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DESCRIPTION JPH0472899

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DESCRIPTION JPH0472899
[0001]
TECHNICAL FIELD The present invention relates to the improvement of the performance of
loudspeaker systems at low frequencies, and is characterized in particular by the improved
performance in the low frequency range with a structure which is relatively easy and inexpensive
to manufacture The invention relates to an improved loudspeaker system. BACKGROUND OF THE
INVENTION The main problem in manufacturing loudspeaker systems for low frequency
reproduction is to obtain high power at low frequencies while limiting the amplitude of
movement of the loudspeaker cone 3, typical In fact, the loudspeaker topology is configured such
that the acoustic output is such that the distortion of the ear does not occur within the
comparison (the displacement amplitude of the cone is properly within the displacement limits of
the driven structure) . The size of the displacement area is rashito. It must be sufficiently limited
not to increase the manufacturing cost of the speaker. A number of prior art low frequency
speaker systems 11, such as television and radio sets and some loudspeakers, include an
enclosure-less woofer in an enclosure. The problem with these systems is that there is no way to
prevent sound emission from behind the speaker from canceling out the sound emission from the
front. In such systems, peak acoustic output or limited by very large cone motion amplitude
requirements at low frequencies. One prior art attempt to reduce the sound emission Q, j and the
cone motion amplitude behind the sound driver is to place the loudspeaker driver in a closed
box, often with an acoustic 5uspension cysteno, It is to form what is called. The acoustic
suspension system provides the loudspeaker driver resistance, the perfect reactance, to limit the
cone's motion amplitude, as well as the convexity of h9 from the back of the loudspeaker. Let the
radiation cancel out the radiation from the front. An embodiment such as 3 is an embodiment
without a 1's cloakier, 'ratio + i <L, -C low frequency output is increased, but low frequency high'
output Ij is still I-1, so that the movement of the driver 16 construction Amplitude 1-μ range) 7 'j
引') 1lill l ', Ii! I'm sorry. One prior art improvement in the economy-sink system is the boat-
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mounted enclosure system. Typically, the boat is installed (the system includes a woofer in the
enclosure and a port tube acting as a passive (passive) radiation means).
Additional acoustic mass is added to this port tube to create air acactance, which the system
designer uses to tune the loudspeaker response and change the frequency response typically at
the low frequency end I can feel cool. A system with a boat is characterized by a resonant
frequency at which the mass of air in the boat interacts with the volume of air in the cabinet to
produce resonance (boat resonance). During boat resonance, the cone motion amplitude of the
loudspeaker is minimized. The Boat E 1 system has an improved sensitivity at B o 1-resonance
and a reduced cone-accompanying amplitude earlier, 3 by reducing the cone motion motion
water to a frequency near the boat resonance (= I Low-frequency peak power increases and
distortion decreases when compared with acoustic “no-suspension systems”, 3 sensitivity to
boat resonance or improved results often result in low cutoff frequency of the loudspeaker Will
extend to relatively low values. Dual chamber systems have also been used to improve the
performance of acoustic suspension systems. Such a system is disclosed in U.S. Pat. No.
4,549.63+, assigned to the same assignee as the present application. The triple chamber system
has an enclosure divided into first and second sub-chambers by a dividing section H. The dividing
member is formed with an open end including a loudspeaker, wherein one side of the
loudspeaker cone faces the first sub-chamber and the other side of the loudspeaker cone is the
second sub-chamber It is positioned to face. In some triple chamber systems, the first and second
boats directly couple the box 1 and the second subchamber to the area outside the enclosure. In
a curved system, a relatively large subchamber is directly coupled to the area outside the
enclosure, and a relatively small subchamber is coupled to the area outside the enclosure via the
relatively large subchamber. In a dual chamber system, the sub-chambers are connected to each
other or to the area outside the enclosure by either a boat or an equivalent drone cone. This
results in a further increase in low frequency sensitivity and peak power as compared to a
simpler boat mounted enclosure system. SUMMARY OF THE INVENTION It is an important "one
aspect of the present invention to provide an improved triple chamber ported loudspeaker
system.
