
reproduced and the directivity is on the low band side. Although degraded, the directionality of
the high region that is offensive to the hearing person remains narrow, so the hearing impaired
person and the hearing person can enjoy the combination of the television receiver and the
speaker device at the same time.
[0019]
(Third Embodiment) FIG. 6 is a circuit block diagram of a speaker apparatus according to another
embodiment of the present invention, and FIG. 7 is a frequency characteristic diagram of the
same.
The same parts as in the first embodiment will be assigned the same reference numerals and
explanations thereof will be omitted.
[0020]
According to the drawing, reference numeral 8 denotes a second high pass filter, and f3c, f3l and
f3h denote cutoff frequencies of the second high pass filter 8.
[0021]
Next, the operation of the present embodiment will be described. The signal inputted from the
input means 6 passes through the first high pass filter 2 and enters the second high pass filter 8,
the low pass filter 3, the power amplifier 4. The second cutoff frequency f2c of the low pass filter
3 is varied in the range of f21 to f2h by the high-pass side adjusting means 5 to drive the
speaker units 1a to 1h.
Here, the third cutoff frequency f 3 c of the second high pass filter 8 is set between the first
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cutoff frequency f 1 c of the first high pass filter 2 and the second cutoff frequency f 2 c of the
low pass filter 3. The first high pass filter 2 is set to a higher order than the second high pass
filter 8.
[0022]
Thus, the low pass which obviously degrades the narrow directivity by the first high pass filter 2
is blocked, and the third of the second high pass filter 8 which is lower in order than the first
high pass filter 2 is cut off. If the cutoff frequency f3c of the lower band adjustment means 7 is
varied in the range of f31 to f3h, the adjustment means controls the low-order filter particularly
in the analog circuit as compared with the second embodiment, so that implementation is
facilitated. .
It is preferable that the second high-pass filter 8 be a second-order or higher filter because it is
necessary to adjust the third cut-off frequency f3c in the range of f31 to f3h to ensure a wide
volume change on the low band side.
[0023]
The first to third cut-off frequencies f1c, f2c, f3c by the high band side adjustment means 5 and
the low band side adjustment means 7 of the above-described embodiments may be stepwise
variable, and may be continuous. It is needless to say that it may be variable.
[0024]
As described above, according to the speaker device of the present invention, the first high-pass
filter having the first cutoff frequency and the high-pass side adjusting means can arbitrarily set
the first cutoff frequency higher than the first cutoff frequency. The hearing sensitivity of an
aging-type deaf person by comprising a low-pass filter set to the second cutoff frequency of and
a plurality of horizontal speaker units into which the output of the low-pass filter is input. In
addition to detecting and amplifying the signal of the middle and high range which is lowered by
the above first high pass filter, and adjusting the cutoff frequency of the above low pass filter,
according to the hearing loss and the preference of the hearing impaired person A speaker
device capable of adjusting frequency characteristics can be provided.
[0025]
Brief description of the drawings
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[0026]
1 is an external perspective view of an embodiment of the speaker apparatus of the present
invention
[0027]
Fig. 2 Same circuit block diagram
[0028]
Fig. 3 Same frequency characteristics
[0029]
4 is a circuit block diagram of the other embodiment
[0030]
Fig.5 The same frequency characteristic chart
[0031]
6 is a circuit block diagram of the other embodiment
[0032]
Fig.7 The same frequency characteristic chart
[0033]
Explanation of sign
[0034]
1a to 1h Speaker unit 2 first high pass filter 3 low pass filter 4 power amplifier 5 high band side
adjusting means 6 external signal input means 7 low band side adjusting means 8 second high
pass filter
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