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JPS52102020

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DESCRIPTION JPS52102020
Loudspeaker system A woofer that receives low frequencies is installed on the front baffle of a
relatively large enclosure, and a tweeter that receives high frequencies is installed at another
location, either on or in the enclosure. A speaker system characterized in that a relatively small
enclosure is installed and a plurality of honey-drain dissby forces which receive a mid frequency
in a diagonal direction according to the front of the buckle are installed.
Claims
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of
arranging Kel speaker units in a stereo speaker system. Conventionally, there are many ways of
arranging the speaker units mounted on the baffle surface of the stereo speaker system, but the
arrangement method of the present invention, which is configured to obtain wide directivity and
sharp and stable sound image localization, is unique. The present invention is a front baffle of a
woofer and tweeter t-1 relatively large enclosures, and the tweeter is mounted on a camowoofer
to form an enclosure including a front buckle surface, and a polyhedron of the top of the
enclosure. A relatively small enclosure is installed and at least two Mitsudrain dissipative forces
(hereinafter referred to as "Mitsudo Range"). ) Is installed in the diagonal direction. The present
invention will be described in detail by way of examples. FIG. 1 is a front view of the stereo
speaker system of the present invention. Woofer 3 and tweeter 4 are installed on the front
buckle of relatively large enclosure 1. A relatively small polyhedron enclosure is installed above
the enclosure 1. Midranges 5 and 6 are installed obliquely. The small enclosure 2 has a
triangular shape as shown in FIG. 2 when viewed from the top, and by installing the microphones
5 and 6 diagonally to each other, a large distraction is obtained to obtain indirect noise at the
listening position. It is intended to enhance. As apparent from FIG. 1, the tweeter 4 is disposed
midway between the mid drain EndPage: 15.6 and the tweeter 3. Such an arrangement method is
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effective in obtaining stable sound image localization. This effect will be described below with
reference to FIG. FIG. 3 is a view showing how to listen to the sound wave emitted from the 3way speaker system. This system is from the bottom of the enclosure 7 woofer-8, Mitsudray Fuji
9. The order of the tweeter 10 is an array [-. Now, assuming that the frequency component of the
signal mainly corresponds to the drive frequency range of the woofer -8 and the midget 9, the
wavefront formed by the woofer and midget is as shown by 11. If the listening position is at the
axial position 13 of the middridge, the direction of the sound image formed by the woofer and
middling seen from the 130 position is 12. On the other hand, if the frequency component of the
signal mainly corresponds to the drive frequency range of the midget 9 and the tweeter 10, the
wavefront formed by the midget and tweeter is as shown by 14.
In this case, the wavefront formed by the midget and tweeter viewed from the position of 13 is as
shown by 15. The direction 12 of the sound image in FIG. 3 (5) and the direction 15 of the sound
image in FIG. 3B are different from each other, and the sound image moves up and down
depending on the frequency component of the signal. Although the above description was for the
monophonic case, vertical movement of the sound image in the two channel stereo will be
described with reference to FIG. It is assumed that two of the three-way speaker systems are
arranged, and a sound image is formed substantially in the center of the two speaker systems.
When the frequency component of the signal corresponds to the drive frequency range of the
woofer and mid-drainage, the sound image seen from the listening position is a. On the other
hand, when the frequency component of the signal corresponds to the drive frequency range of
the midget and tweeter, the sound image viewed from the listening position moves upward and is
localized as shown by b. As described above, when the woofer, mid drainer and tweeter are
sequentially arranged, the sound image does not move up and down due to the frequency
component of the signal, and this effect becomes more remarkable as the distance between the
speaker units increases. become. In addition, even when two speaker units are installed laterally
apart on the baffle surface, the sound image is enlarged or shrunk depending on the frequency
component of the signal source. This phenomenon will be described with reference to FIG. The
loudspeaker system of the present invention has two mid-ranges installed diagonally to each
other in order to improve the sound quality by increasing the mid-frequency dispersion and
increasing the indirect sound at the listening position . When this mid drain is arranged in a
stereo arrangement t as shown in FIG. 5, the sound image formed by the four mid drains viewed
from the listening position will be described below. Midranges 16 and 17 are installed diagonally
in one enclosure to emit the sound waves of the left channel signal. Midranges 18, 19 are also
installed diagonally in one enclosure and emit sound waves of the right channel signal. When a
signal localized in the front direction at the listening point 24 is input to the left and right
speaker systems, a sound image C is generated by the sound waves 20 and 21 of the midranges
16 and 18 and the sound waves 22 of the midways 17 and 19 and 23 forms a sound image d.