According to the invention, enclosure means are provided which carry at least one loudspeaker
driver means for converting electrical energy into acoustic energy. A dividing means is provided
for dividing the enclosure means into at least first and second sub-chambers each having a
relatively small volume and a relatively large volume. Preferably, the dividing means comprises
means for supporting the loudspeaker driver means and cooperating therewith to separate the
first and second sub-chambers. At least first and second boat means for producing first and
second acoustic masses are present in said first and second subchambers, respectively. The first
boat means couples the first sub-chamber directly with the area outside the enclosure, and the
second boat means couples the second sub-chamber to the first sub-chamber. The present
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invention emits non-critical acoustic energy spectral components of frequencies above the
predetermined bass frequency, preferably not higher than 300 I-1z, and the many features,
objects and advantages of the inventive song are: It will be clear from the following description in
conjunction with the attached drawings. EXAMPLE Referring now to the drawings, and in
particular to FIG. 1, a schematic diagram of a prior art loudspeaker system having an enclosure
10 of rectangular cross section divided into two sub-chambers 12.14 by a dividing member 16 is
shown. It is shown. The dividing member 16 is formed with an opening 18 which directs the
chamber 12 to the front of the cone of the loudspeaker driver 20. The back of the driver 20 faces
the subchamber 14. The port tube 22 couples the interior of the subchamber 14 to the area
outside the enclosure 10. The port tube 24 couples the inside of the subchamber 12 to the area
outside the enclosure 1 () via the subchamber 14. Subchamber I2 has a substantially smaller
volume than subchamber 14. In FIG. 1B, cone displacement (gating amplitude) and power as a
function of frequency in the prior art system shown in FIG. 1A. A graphical representation of the
power is shown. The output curve shows that the prior art system has a resonance that is 5 rJI3
higher than the response in the rest of the pass band. In FIG. 2 delta 13 is shown a schematic
view of an embodiment of the invention comprising an enclosure group of rectangular cross
section divided into two sub-chambers 12 and 14 by a dividing part collar 16 An opening 118 is
formed which points the chamber 12 to the front of the cone of the loudspeaker driver 2 ().
The back of the driver 20 is directed to the subchamber 14. The port tube 22 couples the interior
of the leave chamber 12 to the area outside the enclosure + -10. The port tube 24 couples the
interior of the subchamber 14 to the area outside the enclosure 10 via the subchamber 12. In
FIG. 28, there is shown a graphical representation of cone displacement (motion amplitude) as a
function of frequency in the embodiment of the invention shown in FIG. 2A. The output power
curve shows a smooth response across the passband without producing the resonance found in
prior art systems. The preferred embodiment of the present invention uses the following
parameters and parameters for various elements: 1 °, ie, magnetic flux density in magnetic gap
of magnetic coil of resistance -4 ohm drive structure of voice coil × magnetic gap Wire length87 Weber / m cone 10 voice coil mass (-moving mass) 0.02 kg driver (woofer-) free air
resonance frequency = 0 flz cone area-0,026 nr (about 20 cm (8 inches) diameter know-how) Small sub-chamber volume WlO, 0063m (about 380 jn 2) large sub-chamber volume-0, 022 2 m
(about 1370 small sub-chamber boat acoustic mass (bonded to the outside of the box)-70 k +; /
m '(about area 0 () 06n (x 0.3 m in length) 1 'b' f-+ -7 h of the boat H, '', ',!? Quality t7t = 80 kg /
m '(approx. Area [1, (6) nr x length 0.35 m) Many modifications can be made within the
principles of the invention. For example, the driver may be coupled to another additional
subchamber 3, the Paranob Lagetta is a boat chicobe as shown in FIG. 2A, a “Dron cone” 22 ′
as shown in FIG. 2/1 or パ ラ can be implemented by paranobe-lageta means of the song ++ 'i'
woofers have multiple transformers to achieve the required total area, driving force and / or
power handling capacity It can also be replaced by a user. Although we have described means
and techniques for providing a flatter output response of the loudspeaker in the bass region,
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many variations and modifications of the song from the specific means and techniques disclosed
may be made without departing from the inventive concept It will be apparent to those skilled in
the art that it is 111 capable. 4, 1j 'j of the drawing DESCRIPTION FIG. 1A is a schematic diagram
showing a prior art loudspeaker system, FIG. 1-13 is a graph showing the power output and cone
motion amplitude of the system of FIG. 1Δ, FIG. 2A is an implementation of the invention FIG. 2B
is a schematic diagram illustrating the power output and cone motion amplitude of the system of
FIG. 2A, and FIG. 3 is a schematic diagram illustrating another embodiment of the invention
including a drone cone. .
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