The sound images C and d are formed apart as shown in the figure, and this phenomenon is more
remarkable as the mid drains 16 and 17 and 18 and 19 are separated.
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The sound image formed by the midgets 17 and 18 and 16 and 19 is formed in the middle of the
sound images C and d, so that the sound image formed by this stereo system is eventually spread
like e. In order to prevent the spread of the sound image, there is no way other than placing the
mid drains 16 and 17 and 18 and 19 close to each other. In the speaker system of the present
invention, a small enclosure in which only the drainage is installed is installed on a rectangular
parallelepiped enclosure in order to install the two drainages in close proximity to each other.
Next, in the speaker system according to the present invention, a method of configuring
characteristics of each speaker unit will be described with reference to FIG. The construction
method EndPage: 2 on the characteristic of this system is performed paying attention to the
power response of each speaker unit. In FIG. 6, the woofer power response 25 and the tweeter
power response 26 are joined at the crossover frequency g. The characteristics of the crossover
network are adjusted such that the crossover frequency g is 2 KHz. On the other hand, the two
mid drains are driven in the range of about 800 Hz to about 4 KHz (a reduction range of 3 dB),
and their power responses have 27 characteristics in the figure. The power response synthesized
by the woofer-92 midrange and tweeter, for example the power response in the front half space
of the loudspeaker system, is flat with a deviation of ± 1 dB in the range 100 Hz to 5 KHz. With
respect to the above embodiment, a speaker system as shown in FIG. 7 in which at least two
speaker units in both the tweeter and the midrange are disposed in an oblique direction can be
configured according to the gist of the present invention. In the figure, small polyhedron
enclosures 29 and 30 are installed on the rectangular enclosure 28. Woofers 31 are installed in
the enclosure 28, tweeters 32 and 33 are installed in the small enclosure 29, and midranges 34
and 35 are installed in the small enclosure 30. In summary of the present invention described
above, according to the present invention, when a plurality of high frequency range speakers
(one or both of the midrange and the tweeter) are arranged in at least two diagonal directions in
order to obtain wide directivity. In order to find out and solve the new problem to be solved that
the sound image spreads, it is necessary to pass through the sound source central axis of the
woofer, on the straight line perpendicular to the horizontal plane on which the speaker box is
placed, It was born based on the idea that the sound sources of the high frequency range
loudspeakers should be as close as possible.
An embodiment of the present invention made on the basis of this basic idea is the embodiment
shown in FIGS. 1, 2 and 7. That is, when a plurality of high frequency speakers are provided in an
oblique direction, it is considered advantageous to provide these speakers on the outer surface of
the speaker box in relation to the normal price etc. In order to solve the above problems. A
relatively small polyhedron enclosure is provided in the enclosure of the speaker box or above or
below the speaker box, and these high-range speakers are arranged. なお。 The high-frequency
speaker and the sound reflector may be arranged so that the sound source of the high-frequency
speaker gathers on the vertical straight line using a sound reflector.
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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front view of the speaker system of the
present invention. FIG. 2 is a top view of the speaker system of the present invention. Figure 3 is
by the frequency component of the input signal to the speaker system. It is a figure explaining
that the formation direction of the sound image seen from the listening position changes to an
up-down direction. FIG. 4 is a view for explaining that in the case of the Fi 2 channel stereo, it
changes in the up and down direction depending on the localization direction ice of the sound
image seen from the listening position and the frequency component of the input signal. FIG. 5 is
a view showing a state of sound image localization formed by four speaker units in the case of
using a speaker system constituted by two midranges in a two-channel stereo. FIG. 6 shows the
characteristic configuration method of the speaker system of the present invention, and is a view
showing the characteristic of the power response of each speaker unit. FIG. 7 is a view showing
another speaker system configuration method which makes use of the subject matter of the
present invention. -End page: 311 一 ri 2ri 5 · 31 T T 肩 5 肩 4 葛 6 笛 7 100 EndPage: 4 First
page continued 0 inventor 冨 廣 川 白鳥 白鳥 白鳥No. 5 5 Hitachi, Ltd. Toyokawa Plant inside
Toyokawa Plant Yoshihiko Doshihara Toyokawa City No. 9 in front of Shirakawa-cho No. 5 Co.
Ltd. Hitachi Co., Ltd. Toyokawa Plant procedure correction document 1, display of the case
Showa 5 / year patent application No. 179! No. 2, invention speaker system 2, invention speaker
system 3, persons who make corrections Patent applicant address Chiyoda-ku, Tokyo
Marunouchi in Chiyoda-ku, Tokyo-5th item name (510) Hitachi, Ltd. 4 · Post agent 〒 211 °,
number of inventions increased by correction. 7. Target specification of correction and drawing
8, contents of correction attached as a separate sheet Full text of specification and correction
specification Name of speaker system Speaker system of name of speaker system Speaker system
Claims
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a loudspeaker
system in which the amplitude frequency response characteristic is substantially flat and the
power frequency characteristic in a predetermined solid angle space is also nearly flat. Here, in
order to simplify the description, the description will be made by taking a conventional two-way
speaker as an example. Conventionally, as shown in FIG. 8 (A), the 2-way speaker is composed of
a woofer 3 which is a low range speaker and a tweeter 4 which is a high sound speaker provided
in the enclosure l. Here, the central axis of the sound wave emitted from each speaker is directed
in the front direction. また、ウーハ3. The amplitude frequency response characteristics of and
tweeter 4 are as shown by curves 101 and 102 in FIG. 8 (B), and curve 10! And (2) EndPage:
51102 normally intersects at a point 3 dB lower (crossover frequency, wave number f).
Therefore, the amplitude frequency response characteristic synthesized by both the speakers 3
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and 4 becomes substantially flat as shown by a curve 100 at a position away from the speaker
box by a predetermined distance in front of the front. However, in this speaker system, the power
frequency response characteristic at one point in the front direction is flat as shown by curve
103 in FIG. 8C, but for example, a solid angle with respect to the front direction of the speaker
system When the power frequency response characteristic in the subspace of the yoke 80 'is
measured, a drop can be made at the crossover frequency f as shown by a curve 104. The reason
why this occurs is that the woofer and tweeter create a particularly strong interference sound
field near the crossover frequency, and the directivity in the vertical direction becomes sharper
than that in the horizontal direction near this frequency, and the power in the vertical direction is
horizontal This is because the power of the direction is insufficient. This gives a particularly
unpleasant hearing result when it is necessary to audition in a narrow room (when the power
frequency response characteristic has a large effect on the reproduced sound field). The present
invention has been made to solve the above-mentioned drawbacks of the prior art, and provides a
speaker system that compensates for the drop without affecting the amplitude frequency
response characteristic as much as possible. In order to achieve this object, according to the
present invention, a midrange speaker (hereinafter referred to as a "mid-range") configured to
include the crossover frequency of both speakers in the drive frequency range, that is, an
amplitude frequency response characteristic is the ninth. A middle range as shown by curve 105
in the figure is provided such that its central axis is directed obliquely to the front.
Also, in order to obtain clear sound image localization, the woofer, the microphone range and the
tweeter are arranged as shown in the following embodiments.
Claims
Hereinafter, the present invention will be described in detail. FIG. 1 is a front view of a stereo
speaker system according to an embodiment of the present invention, in which a woofer 3 and a
tweeter 4 are installed on the front baffle of a relatively large enclosure 1. A relatively small
polyhedron enclosure 2 is installed on the enclosure 1, and the microwave ovens 5 and 6 are
installed obliquely outward. The small enclosure 2 has a triangular shape as shown in FIG. 2
when viewed from above, and by installing the microphone ranges 5 and 6 obliquely to each
other, a large-sized penetration is obtained, and a listening position is obtained. It is intended to
enhance the indirect sound in First, in the speaker system according to the present invention, the
method of configuring the characteristics of each speaker unit will be described with reference to
FIG. The characteristic configuration method of this system focuses on the power response of
each speaker unit. In FIG. 6, the power response curve 25 to the wheel and the power response
curve 26 of the tweeter are joined by the crossover frequency g. Here, the characteristics of the
crossover network are adjusted (5) such that the crossover frequency g is 2 kHz. On the other
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hand, both of the two middranges operate in the range of about aoo Hz to about 4 kHz (a
reduction range of 3 dB), and the power response characteristic thereof is a curve 27. With this
configuration, sound pressure frequency characteristics on the front axis of the speaker system
and power response characteristics in a half space or the entire space in the front direction can
be made flat within a range of 100 H 2 to 5 kHz within ± 1 dB deviation. In addition, by
installing the mutually extending ranges obliquely to each other, it is possible to obtain a wide
sound field feeling with a lateral spread. Further, as is apparent from FIG. 1, the tweeter 4 is
disposed between the midranges 5, 6 and the tweeter 3. Such an arrangement method has a
great effect in obtaining stable sound image localization. Hereinafter, this effect will be described
with reference to FIG. FIG. 3 illustrates listening to the sound waves emitted from the ウ ェ イ way speaker system, which comprises: ミツド(6)EndPage:6レンジ9. It is
arranged in the order of the tweeter 10. Now, assuming that the frequency component of the
input signal mainly corresponds to the drive frequency range of the woofer 8 and the midrange
9, the wavefront formed by the woofer 8 and the midrange 9 is as shown by 11.
Assuming that the listening position is the on-axis position 13 of the midrange 9, the direction of
the sound image formed by the woofer and the midrange viewed from the position 13 is 12. On
the other hand, assuming that the frequency component of the input signal mainly corresponds
to the drive frequency range of the Mitsudo range 9 and the tweeter 10, the wavefront formed by
the Mitsudo range and the tweeter is as shown by 14. In this case, the direction of the sound
image formed by the midd range and the tweeter viewed from the position 13 is as shown by 15.
The direction 12 of the sound image in FIG. 3 (A) and the “direction 15 of the sound image in
FIG. 3 (B) are different from each other, and the sound image moves vertically by the frequency
component of the input signal. Although the above description is for the monophonic case,
vertical movement of the sound image in the two-channel stereo system will be described next
with reference to FIG. In the figure, it is assumed that two of the three-way speaker systems are
disposed, and a sound image is formed in substantially the center of the two speaker systems.
Here, when the frequency component of the input signal corresponds to the drive frequency
range of the woofer and the midrange, a sound image seen from the listening position is assumed
to be a. On the other hand, when the frequency component of the signal corresponds to the drive
range of the midrange and tweeter, the sound image viewed from the listening position moves
upward and is localized as b. Thus, when the woofer, the midrange and the tweeter are
sequentially arranged in the vertical direction, the sound image is moved in the vertical direction
by the frequency component of the signal, and this effect becomes more remarkable as the
distance between the speakers increases . In addition, even when two speakers are placed
laterally apart on the baffle surface, the sound image may expand or contract depending on the
frequency component of the signal source. This phenomenon will be described with reference to
FIG. The speaker system according to the present invention has two midranges installed outward
in the diagonal direction, in order to improve the sound quality by increasing the dispersion of
the mid frequency and increasing the indirect sound at the listening position. There is. In the
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following, when the two mitsudo ranges are arranged on the left and right as shown in FIG. 5 so
as to obtain a wide sound field, the sound image formed by the four mitsudoranges 16 to 19
viewed from the listening position Will be explained. A half range 16.1'7 is installed diagonally to
each other in one enclosure and emits the sound wave of the left channel signal. Also, the
microphones 18.19 are installed diagonally in the same enclosure and emit the sound waves of
the right channel signal.
In this way, when a signal that causes the sound image to be originally localized at the center
position of the front at the listening point 24 is input to the left and right speaker systems, the
sound image C is generated by the sound waves 20 and 21 of each A sound image d is formed by
the sound waves 22 and 23 of the Mitsudorange 17 and 19, respectively. The sound images C
and d are formed apart from each other as shown in the figure, and this phenomenon is more
remarkable as the mi (9) studles 6 and 17 and 18 and 19 are separated. On the other hand, a
sound image formed by the halfranges 17 and 18 and 16 and 19 is formed between the sound
images C and d. Therefore, the sound image formed by this stereo system is spread as shown by
e. In order to prevent the spread of the sound image, it is necessary to set the proximity ranges
16 and 17 and 18 and 19 close to each other. In the speaker system of the present invention,
since the two midranges are disposed close to each other, if the midranges are provided on each
side of the enclosure as in the prior art, the mutual spacing between the midranges will inevitably
be wide. In the present invention, in order to prevent this, the small enclosure in which only the
stove is attached is installed above the rectangular enclosure. Furthermore, as shown in FIG. 7, a
speaker system in which at least two speakers in both the tweeter and the midrange are installed
in an oblique direction to each other can be configured according to the main (lO) EndPage: 7
effect of the present invention. In the figure, the small polyhedron enclosures 2a and 2b are
installed on a rectangular enclosure l, the woofer 3 in the enclosure 1, the tweeters 4a and 4b in
the small enclosure 2a, and the movable ranges 5 and 6 in the small enclosure 2b. is set up.
Summarizing the present invention described above, the present invention was born based on the
following idea. That is, the sound image may be spread only by arranging a plurality of at least
two high-range speakers (either one or both of the midst range and the tweeter) outward and
obliquely in order to obtain wide directivity. , Create new problems to be solved. In order to solve
this, at least one point of the sound source central axis of the woofer intersects at least one point,
and the sound sources of the plurality of high-range speakers are as close as possible to one
point on a straight line perpendicular to the horizontal plane on which the enclosure is placed. I
have to let it go. An embodiment of the present invention made on the basis of this basic idea is
as shown in FIGS. 1, 2 and 7.
That is, when a plurality of high frequency speakers are provided in an oblique direction, it has
conventionally been considered advantageous to provide these speakers on the outer surface of
the enclosure in terms of price and the like. On the other hand, the present invention recognizes
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that the price is increased to solve the above problems, and a relatively small polyhedron
enclosure is provided in the enclosure or in the enclosure or at the lower side of the enclosure. It
is characterized in that a speaker is arranged. It is also possible to use a sound wave reflection
plate and arrange so that the sound wave of the high-frequency speaker is emitted to one point
on the above-mentioned vertical straight line. As described above in detail, according to the
present invention, a clear sound image position can be obtained when a drop range of the
amplitude frequency response characteristic is compensated by providing a middle range, and
the effect is large.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front view showing an embodiment of the
speaker system according to the present invention, and FIG. 2 is a plan view of the same, and FIG.
3 is from the listening position according to the frequency component of the input signal to the
speaker system. An explanatory view showing a state in which the sound image direction
changes up and down, FIG. 4 is an explanatory view showing a state in which the localization
direction of the sound image from the listening position in the two channel stereo changes up
and down according to a frequency component of the input signal, and FIG. FIG. 6 is an
explanatory view showing a state of sound image localization by four speakers in a case where a
speaker system composed of two midranges is changed to a two-channel stereo, FIG. 6 is a power
response characteristic diagram of each speaker according to the configuration of the present
invention, FIG. 7 is a plan view and a front view showing the configuration of another
embodiment of the present invention, and FIG. 8 (A) is a perspective view showing the
configuration of a conventional two-way speaker system, and FIG. (C) is also amplitude and
power frequency characteristic diagram, FIG. 9 is an amplitude-frequency characteristic diagram
of the present invention. 1.2,2a、2b:エンクロージャ、3:ウーハ、4、”4.a、
4b:ツイータ、5,6:ミツドレンジ。 (13) Fangs! ; Fig. Γ Fig. EndPage: 8 to 8 磯-■ 2 years
old "" / cutting → EndPage: 9
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